Japan Dental Association

Author(s): Motohiro OTSUKI

Affiliation: DUO Specialists Dental Clinic, Osaka-shi, Osaka

Title: The current state of and future prospects for peri-implant disease

Abstract

Dental implant treatment is widespread, and has been an option in prosthodontic treatment for missing teeth for several decades. However, it is well reported that numerous complications occur in dental implant treatment due to its popularity. Peri-implant disease, in particular, is very prevalent, but does not often cause severe symptoms in patients, meaning appropriate treatment is not provided in many cases. In addition, peri-implantitis that began as peri-implant mucositis can be difficult to treat with a good prognosis.

Keywords: Peri-implant disease, Peri-implant mucositis, Peri-implantitis

Author(s): Miki OJIMA

Affiliation: Department of Oral Health Sciences, Faculty of Nursing and Health Care, BAIKA Women’s University

Title: Effects of tobacco smoking on dental and oral health and recent discussions on smoking cessation intervention

Abstract

Smoking and secondhand smoke increase the risk of dental and oral diseases, and smoking cessation reduces the risk. The level of evidence for the causal relationship is determined based on epidemiological studies. Recent findings that tobacco smoke alters oral bacteria and the microbiome provide a biological basis for explaining the relationship. In recent years, there has been growing concern over the use of new tobacco products. Adverse effects of e-cigarettes on the oral cavity have already been reported in much literature. There is no scientific evidence that heated tobacco products are safe, and their use may interfere with smoking cessation.

Keywords: Tobacco smoking, Smoking cessation intervention, New tobacco products

Author(s): Keiji SHINOZUKA, Morio TONOGI

Affiliation: 1st Department of Oral and Maxillofacial Surgery, Nihon University School of Dentistry

Title: Treating malocclusion with surgery: changes in physiological function caused by maxillary and mandibular movement

Abstract

Orthognathic surgery is a treatment that aims to improve malocclusion and masticatory function. Furthermore, it brings changes to the tongue, soft palate and upper airway. Previous studies have focused on morphological analysis, yet how upper airway morphology and physiological respiratory function change remains unknown. This study explored the following: 1) how maxillofacial skeletal morphology affects the upper airway, 2) the relationship between changes in the air passageway of the pharynx caused by mandibular movement, and nasal airflow, 3) changes in upper airway airflow dynamics using computational fluid dynamics analysis, and 4) the effectiveness of the cuff-leak test in assessing changes in resistance in the upper respiratory tract in patients who received a diagnosis of jaw deformity. These results are effective to determine the magnitude and direction of movement, not only in confirming occlusion and esthetics but also in elucidating pathophysiology.

Keywords: Orthognathic surgery, Upper airway morphology, Physiological respiratory function

Author(s): Ryu SUZUKI

Affiliation: Medical Corporation Hachiryukai Suzuki Dental Clinic, Fukuroi-shi, Shizuoka

Title: Recommendations in the study of dentition: dentition as a barometer of health
-Based on a long-term survey at my clinic-

Abstract

Information on dentition is important for all subspecialities of clinical dentistry. Consideration must be paid to what the ideal dentition should be in prosthodontics, pediatric dentistry, orthodontics, implantology, and other fields. Since I established my own practice, my orthodontic methods have changed considerably. Rather than applying force to move teeth, I have now switched to techniques that correct the underlying causes of malocclusion. Two such causes are extreme maxillofacial hypoplasia and functional causes such as a low tongue rest position during oral respiration. This paper presents the data of 1,267 orthodontic patients treated over a 10-year period, uses case studies to explain treatment methods, and introduces digitalization of dentition.

Keywords: Nasal respiration oral respiration, Molar infraocclusion, Hemifacial hypoplasia

Author(s): Atsuo SAKURAI,
Seikou SHINTANI

Affiliation: Department of Pediatric Dentistry, Tokyo Dental College

Title: Endodontic treatment of deciduous teeth

Abstract

Prior to performing endodontic treatment of a deciduous tooth, it is important to confirm the age of the child, the condition of the tooth root, and the status of successive permanent tooth germs. For these purposes, an intraoral X-ray examination is indispensable, unlike when treating a permanent tooth, when it is optional. Because deciduous tooth roots are different in form from those of permanent teeth and often cause resorption, we should consider these features during treatment. After treatment, it is also important to take X-rays regularly to check if there are any abnormalities in deciduous tooth roots and surrounding tissue until the replacement of teeth.

Keywords: Tooth root, Periapical lesion, Successive permanent tooth

Author(s): Mitsuhiro TSUKIBOSHI

Affiliation: Tsukiboshi Dental Clinic, Ama-gun, Aichi

Title: Relationship between teeth and alveolar bone in terms of transplantation and replantation

Abstract

One-third of facial growth occurs due to the eruption of teeth. Conversely, when a tooth or periodontal ligament is lost, the alveolar bone (jaw ridge) is resorbed and reduced. On the other hand, techniques for regenerating alveolar bone lost due to periodontitis are being actively developed. However, there seems to be no clear answer as to when and how much bone is lost or regenerated. In this paper, the author tries to unravel the mechanism of bone resorption and bone regeneration through clinical cases of transplantation and replantation.

Keywords: Periodontal ligament, Bone resorption, Bone regeneration

Author(s): Norio OHMAGARI

Affiliation: Disease Control and Prevention Center, National Center for Global Health and Medicine Hospital

Title: Countermeasures for antimicrobial resistance (AMR) in dentistry

Abstract

To address the issue of antimicrobial resistance (AMR), an AMR Action Plan has been developed in Japan. A campaign was conducted based on the results of a public knowledge and awareness survey as a way to boost public awareness and education. Surveillance was enhanced through the development of J-SIPHE in the medical field to examine and monitor trends. Regional networks have also been established with the goal of infection prevention and control. To help ensure the appropriate use of antimicrobial agents, the Ministry of Health, Labour and Welfare (MHLW) issued a guide to these agents, and additional medical fees were added to the reimbursement system. In the area of research and development and drug discovery, the development environment for new drugs is being improved. The results of a questionnaire to determine the status of antimicrobial use in dentistry revealed that the use of broad-spectrum antimicrobial agents is high and that antimicrobial agents are not used at the appropriate time. The reasons for this were thought to include insufficient knowledge of the contents of practice guidelines and insufficient scientific antimicrobial usage information in the antimicrobial package inserts. Possible countermeasures include further promotion of education and awareness-raising, and revision of the package inserts for antimicrobial agents with expanded indications using the public knowledge application system.

Keywords: Antimicrobial resistance, AMR, Proper use of antimicrobials

Author(s): Keiso TAKAHASHI

Affiliation: Division of Periodontics, Department of Conservative Dentistry, School of Dentistry, Ohu University

Title: Relearning endodontics: bringing change to unchanging root canal treatment

Abstract

Efficient root canal treatment is difficult with the classical endodontic procedure learned at dental school. There is no increase in the success rate, so time spent on treatment is often time wasted. Many theories pertaining to root canal preparation have been reported; however, undergraduate education is still insufficient. The Ni-Ti rotary system is becoming more widespread as a trend in root canal preparation; yet, it is not a panacea and, furthermore, it is necessary to select indications. Here I reconsider the theory and practice of root canal treatment and present useful hints that make traditionally trying endodontic treatment (“Endless Endo”) less trying and more enjoyable (“Happy Endo”).

Keywords: Fallacies and paradigm shifts in endodontics, Relationship between endodontic disease and occlusal parafunction, Theory of root canal preparation

Author(s): Norio OHMAGARI

Affiliation: Disease Control and Prevention Center, National Center for Global Health and Medicine Hospital

Title: Countermeasures for antimicrobial resistance (AMR) in dentistry

Abstract

To address the issue of antimicrobial resistance (AMR), an AMR Action Plan has been developed in Japan. A campaign was conducted based on the results of a public knowledge and awareness survey as a way to boost public awareness and education. Surveillance was enhanced through the development of J-SIPHE in the medical field to examine and monitor trends. Regional networks have also been established with the goal of infection prevention and control. To help ensure the appropriate use of antimicrobial agents, the Ministry of Health, Labour and Welfare (MHLW) issued a guide to these agents, and additional medical fees were added to the reimbursement system. In the area of research and development and drug discovery, the development environment for new drugs is being improved. The results of a questionnaire to determine the status of antimicrobial use in dentistry revealed that the use of broad-spectrum antimicrobial agents is high and that antimicrobial agents are not used at the appropriate time. The reasons for this were thought to include insufficient knowledge of the contents of practice guidelines and insufficient scientific antimicrobial usage information in the antimicrobial package inserts. Possible countermeasures include further promotion of education and awareness-raising, and revision of the package inserts for antimicrobial agents with expanded indications using the public knowledge application system.

Keywords: Antimicrobial resistance, AMR, Proper use of antimicrobials

Author(s): Yumiko AMAKAWA

Affiliation: Amakawa Dental Ofﬁce Gaiemmae, Minato-ku, Tokyo

Title: Aesthetic restorative treatment based on MI concept

Abstract

Aesthetic restorative treatment has become popular with the introduction of new materials and advancements in adhesion science. In addition to this, the demands of patients who want to have beautiful teeth without drilling, and minimal restorative options such as direct composite resin restorations and porcelain laminate veneers with minimal or no preparation are increasing. For such restorative options to be successful, it is necessary to understand adhesive dentistry and perform each step accurately. In this paper, I will describe the Minimal Intervention (MI) concept, treatment planning and actual steps; and some cases based on the MI concept will also be discussed.

Keywords: Minimal intervention, Direct bonding, Adhesive dentistry

Author(s): Masaya YAMAGUCHI, Shigetada KAWABATA

Affiliation: Department of Oral and Molecular Microbiology, Osaka University Graduate School of Dentistry

Title: Pneumococcal evolutionary mechanisms transcending the species barrier: Streptococcus pneumoniae acquires resistance by importing genes from oral Streptococcus

Abstract

Streptococcus pneumoniae is classified as a member of the mitis group of oral streptococci, and is a major cause of pneumonia. Drug-resistant S. pneumoniae is one of the biggest threats to human life. Recent studies have revealed that S. pneumoniae acquires drug resistance and evades vaccines by changing antigens through importing genes from related oral streptococci. On the other hand, molecular evolutional analysis can reveal the bacterial evolutional process and detect evolutionarily conserved drug targets. This paper provides an outline of these reports.

Keywords: Streptococcus pneumoniae, Oral microbiome, Resistance acquisition

Author(s): Akira SUZAKI

Affiliation: Dental Office PANDA, Kitanagoya-shi, Aichi

Title: How choices for adhesion systems should be considered from a clinical perspective

Abstract

Recent dramatic advances in adhesive technology have made highly predictable CR restoration based on the MI concept possible. A range of systems have been developed, increasing the choices available to clinicians, but at the same time, many may be wondering how to make the best use of them. This article provides an explanation of how choices for adhesion systems should be considered from a clinical perspective, with a focus on the self-etching system.

Keywords: CR restoration, Self-etching system, Selection criteria

Author(s): Takashi HITOSUGI, Takeshi YOKOYAMA

Affiliation: Department of Dental Anesthesiology, Faculty of Dental Science, Kyushu University

Title: Prevention of incident and lifesaving measures in dental clinics

Abstract

In cardiopulmonary resuscitation (CPR), manual chest compressions (MCC) should be initiated and debrillation performed as soon as possible. Severe airway obstruction during dental treatment also requires immediate release of the obstruction leading to asphyxia. However, in the unique environment of a dental clinic, it is difficult to respond to such life-threatening emergencies with general lifesaving BLS procedures. We should respond to these issues by using efficient procedures according to the environment of the dental clinic.

Keywords: Cardiopulmonary resuscitation (CPR), Manual chest compression (MCC), Asphyxia

Author(s): Katsushi SATO

Affiliation: Sato Dental Clinic La France Office, Higashine-shi, Yamagata

Title: Characteristics and treatment of cases of severe mandibular ridge resorption

Abstract

Due to the increasing lifespans of patients, each year sees more and more cases of prosthetic treatments for cases of severe mandibular ridge resorption, which is considered a difficult case clinically. Therefore, it is likely that dentists will experience difficulties in treating them. This paper lays out the characteristics of this issue, and discusses treatment methods.
1) Deformation of the retromolar pad
2) Pain and ulcerations along the mucous membrane of the lower part of the mylohyoid line
3) Elevation in the floor of the oral cavity when open
4) Flattening of the alveolar crest
5) Narrowing of the affixable alveolar crest adhesion surface
6) Thinning of the mucous membrane
7) Relocation to the inner side of the lower lip

Keywords: Elevation in the floor of the oral cavity, Adhesive impression method, Severe mandibular ridge resorption

Author(s): Makoto OBATA

Affiliation: Legal Professional Corporation Obata Law Ofﬁce

Title: Learning from case studies: strategies for trouble prevention and early resolution

Abstract

The times are changing dramatically, with the rise of the smartphone society, the COVID-19 pandemic, and the invasion of Ukraine. Correct information, including legal amendments and new notifications, changes daily, making correct information, liaison with specialists, advance preparation, and appropriate initial responses more important than ever in the practice of medicine. In this paper, we will deepen our knowledge of the rules, specific preparations, and guideposts for early resolution through three typical patient problem cases.

Keywords: Advance preparation, Appropriate initial response, Records

Author(s): Tomonari HIRAI

Affiliation: Hirai Dental Clinic, Fukuoka-shi, Fukuoka

Title: Tooth transplantation and replantation as clinical options

Abstract

Compared to dental implants, the transplantation of a patient's own tooth has an image of being a complicated and difficult procedure, but if performed properly, it is expected to have a good prognosis. In particular, the transplantation of a patient’s own immature permanent tooth is thought to be extremely effective. While comparing with implants, the method that has greater merits should be selected. In addition, intentional replantation is also used as a last resort in the treatment of refractory apical periodontitis, if indicated. This allows for the preservation of teeth that might otherwise be considered for extraction.

Keywords: Tooth transplantation, Intentional replantation, Periodontal membrane

Author(s): Toshiya KUWAHARA

Affiliation: Kuwahara Dental Clinic, Hino-shi, Tokyo

Title: Considerations for oral rehabilitation in TMD patients

Abstract

Treatment for TMD should precede oral rehabilitation in TMD patients. After the TMD symptoms have been controlled, the appropriate mandibular position for the oral rehabilitation should be decided through precise adjustment of provisional restoration. In this process, TMJ remodeling occurs, resulting in the change in mandibular position. Long-term observation and evaluation of the change in mandibular position are essential. After oral rehabilitation, occlusion and mandibular position should be monitored to ensure TMD does not recur.

Keywords: TMD, Oral rehabilitation, Mandibular position

Author(s): Junichi FURUYA

Affiliation: Department of Geriatric Dentistry, Showa University School of Dentistry

Title: Dentures and swallowing to support oral ingestion of older adults based on an inter-disciplinary team approach

Abstract

To support oral ingestion of older adults during home-visit care, it is important to deal with dentures in addition to the swallowing function. Therefore, dentists should re-define the role of dentures in dysphagia rehabilitation, understanding the relationship between dentures and swallowing. Outpatient care and home-visit care are connected; therefore dentists should provide good dentures while the patients are still able to chew properly, managing their oral hypofunction. It is also very important to use an inter-disciplinary team approach to manage oral function according to each life stage in older adults.

Keywords: Older adults, Dentures, Swallowing

Author(s): Wataru KAWANO1,2), Tomohiro KISHIMOTO1), Ryosuke YASUOKA1)

Affiliation: 1) Kyoto Dental Association
2) Department of Fixed Prosthodontics and Occlusion, Osaka Dental University

Title: The depth of Japanese onomatopoeia in dentistry

Abstract

The proposal has been made that in order to be able to share the sensations of eating by drawing on the richness of onomatopoeia in Japanese to describe food textures, it is necessary to encourage autonomous visitation of dentists and maintain oral health, including dental health. This paper is a detailed explanation of the depth of Japanese onomatopoeia used in the field of dentistry. In addition, in an era when people increasingly expect to reach their century, can communication that actively uses onomatopoeia used during infancy make it easier for dietary support or oral care through this onomatopoeia even when words or conversational abilities are lost due to senile dementia? In other words, are measures to tackle dementia actually from the start of life? This hypothesis will be examined from the neuroscience and linguistic aspects. Furthermore, this paper will also discuss, from the dental perspective, the exciting shape of future foods.

Keywords: Japanese onomatopoeia, Food texture, Food support

Author(s): Masuhiko NIKAIDO

Affiliation: Nikaido Dental Clinic, Fukuoka-shi, Fukuoka

Title: The role of provisional restoration in occlusal reconstruction

Abstract

To allow patients who suffer a range of conditions due to a deviated jaw position to recover their lost functionality and gain stable treatment outcomes, provisional restoration must be used to determine the optimal occlusal position, occlusal support, and occlusal format. Clinically, over a long treatment period, this will help provide an occlusion that constructs the right balance for the patient. This paper provides an explanation of the difficulties of bite raising and occlusal reconstruction, the role of provisional restoration, and migration to the final prothesis.

Keywords: Occlusal reconstruction, Aesthetic appreciation, Functions

Author(s): Kanji NOHARA

Affiliation: Department of Oral-Facial Disorders, Division of Functional Oral Neuroscience, Osaka University Graduate School of Dentistry

Title: Polypharmacy measures from the point of view of dentistry

Abstract

Polypharmacy has become an issue in clinical medical care for the elderly, and one of its symptoms is drug-induced dysphagia. Typical causes of drug-induced dysphagia are hypnotics, antipsychotics, antiemetics, antiepileptic drugs, and muscle relaxants. If a patient with dysphagia is taking these drugs, it is advisable to consult with the prescribing doctor and actively reduce or discontinue the drug. It is of great significance for dentists to tackle drug-induced dysphagia when dealing with polypharmacy.

Keywords: Polypharmacy, Dysphagia, Aspiration

Author(s): Kazuhiko NAKANO

Affiliation: Department of Pediatric Dentistry, Osaka University Graduate School of Dentistry

Title: Infective endocarditis initiated by dental treatment:groundbreaking findings from research of cardiovascular disease caused by cariogenic bacteria

Abstract

Infective endocarditis (IE) is known in the dental field as a major systemic disease. For patients considered to be at risk for IE, antibiotics prophylaxis is recommended when performing dental procedures known to cause bacteremia. In addition, severe dental caries and periodontitis can lead to exposure of blood capillaries, allowing for persistent invasion of oral bacteria into the bloodstream. Although the immune system can respond to invading bacteria, special attention should be given to such patients with an endothelial injury.

Keywords: Infective endocarditis, Oral bacteria, Dental treatment

Author(s): Mineka YOSHIKAWA

Affiliation: Department of Advanced Prosthodontics, Graduate School of Biomedical and Health Sciences, Hiroshima University

Title: Oral antimicrobial-resistant bacteria and eating and swallowing functions in older adults requiring nursing care in long-term medical treatment: what dental professionals can do to support older adults’ ability to eat until the end of life

Abstract

We conducted a colonization survey of oral antimicrobial-resistant bacteria (ARB) in long-term care facilities, and found ARB that cause aspiration pneumonia. Many older adults whose nursing care is worsening also have dysphagia, and frequently develop aspiration pneumonia as the immune system declines. This paper considers preventive measures for aspiration pneumonia for these elderly from a dental care perspective.

Keywords: Antimicrobial-resistant bacteria, Older adults requiring nursing care, Dysphagia

Author(s): Shuji TOYA1), Tomonori MATSUNO2)

Affiliation: 1)Oral and Maxillofacial Surgery, The Nippon Dental University Niigata Hospital
2)Oral and Maxillofacial Surgery, The Nippon Dental University Hospital

Title: Drug-induced xerostomia and dry mouth treatment

Abstract

As the aging society leads to an increase in the number of multidrug patients, drug interactions due to polypharmacy is becoming a problem. In particular, dry mouth is a problem in dentistry. The side effects of medication and the natural reduction of saliva production due to aging cause dysgeusia and dysphagia. Therefore, this paper proposes a new classification of xerostomia and explain the actual conditions of drug-induced dry mouth. It also discusses patient support, including the effectiveness of Chinese herbal medicine seen in two cases.

Keywords: Drug-induced xerostomia, Dry mouth treatment, New classification of xerostomia

Author(s): Toyohiko SUGIMURA, Noriyasu UCHIBORI

Affiliation: Aichi Dental Association

Title: The effectiveness of oral function testing on improving oral function and preventing oral frailty

Abstract

Frailty is the stage between health and requiring care, and is considered a reversible stage. In other words, frailty needs to be dealt with to prolong healthy lives, and dentistry is thought to play an important role in the early detection and improvement of decline of oral function or oral frailty, which shows up before frailty sets in. The Aichi Dental Association was the first dental association to be consigned with the MHLW Health and Welfare Bureau for the Elderly’s “Grant for the Promotion of Health Care for the Elderly, Research Project on Health and Welfare Promotion for the Elderly” and carried out a study over a period of four years. This paper covers the outline of this study and reports on the effectiveness of oral function testing.

Keywords: Oral function decline, Oral frailty, Oral function testing

Author(s): Fukio NAKAGAWA

Affiliation: Nakagawa Dental Clinic, Osaka-shi, Osaka

Title: Reconsidering periodontal pocket resective therapy

Abstract

In the 1960s, a number of periodontal surgical procedures that are still in use today were published overseas. Since the 1980s, reports have been published even in Japan on the indications, detailed surgical procedures, and prognoses of these periodontal surgical treatments. Almost half a century has passed since periodontal surgery was systematically introduced in the national health insurance system, and the current role of resective therapy for the purpose of improving the periodontal environment prior to prosthetic treatment is reviewed.

Keywords: Biological width, Physiological bone morphology, Osseous surgery

Author(s): Yumi TSUCHIDA, Maiko IWAKI, Manabu KANAZAWA

Affiliation: Department of Digital Dentistry, Tokyo Medical and Dental University (TMDU)

Title: Current mainstream and future methods of digital processing in prosthetic dentistry

Abstract

The term “digital dentistry” has become widely known in the field of dentistry. The main steps in digital processing for prosthetic dentistry begin with digital impression taking, or scanning of intraoral information, followed by prosthesis design, the fabrication of CAM data for processing, and processing the materials. In this article, the current mainstream methods, which are expected to be used in the future, and the latest clinical cases using digital processing methods.

Keywords: Digital dentistry, CAD/CAM, Prosthetic dentistry

Author(s): Masamichi YAMAMOTO

Affiliation: Yamamoto Dental Clinic, Chiyoda-ku, Tokyo

Title: MTM for stable oral environments: effective use of leveling, extrusion,uprights, and intrusion

Abstract

Every dentist wants to preserve teeth in better condition in their daily clinical practice. Risk factors should be eliminated as much as possible in consideration of tooth maintenance and stability. In that sense, dentists frequently encounter the scenario of “If we could just shift this tooth....” MTM, minor tooth movement, is considered one choice to get close to high quality comprehensive dental treatment. While it is important to learn from the manual, in actual clinical practice patient situations vary, so creativity is needed to deal with them individually. This paper presents examples of MTM that can be effectively used as pre-prosthetic treatments, preparing the oral environment through a bare minimum of minor changes to the oral cavity. These use typical MTM techniques such as leveling, extrusion, uprights, and intrusion and are not limited to aesthetic improvements, but include teeth with subgingival caries, fractured teeth, inclined teeth and extruding teeth.

Keywords: MTM, Preparing the oral environment, Long-term stability

Author(s): Takeshi NOMURA

Affiliation: Department of Oral Oncology, Oral and Maxillofacial Surgery, Tokyo Dental College

Title: Determining tooth extraction: systemic diseases and dental strategies in a super-aging society

Abstract

With the advancement of medical science, the average life expectancy has been increasing in Japan. However, a lot of elderly patients with medical problems visit dental clinics. When dentists make the decision to extract teeth for these patients, we have to consult with a physician about their overall medical issues. To form a medical/dental collaboration, we need to understand each other's treatments. We also have to choose the best dental care for the patients. We believe that the time has come to determine tooth extraction indications for the new era, considering issues from both medicine and dentistry.

Keywords: Super-aging society, Tooth extraction, Medical/dental collaboration

Author(s): Yutaka TERAO

Affiliation: Niigata-ekimae Dental Clinic, Niigata-shi, Niigata

Title: Aiming for coexistence and stability of implants and natural teeth to enhance the effectiveness of Implant prosthetics

Abstract

Currently, implant prosthetics are often performed for partially edentulous cases. In order for the patient to realize the benefits of implant prosthetics, it is necessary to control inflammation and occlusal forces appropriately and to ensure favorable long-term coexistence and stability of both implants and natural teeth. To achieve this, it is important to preserve the dental pulp. It is also important toprestore the continuity of tissues lost due to caries or periodontal disease, and construct periodontal and peri-implant environment with high cleansability. Then, restorative prosthetic treatment with high conformity and precision should be performed in order to achieve stable occlusion.

Keywords: Coexistence and stability of implants and natural teeth, Cleansable periodontium and peri-implant tissue, Stable occlusion

Author(s): Katsuhiko KIMOTO

Affiliation: Department of Fixed Prosthodontics, Kanagawa Dental University

Title: Dementia and oral function: evidence and new approaches through medical-dental collaboration

Abstract

In recent years, it has been proposed that modifying some risk factors within the framework of the life course can reduce the development of dementia, and oral function has attracted attention as one of these risk factors. However, there is still no consensus on the relationship between oral function and dementia. This paper describes the current status of dementia in Japan and its relation to oral function, and also introduces a new approach based on medical-dental collaboration as a future development.

Keywords: Oral function, Dementia, Medical- dental collaboration

Author(s): Tetsuo OHYAMA, Hiroyasu YASUDA

Affiliation: Department of Partial Denture Prosthodontics, Nihon University School of Dentistry

Title: What to do when maxillofacial prosthetic cases come to your clinic?

Abstract

This article details the precautions and methods used to determine the level of risk for dental treatment and to safely treat presented maxillofacial prosthetic cases, which are generally difficult, even without advanced training in treatment. This paper aims to help maxillofacial prosthetic cases with relatively low risk for treatment to return to a comfortable life by making it possible to provide restoration and maintenance of oral function safely and securely without having to visit a distant specialized medical institution.

Keywords: Maxillofacial prosthetic cases, General practitioner, Postoperative management

Author(s): Takahiro BIZENJIMA1), Masayuki KOUNO2), Atsushi SAITO3)

Affiliation: 1)Tokyo Dental College Chiba Dental Center
2)Tokyo Dental College Suidobashi Hospital
3)Department of Periodontology, Tokyo Dental College

Title: Concept and clinical practice of supportive periodontal therapy

Abstract

The goal of periodontal treatment is to remove bacterial plaque and its retention factors to improve periodontal inflammation and achieve clinically healthy periodontal tissue. However, the oral environment is constantly changing, and may even be influenced by systemic and environmental factors, so there is always a risk of recurrence after periodontal treatment. Long-term maintenance of periodontal tissue requires supportive periodontal therapy (SPT), which is performed following active periodontal treatment. This article will provide an overview and the scientific rationale of SPT, and what needs to be assessed in the transition to SPT.

Keywords: Periodontal disease, SPT, Maintenance

Author(s): Kotaro NAKATA

Affiliation: Nakata Dental Clinic, Nishikyo-ku, Kyoto

Title: Clinical applications of periodontal plastic surgery

Abstract

Periodontal plastic surgery has been developed for the purpose of improving cleanability and acting as a secondary treatment for periodontal disease as a preventive treatment by improving the oral environment. Due to increased expectations for aesthetics among patients recently, as well as functionality and predictability, the variations are expanding. Therefore, this paper presents clinical applications of periodontal plastic surgery based on the latest findings.

Keywords: Periodontal plastic surgery, Pretreatment for prosthetic treatment, Aesthetics

Author(s): Yuko MOROZUMI, Soh SATO

Affiliation: Department of Periodontology, The Nippon Dental University School of Life Dentistry at Niigata

Title: Periodontal disease and dementia

Abstract

Elderly people with dementia have poor oral hygiene and a large number of lost teeth. Recent years have seen reports on the relationship between periodontal disease and periodontopathogenic bacteria and cognitive function. In the super-aged society of Japan, periodontal therapy is essential for reducing chronic in-ammation and preventing tooth loss in order to extend healthy life expectancy.

Keywords: Periodontal disease, Dementia, Tooth loss

Author(s): Mitsuhiro TSUJI

Affiliation: Tsuji Dental Clinic, Matsue-shi, Shimane

Title: Effective periodontal regenerative therapy from a micro-perspective

Abstract

A large number of textbooks and papers for periodontal regenerative therapies have been published in recent years. These literatures present key points in periodontal regenerative therapies. While not dismissing the importance of these key points, a “micro-perspective” may provide additional benefits for periodontal treatment. In addition, clinical harvesting method of autogenous alveolar bone is described. The author considers the autogenous bone the best bone graft material for regenerative therapy. What is invisible to the naked eyes can be very important for periodontal treatment.

Keywords: Macrophage, Periodontal regenerative therapy, Autogenous bone graft

Author(s): Kanta MORI1), Suguru KIMOTO2)

Affiliation: 1)Aichi Dental Association
2)Department of Gerodontology and Home Care Dentistry,School of Dentistry, Aichi Gakuin University

Title: Foundations and practice of home-visit treatment in dentistry

Abstract

It is believed that there will be an increasing need for home-visit dental care provided at private homes or facilities due to the rise in the number of people who are unable to visit clinics, due to being elderly requiring care, disabled, or so on. The first post-war baby boom generation, from the late 1940s, will become late-elderly starting in 2025, so we would like to enable home-bound patients to enjoy the benefits of dental treatment through having as many family dentists provide home-visit dentistry as possible as part of a community-based integrated care system.

Keywords: Home-visit dentistry, Community-based integrated care system, Family dentist

Author(s): Masahiro KITAMURA, Shinya MURAKAMI

Affiliation: Department of Periodontology, Division of Oral Biology and Disease Control, Osaka University Graduate School of Dentistry

Title: Towards the fostering and evolution of basic fibroblast growth factor （FGF-2）medicine （Regroth®）

Abstract

Six years have passed since the launch of Regroth®, the world's first periodontal tissue regenerative medicine from Japan. FGF-2, the active ingredient of Regroth®, optimally activates periodontal tissue stem cells in the alveolar bone and periodontal ligament and promotes angiogenesis at the administration site, thereby achieving periodontal tissue regeneration. This review outlines the clinical significance of using Regroth®, the limitations of its efficacy, and its future prospects, as well as the key points to keep in mind when performing flap surgery using Regroth®.

Keywords: Periodontal disease, Periodontal tissue regeneration, Regroth®

Author(s): Akihiro SUGAI

Affiliation: Sugai Dental Clinic, Kawasaki-shi, Kanagawa

Title: Role of the family dentist in a super-aged society as seen from home-visit dentistry

Abstract

Many elderly people who want to eat orally until their deaths regularly visit Sugai Dental Clinic. However, some patients suddenly stop coming, and, despite inquiring with their families about them, the author becomes concerned about the insides of their mouths. Knowing that starting home visit dentistry would be quite hard when added to the busy daily schedule of examinations, so it was hard to suggest a check up visit to the families. On the other hand, on visiting people’s homes for home visit dentistry, it was found that there is a role for the family dentist separate to that of the dental clinic.

Keywords: Home visit dentistry, Special nursing home for the aged, Super-aged society

Author(s): Ken-ichi TONAMI

Affiliation: Department of General Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University

Title: Accurate and efficient comprehensive diagnoses in dentistry

Abstract

According to the dual process theory, human thought patterns consist of intuition (System 1) and reasoning (System 2), and clinical reasoning is carried out in cooperation with these two systems. System 1, which is frequently used in dentistry, is capable of quick decision-making, but is inferior to System 2 in accuracy. Misdiagnosis caused by using System 1 has been found sometimes in the dental examination of new outpatients in the TMDU hospital. To compensate for its disadvantage, we propose a diagnostic process that uses metacognition for System 1.

Keywords: Clinical reasoning, Dual process theory, Metacognition

Author(s): Yoshiki IMAMURA, Noboru NOMA

Affiliation: Department of Oral Medicine, Nihon University School of Dentistry

Title: Diagnosis and treatment of chronic orofacial pain

Abstract

Despite amelioration of acute pain in accordance with the reduction of inflammation due to tissue damage, chronic pain develops in parallel with plastic changes in the brain in relation to the transmission and control of pain signals, causing dysfunction of the brain network. These changes result in pain aggravation and persistency, and localized treatment, including dental procedures, may not lead to the expected pain relief. Pain medication and treatment procedures that suppress central sensitization and facilitate descending pain inhibition are recommended.

Keywords: Chronic pain, Central sensitization, Descending pain inhibition

Author(s): Yoshihiko MUTOBE

Affiliation: Mutobe Dental Clinic, Osaka-shi, Osaka

Title: Clinical techniques of modified ovate pontic (fingertip pontic) with aesthetic considerations

Abstract

An ovate pontic is a fixed bridge pontic with an attractive and hygienic basal surface form. In pursuit of long-term aesthetics, there may be still room for improvement in the original ovate pontic basal surface morphology. This article discusses a new pontic form that is clinically applied to achieve long-term aesthetics and be as close as possible to natural tooth morphology, as well as its improvements and clinical techniques.

Keywords: Ovate pontic, Fingertip pontic, Post form technique

Author(s): Haruaki KITAGAWA, Satoshi IMAZATO

Affiliation: Department of Biomaterials Science, Osaka University Graduate School of Dentistry

Title: Current status and usefulness of bioceramic endodontic sealers

Abstract

Recently, new endodontic sealers such as MTA-based root canal sealers that are already on the overseas market or sealers containing bioactive glass have become available in Japan. This article discusses these “bioceramic” root canal sealers and their current status and usefulness, including the composition of each product and findings reported in scientific papers. The “bioceramic” sealers are useful root canal filling materials that may be a new option for clinicians who have thought that they have no choice but to use zinc oxide (non)eugenol sealers in their daily practice.

Keywords: MTA, Bioactive glass, Endodontic sealer

Author(s): Koutaro MAKI

Affiliation: Department of Orthodontics, School of Dentistry, Showa University

Title: Considerations in aligner orthodontics

Abstract

In aligner orthodontics, it is important to understand both the mechanisms and causes of various failures, and how to solve them. This paper presents a typical problem case in aligner treatment with considerations of the cause, then introduces the viewpoints and knowledge necessary for safe and secure treatment. In particular, it should be noted that there is a great deal of biological information that is not included in computer simulations.

Keywords: Aligner, Problem cases, Points of attention

Author(s): Yasuhiro HAYASHI

Affiliation: Hayashi Dental Clinic, Kikuchi-shi, Kumamoto

Title: Clinical cases over forty years indicate the direction of clinical progress

Abstract

Many chronic diseases are reversible, but most oral diseases are irreversible. When a condition goes downhill to a certain level, it never climbs back up again. Therefore, it is crucial to stop the progression of caries and periodontal disease and try to prevent their recurrence. To achieve this, treatment outcomes should be followed-up, as unsatisfactory results are sometimes identified during long-term observation. On the other hand, experience through treating many cases can show a certain direction of treatment. The author has been practicing for more than forty years, and has been entering the information of almost all patients into his own database for the last 25 years, so the clinical direction can be determined based on the analysis of those data. This paper describes this through case reports.

Keywords: Long-term follow-up, Plaque control, Association of occlusal forces with oral health

Author(s): Taihiko YAMAGUCHI

Affiliation: Department of Crown and Bridge Prosthodontics, Division of Oral Functional Science, Faculty of Dental Medicine, Hokkaido University

Title: Diagnosis treatment and management of sleep bruxism useful in daily clinical practice

Abstract

Bruxism is considered a risk factor for a range of dental diseases. In order to formulate a treatment plan for bruxism, it is necessary to fully understand the actual state of the issue in individual patients. With the emergence of wearable electromyographic devices and the coverage of dental electromyography during sleep by the Japanese national insurance system in 2020, it has become possible to perform tailor-made treatments based on accurate and simple examinations.
This article explains how bruxism is seen and what kind of treatment and management plans should be established in daily clinical practice.

Keywords: Bruxism, Tooth grinding, Dental electromyography during sleep

Author(s): Takumi MORITA

Affiliation: Department of Physiology, School of Dentistry, Aichi-Gakuin University

Title: Relationship between clenching and exercise: correct comprehension of remote facilitation

Abstract

Clenching is known to increase electromyographic amplitude of the H reflex and voluntary muscle activity. This phenomenon is called “remote facilitation” and is expected to be applied to the generation of strong muscle strength. On the other hand, it has also been noted that it may work against smooth movement because it facilitates both flexor and extensor muscles simultaneously and attenuates Ia inhibition. This paper will explain the basics of remote facilitation as known from past studies, and introduce the relationship between masseter muscle activity and actual exercise, using examples of movements performed in rugby and kyudo.

Keywords: Remote facilitation, Tooth clenching, Muscle activity

Author(s): Yasufumi HORINOUCHI

Affiliation: Oral and Maxillofacial Surgery, Kyushu Central Hospital of the Mutual Aid Association of Public School Teachers

Title: Techniques for skillful residual root extraction

Abstract

Factors that make residual root extraction difficult are: (1) the tooth is fragile and easily broken, (2) the periodontal ligament space cannot be seen directly because the root surface is below the gingiva, (3) narrowing of the periodontal ligament space, bony adhesion, and alveolar bone sclerosis have occurred. In order to extract a residual root safely and efficiently, it is necessary to carry out additional procedures such as raising the gingival-periosteal flap, forming a groove for inserting an elevator, dividing the root, and removing the bone rather than trying to extract the root with only forceps and an elevator.

Keywords: Tooth extraction, Residual root, Root division

Author(s): Hisatomo KONDO1), Toshiki NOJIRI1), Teruaki HONMA2), Masaru OHASHI3), Takuto YAMANAKA3)

Affiliation: 1)Department of Prosthodontics and Oral Implantology, School of Dentistry, Iwate Medical University
2)Chiba-Ken Dental Association,
3)Tokyo Dental Association

Title: Response of the dental community to international sports competitions: feedback from the Tokyo 2020 Olympic and Paralympic Games

Abstract

At the Tokyo 2020 Olympic and Paralympic Games, held from July to September 2021, a general clinic (polyclinic) including a dental clinic was set up in the Olympic and Paralympic Village where the athletes stay during the Games In competition venues where oral injuries were expected to occur frequently, in addition to doctors, nurses and physiotherapists, dentists also served as medical staff. In the Olympic and Paralympic Village, the dental clinic was equipped with six dental units to provided dental treatment and oral hygiene care for the participating athletes. During the Games, Japanese dentists, dental hygienists, and dental technicians provided dental care from early morning until late at night. The Tokyo 2020 Games polyclinic was evaluated by the IOC as being of the highest level ever, and the dental department was also at the top level in the athlete satisfaction survey. The dental services provided at the Tokyo 2020 Games were achievements that the dental community could boast of to the world in the way they came together to play a major role in improving the oral health conditions of top athletes. The purpose of this feedback report is to present how dental professionals have contributed to the Tokyo 2020 Games, and to provide insights to the support for future international competitions.

Keywords: Sports, Dentist, Tokyo 2020 Olympic and Paralympic Games

The Journal of the Japan Dental Association

ENGLISH

2022 VOL.75

NO.1 April

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NO.2 May

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NO.3 June

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NO.4 July

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