Japan Dental Association

Author(s): Kenichi KURITA, Shinichi TANIGUCHI

Affiliation: Department of Oral and Maxillofacial Surgery, School of Dentistry,Aichi Gakuin University

Title: Coronectomy for lower third molars : usefulness and procedures

Abstract

Coronectomy is performed when contact between the tooth root（s）and the inferior alveolar nerve is suspected. We have performed 392 coronectomies since 2005. The post-operative course was uneventful in 374 cases（95.4%）. Temporary lower lip hypoesthesia from nerve injury was observed in only one case（0.3%）. Seventeen residual roots were extracted, without nerve damage, because of dry socket, incomplete wound closure, eruption into the pocket and subgingival eruption. Residual roots caused no major complications such as severe ostitis or the morbidities. Coronectomy can be used for the extraction of third molars where there is a high risk of inferior alveolar nerve injury.

Keywords: Coronectomy, Sensory paralysis of the lower lip, Tooth extraction

Author(s): Haruka NISHIMATA１），Tomonori HOSHINO２），Taku FUJIWARA２）

Affiliation: １）Clinic of Pediatric Dentistry, Nagasaki University Hospital
２）Department of Pediatric Dentistry, Nagasaki University Graduate School of Biomedical Sciences

Title: Knowledge for dentists and dental hygienist about sugar group and sugar-substitutes

Abstract

Sweeteners are used to sweeten food, and sweeteners used in lieu of sucrose are known as sugar-substitutes. Sweeteners are classified into sugar-type and non-sugar-type. Sucrose is the best sweetener, but is compromised by its cariogenic activity. Although some sweeteners are less or non-cariogenic, few are anti-cariogenic. The prevention of dental caries by sweetener control alone is considered impossible. A systematic review revealed that most reports on the caries inhibitory effect of xylitol were lacking in good quality evidence. Dentists should understand the properties of sweeteners and put that knowledge to use in clinical practice.

Keywords: Sugar, Sugar-Substitutes, Dental caries

Author(s): Shinya MURAKAMI

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

Title: REGROTH®, a new FGF-2 medicine for periodontal regeneration : its development, mode of action and precautions when using

Abstract

In September of 2016, REGROTH® was officially approved by the Ministry of Health, Labour and Welfare of Japan. REGROTH® was developed in Japan and is the world’s first periodontal regenerative medicine. REGROTH® consists of 0.3% basic Fibroblast Growth Factor（FGF-2）and 3% hydroxypropylcellulose and is applied topically to bone defects during flap surgery. Stimulating proliferation and migration of periodontal tissue stem cells, angiogenesis, and extracellular matrix production, REGROTH® accelerates periodontal regeneration at the sites it is applied to.

Keywords: Periodontal regenerative therapy, FGF-2, REGROTH® 341144

Author(s): Yasuko MOMOI

Affiliation: Department of Operative Dentistry, Tsurumi University School of Dental Medicine

Title: Long-term Management of Root Caries using Fluoride and Glass Ionomer

Abstract

Many unclear points remain regarding the pathology of dental root caries, and EBM-based restorative treatment has not yet been established for it as it has been for tooth crown dental caries. Therefore, arresting caries by atraumatic treatment, that is, remineralization using fluoride, may better extend tooth life than conventional “drill and fill” restoration for initial caries even with loss of substance. Due to the location and morphology of the caries, when we determine that there is uncertainty as to whether infected dentin has been removed and complete removal of infected dentin would weaken the residual tooth structure, it is better to halt removal of the infected dentin and switch to urgent temporary restoration using glass-ionomer or remineralization therapy followed by continuous management. Root caries treatment should be characterized by early detection and long-term management.

Keywords: Root caries, Fluoride, Glass ionomer

Author(s): Kitetsu SHIN

Affiliation: Department of Oral Biology & Tissue Engineering Division of Periodontology, Meikai University School of Dentistry

Title: Maintenance of Dental Implants : Prevention, Diagnosis and Treatment of Peri-implant Disease

Abstract

Dental implant therapy plays an important role in restoring oral function. On the other hand, peri-implantitis is highly prevalent among post-operative complications of implant therapy. Peri-implantitis progresses asymptomatically and, if not appropriately treated, leads to loss of the implant. This article describes methods of peri-implant tissue maintenance necessary for long term stability after implant therapy, as well as how to deal with peri-implantitis.

Keywords: Dental implant therapy, Peri-implantitis, Maintenance

Author(s): Katsuhisa SUNADA

Affiliation: Department of Dental Anesthesiology, The Nippon Dental University School of Life Dentistry at Tokyo

Title: Anesthesia - What We Hear, and What Really Works

Abstract

The adrenaline, felypressin, preservatives and oxidants found in anesthetics for dental use can cause systemic complications. To achieve highly effective and painless anesthesia, inhalation sedation and topical anesthetics should be used, selecting a fine needle, inserting it slowly into the mucobuccal fold with bevel facing the mucosa while administering the injectable solution, and performing additional injection into the cervical gingiva. Using the proximal method with a 33 G 12 mm needle and felypressin prilocaine is a very effective anesthetic procedure for mandibular molar teeth. There is not yet enough clinical evidence for the use of intraperiodontal injections.

Keywords: Felypressin, Infiltration anesthesia, Proximal method

Author(s): Nobuhiro HANADA

Affiliation: Department of Translational Research, School of Dental Medicine, Tsurumi University

Title: Eubiotics from Dentistry

Abstract

The health problems that humans are now facing result from drastic changes in food ingredients and cooking methods, and the inability of the human body to adapt itself to this greatly changed food culture. As a result, the three major disorders of dental caries, periodontal diseases and malocclusion that are treated by dentists, as well as various lifestyle-related diseases, have been developing. It is impossible to eliminate the fundamental causes of oral diseases such as soft foods that can be eaten without chewing and a diet in which the ingredients are heated to bring out their flavors. Thus, the three major dental disorders and the various lifestyle-related diseases will remain an ongoing problem.

Keywords: Food culture, Biofilm infection, Lifestyle-related diseases

Author(s): Kazuhiko SUESE

Affiliation: Osaka Dental University Dept. Esthetic Dentistry

Title: CAD/CAM Crowns - the Secret to Success

Abstract

CAD/CAM technology developed quickly with the digitization of dentistry, and has been covered by national medical insurance as an advanced medicine technology since April 2014. With the CAD/CAM crown, new materials and technology have become widely available in a prosthetic dentistry device and, as such, it has drawn much attention. In order to offer a CAD/CAM crown that patients can feel comfortable with, three important points must be observed: good tooth preparation, the suitability of the crown for the procedure, and soundly executed adhesive bonding technique. These three points are also the ironbound rules of prosthetic dentistry, and success with CAD/CAM crown procedures requires unique clinical techniques.

Keywords: CAD/CAM technology, Crown, National medical insurance

Author(s): Ken NAKAHARA

Affiliation: Clinical Oro-Maxillofacial Bone Research and Application, Advanced Research Center, The Nippon Dental University School of Life Dentistry at Niigata

Title: Implant Treatment in a Super-aging Society

Abstract

As society ages, dentists are treating more elderly patients. Moreover, given the association between the extension of healthy life expectancy and the health of oral cavity has been attracting attention, more elderly patients will be wanting aggressive dental treatment. This report examines major current and future challenges, such as implant treatment requiring vertical alveolar ridge augmentation and implant treatment in patients to whom a bone resorption inhibitor is administered, looking at clinical cases and basic research for these treatments.

Keywords: Implant treatment, Vertical bone augmentation, ARONJ

Author(s): Satoshi KURATOMI

Affiliation: Kuratomi Dental Clinic, Kitakyushu-shi, Fukuoka

Title: Thoughts on Endodontic Treatment

Abstract

“No treatment without diagnosis” is a saying of my mentor, Dr. Koichi Shimokawa. Desultory measures taken for no clear reason cannot be called medical treatment. And in endodontic treatment, too, anatomical and pathological diagnosis largely determines the prognosis. However, because the region where endodontic treatment takes place is not readily visible, the results are not necessarily the desired results. Ongoing inquiry into what gives rise to what physiological reactions is therefore important. This paper focuses on the matter of diagnosis and treatment concept, looking at particular cases.

Keywords: Diagnosis, Apical stop, Follow-up

Author(s): Hiroshi SUZUKI, Misao KAWARA

Affiliation: Department of Oral Function and Rehabilitation, Nihon University School of Dentistry at Matsudo

Title: Dental support for the disabled athletes and custom-made mouthguard fabrication

Abstract

In recent years, there has been greater encouragement for the participation of disabled persons in sporting activities and, as a result, sport for the disabled has become as much about competing as about rehabilitation and the maintenance of function. With disabled athletes desiring greater maintenance of physical condition and increased competitiveness, this paper introduces activities of the authors to examine what it means to support disabled sports and what dentists can do to help.

Keywords: Sports for the disabled, Sports dentist, Custom-made mouthguard

Author(s): Takashi KANEDA

Affiliation: Departments of Radiology, Nihon University School of Dentistry at Matsudo

Title: Foundation and clinical applications of CT and MRI for the dentistry

Abstract

Triggered by the insurance introduction of dental computed tomography（CT）of April, 2012, Japan became the world’s best possession country of both dental CT and medical CT machines. CT and magnetic resonance imaging （MRI）have been widely used not only imaging diagnosis but also clinical application using CT and MR imaging modalities for the dentistry. On the other hand, it has been required the appropriate CT examinations without miss diagnosis or overlooked the lesion at the clinical situation in Europe and the United States. In addition, as for the MRI examination without the radiation exposure, there are some prohibitions such as cardiac pacemaker and metal prohibited for the safety MRI examinations in clinical situations.
The purposes of this review article are to describe the basics and clinical application of these modalities such as CT and MR imaging techniques, to understand characteristic CT and MR findings of maxillofacial lesions for the dental clinicians.

Keywords: CT, MRI, Clinical applications

Author(s): Hirohiko HIRANO, Ayako EDAHIRO

Affiliation: Tokyo Metropolitan Institute of Gerontology

Title: The current state in Japan relating to dementia : Basic skills dentists should know for managing and treating dental problems in dementia patients

Abstract

Japan’s rapidly aging society and the concomitant increase of people with dementia is unprecedented. In January 2015, the Ministry of Health, Labour and Welfare therefore adopted the Comprehensive Strategy to Accelerate Dementia Measures（or “New Orange Plan”）as a national strategy to bolster measures against dementia. This plan is to improve training to deal with dementia patients, which includes providing timely and appropriate dental care and oral health management in line with the dementia patient’s condition.

Keywords: Dementia, Dental problem management, Japanese Natronal Dementia Plan

Author(s): Kotaro TSUCHIDA

Affiliation: Tsuchida Dental Office, Miyazaki-shi, Miyazaki

Title: Dealing with the pathologic tooth migration commonly encountered in cases of periodontal disease

Abstract

For general dentists, there are considerable hurdles to incorporating orthodontic treatment into everyday clinical practice. However, incorporating it into treatment strategies for periodontal disease and prosthetics can broaden clinical scope. This paper examines the things general dentists should consider in cases of severe periodontal disease involving pathologic tooth migration and requiring prosthetic or implant treatment.

Keywords: Pathologic tooth migration（PTM）, Periodontal disease, Orthodontic treatment

Author(s): Sachiyo TOMITA, Atsushi SAITO

Affiliation: Department of Periodontology, Tokyo Dental College

Title: Before considering periodontal surgery : Initial periodontal therapy revisited

Abstract

In 2016, formal pharmaceutical approval was given in Japan to the use of a novel method for periodontal regenerative therapy, the REGROTH® Dental Kit, which includes FGF-2（bFGF ; basic fibroblast growth factor）. This is a significant addition to the already available options for periodontal surgery. However, before considering surgical periodontal treatment, it is important for clinicians to carefully assess the causes and risk factors of periodontal diseases and perform initial periodontal therapy to address them. Without appropriate initial periodontal therapy, a favorable clinical outcome cannot be expected even after periodontal surgery. Here we describe the current concept of initial periodontal therapy, with representative cases, hoping to highlight, once again, the importance of non-surgical periodontal therapy.

Keywords: Initial periodontal therapy, Plaque control, Periodontal surgery

Author(s): Shinya YAMANAKA

Affiliation: CiRA, Kyoto University

Title: Recent progress in iPS cell research and projected applications

Abstract

It was １０ years ago that we first reported the discovery of induced pluripotent stem cells（iPSCs）, and some research areas heve already launched clinical srudies. The appeal of iPSCs is that they can proliferate almost indefinitely and differentiate into multiple lineages. As a result, cell-based therapies, disease mechanisms and new drug development are being studied worldwide using iPSCs. In ２０１４, the world’s first clinical study using iPSCs was initiated to study the transplantation of iPSC-derived RPE（retinal pigment epithelium）sheets for age-related macular degeneration. iPSC technology resides in disease modeling and drug screening, especially in cases where tissues from patients is hard to obtain.

Keywords: iPS cells, Regenerative medicine, Drug discovery

Author(s): Hideyuki IZUMI

Affiliation: Nishimoto Dental Clinic, Nagahama-shi, Shiga

Title: Saving the pulp of a traumatized tooth : Diagnosis and treatment of complicated crown fracture

Abstract

The incidence rate of traumatic dental injury（TDI）is by no means low, with one in five children being said to experience it. Furthermore, TDI is of high importance. In most cases of complicated crown fracture, the pulp can be saved. Also, restoration methods using fragments of a fractured tooth are able to restore teeth to a high aesthetic level, meaning that acquiring the right knowledge and techniques can contribute greatly towards improving patients’ quality of life. The goals of TDI treatment are to prevent bacterial infection resulting from microleakage, carry out with precision the pulp capping that is key to treatment success, and carry out restorative treatment.

Keywords: Traumatic dental injury（TDI）, Dental pulp exposure, Saving dental pulp

Author(s): Akihiro KANEKO

Affiliation: Department of Oral Surgery, School of Medicine, Tokai University

Title: Antimicrobial therapy of odontogenic infections without increasing resistant bacteria

Abstract

Since antibiotic tissue penetration into oral tissues such as the infected jaw bone and abscess cavity is low resulting in low antibiotic concentration at the site, it is important to perform local procedures such as infected root canal treatment, abscess incision and drainage in parallel. The selection of antibiotics with strong antibacterial activities against oral streptococci and anaerobic bacteria, which are the primary causes of odontogenic infections. The frequency of involvement of obligate anaerobes increases with the severity of the inflammation. For severe odontogenic infections, antimicrobials with strong antibacterial activities against anaerobic bacteria that produce β- lactamase should be selected.

Keywords: Odontogenic infections, Antimicrobial resistance（AMR）, Guidelines for Clinical Management

Author(s): Miho KODAMA

Affiliation: Division of Prenatal Dentistry and Division of Rehabilitation for Speech and Swallowing Disorders, The Nippon Dental University Hospital

Title: Environmental changes in the oral cavity of pregnant women and safe dental treatment : Oral management from prenatal stage

Abstract

Increasing female hormones with pregnancy can have harmful effects such as gingival swelling in the oral cavity.
Furthermore, the risk of gingivitis and periodontitis increases due to frequent small meals and changes in the properties of saliva. In addition, the formation of tooth germs in fetuses begins using nutrition provided by the mothers. Postnatal infection with Streptcoccus mutans in the infant occurs mainly through contact with his/her mother. In short, a good oral environment in the mother is needed for a healthy oral cavity in the child.

Keywords: Pregnancy, Oral care, Dental treatment

Author(s): Atsushi TAKAYANAGI

Affiliation: Takayanagi Dental Clinic, Satte-shi, Saitama

Title: The science of the toothbrush : the form and physical characteristics of toothbrushes

Abstract

The toothbrush market is one of great diversity. The forms given to toothbrushes are to supplement the user’s brushing skill, and are closely related to such things as the scope of reach of the bristles and cleaning efficiency. Properly understanding such characteristics of toothbrushes and selecting self-care products that match, for example, the patient’s particular dental cavity condition and brushing skills, can help in the provision of the kind of instruction in self-care that reduces the burden of it and is readily accepted by patients.

Keywords: Toothbrush, Self-care, Brushing

Author(s): Mitsuo FUKUDA

Affiliation: Division of Periodontal Health Promotion, School of Dentistry, Aichi Gakuin University

Title: Basic knowledge in understanding oral malodor and patients with halitosis

Abstract

Presented here is a new definition of halitosis, which is needed for the treatment of halitosis in patients who are anxious about and affirm their own oral malodor. Oral malodor is recognized not only by someone else, as previously defined, but also by the patient himself or herself. Patients with halitosis should be classified as having olfactory reference syndrome, whereby they affirm their own oral malodor and suffer anxiety because of it.
This definition is based on the psychological aspect of anxiety in regard to oral malodor, and helps in understanding a patient’s complaints. Also covered is basic knowledge of oral malodor, i.e., its chemical composition, odor measurement methods, the mechanism of oral malodor generation, physiological oral malodor, and treatment protocol.

Keywords: Oral malodor, Halitosis, Volatile sulfur compounds

Author(s): Yoshiaki KAMIKAWA１），Tetsuya NITTA２）

Affiliation: １）Department of Oral Diagnostic Science, Graduate School of Medical and Dental Sciences, Kagoshima University
２）Department of Oral Surgery, Kagoshima City Hospital

Title: Case studies in palliative care oral management

Abstract

In recent years, the definition of palliative care has undergone a major change, with the 2002 WHO definition of palliative care being an approach that improves the quality of life of patients and their families facing issues associated with life-threatening illness, through the prevention and relief of suffering by means of early identification and impeccable assessment and treatment of pain and other problems, physical, psychosocial and spiritual.
As a result, demand for palliative dental care has also increased.
We outline the role of dentistry in palliative care and discuss cases.

Keywords: Palliative care, Oral management, Oral care

Author(s): Hidekazu TAKAHASHI

Affiliation: Department of Oral Biomaterials Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University

Title: Overview of characteristics of CAD/CAM resin blocks used under the national health care insurance system

Abstract

There have been many commercial composite resin blocks available for CAD/CAM premolar crowns, and covered by national health care insurance ; however, their physical properties have not been elucidated. Physical properties such as filler content, shape of filler, flexural strength, flexural modulus, water sorption, water solubility, discoloration after immersion in coffee, change of surface gloss, and wear resistance were evaluated. These properties varied among products.
The appropriate selection of CAD/CAM blocks and adhesive process is considered essential for favorable treatment outcomes.

Keywords: Composite resin for CAD/CAM, Public health insurance approved, Physical properties

Author(s): Hiyori MAKINO

Affiliation: Department of Health and Science, Faculty of Psychological and Physical Science, Aichi-Gakuin University

Title: Knowledge of dysphagia diet with which dentists should be familiar

Abstract

It is necessary for dysphagia meals to appropriately correspond to the level of a patient’s eating and swallowing function. To achieve this, it is indispensable to accurately assess the patient’s eating and swallowing function and to provide suitable meals based on the dysphagia diet standard. However, it is difficult to evaluate eating and swallowing function in patients, and it is not easy, either, to prepare and provide a stable dysphagia diet. As the person in charge of the eating and swallowing support team, the dentists is required to bring together the team and work in a clinical setting, demonstrating the latest knowledge and skills in patient assessment and support as well as in providing a dysphagia diet.

Keywords: Dysphagia diet, Eating and swallowing function, Role of dentists

Author(s): Tetsuji AOSHIMA

Affiliation: Aoshima Dental Office

Title: A restorative approach with direct resin composite techniques for cavities including approximal lesions.

Abstract

In daily clinical practice, the first choice for restoration of occlusal caries lesions and class 1 cavities is to use direct restoration using composite resin.
However, for approximal or class 2 caries lesions, indirect restoration tends to be the first option due to the difficulty of adequately restoring approximal contact points. We created a treatment method for approximal caries lesions, and for class 2 cavities that include proximal, using direct rather than indirect restoration. First, while maintaining the contact point, we introduce the horizontal slot technique, as an approach to treating approximal caries lesions. We then introduce a restoration method for solid contact points, in the event of their having been lost, using a combination of three instruments.

Keywords: Direct restoration, Horizontal slot technique, Reconstruction of contact points

Author(s): Jun TAKEBE１），Hirokazu KUMANO１），Kazumoto HOSHIAI２）

Affiliation: １）Department of Removable Prosthodontics, School of Dentistry, Aichi Gakuin University
２）Department of Dental Hygiene, Aichi Gakuin University Junior College

Title: Basic concept and design of removable partial dentures in the partially edentulous arch

Abstract

In prosthetic treatment using removable partial denture with a partially edentulous arch, it is important to preserve the interocclusal relation and remaining tooth in a healthy state for harmonization with morphology, function, and aesthetic to maintain the stomatognathic system. Particularly, in the extension base denture, it is important to allocate the functional loading ability of both the abutment teeth and ridge mucosa. Moreover, the three mechanisms of support, bracing, and retention needed to be incorporateed into the denture. These factors are very important for prosthetic treatment planning. This review describes the basic concept and design of removable partial dentures, and application of attachment for retention of removable partial denture．

Keywords: Removable partial denture, Design, Retainer for partial denture

Author(s): Takahiko SHIBA１），Yasuo TAKEUCHI２），Yuichi IZUMI２）

Affiliation: １）Section of Periodontics, Tokyo Medical and Dental University Dental Hospital
２）Department of Periodontology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University

Title: Comparison of peri-implantitis and periodontitis causative agents

Abstract

Clinical treatment of peri-implantitis is often unsatisfactory, even when applying conventional periodontal therapies commonly used in treating periodontal disease. One reason for this may be the dissimilarity of the microbiota that are prime etiologic agents of inflammation around implants and natural teeth. We performed sequence and genome analysis to identify causative agents in microbiota related to these diseases. Differences in microbiome were observed between periimplantitis and periodontitis. Furthermore, there were indications of the presence of candidate bacteria associated with the diseases, besides well-established periodontopathic bacteria.

Keywords: Peri-implantitis, Periodontitis, Bacteria

Author(s): Mitsuhiro IWATA

Affiliation: Sakura Dental Clinic

Title: Treatments for periodontal patients with malocclusion : occlusal trauma and pathologic tooth migration

Abstract

A stable occlusal relationship is essential to long-term maintenance of favorable clinical outcomes for patients with periodontal disease.
Patients who suffer from periodontal disease with malocclusion can be divided into groups : those with pathologic tooth migration resulting from periodontitis and those with advanced periodontitis caused by occlusal trauma resulting from their original problem, malocclusion. In addition, there are patients with both. The courses of treatment are different.
When comprehensive treatments（periodontal surgery followed by orthodontic and/or prosthodontic treatment）are selected, adequate diagnosis of the relationship between malocclusion and periodontitis must be made, then the treatment sequence and appropriate timing of treatments considered.

Keywords: Periodontitis with malocclusion, Occlusal trauma, Pathologic tooth migration

Author(s): Wataru NISHIDA

Affiliation: Nishida Wataru Diabetes Clinic

Title: The link between dentistry, medicine and society at large in professional oral infection control : the experience of an internist successfully treated for periodontitis

Abstract

Doctors and dentists understand the necessity of working in close cooperation with each other. However, many attempts to build “dental-general medical” cooperation have ended in failure. The reason behind the failure is posited as being ignorance on the part of many doctors of the far-reaching negative effects of oral infection on the patient’s overall sense of wellbeing. This report describes the importance and significance of professional oral infection control, which is key to promoting understanding between the fields of dentistry and general medicine.

Keywords: Periodontitis, Diabetes, Social network between dentistry and general medicine

Author(s): Noboru KITAGAWA, Yuji SATO

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

Title: Dentures and pronunciation : diagnosis and treatment

Abstract

The elderly make up over 27% of Japan’s population, and complete denture patients over 85 years of age are increasing.
Pronunciation disorders are frequently encountered in clinical practice, and this paper examines various pronunciation functions, describes pronunciation disorders caused by wearing complete dentures, and explains improvement methods that use a palatogram. In elderly complete denture patients, it is very important to distinguish between denture-related and other causes such as senility or pronunciation disorders caused by diseases of the central nervous system. Since the population will continue to age further, it is more necessary than ever to achieve an understanding of the state of the body as a whole.

Keywords: Elderly, Complete denture, Pronunciation

Author(s): Ikuko OGAWA, Masae KITAGAWA

Affiliation: Center of Oral Clinical Examination, Hiroshima University Hospital

Title: What dentists and dental hygienists should know about saliva and dry mouth

Abstract

Saliva is an essential body fluid which contributes to maintaining general health and quality of life through the protection of the oral environment and functions. It has a myriad of functions for food ingestion and oral hygiene.
Furthermore, improvement of analysis technology has made saliva useful for diagnostic and health surveillance purposes for the whole body because collection of it is noninvasive and easy. Dry mouth（xerostomia）may be induced by local or systemic causes and can lead to numerous clinical conditions affecting oral and systemic health, comfort and quality of life. Early and appropriate treatment based on accurate diagnosis by medical interview and examination is important.

Keywords: Saliva, Dry mouth, Examination

Author(s): Ryuichi TAKAOKA

Affiliation: Takaoka Dental Clinic, Minato-ku, Tokyo

Title: Prosthetic treatment for periodontally compromised teeth

Abstract

Even if there is uncertainty about whether a tooth can be spared in the face of progressive periodontal disease, there is little uncertainty when it comes to treatment approaches to the periodontal disease. However, in the case of prosthetic treatment not having been immediately initiated, subsequent splinting or progressive loss of teeth can lead to considerable uncertainty. It is challenging for the clinician to assess the abutment tooth and select a prosthetic for lost teeth, starting with what the form of the prosthetic for an individual tooth should be. This paper describes the concept of prosthetic treatment for periodontally compromised teeth.

Keywords: Prosthetic treatment, Furcation area lesion, Splinting

Author(s): Takakazu YOSHIDA１）, Satoshi KAWANO２

Affiliation: １）Asahi University
２）Department of Endodontics, Asahi University School of Dentistry

Title: Tooth anatomy knowledge required for root canal treatment

Abstract

The success or failure of root canal treatment depends on familiarity with the dental anatomy ; and knowing the number of root canals and root canal morphology is the key to successful root canal treatment. Root canal treatment is time-consuming and demands perseverance ; however, knowing the anatomy and using the correct technique, choice of operating the instrument, and procedure leads to safe and efficient root canal treatment.

Keywords: Dental anatomy, Root canal, Root canal treatment

Author(s): Masatsugu HASHIMOTO

Affiliation: Department of Forensic Odontology and Forensic Anthropology, Tokyo Dental College

Title: The role of clinical dentists in the identification of mass disaster victims

Abstract

There are two important roles for dentists when mass disasters occur. One is dental treatment of the survivors, as clinical dentists, and the other is the identification of victims, as police dentists.
The purpose of this paper is to present an overview of mass disaster victim identification. The most important matter is to recognize the different roles that dentists play. It is also important to consider our cultural background and view of life and death.

Keywords: Forensic odontology, Mass disaster victim identification, Clinical dentists 16826

Author(s): Katsuji OKUDA

Affiliation: Tokyo Dental College

Title: The use of antimicrobial mouthwash contributes to oral health

Abstract

An association has been observed between chronic oral infections and various systemic conditions such as aspiration pneumonia, cardiovascular disease, metabolic syndrome, and diabetes. It has become increasingly important to control not only acute, but also chronic, oral infections in elderly individuals. The WHO and the Japanese Government are now recommending the limited use of antimicrobial agents in the face of growing antibiotic resistance. Systemic administration of antibiotics carries the risk of disturbing the enteric bacterial flora and disturbs microbiome. Antimicrobial mouthwash is considered to reduce the risk of developing oral infections. This review focuses on the advantages of using an essential oil-containing mouthwash to improve oral health without the risk of adverse effects.

Keywords: Oral bacterial pathogenicity, Antimicrobial mouthwash, Essential oil

Author(s): Issho MATSUMOTO

Affiliation: Matsumoto memory clinic, Osaka-shi, Osaka

Title: Psychiatric and Cognitive Disorders in dental practice

Abstract

In routine dental practices, many patients with psychiatric diseases are encountered. Most of these are patients with dementia, whose number has been rapidly increasing. This study discusses the relationship between dementia, psychiatry, and differential diagnostic practices and explores appropriate responses by dental offices. In addition, family assistance essential in comprehensive community care and stress control of medical practitioners are also explored pertaining to preferred improvements in dental practices.

Keywords: Dental practice, Psychiatry, Cognitive impairment

Author(s): Yasuko INOUE

Affiliation: Inoue Orthodontic Clinic, Ikeda-shi, Osaka

Title: Points for preventing malocclusion or avoiding its exacerbation

Abstract

Compared with the unprecedented progress in dental caries and periodontal disease prevention, malocclusion prevention is still rudimentary. An improvement in this situation is highly desirable, and preventing malocclusion or preventing its exacerbation requires only a little knowledge and care. It can readily be said that the key to this held by general dentists and hygienists in close proximity to children and their guardians. Here I present the message I wish conveyed to guardians, and the points I wish taken on board by dentists.

Keywords: Malocclusion prevention, Lip closure and posture, Childcare environment

Author(s): Toshiki ARAI

Affiliation: Arai Dental Clinic, Shinagawa-ku, Tokyo

Title: Impressive clinical accuracy of the agar alginate combined impression

Abstract

There are few, if any, dentists who do not make use of the agar alginate combined impression in procedures covered by national health insurance. The technique is quite accurate, easy to perform, and cheap, thus suiting it to national health insurance treatment. Yet, unfortunately, in spite of having been a staple of clinical treatment in Japan for the past 40 years or more, the technique is one that many dentists have not had the opportunity to thoroughly master. This impression technique can be used with a degree of measurement accuracy comparable to that of silicon impression, if its features are properly understood and it is used properly.

Keywords: Agar alginate combined impression, Accurate impression, Fitting accuracy

Author(s): Yukihiro NUMABE

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

Title: A common language in multi-disciplinary cooperation : “metabo”（metabolic syndrome）and “perio”（periodontal disease syndrome）

Abstract

For multi-disciplinary cooperation, we need “a common language” to precisely convey information about the dental or periodontal condition of patients to personnel in different fields.
Currently there are objective methods by which to evaluate the state of intraoral pathogenic bacteria, periodontal inflammation and masticatory ability. Such findings on periodontal disease, etc., can be conveyed to those in other occupations in an easily understood form.
Furthermore, it is our hope that the use of abbreviations such as “perio”（periodontal disease syndrome）as a keyword for the prevention of many systemic diseases, and “metabo”（metabolic syndrome）, will be taken up not only by medical staff but by the general public as well.

Keywords: Metabolic syndrome, Periodontal medicine, PISA

Author(s): Masato KAGEYAMA

Affiliation: Kageyama Dental Clinic, Nakano-ku, Tokyo

Title: Towards the establishment of a self-care regimen

Abstract

Plaque control is essential in treating and preventing periodontal disease and dental caries. Plaque control can be divided into the professional care provided by a dentist and dental hygienist, and the self-care performed by the patient him or herself. Self-care in the form of tooth brushing, etc. is central to plaque control. Establishing a solid self-care regimen requires a system involving patient participation with suitable instruction on tooth brushing. Regular check-ups during maintenance or supportive periodontal therapy are necessary to evaluate the state of self-care.

Keywords: Self-care, Plaque control, Maintenance and SPT

Author(s): Kenji ARITA

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

Title: For tomorrow’s centenarians : caries management for primary teeth considering caries risk and patient cooperativeness

Abstract

Most Japanese children today are expected to live for over 100 years. Dental caries has become remarkably polarized: increasingly rare and mild in primary teeth, and increasingly common and severe in permanent childhood teeth. For today’s children, lifelong oral management by a dentist is very important for the quality of extended lifespans. For this reason, caries treatment for children must be safe and painless in order to avoid treatment anxiety and gain cooperativeness on the part of the patient and thus ensure ongoing dental care. This paper summarizes minimally invasive and ultraconservative restorative treatments based on new biological theories about and approaches to caries lesions.

Keywords: Treatment of primary teeth, Bipolarization of caries, Ultraconservative restoration

Author(s): Chikahiro OHKUBO

Affiliation: Department of Removable Prosthodontics, Tsurumi University School of Dental Medicine

Title: Present status of implant dentures and their attachment selection

Abstract

Removable dentures have been frequently selected for implant prosthodontic rehabilitation instead of implant fixed prostheses for reasons relating to systemic disease, anatomical limitations, and economic reasons. Removable dentures have many advantages over fixed prostheses and should be given priority when deciding which to use. This paper describes why implant dentures should be used in elderly patients with a partially or fully edentulous jaw. Indications, contraindications, complications and troubleshooting, maintenance, and considerations when selecting an attachment are also generally explained.

Keywords: Implant, Implant denture, Attachment

Author(s): Kaoru KOBAYASHI, Chinami IGARASHI, Satsuki WAKAE, Masashi SUGISAKI

Affiliation: Department of Oral and Maxillofacial Radiology and Diagnosis, Tsurumi University School of Dental Medicine

Title: Differentiation of malignant tumors diagnosed using panoramic radiographic imaging

Abstract

A diagnostic test was created to assess the ability of dentists to diagnose malignant tumors using panoramic radiographic imaging.
Conducting of the diagnostic test revealed the accuracy rate, sensitivity, specificity, positive predictive value, and negative predictive value. The results showed a large difference between the maximum and minimum values for the diagnostic ability of ６５ dentists and ２５ dental radiologists. Dental radiologists showed high values for accuracy, specificity, positive predictive value, and negative predictive value. Furthermore, it suggested a need for the creation of many more diagnostic tests.

Keywords: Diagnostic accuracy, Panoramic radiography, Malignant tumor

Author(s): Kazuhiko SUESE

Affiliation: Osaka Dental University Dept. of Esthetic Dentistry

Title: The remarkable points of the CAD/CAM crown clinical application to a mandibular molar

Abstract

Four years have passed since health insurance was extended to cover CAD/CAM crowning of a bicuspid tooth. A high-strength hybrid-type composite resin block was developed, and from December, 2017 came to be able to be used on the １st molar of the mandibular. The important points for clinical application are the suitability for molding an abutment tooth, as a crown, as a trial tooth, and for its adhesive cementation. However, compared with its use in the mandibular molar, in bicuspid application its strong occlusal force burdens the tooth, and the adhesive cementation technique is difficult.

Keywords: CAD/CAM crown, Mandibular molar, Clinical application

Author(s): Akihiro ISHIKAWA

Affiliation: Ishikawa Dental Clinic, Ota-ku, Tokyo

Title: Root coverage : treatment and evidence

Abstract

Gingival recessions are a disorder frequently encountered in the course of everyday clinical practice. However, treatment to restore gum coverage to the exposed tooth root has not been routinely implemented in the past. Root coverage is used to treat gingival recessions and, if used for the right cases, can be performed with good predictability.
This paper presents evidence for root coverage in current clinical practice, discusses data gained and techniques developed.

Keywords: Root coverage, Subepithelial connective tissue graft, Tunnel technique

The Journal of the Japan Dental Association

ENGLISH

2017

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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NO.5 August

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