First Step to Understand Jaw Movement -For the CAD/CAM Era-

顎運動を攻略するための第一歩 CAD/CAM 時代に向けて―

The Journal of Japanese Society of Stomatognathic Function


Case report of recurrent temporomandibular joint open lock associated with abrupt reduction of displaced articular disk

This report describes the case of a 51-year-old male patient who initially presented at age 23 with a habitual intermittent open lock (at >35mm) in the left temporomandibular joint (TMJ). The patient was able to manage this affliction through rapid-repetition jaw opening and closing. Tomography of the joint showed no irregular morphology, but intraoral examination revealed an occlusal interference at the mandibular left third molar during leftwards excursion. For this patient, alteration of lateral guidance using a palatal plate attached to the maxillary left canine precluded this intermittent open lock, but at 22 years of age, the open lock recurred and could not be relieved by the patient, who was unable to assume an occlusal position. Because conservative treatment was ineffective, a pumping manipulation technique was applied to reduce the open lock, after which the patient has maintained good jaw function. MRI taken before and after repositioning indicated that abrupt reduction of a displaced articular disk was the cause of the open lock, and that this articular disk was restored to its proper position during the manipulation. Most TMJ open locks occur as anterior dislocation, where the mandibular head becomes trapped anterior to the articular eminences, causing excessive opening and difficulty closing. Our clinical findings from this patient indicate that open lock can occur through abrupt reduction of a displaced articular disk, particularly in patients with chronic internal derangement of the TMJ. TMJ open lock can occur following abrupt reduction of a displaced articular disk.


主機能部位でのストッピング嚙みしめ時の顆頭運動

主機能部位でのストッピング嚙みしめ時の顆頭運動


Effect of occlusal contact stability on the jaw closing point during tapping movements.

PURPOSE: We studied the relationship between tapping point reproducibility and stability of occlusal contacts at maximum intercuspation. METHODS: Tapping movements of 12 adult volunteers who had dentition with natural teeth were recorded, and distances between the tapping point (TP) and the intercuspal position (ICP) at the incisal point were calculated. Occlusal contacts at the ICP of individual subjects were also evaluated with black-colored silicone impression material. The correlation between TP-ICP distance and occlusal contact stability was studied. RESULTS: TP-ICP distance exhibited negative correlations with the total number of teeth showing occlusal contact at the ICP. Standard deviations of TP-ICP distance also negatively correlated with the extension of occlusal contact area over dentition. CONCLUSIONS: This finding indicates that occlusal contacts at the ICP affect the kinematic behavior of tapping movements. The results of this study also suggest that jaw movement data may provide useful clinical information for the evaluation of occlusal contact at ICP.


Verification of kinematic condylar point


Study on measurement and Analysis of Jaw Movements during Sleep Bruxism

睡眠時ブラキシズム発現に伴う顎運動の測定解析法の検討


Current status of researches on jaw movement and occlusion for clinical application


Assessment of allergic hypersensitivity to dental materials

Some metallic materials in dental prostheses may cause allergic hypersensitivity. Symptoms appear not only in the oral cavity, but also on hands, feet or the entire body. Release of metal ions is thought to cause the allergic reactions; micro-particles of the corrosion products of the metal and/or ionic metal hydroxides/oxides may be the allergens. The study purpose was to review clinical surveillance of dental allergic hypersensitivity in our dental hospital. From July 2000 to June 2005, 212 patients with suspected dental metal allergy were patch tested with 26 reagents, including 19 ready-made patch test reagents (Patch test reagents, Torii Pharmaceutical Corporation, Tokyo, Japan) and 9 custom-made reagents. One-hundred-and-sixty-seven patients were females (78.8%) and 45 patients were males (21.2%). A total of 148 patients (69.8%) had one or more positive patch test reactions. The most common allergens were nickel (25.0%), palladium (24.4%), chromium (16.7%), cobalt (15.9%) and stannum (12.5%). Typical allergic symptoms and diagnoses were Pustulosis palmaris et plantaris, lichen planus, stomatitis and contact dermatitis. This study indicates that dentists and dental researchers should be concerned about the allergenic potential of dental metal materials.


Studies on the Standardization of Parameters for Jaw Movements Analysis --- 6 Degree-of-Freedom Jaw Movements Analysis

顎運動解析パラメータの標準化に関する検討 --- 6自由度顎運動解析

The Journal of the Japan Prosthodontic Society


Studies on the Standardization of Parameters ofr Jaw Movements Analysis --- - Jaw Movement analysis at the Incisal Point-

顎運動解析パラメータの標準化に関する検討 --- ー切歯点における限界運動路解析ー

Purpose: To establish standardized evaluating methods for jaw movements analysis independently of the reference coordinate system. In this paper, we focused on the analysis of incisor point paths of border movements. Then we investigated parameters that are independent of the reference coordinate system and can be utilized among different systems.Methods: Recorded data of jaw border movements from 20 healthy male adults were employed as basic samples. First, the effects of changes of the reference coordinate systems on the analysis were investigated. Second, the line between incisor points at the intercuspal position and the maximal mandibular opening position was used as the reference line. Then the area index of incisor paths was calculated with the length of the perpendicular line dropped from the incisor point to the reference line and the displacement of the foot of the perpendicular.Results: Changes of the spatial relation between a reference plane of the coordinate system and border movements pathways had an effect on a measured area of projected pathways, about 2%-5% differences of projected area on the frontal plane with 10 degrees rotation around a horizontal axis. The area index of incisor paths showed close correlation with the actual area of a 3-dimensional plane bounded by the incisor path [sagittal border movement: ϱ = 0.53 (p = 0.016), left border opening pathway: ϱ = 0.97 (p < 0.001), right border opening pathway: ϱ = 0.98 (p < 0.001), Spearman rank correlation].Conclusion: The results suggest that new parameters could measure jaw border movements quantitatively independent of the reference coordinate system.

目的 : 本研究では, 解析時の基準座標系が異なっても利用可能な顎運動の評価基準を確立することを目的とし, 切歯点限界運動経路を対象として新たな解析パラメータについて検討を行った.方法 : 顎口腔系に特に異常を認めない成人男性20名 (平均年齢25.0 ± 8.2歳) の限界運動データを使用した. 解析では, まず基準座標系の違いの影響を検討するため, 基準面の傾きと投影面積の変化について検討した. 次に咬頭嵌合位と最大開口位を結んだ線を基準線とし, 各顎位からこの直線への垂線を計測して, 垂線の足の移動距離と垂線の長さから切歯点運動範囲指数を求めた. この指数の妥当性については, 三次元空間内での運動経路範囲を三次元曲面面積として計測した値との相関を求め検証した.結果 : 前頭面投影図面積は, 運動経路と前頭面の角度的関係が10度変化すると2%∼5%程度の影響を受けることが明らかとなった. 一方, 新たに求めた切歯点運動範囲指数は, 限界運動路で囲まれた面の三次元曲面面積と有意な相関を示した (矢状面内限界運動, ϱ = 0.53 (p = 0.016), 左側方限界開口路, ϱ = 0.97 (p < 0.001), 右側方限界開口路, ϱ = 0.98 (p < 0.001), Spearman rank correlation).結論 : 新たに考案したパラメータは, 基準座標系に依存することなく三次元的な限界運動経路を数値化することが可能であることが示された.


Methods for Computer-Aided Diagnosis of Mastication

コンピュータ支援による咀嚼運動診断のための解析方法

Our research group is developing a system for computer-aided diagnosis(CAD) of mastication, that is based on the hypothesis of the Craniomandibular Control System. In this article, we described methods how to analyze the movement of condyle in temporo-mandibular joint with CAD system, and how to use dynamic data for diagnosis. Result of our research suggested that the method visualizing and measuring the distance between points on the fossa and those on the condyle is useful to see dynamic charactaristics of the movement of condyle. Using these methods we can see the effects of the altered anterior guidance on working side condylar movements. To complete our CAD system, we have two technical challenge, the one is automatic segmentation of osseous components from data digitized copmputed tomography, and the other is innovation of reference face bow unit that sets coordinate system of jaw tracking device and that of morphorogical data together.

現在私たちの研究グループでは，顎機能制御系の仮説に基づいて，形態情報と運動を加えた咀嚼運動のCADシステム構築を目指している．本稿ではこのシステム構築のための顎関節の解析方法を示すとともに，診断への可能性を示す例として補綴装置が顎運動に及ぼす影響を提示した．骨関節隙を用いた顆頭運動評価は顎関節の微小な動きをダイナミックに表現でき，診断に有用と思われる．また，補綴装置の形態の違いによって顎関節の動きに変化が認められ，診断への応用が可能である．咀嚼運動のCADシステムが広く使用されるために克服すべき技術的課題として，CT画像における顎関節形態の自動認識，形態および顎運動の座標系統一のための冶具の改良が挙げられる．


Investigation on the Allergic Condition among the Dental Professionals


An allergy survey among dental professionals

Purpose: Medical materials in clinical settings could function as risk factors that cause allergic symptoms. This issue is particularly relevant to dental professionals because they are exposed to various allergens. The objective of the present study is to conduct an allergy survey among dental professionals and clarify the actual prevalence and other parameters of allergies.Methods: An anonymous questionnaire was distributed to employees and dental students working at the University of Tokushima Dental Hospital (currently, the Department of Dentistry, Tokushima University Hospital).Results: Valid responses were obtained from 294 individuals (145 males and 149 females). The average age of the respondents was 34.0 years. Of the respondents, 61.2% had experienced some subjective symptoms associated with allergy. The most common allergic symptom was allergic rhinitis (40.1%), and 20.4% of the respondents perceived themselves to be allergic to medical gloves.Conclusion: The study results indicated that the prevalence of subjective allergic symptoms was higher among dental professionals than among the general public or other healthcare professionals. This suggests that dental professionals work in an environment where they are likely to be sensitized to different allergens.


スパイラルCTを用いた顎関節の三次元評価法

スパイラルCTを用いた顎関節の三次元評価法

Three-dimensional (3-D) image reconstructed from Computed Tomography (CT) data is an ef>cient method to evaluate temporomandibular joint (TMJ) morphologically. Even the 3-D image reconstructed from spiral CT data has some distortion, typically along to the table feed direction, very few studies were reported about accuracy of reconstructed 3-D image size. The purpose of this research was to evaluate the distortion on 3-D image reconstructed with spiral CT (Somatom Plas4, Siemens Co, Germany) quantitatively. We used three imaging targets, eight ceramic balls placed at corners of cubic frame, a calibration cube that has the CT value nearly equal to cortex bone of human dried mandibular head. We evaluated relation between a threshold level of CT image processing and reconstructed 3-D image size with a custom-made computer program. CT data of ceramic balls clari>ed changes of the reconstructed image, -0.215mm for table feed direction and less than ±0.006mm for the other directions. The calibration cube was used for the arrangement of optimal scanning condition (reconstruction mode, collimation, reconstitution interval) and evaluation of reconstructed image size. The distortion of the image was +0.207mm for table feed direction and less than +0.029mm for the other directions. Changes of dried skull TMJ image reconstructed with the optimal scanning condition were -1.463mm for lateral direction of the condylar head, -0.956mm for back and forth direction and -0.580mm for table feed direction. Results of this research suggested that the level of the 3-D image distortion was mostly affected with the scanning condition. And the size of 3-D image was susceptible to the threshold level of CT image processing. Consequently, we think that the standardization of scanning condition should be concerned for the quantitative evaluation of 3-D TMJ image using CT data.


Development of a novel articulator that reproduced jaw movement with six-degree-of-freedom

A novel robotic articulator that reproduced a six-degree-of-freedom jaw movement was developed and tested. A precise six-axis micro-positioning stage was employed for this articulator. A high-resolution jaw-tracking device measured the functional jaw movement of the patient and a six-axis micro-positioning stage reproduced recorded jaw movement data. A full veneer crown restoration was fabricated with this articulator system. A working cast was mounted on the positioning stage of the articulator. An occlusal table with soft wax was attached on the cast tooth die, and the jaw movements were reproduced to create a functionally generated path on the occlusal table. The finished occlusal record was used to obtain the wax pattern for the crown. In this subject, no intra-oral occlusal adjustment was necessary for setting the finished full veneer crown. Since this articulator could perform a precise reproduction of the dynamic jaw motion during the functional jaw movement, this system has potential to improve accuracy of the prosthetic teeth occlusion.


Relationship between occlusal tooth contactpatterns and tightness of proximal tooth contact

The aim of this study was to investigate the relationship between occlusal tooth contact patterns and the tightness of proximal tooth contact (TPTC) during clenching. Twenty young adult volunteers with healthy dentition participated in the study. TPTC between the left second premolar (P2) and the first molar (M1) was measured during clenching at the 50% maximum voluntary contraction level in the intercuspal position (ICP). A silicone impression material was used to make an interocclusal record at the ICP in each subject, and interocclusal records were analysed using an image-processing system. Subjects were classified according to the presence or absence of each type (A, B or C) of occlusal contact. Statistical analysis was performed using the Mann-Whitney U-test. The results of this study exhibited a relationship between B-type contact and the TPTC of maxillary teeth. The experimental group with a lack of B-type contact on maxillary P2 and/or M1 showed a statistically greater TPTC than the group with B-type contact on both of these teeth (P < 0.01). These results suggest that occlusal tooth contact patterns have an influence on TPTC during clenching.


A New Method for Designing Functionally Generated Occlusal Surface with Six-Degree-of-Freedom Articulator

6自由度咬合器を用いた機能的咬合面製作法の開発


Evaluation of proximal tooth contact tightness at rest and during clenching

The aims of this study were to develop a device for measuring the tightness of proximal tooth contact and to evaluate the proximal contact tightness using this device at rest and during clenching. Twenty young adult volunteers with healthy dentition participated in this experiment. The tightness of proximal tooth contact between the second premolar and the first molar of both the maxilla and the mandible was measured by pulling a stainless steel strip between them at rest, and at 20 and 50% clenching levels of maximum voluntary contraction of masseter muscles at intercuspal position. Proximal contact tightness increased as the clenching levels of both the maxilla and the mandible increased. At rest, proximal contact tightness was less in the maxilla than in the mandible, whereas during clenching it was less in the mandible. These results indicate that during clenching, the teeth are displaced and they contact appropriately with adjacent teeth, making it possible to exert sufficient occlusal force while maintaining the integrity of dental arches.


Evaluation of Risk Factors Concerning Loss of Osseointegration of Dental Implant

歯科インプラントのオッセオインテグレーション喪失に関与するリスクファクターの検討

Journal of Japanese Society of Oral Implantology

日本口腔インプラント学会誌


Evaluation of Clinical Factors Conserning Osseointegration Establishment of a Dental Implant

歯科インプラントのオッセオインテグレーション獲得に関与する臨床的要因の検討

日本口腔インプラント学会誌


Effects of occlusal force loading on tooth movement in six degrees of freedom --- Development of an analysis system

The purpose of this research was to evaluate tooth movement in six degrees of freedom under occlusal force loading. The right side upper first premolar movement of an adult volunteer without any signs or symptoms of periodontal disease was studied. A small occlusal table mounted on a force transducer was clipped between the upper and lower dentition. Occlusal force was applied to the buccal cusp, palatal cusp or central fossa of the first premolar and also to the right side canine aspect by clenching this occlusal table. The right side first premolar movement relative to the left side first premolar was measured by means of a highresolution six degrees of freedom motion detector. The three-dimensional shape of the first premolar was measured with following methods. A 3-D digitizer with a touch sensor probe was used to measure the coronal part of a cast stone model of the tooth. Computerized tomography data were used to obtain the root shape of the tooth. These movement and configuration data were combined to perform computer graphics analysis of the three-dimensional tooth movements. The range and direction of tooth movement were varied by altering the position and amplitude of occlusal force loading. Since the magnitude of the tooth movements was relatively small, we adapted the screw axis (helical axis) concept to emphasize tooth movement on the computer graphics representations.

The Journal of Japanese Society of Stomatognathic Function


Comparative study of jaw function in TMD clinic patients and dental students of the University of Tokushima

当科顎関節外来受診患者および本学歯学部学生を対象とした顎機能調査

Journal of the Japanese Society for the Temporomandibular Joint


Quantitative study of bite force during sleep associated bruxism

Nocturnal bite force during sleep associated bruxism was measured in 10 subjects. Hard acrylic dental appliances were fabricated for the upper and lower dentitions of each subject. Miniature strain-gauge transducers were mounted to the upper dental appliance at the right and left first molar regions. In addition, thin metal plates that contact the strain-gauge transducers were attached to the lower dental appliance. After a 1-week familiarization with the appliances, nocturnal bite force was measured for three nights at the home of each subject. From the 30 recordings, 499 bruxism events that met the definition criteria were selected. The above described system was also used to measure the maximum voluntary bite forces during the daytime. The mean amplitude of detected bruxism events was 22.5 kgf (s.d. 13.0 kgf) and the mean duration was 7.1 s (s.d. 5.3 s). The highest amplitude of nocturnal bite force in individual subjects was 42.3 kgf (15.6-81.2 kgf). Maximum voluntary bite force during the daytime was 79.0 kgf (51.8-99.7 kgf) and the mean ratio of nocturnal/daytime maximum bite force was 53.1% (17.3-111.6%). These data indicate that nocturnal bite force during bruxism can exceed the amplitude of maximum voluntary bite force during the daytime.


Evaluation of Occlusal Relationship at Molars during Masticaion

咀嚼時の臼歯部咬合関係の評価

The Journal of the Japan Prosthodontic Society


徳島大学歯学部附属病院特殊歯科総合治療部顎口腔機能治療部門における顎関節症の実態調査


An epidemiological study of jaw function in dental students of the University of Tokushima

徳島大学歯学部学生を対象とした顎機能診査


Reproduction of masticatory movement by the duplicator

Journal of Japanese Society for Mastication Science and Health Promotion


小児の6自由度顎運動解析

小児の6自由度顎運動解析


Evaluation of Occlusal Contact Image on Articulating Paper Record

咬合紙記録における咬合接触像の評価


A Development of A High Resolution Measuring System of Movement in Six-Degree-of-Freedom

高分解能6自由度運動測定器の開発


Survey of patients at the Center for Special Care in Dentistry, Tokushima University Dental Hospital

特殊歯科総合治療部を受診した患者の実態調査


Functional Rehabilitation of an Edentulous Patient with Hard and Soft Palate Defects and Its Assessment

無歯顎，硬·軟口蓋欠損患者の機能回復とその評価

Journal of the Japanese Academy of Maxillofacial Prosthetics


Study of Bite Force during Sleep Associated Bruxism

睡眠時ブラキシズムにおける咬合力の研究


A proposal of quantitative evaluation method of occlusal facets with parameters of x axis value of direction cosine and inclination angle

方向余弦のx成分と傾斜角をパラメータとした咬合小面の定量的評価法の提案

The Journal of Japanese Society of Stomatognathic Function


Three Cases of Application of Osseointegrated Implant to Surgical Reconstructive Area in Oral Cancer Patients --- Discussion of the Management of Reconstructive Soft Tissue Surrounding Implants

口腔癌切除後の外科的再建部へオッセオインテグレーテッドインプラントを応用した3例 --- インプラント周囲の外科的再建組織の処理法に関する考察

Journal of Japanese Society of Oral Implantology

日本口腔インプラント学会誌


The study on the occlusal facets of molars from the standpoint of harmony with jaw movements

顎運動の調和という観点からみた大臼歯咬合面形態の検討


光造形装置による顎位の実体モデル化

光造形装置による顎位の実体モデル化


Metal Allergy Patients at Fixed Prosthodontic Clinic of The Tokushima University Dental Hospital

徳島大学歯学部附属病院第2歯科補綴科における金属アレルギー患者


Analysis of biological signals during sleep associated bruxism

睡眠時ブラキシズム発現に伴う生体信号の解析


Development of a New Jaw Tracking Device to Analyze Sleep Associate Bruxism

ブラキシズム解析用顎運動測定器の開発

The Journal of the Japan Prosthodontic Society


Evaluation of stomatognathic function of female volunteers with six degree of freedom jaw tracking device using two magnetic fields in quadrature phase

磁気位相空間を応用した6自由度顎運動測定による女性被験者についての顎運動機能評価


The Analysis of Clicking Sound --- The relation between the loudness of clicking sound and sound spectrum

クリッキングの音響解析 --- クリッキング音の大きさと音響スペクトルとの関係について


The Analysis of Clicking Sound --- The relation between the laudness of clicking sound and sound spectrum

The aim of this research was to investigate the acoustic characteristics of clicking sound. In this article, Peak Sound Pressure Level (PSPL) and Mean Poer Frequency (MPF) were studied, and the relation of both parameters was investigated. The subjects were 6 patients with unilateral reciprocal clicking coused by anterior displacement of the disc with reduction. The results were as follows. 1. The mean values of PSPL ranged 78.2dB-103dB 2.The mean valuesof MPF ranged 428Hz-758Hz 3.According as PSPL increased, MPFshifted higher range in 4 of the 6 subjects.

クリッキング音と音響特性について検討した．クリッキング音のピーク音圧レベル(PSPL)とMean Power Frequency(MPF) について解析を行った．研究対象を福井を伴う関節円板前方転位に起因する変則性のクリッキング患者6名とし，顎運動とともに測定した． 1．クリッキング音の大きさをピーク音圧レベルで表すと各被験者の平均値は 78.2dB-103dBであった． 2．各被験者のMPFの平均値は428Hz-758Hzであった． 3．クリッキング音のPSPLの上昇に伴い，MPFが広域にシフトしたものが4名であった．


Study of muscular sound in masseter muscle


顎関節症患者における下顎頭の経時的な骨形態変化に関する一考察

顎関節症患者における下顎頭の経時的な骨形態変化に関する一考察


Examination and Diagnosis from the Viewpoint of Jaw Movement --- Current Status and Prospects

下顎運動からみた診査·診断 --- 現状と将来展望

Journal of The Japanese Association for Dental Science


6自由度顎運動測定による下顎切除患者の顎口腔機能評価

6自由度顎運動測定による下顎切除患者の顎口腔機能評価

Journal of the Japanese Academy of Maxillofacial Prosthetics


The Effect of the Craniomandibular Deformation on Analysis of the Jaw Movements

咬合力による顎口腔系の変形が顎運動解析に及ぼす影響

At the present time, there are several Jaw movement analyzers that can analyze the condylar movements in six degrees-of-freedom. All of them are mounted between maxillary and mandibular face-bows. And all investigators study jaw movements on assumption that the human body is rigid. But the occlusal force causes the displacement of teeth and deformation of bones. In this study, we measured the displacement of maxillary dental arch during clenching with two occlusal conditions in three subjects, and evaluated its effects on analysis of Jaw movements quantitatively. We recorded the clenching for three times with each condition in each subject. The results are as follow : 1 . Maxillary dental arch displacettaent during clenchiuag in the intercuspal position averaged 29±11μm superiorly, 17±23μm at the right side and 5±14μm anteriorly at bilateral first molars. And during clenching on the unilateral first-molar pivot, they averaged 35±18μm superiorly, 5±22μm medially and 21±27μm anteriorly at the maxillary first molar of the working-side. 2. In the vertical direction, the maxillary tooth arch disrlacement showed the condyle more inferior than the real position. Those values were 63±47μm at both condyles (clenchig in the intercuspal position) and 31±65μm at the working-side condyle (clenching on the pivot).

顎運動の測定では，頭部と下顎，あるいは上下顎歯列間の相対的な運動を計測する方法が一般的であり，咬合力作用時に歯の変形や変位，骨の変形が生じることを認めつつも，顎口腔系と測定器を剛体と仮定して解析を行っている．本研究では，徳島大学歯学部第二補綴科で開発したディジタル方式下顎運動測定器を使用した顎運動解析において，咬合力作用時に生じる顎口腔系の変形が測定結果に与えている影響について詳細な検討を行った．


Condylar movements in clicking joints during ipsilateral lateral excursion

クリッキング側顆頭の同側側方滑走運動時の顆頭運動


Kinematic study of the main occlusal area

主機能部位の運動論的検討

The Journal of Japanese Society of Stomatognathic Function


Development of Prototype Jaw Operated Alternative Computer Mouse

下顎の動きで操作する代替コンピュータマウスの試作


Study on a kinematic dentl bite registration method --- -Determination of the position of the mandibular condyle-

運動論的咬合採得法の検討 --- -顆頭位の決定法について-


睡眠時ブラキシズム中の顎運動様式

睡眠時ブラキシズム中の顎運動様式


Study on Analysis of Jaw Movements during Nocturnal Bruxism Event

睡眠時ブラキシズム発現に伴う顎運動の解析法の検討

日本補綴歯科学会誌. 特別号, 社団法人日本補綴歯科学会学術大会プログラム・抄録集 = Program and abstracts, the ... scientific meeting of Japan Prosthodontic Society


Development of a new method to evaluate jaw function with six-degree-of-freedom jaw movement and three-dimensional reconstructed image of TMJ

6自由度顎運動と顎関節三次元再構築画像による顎機能評価法の開発(D13)

Journal of the Japanese Society for the Temporomandibular Joint


Accuracy of three-dimensional temporomandibular joint reconstruction using spiral CT

スパイラルCTを用いた顎関節の三次元構築精度(B2-8)


The Relation between Dental Metal Allergy and Electromotive Force of Dental Materials

歯科用金属アレルギーと口腔内金属の起電力の関係

The Journal of the Japan Prosthodontic Society


Six Degree-of-Freedom Analysis of Border Jaw Movement Position

ヒト下顎限界運動顎位の6自由度解析

本研究では,下顎限界運動路上の顎位に対する下顎の動態を明らかにする目的で,前歯部における下顎限界運動軌跡に沿った連続的顎位と軌跡上の位置へ直接移動させた離散的顎位との違いを6自由度の運動学的特性から追究した．その結果,前歯部の顎位は,連続的顎位と離散的顎位との特性がほぼ一致したが,顎関節部では,運動を構成する6自由度の要素間で特性に差が生じた．これは,下顎上の位置によってそれぞれ限界運動範囲が異なり,運動範囲内の顎位分布も異なったためである．これより,歯列部と顎関節部では,連続的な下顎限界運動の動態に違いが生じることが明らかになった．


Measurement and Reconstruction of Occlusal Tooth Contact

歯の噛み合わせの測定と再現

知能メカトロニクス専門委員会 研究報告

知能メカトロニクス専門委員会 研究報告


小臼歯と大臼歯間の隣接関係の計測

小臼歯と大臼歯間の隣接関係の計測


Measurement of Tooth Movement with a Novel Device in Six Degrees of Freedom


The Relationship between Jaw Movement and Masseter Muscle EMG during Sleep Associated Bruxism


Development of Six Degree of Freedom Jaw Tracking Device Utilizing Two Magnetic Fields in Quadrature Phase and Measurement of Jaw Movement


顎運動測定における生体の歪と解析への影響

顎運動測定における生体の歪と解析への影響

最新の6自由度顎運動測定器では，上下顎を剛体と仮定して運動の解析が行われているが，歯の移動，顎骨の変形などの影響については未解決である．本研究では成人男性有歯顎者5名を用いて，咬合力作用時の上顎歯列弓の頭蓋に対する変位を計測し，下顎頭運動解析時の影響量を推定した．この結果，咬合力作用時には上顎歯列弓の変位が下顎頭部の解析において130μm程度の誤差を生じさせているのでないかと考えられた．


金属アレルギーとピアスの関係について

金属アレルギーとピアスの関係について


アンテリアルガイダンスの診断と治療

アンテリアルガイダンスの診断と治療