日本補綴歯科学会雑誌

補綴領域における接着技法の効果, 問題点および将来

山下敦

2000 年 44 巻 6 号 p. 725-738
発行日: 2000/12/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.44.725

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Almost 20 years have passed since adhesive materials became utilized for dentistry. In the earlier period, the purpose of adhesive dentistry was to establish better durability of dental restorations by adhesive luting cements. Currently the materials contribute to increasing the tooth survival rate by decreasing tooth grinding by dentists and preventing the secondary caries for the effect, resulting in improved quality of life.
On the other hand, during this time period, the concept of medical practice has shifted from being doctor-oriented to being patient-oriented, requiring true clinical efficacy and economical cost performance. To fulfill these two requirements in dentistry, we, clinical researchers, should assist the evidence-based clinical approach by producing more rigorous clinical research evidence that indicates adhesive dentistry can promote patients' quality of life.

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顎口腔機能統合検査装置の応用によるバーチャル咬合器の開発

竹市卓郎, 阿部俊之, 鍋田伸郎, 墨温子, 橋本和佳, 伊藤裕, 加藤栄蔵, 市原加文枝, 川口豊造, 林達秀, 八木 ...

2000 年 44 巻 6 号 p. 739-745
発行日: 2000/12/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.44.739

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A virtual articulator was constructed on a computer monitor screen, from a stone dental model that was constructed by a 3 dimensional form measuring device and the measuring results of a submaxillary 6-degree-of-freedom movement. And a tracing of mandibular movements of a patient was reproduced. The relationship between mandibular movements and the occlusal pattern was visually constructed. Simulation of various occlusal conditions became possible by the virtual articulator at this time.

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チタン製補綴装置に関する基礎研究

CAD/CAM法の表面粗さが適合性に及ぼす影響

秋山逸馬

2000 年 44 巻 6 号 p. 746-756
発行日: 2000/12/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.44.746

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Owing to its high corrosion resistance and good biocompatibility, titanium has become keenly watched as a metallic material for dental application in recent years. Because of its material property, however, titanium has not yet become sufficiently prevalent in clinical practice. In this study, therefore, a possible dental application of titanium for prostheses was investigated. Namely, maxillary major connectors of different palatal forms were prepared by a CAD/CAM (Computer Aided Design/Computer Aided Manufacturing) system, to examine the influence of the manufacturing process on adaptability and surface roughness, with the following results.
As to adaptability, the CAD/CAM system produced fewer gaps in bilateral residual ridges and in the center of the palate, but it produced recognizable gaps in alveolar areas. In addition, it was revealed that good adaptability is obtained with shallower palates, and the gap in alveolar areas is increased with deeper palates. As for surface roughness, stratified and linear traces were observed during the finishing process. Further, the surface roughness varied at each determination site depending on the positional change of the end mill.

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歯根部歯質の残存量が支台築造した歯の破壊強度に及ぼす影響: 天然歯による予備的検討

長田貴幸, 割田研司, 川和忠治

2000 年 44 巻 6 号 p. 757-767
発行日: 2000/12/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.44.757

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The aim of this study was to investigate the influence of post-core methods and the remaining radicular tooth structure on the fracture resistance of pulpless teeth. Two types of remaining radicular tooth structure were tested: one group had sufficient radicular tooth structure, and the second had thinwalled-flared canals. The prepared post holes were restored with one of five different post-core methods: the metal post and cores cemented with zinc-phosphate cement; the metal post and cores cemented with Super-Bond C & B; C-POST and composite resin core; AD POST II and composite resin core, and composite resin only. Each group was tested until the root fractured with a slowly increasing force at 90 degrees to the long axis.
The results were as follows:
1. The use of a metal post and cores resulted in higher fracture resistance than those recorded for teeth restored with composite resin.
2. Fracture resistance of teeth restored with a metal post and cores decreased with decreasing radicular tooth structure; nevertheless, there was no significant difference.
3. A composite resin post and cores could be used for the restoration of thin-walled-flared canals.
4. Fractures were detected at the core-dentin interface in all specimens; therefore, core-dentin interfaces must be strengthened.

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重付加型シリコーンゴム印象材の流動性に関するレオロジー的研究

泉田明男, 細谷誠, 木村幸平

2000 年 44 巻 6 号 p. 768-775
発行日: 2000/12/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.44.768

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The purpose of this study was to give polyaddition-type silicone impression materials (Regular Type) the characteristics that the pastes are easy to mix, and they are difficult to hang down from the tray. In a previous study, the inorganic filler significantly affected the flow characteristics of impression materials. As usual, polyaddition-type silicone impression materials (Regular Type) do not have a yield value in the flow characteristics. A material with a yield value has superior workability characteristics.
We attempted to make pastes of mixtures having a yield value. The silicone prepolymers used were vinyl polydimethylsiloxanes with 56, 000 and 85, 000 molecular weights (Mw), and the inorganic fillers used were quartz and synthetic silica (micro filler). The flow properties of experimental pastes were investigated by using a cone-plate viscometer, from the rheological point of view. As a result, a little addition of synthetic silica in experimental pastes made a flow property having a yield value and was effective in working. This study suggests a direction in manufacturing impression materials toward including superior characteristics that had low viscosity and was easy to mix in working.

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テンポラリークラウン用レジンからの未反応モノマーの溶出挙動

川口稔, 高橋裕, 宮崎光治, 羽生哲也

2000 年 44 巻 6 号 p. 776-780
発行日: 2000/12/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.44.776

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Leaching of methyl methacrylate (MMA) monomer from commercially-available temporary resins (five chemically-cured materials and a light-cured material) was determined by means of highperformance liquid chromatography analysis. Leaching of MMA monomer after being immersion in distilled water was dependent on the type of the materials. The amounts of leached monomer were higher on the first day and gradually decreased for one week. After one week of immersion in distilled water, the leaching of MMA monomer continued at a lower concentration level till up to 6 weeks. For light-cured temporary resin, prolonged exposure duration significantly reduced the amount of leached MMA monomer.

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義歯装着および咬合位の変化が無歯顎者の重心動揺に及ぼす影響について

丸谷美和, 清水公夫, 大沼智之, 小司利昭, 森田修己

2000 年 44 巻 6 号 p. 781-785
発行日: 2000/12/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.44.781

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To clarify the correlation between the changes in the status of the occlusion system and the systemic posture, an investigation of the states of denture wearing in edentulous and changes in their body sways associated with occlusal support was made, focusing on the postural reflex. Body sway was assessed under four conditions: during clenching, centric occlusion, the rest position wearing upper and lower dentures and during the rest position with no dentures. The following results were obtained:
1. The standard deviation in the X component (right-left direction) of body sway was significantly larger during the rest position without dentures than during either of the rest position, centric occlusion, or clenching with dentures.
2. The differences in the standard deviations in the Y component (anterior-posterior direction) were not significant among the above four conditions.
3. The distance of body sway during the rest position with dentures was significantly larger than any distance during centric occlusion or clenching with dentures, or during the rest position without dentures.

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顔面皮膚上標点とそれに対応する下顎骨上仮想点の運動の比較

下顎安静位について

関谷俊治, 山縣健佑, 河野勇治, 七田俊晴

2000 年 44 巻 6 号 p. 786-795
発行日: 2000/12/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.44.786

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To register mandibular movements in edentulous subjects, reference points are usually attached on the soft tissue over the chin. Therefore, it is extremely beneficial, in the clinic, to know the relationship of the movement between the skin and the mandibular bone. The purpose of this study was to detect the reference points on the facial skin that had the least discrepancy with the corresponding sites on the mandibular bone while in a rest position.
Methods: Nine retro-reflective markers were placed on the skin over the mandible (around the menton, the gonion, etc.) of 10 dentulous subjects. In addition, a marker frame, on which 3 markers were arranged spatially, was attached to the mandibular teeth of each subject, to provide a measured value of virtual points that were indicated by a stick on which 2 markers were aligned. Markers on the facial skin (S) were located and automatically tracked using six video cameras while the mandible was moved from centric occlusion to the rest position, repeatedly. Measurements of virtual points (V), which were calculated from displacement of the marker frame utilizing a motion capture system (Vicon 370, Oxford Metrics), were combined with the video data of the markers. The distance between centric occlusion and the rest position (Co-Rp) of S and V were compared.
Results: Except for the center of the menton (Me 2), statistically significant differences were observed between Co-Rp of S and V. These results suggest that Me 2 is the appropriate reference point on the facial skin to accurately measure free way space.

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顎機能異常者の咬合分析に関する研究

咬合近接部発現歯について

柳田史城

2000 年 44 巻 6 号 p. 796-807
発行日: 2000/12/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.44.796

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The following were researched: number of teeth with near-occlusal contacts for groups of 11 controls (4 males, 7 females) and 23 patients with temporomandibular disorders (TMD)(9 males, 14 females); the ratio of the number of teeth with near-occlusal contacts appearing in each tooth position to the number of subjects in each group; and the distribution of near-occlusal contacts under electromyogram (EMG) biofeedback in each group.
The results were as follows:
1. There was a tendency for patients to have fewer teeth with near-occlusal contacts than controls, but it was not statistically significant.
2. The appearance rate of second molars with near-occlusal contacts in patients was significantly higher than that of other tooth regions (p<0.05).
3. Regarding the distribution of near-occlusal contacts, there was a tendency for controls to have near-occlusal contacts on both left and right sides. On the other hand, patients have a tendency to show near-occlusal contacts on one side.
Based on the results, it was suggested that there was a relationship between TMD and near-occlusal contacts under EMG biofeedback.

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正常者と関節円板前方転位復位型患者における側方滑走運動時の作業側顆頭の運動解析

大沼智之, 森田修己

2000 年 44 巻 6 号 p. 808-813
発行日: 2000/12/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.44.808

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The objectives of this study were to obtain high-precision data of mandibular movements in the working side condyle of normal subjects, and to show the difference between working side condylar movement in normal subjects and patients with anterior disk displacement with reduction. Thus, movements were analyzed using a six degrees of jaw movement tracking device.
1. The movable range of the working side condyle was 0.58±0.26mm in the forward and backward direction, 0.73±0.24mm in the lateral direction, and 0.58±0.19mm in the vertical direction, in the normal subjects. In the patients with anterior disk displacement with reduction, on the other hand, the values were 0.96±0.60mm in the forward and backward direction, 1.19±0.60mm in the lateral direction, and 1.27±0.70mm in the vertical direction.
2. Concerning the amount of shift of the working side condyle in the patients with anterior disk displacement with reduction, three-dimensional shift (p=0.035), lateral shift (p=0.017), downward shift (p=0.020), and vertical shift (p=0.005) were significantly greater compared to the values in the normal subjects.

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関節円板前方転位症例における前方滑走運動時の顆路傾斜角

長尾亜希子, 金村清孝, 鈴木卓哉, 佐藤真, 藤澤政紀, 塩山司, 石橋寛二

2000 年 44 巻 6 号 p. 814-820
発行日: 2000/12/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.44.814

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To understand the relationship between anterior disc displacement of the temporomandibular joint (TMJ) and condylar guidance inclination, condylar movements during protrusive movement were analyzed in 780utpatients (63 females and 15 males;mean age, 35.4±14.1y) having anteriorly displaced disc confirmed on magnetic resonance images. Thirty outpatients (18 females and 12 males; mean age, 37.8±14.5y) without disc displacement were also enroIled as a control group. Mandibular movement was recorded with a six-degree-of-freedom jaw tracking device, to obtain every 1-mm change in condylar guidance inclination during protrusive movement guided by anterior teeth.
Since inclinations of the condylar path were significantly larger in the disc displaced group (36.7±12.6°) than in the control group (33.1±11.6°)(P<0.05;t-test), steep inclinations of the condylar path could be a contributing factor of anterior disc displacement of the TMJ. However, there was no statistical significance in the inclinations of the condylar path between disc displacement with reduction and without reduction. The results show that condylar guidance inclination has little association with disc reduction status.

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顎関節・筋症状を伴う部分無歯顎患者に対する義歯補綴治療

7年間のフォローアップ

横山雄一

2000 年 44 巻 6 号 p. 821-822
発行日: 2000/12/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.44.821

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キャスタプルセラミックスを応用した審美修復

鈴木浩樹

2000 年 44 巻 6 号 p. 823-824
発行日: 2000/12/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.44.823

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下顎顎堤が著しく吸収した高齢無歯顎者に対する義歯製作の一例

岩崎雅充

2000 年 44 巻 6 号 p. 825-826
発行日: 2000/12/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.44.825

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分割折りたたみ義歯を適用したmicrostomiaの補綴症例

鈴木恭典

2000 年 44 巻 6 号 p. 827-828
発行日: 2000/12/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.44.827

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クラウン, ブリッジ, パーシャルデンチャーによって咬合再構成を行った一症例

谷岡望

2000 年 44 巻 6 号 p. 829-830
発行日: 2000/12/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.44.829

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上顎固定性ブリッジおよび下顎パーシャルデンチャーを用いて咬合再構成を図った一症例

難波秀和

2000 年 44 巻 6 号 p. 831-832
発行日: 2000/12/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.44.831

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顎機能検査ならびに咬合診査を用いた顎機能異常症例について

今井敦子

2000 年 44 巻 6 号 p. 833-834
発行日: 2000/12/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.44.833

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FGPテクニックを用いた単独冠の補綴処置の5年経過

田中順子

2000 年 44 巻 6 号 p. 835-836
発行日: 2000/12/10
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.44.835

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