日本補綴歯科学会雑誌

補綴臨床の立場からみた金属の選択基準

藤井弘之

1997 年 41 巻 4 号 p. 525-533
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.525

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顎関節円板前方転位復位型以外のclick音症例における顎関節音と下顎頭運動の特徴

永田和裕, 穴倉裕彌, 旗手敏

1997 年 41 巻 4 号 p. 534-543
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.534

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Click sounds in cases other than ADDw/r were studied in order to clarify the specificity thereof. Three subjects were diagnosed by double contrast arthrography for adhesion in the lower joint cavity, posterior displacement of the disk with reduction at the maximum opening of the mouth and incoordination of the disk, respectively.
Three joints of the subjects were compared with 20 joints of ADDw/r with click sounds as controls. The character of TMJ sounds and condylar movement were quantitatively studied using our original analyzing system.
The results were as follows:
1. MRI findings were false negative.
2. There were click sounds with condylar movement deflection or sounds similar to reciprocal click sounds in cases other than ADDw/r; therefore, it was impossible to diagnose TMD only by click sounds at opening and closing of the mouth.
3. Subject 1 had the same position for opening and closing sounds, and subjects 2 and 3 had markedly distinct sounds or condylar movement deflection at closing. These were different from those of ADDw/r.
4. In the 3 cases, these characteristics enhanced distinction from ADDw/r.

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純チタン鋳造床の臨床的評価

佐久間崇之, 佐久間盛徳, 白井やよい

1997 年 41 巻 4 号 p. 544-551
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.544

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Titanium is expected to be applied to prosthodontics because of its biocompatibility, but there are few reports on clinical investigation of titanium plate dentures. Pure titanium cast plate dentures have been made and clinically applied to 34 patients in Sakuma Dental Clinic since 1988. In 1995, 26 patients revisited the clinic, and the prognoses of their dentures were investigated.
The results were as follows:
1. In all cases, there was no discoloration, stain, or corrosion on the titanium plate surfaces.
2. Two of 37 cast clasps were broken, but it had nothing to do with blow holes or porosities.
3. These titanium cast plate dentures were satisfactory to both patients and dentists.

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質問表を用いた顎関節症の咬合治療に関する遠隔予後調査

第1報顎関節症患者全体における咬合治療の有効性

水口一, 窪木拓男, 松香芳三, 矢谷博文, 山下敦

1997 年 41 巻 4 号 p. 552-559
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.552

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The purpose of this study was to evaluate the effect of occlusal treatment on the symptoms of temporomandibular disorders (TMD) by questionnaire. Three hundred sixty-nine consecutive TMD patients who had finished treatment in our TMD clinic from April 1985 to March 1995 were included in this study. Questionnaires were sent to the patients, and 260 (80.5%) patients returned them. These patients were divided into two groups. One was the occlusal treatment (OT) group (mean age: 49.3±16.3, male/female=20/114) who received occlusal treatment. The other was a non-occlusal treatment (n-OT) group (mean age: 36.3±16.1, male/female=34/92) who did not receive occlusal treatment. The prevalence of pain in theorofacial region at the first visit was 66.9% in the OT group, and 73.3% in the n-OT group. The questionnaire included a visual analogue scale of pain (VAS), maximum range of opening (MRO), patient's estimation of treatment outcome (TO score), and daily activity limitation attributable to TMD symptoms (DAL score). As a result, no statistically significant difference could be found between the two groups for the three variables (Mann-Whiteney U-test). However, the TO score showed statistically significant difference for the three variables (Mann-Whiteney U-test).

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顎口腔系の状態と全身状態との関連に関する研究

片側性咬合支持領域の左右および大小の違いが背筋力と咬筋筋活動量とに及ぼす影響

柿沼秀明

1997 年 41 巻 4 号 p. 560-570
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.560

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Paying attention to the relation between the stomatognathic system and sports performance, the back strength and masseter muscle activity were analyzed, compared, and discussed by using different splints on the left or right of the unilateral occlusion supportive area and the following conclusions were reached.
1. As for back support, there was no noticeable difference among the subjects for the left and right of the occlusion supportive area. A maximum value was obtained when applying a maxillary type splint between the right and left second molars. The value tended to decrease as the occlusion supportive area decreased from the molars to the anterior teeth in a unilateral situation.
2. As for masseter muscle activity, it was found, in all subjects, that the value was maximized whenapplying a maxillary type splint between the right and left second molars. There was also a tendency for the level of the nonsupportive side to decrease significantly compared to that of the supportive side, and for both the supportive and nonsupportive sides to decrease when there was a drop in the occlusion supportive area from the molars to the anterior teeth, in a unilateral situation.

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下顎限界運動と最大下顎開閉口運動による顎機能診断

加藤泰二

1997 年 41 巻 4 号 p. 571-582
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.571

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The purpose of this study was to investigate useful parameters and establish an evaluation standard for diagnosis of stomatognathic function.
The details for a total of 21 patients are as follows:
1. Persons having neither subjective nor objective symptoms but having individual normal occlusion for stomatognathic (12 subjects).
2. Persons who could be classified according to disease type classification of TMD of the Japanese Society for Temporomandibular Joint and judged as type I and type II (9 subjects).
Mandibular border movement and maximal opening and closing movement of these subjects were examined.
As a result, form-like resemblance of speed curve changed with the elapse of time during maximal opening and closing movement, that is, Kendall's coefficient of concordance suggested that several levels of reproducibility can be quantitatively expressed because 3-repetition movement may become a useful index to make proper diagnosis of abnormality stomatognathic function (type I and type II of disease type classification of TMD of the Japanese Society for Temporomandibular Joint).

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オールセラミッククラウンの適合に関する研究

ステイニング法の製作工程における適合状態

中本宏

1997 年 41 巻 4 号 p. 583-592
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.583

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This study was conducted to investigate how the ideal marginal fit of wax crown changes through the injecting, staining, glazing, and cementing procedures during fabrication of the IPS Empress crownby the staining technique for the upper first premolar tooth of the Dental Study Model (500 A, NISSIN DENTAL PRODUCTS, Japan). The vertical and horizontal gaps were measured by a scanning laser microscope system at identical measuring points in each fabrication step. The thickness of the cement film in the marginal area was also measured using sectioned specimens, both faciolingually and mesiodistally.
The conclusions were as follows:
1. The state of marginal fit at the As-Press stage was Open-Extra. The Open (vertical gap) was in the range of 27.5-30.5μm, and the Extra (horizontal gap) was 30.1-39.1μm.
2. The rate of change of the vertical gap due to the shrinkage of ceramics at the first firing (Stain 1) was significantly greater than that at each subsequent firing step. This change accounted for 60-70% of the total. No significant difference was observed for the horizontal gap between steps.
3. The rate of change of the gaps at each subsequent firing step (Stain 2, Glaze 1 and 2) was small, and there was no significant difference between firing steps.
4. The state of the marginal fit of finished crowns was still Open-Extra. The Open (vertical gap) was in the range of 38.2-45.3μm, and the Extra (horizontal gap) was 20.3-30.8μm.
5. The cement film thickness at the shoulder was similar to the amount of vertical gap at the final firing step (Glaze 2), in the range of 28.7-33.1μm.

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顎口腔系の状態と全身状態との関連に関する研究

咬合支持領域の大小が頸部後屈力と頸部筋および咀嚼筋筋活動とに及ぼす影響

中島一憲

1997 年 41 巻 4 号 p. 593-603
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.593

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In contact sports especially, accidents often lead to serious injuries to the spinal cord and cervical spine injuries.
In this paper, attention was paid to the neck and surrounding muscles, because these are the major areas concerned in the prevention of trauma and injuries due to contact sports, and are vital for the resumption of sports. Several types of resin splint of the upper jaw, having different occlusion supportive areas, were used in this study to investigate what happens when the stomatognathic conditions are altered. The effects on cervical back strength and the activity of the neck and mastication muscles were observed.
As a result, it was suggested that the use of a mouth protector having a limited occlusion supportive area or in an oral cavity lacking a tooth or teeth will not control muscle activity sufficiently for cervical back strength. Thus it was indicated that appropriate measures for the occlusion supportive area are vital in terms of both safety and athletic performance.

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チタン鋳造体のサンドブラスト処理に関する研究

塚本信隆, 長谷川秀樹, 近藤大夢, 鈴木直人, 伊藤裕

1997 年 41 巻 4 号 p. 604-612
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.604

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This study was conducted to examine the surface condition of titanium castings after sandblasting.
The specimens were made using four kinds of dental titanium investments. Two kinds of sandblasting machines were used because of the difference of removability of adhering investments after observation of the range of adhering investment, and the surface roughness (Rz) was measured. Observation by optical microscope and EPMA analysis of the cross section of the specimens were carried out.
1. The order of adhering investment from no range to full range was SELEVEST CB, SELEVEST D, TINVEST CB, and T-INVEST.
2. The surface roughness of the specimens were as follows:
SELEVEST CB: 5.4μm, SELEVEST D: 5.9μm, T-INVEST CB: 4.9μm, and T-INVEST: 5.3μm.
All specimens showed lower surface roughness than Ag-Pd-Au castings.
3. The ultra thin layers of the castings made with SELEVEST were removed after sandblasting. However, about 20μm reacted layers of the castings made with T-INVEST were removed after sandblasting.
4. Elements that originated from the investments remained on the surface of the specimens after sandblasting. It indicated that some of reacted layers were left after sandblasing.
5. There is a good possibility that elements of the sand remained on the specimens after sandblasting.

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バルビツール酸誘導体を用いた歯科用常温重合レジンにおける触媒の影響

長谷川明, 勝誠, 星合和基, 平沼謙二

1997 年 41 巻 4 号 p. 613-619
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.613

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The three barbituric acid derivatives were found to be effective as polymerization initiators instead of using Benzoylperoxide-tertAmine. Of the three derivatives, 1-Cyclohexyl-5-ethyl barbituric acid (CEBA) was the most effective for the HAZE value. The setting time was the fastest at 1.0 phr of CEBA. The optimum content of Acetylacetone copper (ACu) was 10ppm. The higher the content of ACu, the faster the setting time and the more bluish the color of the cured specimens. The lower the content of ACu, the slower the setting time. Dilauryl dimethyl ammonium chloride (LMAC) was more effective for the setting time, but the setting time was not significantly different due to the content of LMAC as determined by ANOVA. The residual monomer content of the cured self-curing resin using new initiator (Ba-Cl-Cu) in acetone and water was higher than for the conventional resin (BP0-tertAmine). To reduce the residual monomer, the cured specimen should be immersed in water for at least 1 hour prior to oral insertion.

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HAコーティングインプラントの臨床的評価: 5年間の成績

田村誠, 田中收, 舞田健夫

1997 年 41 巻 4 号 p. 620-628
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.620

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In Japan, the clinical application of HA-coated implants began in 1992 after approval by the Ministry of Health and Welfare, 7 years lafer than in the United States. In this study, 420 Integral implants were placed in 98 patients (45 males and 53 females) aged 19 to 67 years at the Medical and Dental Clinic of the Health Sciences University of Hokkaido. There were 134 implants (31.9%) placed in the maxilla and 286 implants (68.1%) in the mandible. Of the 420 implants placed, all had good osseointegration at the time of second surgery, and 6 failed during the follow-up period between 1 to 60 months after restoration. The implants that failed were shorter than 10mm and no significant difference could be found between maxillary and mandibular failure rates.
According to life-table survival, the overall cumulative survival rate at 5 years was 96.98%. The amount of the hone loss measured on panoramic X-ray photos was less than 1.1mm for 5 years.
The clinical results indicate that the Integral HA-coated implant is effective in long-term treatment of patients regardless of the location of the implant.

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顎顔面断層X線撮影装置Scanora^®の補綴領域への応用に対する検討

都尾元宣, 柿谷幸男, 山内六男, 澤田尚昌, 大村典子, 長澤亨, 松岡正登, 藤下昌巳, 片木喜代治

1997 年 41 巻 4 号 p. 629-633
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.629

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A clinical application of multimodal radiography (Scanora) was reported, and the reproducibility of cross-sectional images depending on Scanora was examined.
Since it is possible to take images of dentomaxillary cross-sectional tomography clearly and easily by Scanora, teeth and jaw can be shown three-dimensionally. Therefore, it was suggested that Scanora could be an efficient means to examine and make diagnosis. Since the reproducibility of the images was superb, it was suited for periodical X-ray taking.
From the above-mentioned results, Scanora is thought to be a useful diagnostic equipment for prosthodontics.

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正常者の歯列における咬合力分布に関する研究

佐藤智昭

1997 年 41 巻 4 号 p. 634-644
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.634

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The purpose of this study was to clarify the bite force distribution on the dental arch during five types of clenching; bilateral, left and right unilateral, and protrusive and retrusive clenching. Bite forces on each mandibular tooth was measured by using pressure sensitive film, “Dental Prescale 50 H, type R”(Fuji Photo Film, Co., Japan), in six normal subjects with natural dentition. The bite force distribution was defined as the proportion of bite force on each tooth to the total bite force.
The proportion of bite force on the tooth located more posteriorly was higher during bilateral clenching. During left and right unilateral clenching, the teeth on the clenching side showed a higher proportion of bite force as compared with that during bilateral clenching. During protrusive clenching, a higher proportion of bite force on incisors, canine, and premolars and a lower proportion on molars were observed as compared with that during bilateral clenching. A higher proportion on the first premolar was observed during retrusive clenching.
These result suggested that constant regularities of bite force distribution associated with clenching types can be recognized and that regularities could be useful guidelines for occlusal diagnosis.

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高分子電解質錯体の補綴領域への応用

高分子電解質錯体とハイドロキシアパタイト顆粒のハイブリッド体の基礎的研究

田口健一

1997 年 41 巻 4 号 p. 645-656
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.645

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The purpose of this study was to investigate whether polyelectrolyte complexes (PECs) could be applied as new biomaterials for jaw reconstruction and bone tissue filling. Among the 90 different PEC combinations available, 32 could be confirmed to exist as gels in solvents with the naked eye, and five of these could be removed from the solvent without losing their shape. The best of these five, 6 X and x-carrageenan were selected, and spherical PEC (PEC ball) were prepared. Their shapes and sizes could be adjusted at will. By mixing these PECs with Hydroxyapatite (HAP) granules, it was possible to produce HAPEC balls. Then these were implanted in rats. Since their shape changed in the subcutaneous tissue, no injurious effects could be detected. HAPEC ball had not broken down 24 weeks later, and no breaking apart, dispersion, etc. of HAP granules was observed. In bone tissue, both PEC ball and HAPEC ball were absorbed and replaced by bone. The findings showed that both PEC ball and HAPEC ball are biocompatible and bioabsorbable. Since PEC also has very high osteoconduction, it appears to be a substance that can be expected to perform well as a biomaterial for reconstructing bone tissue.

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引張試験による金属とポーセレンの接着強さの評価

南弘之, 山邉成志, 嶺崎良人, 倉茂尚徳, 竹之内泰巳, 鬼塚雅, 自見忠

1997 年 41 巻 4 号 p. 657-662
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.657

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Since the introduction of the porcelain fusing technique in dentistry, investigations have been attempted to measure the accurate bond strengths between the dental porcelain and the porcelain fusing alloys. However, it is said that there is no universally accepted test method for measuring the bond strength. The purpose of this study was to evaluate the bond strength by using the tensile test method, expected to enable measurement under uniformly distributed loads along the porcelain-alloy interface.
The conclusions were as follows:
(1) The tensile bonding strength values obtained by using the tensile test method resulted in greater bonding strength and less scattering as compared with conventional test methods.
(2)The mode of bond failure of each specimen was cohesive failure in the body porcelain.
(3)The use of powder-type opaque porcelain significantly decreased the bonding strength in the combination of multipurpose gold alloy and low fusing porcelain as compared with the combinations of conventional fusing alloys and middle fusing porcelain.
(4) The use of paste-type opaque porcelain increased the tensile bonding strength of porcelain. A similar result was obtained from low fusing porcelain.

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咬合異常を訴えた顎機能異常者の心身医学的側面

咬合状態と機能との関連について

屋嘉智彦, 谷田部優, 笛木賢治, 榎澤宗司, 藍稔

1997 年 41 巻 4 号 p. 663-669
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.663

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The purpose of this study was to identify the functional profiles of occlusal disharmony associated with psychosomatic aspects in temporomandibular disorder patients. Thirteen female patients (with a mean age of 47.6 years) who complained of occlusal disturbances and/or occlusal instability caused by past dental treatment were examined before treatment. In addition to undergoing clinical examinations, all patients completed psychometric inventories (CMI, MAS). For functional examination, their occlusal contact areas, occlusal forces, and masseter asymmetry indices (AI) at 50% of maximal voluntary activity of bilateral masseters in the intercuspal position were measured. AI of the occlusal contact area and occlusal force were calculated for further analysis. Moreover, the ranges of tapping points at 4 Hz were quantified and evaluated. Relationships among these values were statistically analyzed.
The results from CMI and MAS showed that 46.2% of the patients had neuroticism and 53.8% had manifest anxiety. Values of occlusal contact area, occlusal force, and each AI were not judged to reflect occlusal instability as a whole. Tapping points were significantly greater in the anteroposterior range (TPAP) than in lateral range (TP-LR)(p<0.05). Statistically significant correlations were found between manifest anxiety and TP-LR (p<0.005). This correlation suggested that manifest anxiety and TP-LR of these patients may influence each other.

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AuCu-Ag擬二元系合金の熱処理が腐食挙動に及ぼす影響

中村茂, 小池麻里, 藤井弘之, 安田克廣

1997 年 41 巻 4 号 p. 670-674
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.670

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From a viewpoint of dental metal allergy, many investigators have paid attention to the influences of metallic materials on the human body. It has also been required to explain the corrosion mechanism and to establish the evaluation method of corrosion resistance for these materials. The purpose of this study was to obtain fundamental data which explain the corrosion behavior of dental alloys.
AuCu-14 at%Ag pseudobinary alloy, simplified component and composition, were heat treated and compared with each datum of corrosion behavior in 1%NaCl solution.
In the potential range of ±0.3 V (vs. SCE), assumed intraoral condition, sample aged at 250°C for 100 ks after solution treatment showed significantly higher corrosion activity than other heat treatment conditions (p<0.001).
The result showed that dissolution of alloy components from the metallic restoration were influenced by heat treatment. Thus it was suggested that anodic polarization measurement could be used as an evaluation method of corrosion resistance for dental alloys.

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浸漬試験によるチタン溶出の評価

小池麻里, 中村茂, 藤井弘之

1997 年 41 巻 4 号 p. 675-679
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.675

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The purpose of this study was to examine the released titanium from casted isolated titanium and casted titanium coupled with other dental alloys (gold, Au-Ag-Pd, and Ag-Sn-Zn alloys) by the immersion test. After 3 weeks of immersion, titanium released into solutions were measured by ICP-AES.
The results were as follows:
1. Titanium released from isolated titanium test pieces in 1.28mM lactic acid were significantly more soluble than that in artificial saliva, saline solution, 1.28mM formic acid, and 1.28mM acetic acid.
2. Titanium released from coupled titanium test pieces in lactic acid were more soluble than that in artificial saliva, saline solution. However, the released amount of titanium in lactic acid seemed to be attenuated by combining with gold, Au-Ag-Pd, and Ag-Sn-Zn alloys.

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コーヌステレスコープ義歯における支台歯と顎堤の荷重分散および床の変位に関する実験的研究

三浦美文, 相澤隆, 松井透, 齋藤正恭, 野谷健治, 川崎貴生

1997 年 41 巻 4 号 p. 680-685
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.680

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The wearing a removable partial denture may cause problems in oral tissues. Some of these problems can be solved by an appropriate distribution of functional forces on the abutment teeth and residual ridges. It is widely recognized that the concept of “rigid support” is effective for proper force distribution. This concept refers to the connection of rigidity in retainers and sufficient support on the residual ridges. The selection of suitable retainers is important for optimum force distribution. The cone-telescopic crown is generally accepted as being the retainer with the greatest connecting rigidity. The purpose of this study was to investigate the characteristics of stress distribution and vertical dislodgement of the denture base of four partial denture designs with cone-telescopic crowns.
The results were as follows:
1. The load distribution under the base of the cone-telescopic crown denture, which has two direct retainers and cross-arch stabilization (=design M1), was the smallest of the four partial denture designs.
2. The apical stress on primary abutment teeth of the cone-telescopic crown denture, which has two direct retainers, was very large.
3. The vertical displacement of the denture base of design M1 was the smallest of the four partial denture designs.

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グミゼリー咀嚼時における咀嚼能率と咀嚼運動の安定性との関係

松尾卓, 志賀博, 小林義典

1997 年 41 巻 4 号 p. 686-697
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.686

ジャーナルフリー

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In this study, the relation between masticatory efficiency and masticatory stability was investigated. Thirty normal subjects were asked to chew gumi-jelly for 20 seconds. The masticatory efficiency was considered to be the amount of glucose discharge. The masticatory stability was considered to be the indicators for the masticatory path and masticatory rhythm of the mandibular incisal point. The relation between efficiency and stability was analyzed quantitatively in two analytical sections, one as the entire 20 second cycle (section A) and the other as the ten cycles beginning at the fifth cycle of mastication (section B). For example, in both section A and section B of the analysis, as the amount of glucose discharge increased, which meant the masticatory efficiency increased, the indicators for the masticatory path and rhythm decreased, which meant that the masticatory stability increased.
Thus it was clear that there was an intimate correlation between masticatory stability and masticatory efficiency and that the correlation was more remarkable in analytical section B than section A. Further it was concluded that the masticatory stability and the masticatory efficiency could be quantitatively estimated by analyzing glucose discharge from gumi-jelly during chewing and by analyzing masticatory stability respectively.

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膜電位からみた象牙質の電気化学的性質について

中川英俊

1997 年 41 巻 4 号 p. 698-709
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.698

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The purpose of this study was to investigate electrochemical properties of human dentin by measuring the membrane potential. The membrane potential was measured in healthy human dentin, human dentin that had been surface-treated, and various other types of dentin, and the transport numbers were obtained.
The conclusions were as follows:
1. The transport numbers obtained by measuring the membrane potential of ion-exchange membranes in potassium chloride and sodium chloride solutions indicated that the experimental apparatus used in these experiments produces accurate data for -1.0-0.48 logarithm of ratio of concentration.
2. The transport numbers obtained by measuring the membrane potential of healthy human dentin in potassium chloride and sodium chloride solutions indicated that healthy human dentin is negatively charged and that human dentin has ion-selective properties.
3. The transport numbers obtained by measuring the membrane potential in human dentin with surface treatment and in various other types of dentin showed that there was no great difference in ion-selectivity. However, a significant difference in ion-selectivity was seen between human dentin treated with tanninfluoride and healthy human dentin.

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ンタルプレスケールを用いた前後的咬合力分布測定に関する模型実験的考察

野村修一, 金谷貢, 河野正司, 加茂剛介, 中野周二, 宮川修

1997 年 41 巻 4 号 p. 710-718
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.710

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Bite force measurement on intercuspal clenching in normal subjects using the pressure sensitive sheet “Dental Prescale” showed that larger bite forces were applied to the posterior teeth than to the anterior teeth. In this study, an experimental model revealed that the even thickness of the pressure sensitive sheet was one of the influential factors in this characteristic distribution.
The experimental model consisted of 14 steel ball-bearings, used as substitutes for the dentition, and a glass slab which were respectively mounted in the maxillary and mandibular elements of a semiadjustable articulator. Three kinds of loading conditions were determined and applied to the upper member with an Instron-type testing machine; then contact forces were compared with the Occluzer FPD-703. Firstly, the upper member was removed from the articulator and the pressure sensitive sheet was loaded directly. Secondly, the condylar elements of the articulator were locked through centric latches, and thirdly, the condylar elements were not locked.
The direct load distributed contact forces almost equally to each steel ball. On the contrary, the load with locked condylar balls distributed larger contact forces to the posterior steel ball-bearings than to the anterior ones. However, the unlocked load showed a similar distribution to the direct load.

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可撤性補綴装置の3次元的挙動

第1報計測システムとその応用

加藤光雄, 笛木賢治, 羽毛田匡, 熊谷靖司, 塩崎智彦, 中村和夫, 藍稔

1997 年 41 巻 4 号 p. 719-728
発行日: 1997/08/01
公開日: 2010/08/10

DOIhttps://doi.org/10.2186/jjps.41.719

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The removable partial denture (RPD) designed without careful consideration shows unfavorable movement in oral cavity during function. It was considered that the RPD designed for minimizing mobility is advantageous for maintaining oral health. However, the actual behavior of the RPD during jaw function is unknown. Therefore, a new measuring system for the dynamic behavior of the RPD was reported.
This system puts the theory of stereophotography in practice. In this study, the three reference points were attached to the RPD with an extension rod. Two sets of subminiature camera were fixed to the patient's head, and the images of the points in each camera were recorded on videotape. Two-dimensional positions of each point was obtained from graphic data processing of stilled images of the recordings. The space coordinates of each point could be calculated from the values of rectangular plane coordinates thereof. By knowing the relation of position of each point, the change of position of any point on the RPD could be measured with time. The results of calibration and some examples were reported in this paper. From the results, though the accuracy was not sufficient, this system was considered to be useful for measuring the dynamic behavior of the RPD.

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