巻号一覧
41 巻 (1997)
- 6 号 p. 874-
- 5 号 p. 747-
- 4 号 p. 525-
- 3 号 p. 357-
- 2 号 p. 165-
- 1 号 p. 1-
前身誌
41 巻, 2 号
選択された号の論文の21件中1～21を表示しています
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小川 真里, 古谷野 潔, 小川 隆広, 末次 恒夫1997 年 41 巻 2 号 p. 165-169
発行日: 1997/04/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of this study was to determine whether or not there was any correlation between canine guidance and condylar paths during mandibular lateral movement. Lateral movements were measured on 40 normal young adults using the six-degrees of freedom mandibular movement analyzing system, and the movement data were analyzed on 75 sides where no balancing-side contacts were observed. Canine guidance was evaluated as the frontal inclination of the working-side canine path at 2.0mm from the intercuspal position. The variables to analyze condylar movement were the anterior, lateral and inferior components of the working-side and balancing-side condylar paths. The results were as follows:
1. There were significant correlations between the canine guidance and the anterior (r=0.59, p<0.0001) and inferior components (r=0.41, p<0.0005) of the working-side condylar path. This indicates that the subject with a steep canine guidance has a large amount of the anterior and inferior components of the working-side condylar path, and that, the subject with a flat canine guidance has a large amount of the posterior and superior components of the working-side condylar path.
2. On the other hand, no significant correlation was found between the canine guidance and any components of the balancing-side condylar path.抄録全体を表示PDF形式でダウンロード (1000K) -
向田 吉範1997 年 41 巻 2 号 p. 170-181
発行日: 1997/04/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of this study was to clarify the relationship between extraordinary occlusal contact and temporomandibular dysfunction (TMD) symptoms. Of 258 persons with and without TMD, the occlusal contacts, in the intercuspal position (ICP), protrusive position and lateral position, the orofacial pain and the articular disk displacement in TM J were recorded, and analyzed by quantification theory II. As for the true rate, F value and discriminative coefficient, the results were as follws:
1. Relationship to Orofacial Pain
1) True rate
The true rate was about 70%.
2) F value and discriminative coefficient
In the ICP, the F value was high at the 2nd molar. In the lateral position, it was high at the working side canine and at the 2nd molar on the balancing side.
2. Relationship to Disk Displacement
1) True rate
The true rate was the highest at the lateral position.
2) F value and discriminative coefficient
In the ICP, the F value was high at the 2nd molar.
In the lateral position, the F value was highest at the working side canine followed by the 1st premolar on the working side in relation to the working and both side disk displacement and the 2nd molar on the balancing side in relation to the balancing side disk displacement.抄録全体を表示PDF形式でダウンロード (3215K) -
還元性雰囲気中における前処理の試み石橋 邦子, 下飛田 淳, 寺田 善博1997 年 41 巻 2 号 p. 182-187
発行日: 1997/04/01
公開日: 2010/08/10
ジャーナル フリーMetal ceramic restorations have been used extensively for several years. A number of alternative noble and base metal alloys for porcelain have become available in recent years, but all of them have disadvantages. Some methods using titanium as a substrate for metal ceramic restoration have been tried because of the desirable properties such as excellent biocompatibility, mechanical properties, good corrosion resistance and relatively low cost. However, some disadvantages arise because of high reactivity of titanium with certain elements, especially oxygen, which makes good bonding to porcelain difficult.
The purpose of this study was to investigate the oxidation on the titanium surface during porcelain firing and to develop better bonding. The heat treatment of the metal in H2 atmosphere before porcelain application had an effect on the bond strength between pure titanium and porcelain. It was considered that the titanium oxide volume should be controlled between the titanium and the porcelain for good bonding.抄録全体を表示PDF形式でダウンロード (4265K) -
竹下 文隆, 鮎川 保則, 伊山 慎二, 曽根 寛之, 末次 恒夫1997 年 41 巻 2 号 p. 188-194
発行日: 1997/04/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of this study was to investigate the tissue reaction to three kinds of membranes, Gore-Tex Augmentation Material (GTAM), Vicryl, and Dura Mater, placed on bone defects around the titanium implants. Nine adult dogs weighing 15kg were used in this study. The dogs were sacrificed either 2, 4, or 12 weeks after placement. Vicryl was exposed 2 weeks after placement. Histologically, it was found that Vicryl was completely resorbed, Dura Mater was replaced with connective tissue at 12 weeks, and bone defects using GTAM and Dura Mater but not Vicryl were partially filled with newly-formed bone tissue. Active bone formation was observed in the space between membranes and pre-existing bone tissue.抄録全体を表示PDF形式でダウンロード (9390K) -
松下 恭之, 竹下 文隆, 末次 恒夫1997 年 41 巻 2 号 p. 195-200
発行日: 1997/04/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of this study was to investigate radiologic, histologic, and ultrastructural findings of a retrieved hollow Bonefit-HC implant that survived for 2 years in the maxilla of a 54-year-old male. A periapical radiograph showed a moderate radiolucency at the cervix. The ultrastructural analysis of the fractured surface disclosed that metal fatigue fracture occurred. Examination of the histological sections disclosed that the remaining hollow portion was completely filled with healthy bone tissue and that the shape of extruding bone tissue was fitted to the ceiling of the other fractured implant. Consequently, the fracture had occurred before implant removal, and the reasons for this fracture were thought to be 1) overloading due to few abutments, 2) excess stress concentration of bending moment to this implant because of lateral guided occlusion and anterior guidance, 3) angulated installation, and 4) its specific open cage-like design.抄録全体を表示PDF形式でダウンロード (8300K) -
表面改質法とフィニッシングライン部形態について小西 洋次1997 年 41 巻 2 号 p. 201-209
発行日: 1997/04/01
公開日: 2010/08/10
ジャーナル フリーThe adhesion between 4-META resin and two kinds of precious metal alloy (Au-Ag-Pd alloy, Type IV gold alloy) treated by six kinds of surface modification methods, Adlloy, M-primer, V-primer, Silicoater, Type I Tin electroplating, and Type II Tin electroplating, was examined in order to find a way to prevent marginal leakage at the finishing line area of precious metal alloy base denture. The adhesiveness was evaluated by the percolation test and the shear bond strength. Two kinds of finishing line type, the buttjoint type and the slope type, were studied by the percolation test after applying these adhesion systems to removable partial denture with precious metal alloy base.
The results were as follows:
1. Precious metal surface modifications by Adlloy surface modification method and Type II Tin electroplating method improved the adhesiveness.
2. Precious metal surface modifications by Adlloy surface modification method and Type II Tin electroplating method were improved the shear bond strength.
3. By Adlloy surface modification method or Type II Tin electroplating method and the slope type finishing line, marginal leakage was prevented.
From the results, it was suggested that marginal leakage in the finishing line area of precious metal alloy base denture could be prevented by the Adlloy surface modification method or Type II Tin electroplating method and the slope type finishing line.抄録全体を表示PDF形式でダウンロード (8694K) -
住吉 圭太, 小川 隆広, 古谷野 潔, 築山 能大, 築山 美和, 小川 真里, 山田 隆司, 市来 利香, 末次 恒夫1997 年 41 巻 2 号 p. 210-215
発行日: 1997/04/01
公開日: 2010/08/10
ジャーナル フリーMany studies have been made on the incisal movement pattern during mastication. However, little information is available concerning the movements of molars, in which area masticatory movement is performed. The purpose of this study was to clarify the distribution of masticatory patterns at each incisal, working-side, and non-working-side molar point, focusing on the relationship among these three points. Masticatory movements were measured on 50 normal young adults using the3-D Mandibular Movement Analyzing System. Computerized analysis was performed and the averaged paths of the incisal, working-side, and non-working-side molars were calculated for each subjects. Each averaged path was divided into four patterns according to the location of opening and closing paths in frontal and sagittal planes, respectively. The frontally-viewed masticatory pattern was the same among incisal, working-side, and non-working-side molars in almost all subjects. On the other hand, the distribution of the sagittally-viewed masticatory pattern was significantly different among incisal, working-side, and non-working-side molars (x2 test, p<0.05). Only 30% of the subjects showed consistent masticatory patterns among these three points.抄録全体を表示PDF形式でダウンロード (1490K) -
龍田 光弘1997 年 41 巻 2 号 p. 216-228
発行日: 1997/04/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of this study was to investigate the influence of unbalanced occlusal contact in intercuspal position on viscoelasticity of the TMJ region. The viscoelasticity of the TMJ region (viscosity: c, elasticity: k, mass: m) was measured using a TMJ viscoelasticity analyzer. Ten healthy volunteers and 28 patients with temporomandibular disorders were selected for experiment 1. The occlusal state was evaluated by add-picture system. The patients were divided into stable and unstable groups between right and left (SGRL and UGRL) with an asymmetry index of the occlusal area. Ten healthy volunteers were selected for experiment 2. Balanced and unbalanced occlusal contacts were applied by occlusal appliances, and volunteers were asked to clench for 1 minute. The viscoelasticity of the TMJ region was measured using TMJ viscoelasticity analyzer before clenching, immediately after and 2, 5, and 10 minutes after clenching.
In experiment 1, the viscoelasticity in UGRL was statistically higher than that in SGRL in c, and in the healthy volunteers and SGRL in k. In experiment 2, there was no variation in the balanced group. k was statistically varied before and after clenching in the unbalanced group. Reduced and increased values were observed immediately after and 2 minutes after clenching in anterior-posterior and right-left unbalanced occlusal contact, respectively.抄録全体を表示PDF形式でダウンロード (5965K) -
松崎 大助, 楠本 直樹, 乾 善彦, 中野 浩, 中野 環, 加藤 佳奈子, 山田 真一, 川村 邦雄, 名越 弌彦, 高島 史男, 丸山 ...1997 年 41 巻 2 号 p. 229-236
発行日: 1997/04/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of this study was to investigate form of chewing path and rhythm of chewing movement in patients with osseointegrated implant full bridge.
Chewing movement was recorded and analyzed with Sirognathograph Analyzing System III. Thirty patients with osseointegrated implant full bridges, ten subjects with natural teeth, and ten patients with full dentures were selected for this study.
The results were as follows:
1. Rhythm of chewing movement
Closing time, cycle time, and ratio of closing time to cycle time in patients with osseointegrated implant full bridges were longer than those in subjects with natural teeth, and shorter than those in patients with full dentures.
Stability in patients with osseointegrated implant full bridges was slightly inferior to that in subjects with natural teeth and superior to that in patients with full dentures.
2. Form of chewing path
Opening amount in patients with osseointegrated implant full bridges was nearly equal to that in subjects with natural teeth and greater than that in patients with full dentures.
Variation to working side and posterior of turning point in patients with osseointegrated implant full bridges and in patients with full dentures were smaller than those in subjects with natural teeth.
Stability in patients with osseointegrated implant full bridges was nearly equal to that in subjects with natural teeth and in patients with full dentures.抄録全体を表示PDF形式でダウンロード (7087K) -
構成因子の抽出および義歯の受容との関連性山本 公洙1997 年 41 巻 2 号 p. 237-246
発行日: 1997/04/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of this study was to find factors related to patients' evaluative attitudes toward dentures or denture wearing, to investigate construct validity and relation to denture acceptance. The subjects were 263 patients, who visited The School of Dentistry of Aichi-Gakuin University. They were given a questionnaire concerning their opinions and feelings about dentures or denture wearing, and a few items asking the patients' satisfaction with their dentures. Their psychological tendencies were evaluated by Yatabe-Guilford Personality Inventory and Cornell Medical Index.
To find factors of the patients' evaluative attitudes, the principal factor solution with varimax rotation was applied.
The results were as follows:
1. Three factors found by factor analysis were as follows: F-1 (usefulness), F-2 (comfort), and F-3 (anxiety).
2. There appeared to be a relationship between patients' evaluative attitudes and their sex, denture experience, and age. These results indicated construct validity of their attitude items.
3. A low relationship was found between the patients' personality and the second factor, namely, comfort.
4. Significant correlation was found between the patients' satisfaction with their dentures and each of the found factors. The correlation coefficients were as follows: usefulness (0.37), comfort (-0.38), and anxiety (-0.20).
5. It can be concluded that the patients' evaluative attitudes were quantitatively measured and important to denture acceptance.抄録全体を表示PDF形式でダウンロード (2119K) -
名木田 律子, 吉峰 茂樹, 澤田 萬喜子, 菊池 真理, 木村 卓哉, 寺村 薫, 楫野 泰弘, 竜門 宏, 兼平 治和, 前田 照太, ...1997 年 41 巻 2 号 p. 247-251
発行日: 1997/04/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of this study was to clarify the factors increasing blood flow in oral mucosae after mastication. Blood flow in palatal mucosae was measured by laser Doppler flowmeter in six subjects immediately after gum chewing and opening and closing movements without tooth contact and body exercises. Blood flow was gradually and significantly increased after gum chewing on both the gum chewing side and the opposite side. Blood flow was increased by body exercises and opening and closing movements without tooth contact. The time course of change was different.
These findings suggested that the increase of blood flow immediately after mastication is caused by not only mechanical stimulation or muscle activities during mastication but also mandibular movements or body exercises.抄録全体を表示PDF形式でダウンロード (2923K) -
VII-3. 筋放電活動の非対称性指数と正貌顎顔面形態および偏側咀嚼指数との関連性加納 昭彦1997 年 41 巻 2 号 p. 252-260
発行日: 1997/04/01
公開日: 2010/08/10
ジャーナル フリーIn this study, in order to investigate the association between frontal dentoskeletal form and the lateralized mastication index and masticatory EMG activity, the frontal form of 18 subjects who belonged to the normal face group was classified into left and right deviation groups, and the mechanisms of jaw function were analyzed by the lateralized mastication index and the asymmetry index of masticatory muscle EMG activity, and by investigating the associations by classifying the magnitude of bite force into 4 grades, the following conclusions were obtained.
1. Correlation between the asymmetry index of masticatory muscle EMG activity and frontal dentoskeletal form
Significant positive correlations were found in both groups in the posterior temporalis muscle with 100% MC for Me-ML, in the left deviation group with 75% MC for Me-ML, and in the right deviation group for the ∠Um-Um′. In the masseter muscle, there were significant positive correlations in both groups with from 50 to 100% MC for the ∠Um-Um′, 75 and 100% MC, respectively, for the ∠CG-Me, and 100% MC for Go-MLGo′ and Me-ML, and in the left deviation group, with 50% MC for Me-ML. Significant negative correlations were observed in the anterior temporalis muscle in both groups with 100% MC for the ∠Um-Um′ and Me-ML, and in the right deviation group with 75% MC for the ∠Um-Um′.
2. Correlations between the asymmetry index of masticatory muscle EMG activity and the lateralized mastication index
Significant positive correlations were found with 25% MC for the posterior temporalis muscle in the right deviation group and with 25 and 50% MC, respectively, for the masseter muscle in the two groups.
Significant negative correlations were found with 25% MC for the anterior temporalis muscle in both groups.抄録全体を表示PDF形式でダウンロード (2092K) -
岩堀 正俊, 山内 六男, 堺 誠, 浅野 彰夫, 岸井 次郎, 澤田 尚昌, 長澤 亨1997 年 41 巻 2 号 p. 261-265
発行日: 1997/04/01
公開日: 2010/08/10
ジャーナル フリーAbrasion of denture base resin by dentifrice manufactured for dentures was compared with that by ordinary tooth paste.
Denture base samples were prepared using microwave-polymerized base resin. Using a brushing abrasion tester, the samples were brushed one hundred thousand times to determine the amount of abrasion and the surface roughness. SEM observation was also carried out. In addition, the X-ray diffraction and thermal weight of the dentifrice were measured.
Brushing with the dentifrice for dentures resulted in a larger amount of abrasion compared to the ordinary tooth paste. Thus denture base resin was found to be liable to be abraded by brushing with the dentifrice manufactured for dentures. SEM observation and measurement of the surface roughness demonstrated that the surface of denture base resin underwent large changes by brushing with the dentifrice manufactured for dentures.
The results of this study by SEM observation, X-ray diffraction measurement, and thermal weight measurement suggested that the difference in abrasiveness was due to the differences in the kind and grain size of the polishing material contained in dental paste.抄録全体を表示PDF形式でダウンロード (5678K) -
山瀬 勝, 新谷 明喜, 横塚 繁雄1997 年 41 巻 2 号 p. 266-277
発行日: 1997/04/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of this study was to examine the influence of various thicknesses of opaque and dentin porcelain on the color of ceramometal restorations. A spectrophotometer was used to measure the color of the specimens and the color differences were calculated to determine the masking effect on the metal base color. The masking effect of the opaque porcelain (Vita shade A 1) fired on seven commercial ceramic alloys was different for each alloy. 86.5%-gold-content alloy specimens with 0.3-mm thickness of opaque porcelain demonstrated the maximum masking effect of the opaque single-layer. The masking effect of the opaque-dentin double-layer specimens was different for thickness and shade of porcelain. Palladium-silver alloy specimens with 0.2-mm thickness of opaque porcelain and 1.2-mm thickness of dentin porcelain demonstrated the maximum masking effect of double-layer of shade A 1. 52.5%-gold-content alloy specimens with 0.2-mm thickness of opaque porcelain and 1.2-mm thickness of dentin porcelain demonstrated the maximum masking effect of double-layer of shade C4.抄録全体を表示PDF形式でダウンロード (2777K) -
第1報上顎中切歯部呼気圧との関連森川 葉子, 市川 哲雄, 松本 直之1997 年 41 巻 2 号 p. 278-285
発行日: 1997/04/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of this study was to investigate the influence of anterior palatal form on air pressure during the production of /sa/, /si/, /ta/ and /ci/. The subjects used were 5 male 3 female edentulous patients, whech were native Japanese speakers. Each experimental maxillary denture was fabricated and four experimental thicknesses were defined as a function of alteration in the anterior palatal counter of complete denture. The tip of aluminum tube was placed in artificial incisor teeth and the other tip was connected to a differential micropressure transducer. Air pressure and the speech signal were recorded by a digital data recorder during speech production.
The results were as follows:
1. Air pressure signal in each sound was characterized by the number of peaks and the time relationship to speech signals.
2. The anterior palatal form of complete denture had little influence on the time relationship between the peak of air pressure and speech signals.
3. The peak value of air pressure ranged between 100 and 700 Pa in /sa/, 100 and 500 Pa in /si/, 50 and 600 Pa in /ta/, and 50 and 700 Pa in /ci/. The peak values of air pressure were different among the subjects. Four experimental anterior palatal forms significantly affected peak values of air pressure (ANOVA, p<0.05).
It was concluded that the anterior palatal form of complete denture affected the air pressure flown out from the upper central incisors.抄録全体を表示PDF形式でダウンロード (1767K) -
杉沢 肇, 中本 宏, 長光 靖夫, 佐藤 友彦, 五十嵐 孝義, 掛谷 昌宏, 西山 實1997 年 41 巻 2 号 p. 286-291
発行日: 1997/04/01
公開日: 2010/08/10
ジャーナル フリーIPS Empress® is a system for producing all-ceramic dental restorations by a heat-press molding method.
The dimension and the inside surface texture of the mold due to special phosphate bonded investments directly influence the fit of restorations. Therefore, the L/P ratio and the dilution ratio of the special liquid containing colloidal silica are indicated for each type of restoration. The purposes of this study were to measure the setting and thermal expansion of two types of investment mixed according to indicated conditions and to observe the surface texture of the mold of investment by scanning electron microscopy, because the irregularities of ceramic surface are occasionally found after molding.
Results: 1. The setting and the thermal expansion of investment for the staining technique had a tendency to become bigger in proportion to the increase of the special liquid. 2. The total value of setting and thermal expansion of the investment for the staining technique was within the range of 1.36-1.53%, and the thermal expansion was 80% of the total value. While the value of the investment for the layering technique was 1.96%, and there was no significant difference between the two values of setting and thermal expansion. 3. There was no significant difference between the two preheating methods. 4. The irregularities existing on the ceramic surface after pressing was due to the porous surface of the investment mold.抄録全体を表示PDF形式でダウンロード (5695K) -
大倉 一夫1997 年 41 巻 2 号 p. 292-301
発行日: 1997/04/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of this study was to investigate biological signals during sleep associated bruxism. All night polysomnographic measurements were performed for twenty volunteers (mean age: 30.3 yrs, SD 5.7) at home. Polysomnographic data, involving masseter EMG, EEG, ENG, ECG, respiration and jaw movement was recorded using the multi-telemeter system.
Bruxism episodes were basically defined as elevation of masseter EMG activities above 5% MVC and then classified into clenching and grinding types due to their EMG and jaw movement patterns. The results were as follows:
1. The mean number of bruxism episodes was 38.7 per night, 6.1 per hour. The mean duration of bruxism was 8.8 sec, peak activity was 35.0% MVC and accumulated activity was 110.6% MVC·sec. Positive correlation was observed among duration, peak activity and accumulated activity of bruxism episodes (p<0.01).
2. Masseter muscle activity patterns during bruxism episodes did not always correspond to jaw movement patterns during episodes.
3. The sleep stage generally tended to rise lighter after bruxism episodes. The highest frequency of bruxism episodes was observed during sleep stage 2 followed by sleep stage REM, stage 1 and stage 3 in that order. No bruxism episode was observed during sleep stage 4.
4. Heart rate was gradually increased before a bruxism episode. The maximum heart rate was observed right after bruxism episode and then generally decreased thereafter.抄録全体を表示PDF形式でダウンロード (5528K) -
虫本 栄子, 田中 久敏, 井上 大一, 高間木 祐一, 長谷 剛史1997 年 41 巻 2 号 p. 302-311
発行日: 1997/04/01
公開日: 2010/08/10
ジャーナル フリーIt has been said that long-term denture wearers often undergo facial changes as a result of not only occlusal wear of the dentures and residual ridge resorption but also masticatory dysfunction. However, there are no references regarding analysis of morphological change in relation to the functional masticatory muscle activity which is fundamental to an understanding of maxillomandibular relation.
The purpose of this study was to investigate whether or not a method of mandibular repositioning that changes the facial skeletal structure can correct mandibular dysfunction. Sixty patients were examined who required denture renewal. Diagnosis of these patients was made, and a clinical method, following standardized treatment, was determined for obtaining correct mandibular position. Patients were evaluated before and after treatment using lateral and P-A cephalogram, transcranial TMJ radiograph, and EMG for bilateral coordination patterns of masticatory muscles.
The results were as follows:
1. In long-term use of complete dentures, there was a loss of occlusal vertical dimension and the mandible rotated counterclockwisely resulting in an increase in relative prognathism.
2. Loss of occlusal vertical dimension coupled with a habitually protruded mandible was corrected by sufficient clinical procedure to correct jaw relation.
3. Mandibular function could not be achieved without correction of the facial skeletal structure.抄録全体を表示PDF形式でダウンロード (2207K) -
総義歯咬合再構成に及ぼす影響井上 大一1997 年 41 巻 2 号 p. 312-323
発行日: 1997/04/01
公開日: 2010/08/10
ジャーナル フリーThere has been no cephalometric study of complete denture wearers that clearly distinguishes those persons with internal derangement of temporomandibular joint from those with normal disk position in relation to mandibular function.
Out of a total of sixty complete denture wearers, eighteen patients with normal temporomandibular joint (TMJ) were compared to forty-two patients with documented TMJ internal derangement.
The group with internal derangement of TMJ was divided into two groups, one with reduction of disk displacement (twenty-five patients), and the other without reduction of disk displacement (seventeen patients). The patients in these two groups were examined using Magnetic Resonance Imaging (MRI).
Lateral, P-A cephalogram, transcranial TMJ radiograph, EMG, and SGG were used to investigate the relationship between TMJ disk displacement and facial skeletal structure and mandibular function. The results were as follows:
1. A desirable and functional centric relation could not be achieved among asymptomatic patients with internal TMJ derangement.
2. Asymptomatic patients with internal derangement when recording maxillomandibular relation demonstrated considerable variation in the width of the space between the condyle and the fossa and mandibular lateral deviation.抄録全体を表示PDF形式でダウンロード (3214K) -
西川 敏文1997 年 41 巻 2 号 p. 324-334
発行日: 1997/04/01
公開日: 2010/08/10
ジャーナル フリーThe methods of creating inferior traction on a unilateral condyle using bilateral and unilateral bite plates on the molars and unilateral pivot were examined. Different patterns of mandibular displacement were also examined, i. e., voluntary clenching, manual unilateral elevation of the mandible, and unilateral and bilateral myo-monitor pulse stimulation (myo-pulsing). Displacement of the condyle was measured with a computerized axiograph.
Inferior traction on a condyle did not arise during voluntary clenching with the pivot or either of the bite plates. Voluntary clenching apparently caused the condyle to be pressed anterosuperiorly against the glenoid fossa. Manual unilateral elevation with the pivot created inferior traction of the condyle (1.3-1.4mm) on the pivot side but superior movement (0.9-1.0mm) also caused the condyle to be pressed against the glenoid fossa on the contralateral side. Plate side pulsing created inferior traction on the contralateral condyle without creating pressure on the pulsing side both with and without bite plates. Then non-plate side pulsing created inferior traction on the contralateral condyle without creating pressure on the pulsing side.
In conclusion, unilateral myo-pulsing with the pivot or the unilateral bite plate was the most effective for creating the inferior traction effect on the contralateral condyle, while voluntary clenching was ineffective.抄録全体を表示PDF形式でダウンロード (2485K) -
シミュレーションモデルによる検討松本 直之, 河野 文昭, 永尾 寛, 多田 望1997 年 41 巻 2 号 p. 335-346
発行日: 1997/04/01
公開日: 2010/08/10
ジャーナル フリーThe posterior artificial teeth form and occlusal scheme are the some of the important factors improving the denture stability and function. The effect of the artificial posterior teeth form and occlusal scheme on the pressure distribution on the complete denture supporting structure during simulated mastication was investigated by using upper and lower edentulous simulators. In this report, a guideline for the selection of posterior artificial teeth for complete denture, based on our previous investigation, was studied.
1. The lateral wing inclination of the incisal guide table of semi-adjustable articulator, and occlusal form and scheme of posterior articulator hardly affected the pressure distribution on supporting tissues under complete denture in centric occlusion.
2. When lateral mastication was simulated, the lateral wing inclination of the incisal guide table of semi-adjustable articulator, and occlusal form and scheme of posterior articulator affected the pressure distribution on supporting tissues under complete denture in centric occlusion.
3. The guidelines in consideration of the denture stability were as follows:
1) In the case of the patient who had good upper and poor lower alveolar ridges, full balanced occlusion with Livdent teeth should be set in his/her complete denture.
2) In the case of the patient who had poor upper and lower alveolar ridged, lingualized occlusion should be set in his/her complete denture.
3) In the case of the patient who had poor upper and good lower alveolar ridges, Bio-Ace teeth should be selected rather than Livdent teeth in his/her complete denture fabrication.抄録全体を表示PDF形式でダウンロード (2818K)
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