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硬質レジン歯の応用について
田中 卓男, 松村 英雄, 熱田 充, 島川 周三
1994 年 38 巻 3 号 p.
507-514
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
In case of temporary treatment of missing teeth, resin teeth are fixed adhesively to the remaining adjacent teeth as pontic using self-curing resin. The improvement of adhesion technique recently has brought a longer period of service to this prosthesis. However, the elongation of periodin service provoked the serious abrasion of resin teeth, which caused the complete loss of anatomicform. The most effective method to prevent the abrasion is the use of composite resin teeth.However, the labial surface of the tooth is constructed with highly crosslinked polymer, and it isdifficult to achieve the durable bond with adhesives.
In this study, bonding of composite resin teeth were evaluated with three kinds of treatedsurfaces and two self-curing resin adhesives. Adhesion specimens were constructed and a shear testwas performed after 20, 000 thermocycles.
For two types of composite teeth with untreated surface, separation occurred during thermocycling.Trial composite tooth showed bond strength of 14.3 MPa after thermocycling. Aluminablasting treatment improved the adhesiveness effectively, giving the highest bond strength of 30.6MPa between Superbond C & B and trial composite teeth. Superbond C & B showed higher bondstrength than traditional BPO-amine self-curing resin.
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関田 俊明, 水口 俊介, 平野 恭吉
1994 年 38 巻 3 号 p.
515-522
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
Movements of soft tissues surrounding the oral cavity, especially lips and cheeks, have a great influence on the masticatory and the phonetic functions. These movements can indicate the state of harmony between a denture and the soft tissues surrounding it.
The purpose of this study was to develop a real-time measuring system for three-dimensional movements of soft tissues. This system consists of two Video Trackers, which are placed stereographically and provide two-dimensional data of the movement. Three-dimensional coordinates of movements in points can immediately be calculated by a computer. We examined the accuracy of this system using the computerized XYZ pulse stage.
The result was as follows:
The resolution of the measuring system was 0.10×0.10×0.10 mm. The measurement was carried out in the area of 24.0 (x)×20.0 (y)×20.0 (z) mm with the working distance of 500 mm and with the frequency of 120 H
z.
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松井 浩
1994 年 38 巻 3 号 p.
523-533
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
This paper reveals the intercorrelationship between the segmental points of the bottom curve on the maxillary sinus and the various measuring points in the craniofacial skeletal complex.Lateral Cephalometric Roentgenogram was used as the analytic object in the status of Denture Wearer's Centric Occlusions. Landmarks and points of the lowest position of the sinus bottomswere consisted by six anterior points [e.i. L (-1)-L (-6)] and six posterior points [e.i. L (1) L (6)] of Z-point (Fig. 1). Morphology of the sinus bottom was categorized into two types, onewas the shallow and sloped, the other was the deep and flat. The lowest points of the sinus bottomwere generally distributed about 10 mm. Distance was wide at the malomaxillary suture.Craniofacial skulls were divided into twenty-nine landmarks and points after Downs and Ricketts, and Multivariate statistic analysis was adapted in the research. Canonical correlation coefficientsbetween maxillary sinus data and maxillary bone construction were 0.793, and those between themaxillary sinus data and craniofacial complex were 0.965. Vertical heights of the edentulouspersons were prosthetically predictable as linear regression problems by the maxillary sinus data asindependent variables.
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堀内 政信, 市川 哲雄, 森川 葉子, 薦田 淳司, 堀坂 寧介, 松本 直之
1994 年 38 巻 3 号 p.
534-539
発行日: 1994/06/01
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 palatal form changing with the position of upper posterior artificial teeth on tongue movement for pronunciation of /s/sound. Subjects were seven males and speech material was /asa/. Two experimental palatal plates were made for each subject: a normal 1.5-mm-thick plate and the plate augmented by a 4-mm-thick lateral seal of palatal surface. Tongue-palatal contacts were measured by a dynamic palatography when wearing either of the two plates. The influence of the palatal form was estimated using the following parameters: the onset of the tongue-palate contact, maximum contact speed, the timing of the constriction for /s/, and palatogram pattern at the constriction and consonant duration for /s/.
The speech behavior when wearing the augmented plate was divided into 4 groups comparing to normal plate:
Group 1: Tongue-palate contact started earlier, maximum contact speed decreased and the timing of the constriction was constant.
Group 2: The onset of tongue-palate contact and maximum contact speed were constant. Butthe timing of the constriction was delayed.Group 3: Tongue-palate contact started earlier, maximum contact speed decreased and thetiming of the constriction was delayed.
Group 4: Temporal aspect of tongue-palate contact was constant. But the consonant durationwas shorter and abnormal palatogram pattern was observed.
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島田 卓也, 倉知 正和, 加藤 泰二, 木村 拓郎, 宇野 光乗, 山田 早苗
1994 年 38 巻 3 号 p.
540-547
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
The present study was conducted to examine the parameters involved in learning how to speak again after the insertion of an experimental palatal full plate.
The study included nine words that have the/sa/sound at the beginning of words and that havea partially common phonemic composition with different numbers of total syllables. Five subjectspracticed utterance 13 times after the insertion of the plate. The utterance duration measured fromsound samples on a sonagram were used as the data base. Change aspect of utterance duration wasobserved after numerous utterances.
The results of the study suggest the possibility that the progress of learning tospeak after theinsertion of the plate can be determined by measuring the duration of the sound /sa/ at the beginningof words.
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貞光 謙一郎
1994 年 38 巻 3 号 p.
548-559
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
This paper describes a study conducted to thermographically analyze facial temperatures and to apply the analyzed results to the examination and diagnosis of stomatognathic functions in prosthodontics. First, I examined temperature distribution at several locations on the face of persons at rest whose stomatognathic systems were normal.
These distributions were then compared with the temperature distributions of persons with mandibular dysfunction, and studied for possible use of thermograms to distinguish the two groups.
Thermograms of facial temperature at rest revealed that the facial temperatures of persons with normal stomatognathic systems varied greatly according to sex and showed marked individualcharacteristics. In individual subjects, temperatures were high in the temporal muscle, but no large differences were seen in any of the other four measurement sites or between the habitual and non -habitual sides. Thus a characteristic distribution was demonstrated.
The distribution of facial temperature among persons with mandibular dysfunction differed slightly from that of persons with normal stomatognathic systems.
These experimental results suggested that facial temperature thermography can be useful in prosthodontics.
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第1報 溶込み形状と金属組織
柿本 和俊, 小正 裕, 権田 悦通
1994 年 38 巻 3 号 p.
560-570
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
The purpose of this study was to apply pulsed YAG laser welding to the joining of dental prosthesis made of pure Ti, Ti-6 Al-4 V or Ni-Ti. In this paper, we investigated the effects of laser irradiation conditions on the geometry of penetration. Additionally, we evaluated weldability of these materials by microscopic observation and X-ray diffraction method.
A decrease in the defocused distance brought the increase in penetration depth. Under the conditions that the geometry of weld fusion zone was the key-hole type, the penetration depth increased significantly with decrease in defocused distance. It was possible to produce a spot weldof 1.6 mm in depth. Under the conditions that a laser beam was delivered through SI-fiber, thepenetration was less than the case without SI-fiber.
The laser weld fusion zones of pure Ti and Ti-6 Al-4 V exhibited columnar structure andacicular microstructure, respectively. The laser weld fusion zone of Ni-Ti exhibited the microstructurein which eutectics existed at cell and grain boundaries, and the crystal structure was mainlymonoclinic. Concerning Ni-Ti, there were cracks at the grain boundary of the fusion zone.Consequently, the weldability of pure Ti and Ti-6 Al-4 V were judged to be good. However, furtherstudy of prevention of cracking was necessary in laser-welded Ni-Ti.
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小久保 裕司, 坪田 有史, 小林 和弘, 福島 俊士
1994 年 38 巻 3 号 p.
571-576
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
In this study, human dentin, composite core resin and dental alloy (Ag-Pd-Cu-Au) were bonded to the stainless steel by two kinds of adhesive cements and a glass ionomer cement. The adhesive strength of each specimen was measured after 24 hours (thermocycle 0) and after thermocycling 5, 000 times as well and compared with one another.
Furthermore, the influence of pretreating agent on adhesive strength to the composite core resin and the dental alloy was examined.
The following results were obtained;
1. Panavia 21 exhibited high early bond strength and stable durability to the human tooth andthe dual-cured composite core resin comparing with the other cements.
2. Super bond C & B showed high early bond strength to the human tooth, the dual-curedcomposite core resin and the Ag-Pd-Cu-Au alloy, but its durability was very poor.
3. After applying pretreating agent, the durability of Panavia 21 to the Ag-Pd-Cu-Au alloydecreased remarkably.
4. Fuji BOND indicated low early adhesive strength and very poor durability.
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第6報: 耳介エピテーゼの維持源としての応用
大久保 肇, 新美 敦, 山本 浩貴, 日比 英晴, 澤木 佳弘, 上田 実, 金田 敏郎, 鳥居 修平, 林 祐司
1994 年 38 巻 3 号 p.
577-582
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
Auricular epithesis supported by osseointegrated implants was fabricated for a patient with traumatic auricular defect. The sites of fixture insertions were different from those of reportsin Sweden. And we inserted three fixtures to improve the prognosis of the retention for epithesis.The retention by osseointegrated implants was sufficient for auricular epithesis, and marginal blockwas almost perfect. From these results, auricular efithesis supported by osseointegrated implantsis an available alternative to surgical reconstruction, and in cases of traumatic defect it could bebetter than surgical reconstruction.
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第2報顆頭および大臼歯の運動速度と切歯の運動速度との関係
築山 能大, 古谷野 潔, 末次 恒夫
1994 年 38 巻 3 号 p.
583-587
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
The speed analysis of mandibular movement is one of the most useful methods which give important information in evaluating stomatognathic function. The purpose of this study wasto clarify the relations between the speed of incisor, molars and condyles during jaw opening andclosing movement. Mandibular movements were measured with Kyushu University 3-D movementanalyzing system in 40 normal subjects then the speed was calculated.
The following results were obtained:
1. There were correlations between the maximum speed of condyles and molars and themaximum speed of incisor.
2. The maximum opening speed of incisor, molars and condyles were observed at the incisalpoint opening of 32.46, 29.99, 59.96% of the maximum opening distance respectively. The maximumclosing speed of incisor, molars and condyles were observed at the incisal point opening of63.75, 59.08, 64.43% respectively.
3. In the opening movement, 1 St molars movement reached maximum speed first, next incisalpoint, then condyles. In the closing movement, there were no remarkable differences among thethree analyzing points.
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松田 もと子, 永井 成美, 折笠 史明, 多田 建造, 辰巳 浩輝, 藤原 麻紀, 古川 良俊, 岩橋 寛二, 井上 昌幸
1994 年 38 巻 3 号 p.
588-595
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
Patch tests have been used to determine the existence of metal allergy, and its severity was ascertained by the change in skin color. However, it was quite difficult to accurately assess the change in skin color at times. Therefore, a new colorimetric diagnostic system capable of objectively evaluating color was developed to overcome this problem. This was made possible with the aid of a computer and spectrophotometer capable of making longitudinal colorimetric studies and analyses. When this new diagnostic approach was compared to the conventional subjective one, the following characteristics were obtained for positive testing ones:
1. Spectral reflectance curve was of the absorption type.
2. Depth of shade (Labe θ) increased.
3. A high color difference (dE) value was observed.
4. According to the Munsell system, the hue moved toward YR.
5. Lightness decreased and there was no change in chromaticity.
6. According to the CIELAB color system, there was a decrease in L*, an increase in a, and a decrease in b*.
In conclusion, characteristics of this new objective approach showed significant differences in dE, spectral reflectance curve, Labe θ, and L*, a*, b*, and Lightness when comparing the negative and positive groups.
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特にコラーゲン製材の効果について
田口 直幸, 草刈 玄, 高野 吉郎
1994 年 38 巻 3 号 p.
596-610
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
The effect of an application of collagen material to bone defects and spaces created by polytetrafluoroethylene (PTFE) membranes was examined in rat parietal bones.
Eighty Wistar rats (12 weeks old) were divided into 2 test groups, and a pair of rounded cavities drilled in the parietal bones of each rat.In one group, one of the cavities was filled with collagen material, the other was left untreated and simply covered by skin flaps.In another group, cavities with or without collagen material were covered by a PTFE membrane spacer for bone augmentation.
Wound healing and bone formation (1-56 days) were evaluated histologically in both groups and the following results were obtained:
1.Collagen material in cavities accelerated formation of distinct fibrin networks, leading to granular tissue formation and subsequent enhanced osteogenesis.
2.An application of collagen material to the secluded spaces for bone augmentation also facilitated formation of extensive fibrin networks throughout the spaces and granular tissue formation much earlier than in the controls.
Collagen material applied into spaces provided by PTFE membranes promotes bone augmentation indirectly by facilitating granular tissue formation, thereby minimizing chances for infection.
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虫本 栄子, 田中 久敏, 吉田 光宏, 黒田 直寿, 佐藤 博, 菅原 光孝
1994 年 38 巻 3 号 p.
611-620
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
Criteria for selection of removable partial denture abutment teeth is broad, depends upon many factors, and its estimation of prognosis there by is difficult. In order to establish diagnostic parameters, the degree of tooth quality must be determined.
The aim of this study was to test via statistical analysis those factors which can affect tooth quality, and provide risk factors influencing removable partial denture abutments.
Subjects including patients requiring extractions of abutment teeth were divided into two groups of vital and nonvital teeth. Data was collected based on clinical examinations, and assigned to various categories of factors.
In the vital group, factor contribution to poor prognosis included periodontal condition, bone resolution, pocket depth and CPITN, which proved to be significant risk factors. In the nonvital group, biomechanical factors, such as occlusal and prosthesis factors, were shown to be significant risk factors.
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吉田 光宏
1994 年 38 巻 3 号 p.
621-635
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
In order to establish diagnostic parameters for the estimation of prognosis of abutment teeth in removable partial denture, the degree of tooth quality must be determined.
Clinical factors which affect the shortened life span of abutment teeth in removable partial denture were investigated by use of statistical analysis, biomechanically and histopathologically.
Subjects included patients requiring extraction of abutment teeth, were divided into two groups of vital and nonvital teeth.
Data was collected based on clinical examinations assigned to three categories such as periodontal condition factor, occlusion factor and prosthesis factor.
The following results were observed in the nonvital group: biomechanical factors such as occlusal and prosthesis factors were shown to be significant risk factors in which affected the shortend life span of RPD abutment teeth by statistical analysis, tooth quality was weakened, and bacterial contamination within enamel of root canal surfaces was observed by electromicroscopy.
In contrast, vital group factor contribution to poor prognosis included periodontal condition such as pocket depth and CPITN, which proved to be a significant risk factor.
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石島 勉, 広瀬 哲也, 平井 敏博, 青木 聡, 雪野 英一郎, 渡部 茂
1994 年 38 巻 3 号 p.
636-643
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
The amount and consistency of saliva affect the retention of removable dentures and the comfort with which patients can wear them. Recently, SST
(®) (Salix Saliva-Stimulating Tablet) has developed as a saliva stimulating agent for the patients with dry mouth. In this paper, efficacies of SST
(®) for dry mouth were clinicaly evaluated.
The whole salivary secretion in ten minutes was analized in 8 complete denture wearers with normal salivary secretion (normal group; 77.1±7.2 yrs.) and 10 removable denture wearers who complained of dry mouth (dry mouth group; 79.0±7.1 yrs.). Then 19 removable denture wearers who complained of dry mouth (trial use group; 79.5±6.8 yrs.) were surveyed for the clinical evaluation of SST
(®) by the questionnaire before and after one-week trial use of SST.
(®) The results were as follows:
1. The unstimulating whole salivary secretion in ten minutes were 0.88ml in the normal group and 0.21 ml in the dry mouth group.
2. High secretion rate was shown by taking SST
(®) in both groups with statistical significant (normal group: p<0.02, dry mouth group: p<0.01).
3. In 18 of 19 subjects (trial use group) answered relief from dry mouth after one-week trial use of SST
(®) .
4. The average dosage of taking SST
(®) was 2.5±2.3 tablets per day.
These results suggest that SST
(®) is clinicaly effective for the patients suffering from dry mouth.
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岡部 良博, 谷田部 優, 佐藤 雅之, 榎澤 宗司, 安田 登, 藍 稔
1994 年 38 巻 3 号 p.
644-648
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
A new bonding liner which can bond the low irritation relining material (METABASE M) to the metal base has been developed. Compositions of the liner are 4-META (2%), polyfunctional methacrylates (5%), methylemethacrylates (10%) and soft vinyl polymers (about 20%) dissolved in acetone. Bonding tests and dye penetration tests of METABASE M using the new bonding liner Co-Cr alloys have been carried out.
Adhesive strength of the METABASE M showed 14.3±1.8 MPa after 24-hour immersion in 37°C water and 8.3±0.9 MPa after 1, 500 thermal cycles.
The amount of dye penetration between resin and metal was much more in case of the thin resin layer than the thick layer. It was found that the new liner had excellent bonding strength to the metal base and the degree of polymerization was closely related to the bond strength.
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山村 善治, 倉知 正和, 木村 拓郎, 山田 早苗
1994 年 38 巻 3 号 p.
649-654
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
The present study was to determine the fluctuation patterns in the path and activity of masticatory muscle during chewing masticatory movements in three groups of subjects having different degrees of persistent lateralized mastication (expressed as a lateralized mastication index): group I (mild), group II (intermediate), group III (severe).
With regard to the standard deviation of each parameter, N-HM mastication showed a greater variance than HM mastication in all three groups.
The difference between the sides of mastication was the smallest in group I and the largest in group II.
Furthermore, the number of subjects showing such a relationship was the smallest for most parameters in group I and the largest in group III. Subsequently, the interdependent relationship of the course and masticatory activity was examined by the first canonical correlation coefficient of canonical correlation analysis. In HM mastication, all three groups showed practically equal correlation coefficients of 0.87-0.88.
In addition, the subjects in group I showed little or no difference between the two chewing sides, while groups II and III showed a decrease in correlation in N-HM mastication.
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下山 和弘, 大芦 治, 平野 滋三, 内田 達郎, 河辺 覚, 海野 雅浩, 早川 巌, 長尾 正憲, 小田切 一浩, 安藤 秀二, 山崎 ...
1994 年 38 巻 3 号 p.
655-661
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
The purpose of this study was to investigate the relationship between mental aspects and oral status among elderly dental patients. The subjects were 302 patients (126 males and 176 females, average age 74.4 yr) who visited the Gerodontic Clinic of Tokyo Medical and Dental University. The psychological test used in this study was the Cornell Medical Index (CMI) Health Questionnaire. The subjects were classified into four categories according to the CMI: Category I (diagnosed to be normal), category II (provisionally diagnosed to be normal), category III (provisionally diagnosed to be neurotic) and category IV (diagnosed to be neurotic).
The results were as follows:
1. CMI category distributions were 50.8% of the males and 35.8% of the females in category I, while 3.2% and 9.7% in category N respectively.
2. The number of the residual teeth showed a tendency to be smaller in the subjects classified as category IV than in the other categories.
3. The distribution of category N was higher in upper complete denture wearers than in upper partial denture wearers and subjects who wore no upper denture.
The results suggested that it is important to diagnose the mental state inclusive of neurotic tendency as well as physical state among elderly dental patients in dental treatment.
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第3報Ti含有Co-Cr合金への微量元素添加による物理的性質, 焼付強度
小柳 一哉
1994 年 38 巻 3 号 p.
662-673
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
To develop porcelain-facing alloys for conical double-crown telescopic prosthesis, we manufactured several alloys by adding one of four elements (Zr, B, V, and W) to the Co-Cr alloy containing 2% titanium. The physical and mechanical properties and the bond strength of these alloys were examined.
As the result, the following were obtained:
1. The addition of boron markedly lowered the melting point of the alloy. It is difficult to use boron in the porcelain-facing alloy.
2. The addition of wolfram adversely affected the physical and mechanical properties of the alloy.
3. The addition of zirconium caused no marked change in the physical or mechanical properties of the alloy.
4. The addition of vanadium altered the tensile strength of the alloy, without markedly affecting any other property of the alloy.
5. The addition of all 4 elements reduced oxide formation.
6. The structure of the cast alloy was altered by the addition of B; however, it was not possible to presume any relationship between this change and the physical or mechanical properties.
7. The bond strength was elevated by the addition of zirconium (in particular when fusing porcelain to metal at 1, 050°C under reduced pressure).
This change was accompanied by improved desquamation.
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高橋 裕, 川口 稔, 立井 大介, 稲永 昭彦, 宮崎 光治, 羽生 哲也
1994 年 38 巻 3 号 p.
674-682
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
Bond strength between abrasion-resistant plastic denture teeth bonded to pour-type denture base resin was measured to evaluate the effect of five kinds of surface treatment. Bond strength to the enamel layer of teeth was significantly improved by applying of silane coupling agent. Etching of the enamel layer by 5% of hydrofluoric acid (HF) also improved the bond strength. The maximum bond strength was obtained from the surface which was etched by HF and then applied urethane dimethacrylate-based light-activated monomers (HF+UDMA treatment). Bond strength to the dentin layer of teeth was also significantly improved by HF+UDMA treatment. There was no significant reduction of the bond strength to the dentin layer after the thermo-cycling test (10, 000 cycles), but statistically significant reduction was observed in the enamel layer. The results of this study suggested that the HF + UDMA treatment would be a useful method to improve the bond strength between highly cross-linked enamel and dentin layers of abrasion-resistant plastic denture teeth and pour-type denture base resin.
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岩神 元
1994 年 38 巻 3 号 p.
683-695
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
One of the most effectual and noteworthy methods in formation of the prosthetic fabrication is the detailed procedure which produce oral habituation. Approach to habituation in this study was performed with special reference to experimental palatal plate wearer's utterances. Five adult males served as the subjects. Experimental palatal plates were made and named F, A and P-plates. Speech materials were the eighty-two syllables which were selected from fourteen Japanese words. The analysing data sample of the utterances was measured in a time scale on a Sonagram. Statistical parameter, sample variances and correlation coefficients were calculated, and analyzed contents as follows: Almost compact variances were found in the preliminary experiment, but the fluctuation mode of sample variance was exhibited by features in three particular types after ten days.
Correlation coefficient of intra-syllable phonemes was divided into two types, compact or diffuse to the preliminary data value. Optimal syllables of the experiment, based on variance and correlation coefficient, were thirteen syllables in ten words on F-plate, seven syllables in four words on A-plate and five syllables in three words on P-plate.“kou keiki keikai keikoku” and “ui ui sii hito” were selected for the possible materials of speech analysing in the habituation study.
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長澤 亨, 小村 育弘, 呉 世旭, 阿部 泰彦, 津賀 一弘, 赤川 安正, 津留 宏道
1994 年 38 巻 3 号 p.
696-700
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
We'd like to evaluate the influence of mouth-pieces on the systematic muscular power. The purpose of this pilot study was to investigate the effect of hardness and thickness of mouth-pieces on the masticatory muscle activity.Mouth-piece material used for this study was Acryft
®(Sumitomo Chemical Industry, Osaka, Japan).Acryft
®consisted of a copolymer of ethylene and methyl methacrylate and had two hardness types of soft (WM 506) and hard (WH 202).Acrylic resin material was used as the control.The thicknesses of each material were 3mm and 6mm. The subjects were five young males (average age, 26.4years) with normal dentition.EMG activity of masseter and anterior temporal muscles, in each subject who was wearing one of six types of mouth-pieces, and at the intercuspal position were recorded five times during maximum voluntary clenching for five seconds.Thus the result showed that the EMG activity of the masticatory muscles with mouth-pieces (especially, soft 3 mm, soft 6mm and hard 3mm) significantly increased as compared with that at the intercuspal position.
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益田 高行, 吉田 恵一, 粕田 早苗, 土田 幸弘, 河野 正司, 田端 恒雄, 熊倉 徹雄, 圓口 博史
1994 年 38 巻 3 号 p.
701-705
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
The purpose of this study was to survey the oral conditions of the inpatients treated in a psychiatric hospital.
One hundred and twenty-one inpatients of Haryuugaoka Hospital who received dental care at the dental clinic of the hospital participated in this research.Their teeth, occlusal and functional conditions were recorded and the prosthodontic treatments were analyzed.
The DMFT-index of the patients was 23.12 and national average was 14.55 in 1988 moreover, they have a greater tendency for missing teeth than the national average.So 47.9% of the patients lost their occlusal contacts in both premolar and molar areas.
Functional disorders were found in 14.9% of the patients.However, the average of the range of motion of the patients was 41.0mm, that is, it was slightly smaller than the value of the normal subjects.Tardive dyskinesia also existed in 7.7% of the schizophrenic patients.
Removable dentures tended to be used more often than fixed prostheses.The prognosis of the dentures were fair.Nearly 3/4 (72.5%) of the dentures were in use at 9 months after insertion.
In the dental treatment for psychiatric patients, some problems such as the difficulty of communication remain unsolved.Cooperation with psychiatrists, clinical psychologists and nurses may be desirable to solve the problems.
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第2報: 処理時間が引張り結合強さに及ぼす影響
清水 博史, 中 四良, 井上 弘明, 森山 尚子, 森 宣昭, 井上 清, 羽生 哲也
1994 年 38 巻 3 号 p.
706-713
発行日: 1994/06/01
公開日: 2010/08/10
ジャーナル
フリー
This report investigated how different treatment durations of the three organic solvents (chloroform, 1-butanol, ethyleneglycolmonobuthylether and dichloromethane) significantly improved the tensile bond strengths of base resin and repair resin, which was reported in our previous report, in addition to dichloromethane may affect the bonding thereof.Thus the influences of the variety of the treatment duration of these four organic solvents on the tensile bond strengths were evaluated.And the changes on the surfaces of the denture resin materials after surface treatments were investigated with naked eye and scanning electron microscopy (SEM).
Under the conditions of this study, the result showed that the tensile bond strengths were improved with treatment durations of approximately 20sec (chloroform), 5sec or 20sec (1-butanol), 10sec (ethyleneglycolmonobuthylether) and 5sec (dichloromethane).
However, macroscopically and microscopically discernible changes were noted in the base resin surfaces treated with only chloroform and dichloromethane.Therefore, further a study to determine the most suitable treatment duration of the four organic solvents using compressive shearing test systems must be carried out.
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