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, 5 号
選択された号の論文の15件中1～15を表示しています
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柏田 聰明1997 年 41 巻 5 号 p. 747-762
発行日: 1997/10/01
公開日: 2010/08/10
ジャーナル フリーDental adhesives play an important role in dentistry today.
However, to achieve long-term preservation of teeth, which is the clinician's foremost concern, dental adhesives alone cannot be completely relied upon to produce the desired results.
In this paper, five rules for the achievement of long-term tooth preservation are presented, and the results of preliminary tests employed to evaluate the validity of these rules are reported. Clinical techniques for each case are presented. The five rules are as follows:
1. To preserve as much pulp substrate as possible
2. To seal the tooth completely using dental adhesive
3. To select restorations and dental adhesives which avoid stress concentration
4. To restore tooth substrate and pulp to a sound vital tooth state by means of sterilization before sealing
5. To strengthen the tooth by using fluoride-releasing materials, under the assumption that a secure seal may not always be obtainable
With regard to rules 2, 4, and 5, the application method and efficacy of a new dentin treatment technique (AD gel method) invented by the author, in which the affected dentin is cleaned and sterilized, and dentinal tubules are enlarged by partially dissolving their organic components to promote thicker resin tags, are detailed.抄録全体を表示PDF形式でダウンロード (27099K) -
澤田 宏二, 荒井 良明, メディナ ラウル, 河野 正司1997 年 41 巻 5 号 p. 763-768
発行日: 1997/10/01
公開日: 2010/08/10
ジャーナル フリーThe mechanism of condylar dislocation is not clearly understood. Temporomandibular (TMJ) surgery is a common option in the treatment of chronic condylar dislocation, but some authors have reported disappearance of its symptomatology after occlusal treatment.
A case in which condylar dislocation disappeared by changing the location of anterior guidance is presented. The patient was an 18-year-old male with an Angle class III malocclusion who had been suffering from condylar dislocation of the right TMJ upon waking up for almost one year. Clinical inspection showed that the mandibular right second molar was guiding the mandibular eccentric movements. Dislocation of the TMJ disappeared by shifting anteriorly the tooth guidance with a stabilization splint. Jaw and condyle movements were recorded by a 6-degree-of-freedom measuring device during lateral excursions with and without wearing of the splints in order to assess the influence of shifting anteriorly the location of tooth guidance on the cure of dislocation. It was found that the direction of condylar movements changed markedly during parafunctional grinding tasks. Therefore, it was concluded that抄録全体を表示PDF形式でダウンロード (3359K) -
紋谷 光徳, 野村 修一, 河野 正司, 加茂 剛介, 小澤 香1997 年 41 巻 5 号 p. 769-773
発行日: 1997/10/01
公開日: 2010/08/10
ジャーナル フリーClinical examination of a partially edentulous 66-year-old male revealed a large asymptomatic denture fibroma-like hyperplasia in the junction of the floor of the mouth and the posterior alveolar ridge on the right side of the oral cavity which was arbitrarily named a fibrosis. A chord of gingival and mucosal tissue was found in the same area on the left side.
The fibrosis was 38mm in length, 7mm in width, and 8mm in height.
As a consequence of the loss of posterior mandibular occlusal support, the right upper molars over-erupted and the third molar was in contact with the corresponding inferior alveolar ridge.
An immediate partial denture was made and lined with tissue conditioner in the area corresponding to the fibrosis. This denture was designed to prevent the mechanical stimulus of chewing the fibrosis. The size of the fibrosis reduced gradually, and denture base adjustment and linings were made respectively. The fibrosis became a chord of tissue similar to the one on the left side and not shown any apparent change in a 5-month period.
It was thought that the chronic mechanical stimulation of masticatory function played an important role in the development of the fibrosis.抄録全体を表示PDF形式でダウンロード (5881K) -
木村 拓郎1997 年 41 巻 5 号 p. 774-786
発行日: 1997/10/01
公開日: 2010/08/10
ジャーナル フリーAn investigation was made on the effects of teeth splint for a certain period on masticatory movement.
The changing profile of each parameter was observed and the results were analyzed according to the method of canonical correlation analysis for two variable groups of pathway parameters and electromyograph parameters for every subject.
From the daily changes in the mean value ±S.D. of each constituent variable for masticatory pathways and muscle activity, it was found that the effects immediately and one day after the splint were larger on mastication of the habituated side than of the non-habituated side.
The conditions became stable more than 3 days after splinting. There were large individual differences before splinting in the correlation between the masticatory pathways and muscle activities.
All of the subjects showed a great change in the correlation immediately following splinting of teeth, resulting in their stable conditions with time.
From these results, it was concluded that splinting of teeth was one of the factors which might change the masticatory movements peculiar to an individual and such changes lead to their stable conditions with time.抄録全体を表示PDF形式でダウンロード (4905K) -
臼歯部の標準歯冠モデルの作成会田 英紀, 上田 康夫, 依本 卓見, 疋田 一洋, 内山 洋一1997 年 41 巻 5 号 p. 787-795
発行日: 1997/10/01
公開日: 2010/08/10
ジャーナル フリーIn recent studies of CAD/CAM systems for crown restorations, the quantity of data of the basic model has been reduced to a minimum to transform three-dimensional shapes quickly. As a result, there is no model to represent a detailed tooth crown form like an occlusal surface. The purpose of this study was to create a tooth crown model showing minute coronal features. The results were as follows.
1. By dividing the occlusal surface into a grid pattern, solid models of molar teeth represented by bicubic Bézier surfaces were made from three-dimensional coordinate data of four times enlarged plaster models measured from five directions.
2. In order to represent the minute occlusal surface shapes of the molar teeth, it was necessary to divide the occlusal surfaces of the four times enlarged models into more than 1, 024 Bäzier surfaces, and the occlusal surfaces of the actual size models into more than 256 Bäzier surfaces.
3. In the premolar teeth, it was necessary to divide the occlusal surfaces of the four times enlarged models into more than 256 Bézier surfaces, and the occlusal surfaces of the actual size models into more than 64 Bézier surfaces.
4. Topological structure models may represent minute shapes efficiently with little data.抄録全体を表示PDF形式でダウンロード (6257K) -
西山 實, 廣瀬 英晴, 大木 一三, 佐藤 吉則, 小林 喜平1997 年 41 巻 5 号 p. 796-803
発行日: 1997/10/01
公開日: 2010/08/10
ジャーナル フリーChronological change in physical properties of novel silicone-rubber denture relining material: Denture Relining and tensile bond strength (Tbs) to denture base resin immersed in water at 37°C for 1 day to 5 months were investigated. Further Tbs after immersion in denture cleanser solution for 1 month was studied.
Shore hardness of Denture Relining Soft type (DRS) and Denture Relining Medium type (DRM) showed 35 and 46 after 1-day immersion. Tensile strength of DRS and DRM showed 2.95 and 2.94 MPa after 1-dayimmersion, then increased chronologically, and showed 3.81 and 4.37 MPa after 5-month immersion. Tearstrength of DRS and DRM showed 10.21 and 9.18 kN/m after 1-day immersion, then unchanged or slightlyincreased chronologically, and showed 11.14 and 9.22 kN/m after 5-month immersion. Tbs of DRS and DRM showed 2.52 and 2.30 MPa after 1-day immersion, then chronologically increased, and showed 3.83 and 2.82 MPa after 5-month immersion. These values were significantly superior to those of two ordinary siliconerubberrelining materials.
Tbs of DRM after immersion in denture cleanser solution were changed according to the kind of thedenture cleanser. The ferment denture cleanser containing neutral peroxide did not decrease Tbs of DRM andwas thought to be an effective cleanser for denture plaque control.抄録全体を表示PDF形式でダウンロード (3176K) -
疋田 一洋1997 年 41 巻 5 号 p. 804-813
発行日: 1997/10/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of this study was to examine the technical possibility of fabricating crowns by using CAD/CAM. First, it was attempted to construct a crown-form model by NC milling, based on threedimensionalmeasurement data obtained by a touch probe. Next, it was attempted to fabricate the metal crownby NC milling and spark erosion, based on three-dimensional measurement data obtained by a touch probe orlaser scanning.
The results were as follows:
1. The crown-form model fabricated according to three-dimensional measurement data obtained by atouch probe was restored accurately, compared with the original crown-form model. The differences in thethree-dimensional data of occlusal surfaces between the two models were 20-100μm.
2. The crown-form model fabricated according to three-dimensional measurement data obtained by laserwas not restored accurately, compared with the original crown-form.
3. It was possible to fabricate a metal crown by NC milling and spark erosion. Therefore, it wasconfirmed that fabrication of crowns by CAD/CAM is technically possible.抄録全体を表示PDF形式でダウンロード (12018K) -
高橋 宏美, 小森山 学, 平澤 忠1997 年 41 巻 5 号 p. 814-821
発行日: 1997/10/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of this investigation was to study the Knoop hardness test, absorption and solubilityin MMA, and filler contents of the commercially available several cross-linked plastic denture teeth.
In addition, tensile bonding strength of three denture base resins, heat-cured resin, heat-shock resin, andauto-cured resin, bonded to the artificial teeth was measured. Four cross-linked plastic denture teeth and oneconventional acrylic denture tooth were studied.
Knoop hardness in the enamel of the specimens was as hard as the commercially available compositeresins for crown and bridge.
The enamel contained 25-45% filler. The enamel had high cross-linked polymer, so the rates of swellingand solubility in MMA of the enamel were lower than the body of the specimens and the enamel and body ofplastic denture teeth.
The body and dentin of the specimens showed better tensile bond strength than the enamel. Tensile bondstrength of the heat-cured resin and the heat-shock resin bonded to the body was better than the auto-curedresin bonded to the body.
There was no difference in results between the body and the conventional acrylic tooth in all examinations.抄録全体を表示PDF形式でダウンロード (2694K) -
第1報各歯の接触の有無とその組合せパターンの数値化と類似性の評価 (咬頭嵌合位)竹中 誠, 伊藤 裕, 佐久間 重光, 向田 吉範, 中村 健太郎, 栗田 鉄也, 加藤 賢吾, 水野 正喜, 荒木 章純1997 年 41 巻 5 号 p. 822-829
発行日: 1997/10/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of this study was to objectively evaluate the occlusal contact and similarity of teethand occlusal patterns. At first, occlusal contact at the intercuspal position of 100 normal subjects wasinvestigated. Furthermore, an attempt was made to apply correspondence analysis to occlusal contact.
1. The tooth order from the high to low contact percentage was second molar, first molar, first premolarand second premolar. This order was the same on both sides.
2. There were 44 occlusal patterns. The occlusal pattern of many subjects was contact type in all teeth.
3. By correspondence analysis, the tooth score of the incisor group, cuspid, premolar group, and molargroup were much the same for each group. The order of tooth score was first incisor, second incisor, cuspid, molars, first premolar, and second premolar. In view of these results and the tooth order in contact percentage, tooth order in the need of contact was suggested to be posterior teeth, molars, first premolar and secondpremolar and in anterior teeth, cuspid, second incisor and first incisor.
4. The score of the pattern of having contact in all teeth was made positive near 0, which was the centerin distribution of all patterns. The score of pattern having no contact in 6 anterior teeth and 4 incisal teeth wasgiven on the edge of the distribution of all patterns.5. From these findings, correspondence analysis was suggested to be useful with a possibility forobjective evaluation of occlusal contact.抄録全体を表示PDF形式でダウンロード (1721K) -
第3報口腔内細菌の殺菌効果について塚崎 弘明, 酒井 敏博, 芝 華彦, 加瀬 智夏1997 年 41 巻 5 号 p. 830-834
発行日: 1997/10/01
公開日: 2010/08/10
ジャーナル フリーElectrolyzed water is obtained at the cathode by electrolyzing tap water to which a small amountof NaCl has been added. To apply this electrolyzed water to the dental region, the germicidal effect of oralbacteria was studied.
The results were as follows:
1. All bacteria in gram-positive and fungus type strains tested were killed almost 100 percent byelectrolyzed water in 10 sec.
2. The bacteria of gram-negative were killed from 60 to 100 percent by electrolyzed water in 10 sec, except S. intermedius.
3. The germicidal effect of electrolyzed water was inhibited by organic materials containing variousproteins. These results suggested that electrolyzed water may be a very useful disinfectant in the dental regiondue to its strong killing action.抄録全体を表示PDF形式でダウンロード (1192K) -
主成分分析による解析笠原 紳, 奥山 弥生, 木村 幸平1997 年 41 巻 5 号 p. 835-842
発行日: 1997/10/01
公開日: 2010/08/10
ジャーナル フリーIn order to investigate the tendency of preparation results by dental students of the maxillary leftfirst molar in manikin head with artificial gingiva, 41 measurements (under 8 items) of each prepared artificialtooth were taken and these data were evaluated by the principal component analysis (PCA).
The results were as follows:
1. Cumulative contribution ratios of the first and second components of PCA were 0.19 and 0.11, respectively.
2. The results of PCA showed that the first component depended on the factor of the preparation volume, and the second component on the factor of the preparation form, respectively.
3. PCA revealed that in most cases of preparation by dental students, much tooth substance was lost andpreparation form was poor.
4. It is useful to apply PCA for the evaluation of multivariate measurements in the dental field.抄録全体を表示PDF形式でダウンロード (2624K) -
西川 悟郎, 佐藤 隆志, 崎谷 公子, 大森 智弘, 末長 かおり, 松永 匡司1997 年 41 巻 5 号 p. 843-849
発行日: 1997/10/01
公開日: 2010/08/10
ジャーナル フリーThe purpose of this study was to examine the physical properties of newly-developed Polycarbonate resin for denture base (Developmental code No.: SI-9301, Shofu Co.) and compare the properties with those of heat curing acrylic resin.
The results were as follows:
Bending rigidity, tensile strength and superficial hardness of the polycarbonate resin were not superior to those of heat curing acrylic resin.
However, water repellence, water insolubility, abrasionproof power and bending strength of the ploycarbonate resin were superior to those of heat curing acrylic resin.
Investigating these results from the stand point of physical properties clinically required for the denture base material, it was revealed that the physical properties of polycarbonate resin examined in this study are superior to those of heat curing acrylic resin.抄録全体を表示PDF形式でダウンロード (1496K) -
梅原 亜紀, 野首 孝祠, 安井 栄, 中村 喜美恵, 沖山 誠司, 山本 誠1997 年 41 巻 5 号 p. 850-855
発行日: 1997/10/01
公開日: 2010/08/10
ジャーナル フリーThe masticatory efficiency in normal dentate people and complete denture wearers has been evaluated by using testing gumi-jelly. However, some complete denture wearers who cannot chew the testing gumi-jelly (20×20×10mm) within a given chewing stroke are occasionally encountered. In this study, the masticatory efficiency test using testing gumi-jelly (20×10×10mm) cut in half was examined to evaluate the masticatory function of these cases. It was indicated that there was a significant proportional correlation between the surface area of the four kinds of specimens divided into equal parts and the amount of glucose discharged from the surface of the gumi-jelly. The increasing rate of surface area after chewing the half-type was higher than the whole-type in ten complete denture wearers. In particular, the rate of increase after chewing was remarkable in patients whose masticatory efficiency was not shown by using the whole-type. It was suggested that the masticatory efficiency test using testing gumi-jelly cut in half would be an extremely useful method for patients with low masticatory function.抄録全体を表示PDF形式でダウンロード (3335K) -
今井 敦子, 川添 堯彬, 田中 昌博, 岩山 陽子, 古市 英史1997 年 41 巻 5 号 p. 856-861
発行日: 1997/10/01
公開日: 2010/08/10
ジャーナル フリーCooked rice is the staple food for Japanese. It has been considered whether cooked rice can be used in the examination of mastication. The purpose of the present study was to ascertain its appropriateness as a test food.
The results were as follows:
1. The questionnaire was given to 130 people and asked their preference and intake frequency of cooked rice. The survey showed a high preference and intake frequency.
2. A model of various textures was prepared using nine combinations in accordance with L9 (34) orthogonal array. The use of 15 or 20g of cooked rice was found to be appropriate. It was concluded that cooked rice was not affected by soaking time (within 12hours) or by the time it was kept (within 6hours).
It was also concluded that it was appropriate to use for the evaluation of the masticatory function as a test food.抄録全体を表示PDF形式でダウンロード (2829K) -
光透過性について河原 一茂, 島田 和基, 今 悟, 宮島 和臣, 小泉 寛恭, 桟 淑行, 五十嵐 孝義1997 年 41 巻 5 号 p. 862-867
発行日: 1997/10/01
公開日: 2010/08/10
ジャーナル フリーTo evaluate light transmission of IPS Empress, spectral transmittance using transmitted light and luminous transmittance were determiend. The results were as follows:
1. In luminous transmittance, light was transmitted more in the order of T 1, O 2, TC 2, and A 2. Luminous transmittance decreased as the thickness of all ingots increased.
2. In spectal transmittance of all thicknesses and wavelengths light was transmitted more in the order of T 1, O 2, TC 2, and A 2.
3. In spectral transmittance of each wavelength, decrease of transmittance in short wavelength was great for all ingots. Transluscent ingot with dentin color (TC 2) and dentin color ingot (A 2) were greater than others.抄録全体を表示PDF形式でダウンロード (1244K)
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