著者

山森 徹雄 植原 典子 清野 和夫 谷 信幸 島崎 政人 高橋 秀美 中原 元 斉藤 彰久 浅井 政一 長山 克也

出版者

社団法人 日本補綴歯科学会

雑誌

日本補綴歯科学会雑誌 (ISSN:03895386)

巻号頁・発行日

vol.40, no.2, pp.245-248, 1996-04-01 (Released:2010-08-10)

参考文献数

11

被引用文献数

1 2

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It was attempted to apply barrel finishing to improve the surface texture of the basal surface of the complete denture. The effect of barrel finishing on the denture base resin of rough surface should be confirmed to understand the alteration of the basal surface of complete denture after barrel finishing, because it is corrugated. The denture base resin samples with standardized corrugated surface were made using a metal mold, then each sample was divided into halves. One of the halves was barrel finished following the manufacturer's instruction after masking the datum plane, whereas the other one was used as a control without finishing. Both samples were observed under the reading microscope, and the distances between the base line and the top of each corrugation or the bottom of each corrugation were measured. Observation under the scanning electron microscope was also made. The results were as follows:1. The scanning electron microscopic observations showed that the top of the corrugation was obviously made round and smooth by barrel finishing, and that the bottom of the corrugation was also made smooth but it was less smooth than the top of the corrugation.2. The cutting depth of the denture base resin was 218.13μm at the top and 3.53μm at the bottom of the corrugation.These findings suggest that there is no problem after barrel finishing of the basal surface of complete dentures even if attention was paid to the height of the bead established for the posterior palatal seal.

著者

浅井 政一

出版者

奥羽大学

雑誌

奥羽大学歯学誌 (ISSN:09162313)

巻号頁・発行日

vol.32, no.2, pp.111-121, 2005-06-30

被引用文献数

2

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This study was carried out to find out whether embresure clasp has a support ability on the movement of an abutment tooth of the partial denture under the condition of alveoral bone resorption. Two types of chrome-cobalt removable partial denture castings were fabricated on a mandibular test model simulating a free-end saddle. The compornent parts of each casting were Akers' clasp or embresure clasp on an abutment tooth, indirect retainers (Akers' clasps on teeth Nos. 44 and 47), a lingual bar and a metal base with loading platform. The height of the alveoral bone portion around the abutment tooth was set in two positions, which were at no reduction and 1/4 reduction, respectively. The partial denture castings were seated with a 2 kgf load by a loading apparatus. The movement of the abutment tooth was measured at a higher magnification using an indicator rod attached to the occlusal surface of the tooth. The Sirognatho analyzer system was used to analyze the direction and magnitude of abutment tooth movement. The results were as follows : The direction of abutment tooth movement by the load was mesial when observed in the mesio-distal direction. 2. When observed in the bucco-lingual direction, the abutment tooth movement on both direct retainer was mesio-lingual direction under the alveoral ridge crest load and the lingual load respectively, but the one under the buccal load showed mesio-buccal movement. 3. Abutment tooth movement increased according to the reduction of the alveoral bone portion. The distance of abutment tooth movement with embresure clasp was smaller than that with Akers' clasp. These results suggested that embresure clasp would be efficient as a direct retainer for the abutment tooth under the condition of alveolar bone resorption.