下顎片側遊離端義歯における支台歯の挙動に対する双子鉤

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  • Effect of Embresure Clasp on Abutment Tooth Movement of Lower Distal-extention Removable Partial Denture

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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.

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