パーシャルデンチャー・デザインと維持歯の挙動　第１報　Ｋｅｎｎｅｄｙ　ＩＩ級１類の中間欠損側近心こう歯について

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  • Effects of partial denture clasp assembly on abutment tooth movement. Part 1. Movements of mesial abutment tooth in tooth-supported segment on kennedy class II modification 1 simulation model.
  • Part 1. Movements of Mesial Abutment Tooth in Tooth-supported Segment on Kennedy Class II Modification 1 Simulation Model
  • 第1報Kennedy II級1類の中間欠損側近心鉤歯について

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The excellent success through many implant systems such as the osseointegrated and others have been directed toward reducing the interest and research effort for removable prosthesis over the past few years.<BR>The need to improve the quality of removable partial dentures through research, however, will remain at a high level because the implant procedures will never eliminate removable prosthodontics at an early date.<BR>The research for the removable prosthesis, especially the movement of the abutment tooth, has been investigated in various ways such as by strain gauge, photoelastic and finite element methods, including a few experiment executedin vivo. All of them, however, have disadvantages respectively, so more effective methods for observation of the abutment tooth behaviors have been waiting for.<BR>Authors have undertaken some experiments on the abutment teeth behaviors under loading by a new analysing method that combined with MKG to the Frechette's method.<BR>This study was to analyse and evaluate the movements of the mesial abutment tooth in the tooth-supported segment on Kennedy Class II Modification 1 simulation model by the same method.<BR>The results were as follows;<BR>1. As the constructred factors were reduced from the original design of the RPD, the abutment tooth movements increased gradually.<BR>2. The greatest movements were recognized under the lingual load, and the minimum ones under the vertical load.<BR>3. Few movements toward the mesial direction were observed in every design.<BR>4. Movements toward the linguo-distal direction were remarkably noticed on almost designs.

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