現成螺旋根柱的應力研究第一報：根柱大小的影響

Stress Distribution of Prefabricated Screw Posts Part I: Post Size

李惠娥(Huey-Er Lee) ； 王兆祥(Chau-Hsiang Wang) ； 吳南裕(Nan-Yuh Wu) ； 郭宏亮(Hong-Liang Kuo)

《The Kaohsiung Journal of Medical Sciences》 7卷9期 (1991/09) Pp. 471-475

https://doi.org/10.6452/KJMS.199109.0471

摘要

臨床上由於快速方便，現成螺旋根柱常被使用於根管治療後的支柱牙築造。本研究是藉由光彈應力分析法來分析臨床上經常使用的一種現成螺旋根柱，比較觀察其長度及直徑大小對於所產生的應力之影響。由分析的結果顯示：
(1) 安裝應力：安裝時發生的應力，在根柱螺旋側方產生嚴重的應力集中。且根柱愈短集中情況愈明顯，直徑較大者則稍形緩和。
(2) 垂直受力時：螺旋根柱側方的應力隨受力而往兩側增加。而根柱較短其應力集中也是較明顯，直徑較大者則稍形緩和。
(3) 側向受力時：螺旋根柱應力分佈隨施力方向，在施力處對側應力增加，而根柱長短及直徑大小的影響和垂直受力時相似。

並列摘要

A commonly used prefabricated screw post was analysed for its various lengths and diameters. When endodontic dowels were in stalled in standardized moels, direct comparisons of stress distributing properties were analysed through photoelastic stress analysis. According to the analysis, installation of the post produced severe lateral stress. At shorter lengths, these concentrations were much more severe. However, increasing the diameter of the dowel may reduce the stress slightly. Under load conditions, the stress-producing characteristics of the dowel increased with shorter lengths and smaller diameters. It seems that increasing the surface area of inseration with the dentin improves the distribution of the load caused by the insertion of the post.

並列關鍵字

prefabricated psot ； post size ； photoelastic stress analysis