다양한 포스트와 코어의 물성이 근관치료된 치근의 응력분산에 미치는 영향
INFLUENCE OF VARIOUS PROPERTIES OF POST AND CORE ON THE STRESS DISTRIBUTION IN ENDODONTICALLY TREATED TOOTH
조진현, 이청희,
소속 상세정보
조진현 ( Cho Jin-Hyun ) - 경북대학교 치과대학 보철학교실
이청희 ( Lee Cheong-Hee ) - 경북대학교 치과대학 보철학교실
KMID : 0362420060440010010
Abstract
Statement of problem : The various kinds of properties of post and core may affect the stress distribution to the root of endodontically treated teeth
Purpose: To evaluate the influence of various kinds of properties of post and core to the stress distribution to the root of endodontically treated teeth.
Material and methods: Mandibular first premolar, prepared by general shape of post and core with gold crown, was used to two dimensional axisymmetric modeling for finite element analysis. Then property values of 8 different kinds of post and core was substituted for each. Finally, stress distribution shown areas around the root of post and core was analysed after applying 50N of vortical and oblique load.
Results: 1. Stress value of oblique load was much higher than the maximum stress value of vertical load. 2. Under oblique load, very concentrated stress was located on post periapical area and variations in stress were very severe. Contrary to this, stress distribution was relatively uniform in vertical load. 3. Post materials with higher elastic modulus showed relatively more apically focused stress, and post materials with lower elastic modulus showed stress focused on cervical area on the axial wall of post. 4. Stress change according to the properties of core was shown only in the cervical area of post and below core as the higher elastic modulus, then increased in stress. 5. Post and core with medium value of elastic modulus showed relatively uniform stress distribution.
Conclusions: Post materials with higher elastic modulus showed relatively more apically focused stress, and post materials with lower elastic modulus showed stress focused on cervical area on the axial wall of post. Stress change according to the properties of core was shown only in the cervical area of post and below core.
키워드
Post and Core;Various property;Axisymmetric model;Oblique and Vortical load
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