고정성 가공의치에서 이차 지대치에 발생하는 응력의 삼차원 유한요소법적 분석

김정희; 조광헌; 이청희

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고정성 가공의치에서 이차 지대치에 발생하는 응력의 삼차원 유한요소법적 분석
A STUDY OF THE STRESS DISTRIBUTION ON THE SECOND ABUTMENT AND SUPPORTING TISSUES IN FIXED PARTIAL DENTURE USING THREE DIMENSIONAL FINITE ELEMENT ANALYSIS METHOD

대한치과보철학회지 2000년 38권 5호 p.675 ~ 694

김정희, 조광헌, 이청희,

소속 상세정보

김정희 ( Kim Jeong-Hee ) - 경북대학교 치과대학 보철학교실
조광헌 ( Jo Kwang-Hun ) - 경북대학교 치과대학 보철학교실
이청희 ( Lee Cheong-Hee ) - 경북대학교 치과대학 보철학교실

KMID : 0362420000380050675

Abstract

The purpose of this study was to investigate the displacement of and the stress distribution on the prosthesis, abutment, and its supporting tissues under functional load, and the effect of alteration in root length of 2nd abutment. The 3-dimensional finite element method was used and the finite element models were prepared in which the abutments of left mandibular 5 unit fixed partial denture were canine, the 1st premolar and the 2nd molar, and the root lengths of canines were as follows.Model I: Root length of canine was 2mm longer than the 1st premolarModel II: Root length of canine was 2mm shorter than the 1st premolarStatic compressive force of 300N was applied to connector between 2nd premolar & 1st molar, and then von Mises stress, displacement and reaction force were obtained.The results were as follows :1. In fixed partial denture, prosthesis under load on pontic was rotated around mesio-distal long axis of it from longual side to buccal, and simultaneously bended in buccal and gingival direction with mesial end deformed in gingival direction and distolingual end in occlusal2. Clinical crowns of abutments were bended in the same directions with those in which prosthesis deforms. Due to that, roots of anterior abutments were twisted in counterclockwise with concentration of shear stress on distal or distobuccal sides of their cervices, and that of posterior was in clockwise with concentration of shear stress on mesiobuccal side of it in the same level with anterior abutments.3. In case that root length of the 2nd abutment was longer than that of the 1st abutment, its displacement and reaction force which means the force tooth exerts on the surrounding periodontal tissues were smaller but shear stress on itself was larger than in the case root length of 2nd abutment was shorter.