하악제1대구치의 Brackek 높이에 따른 torque값의 변화에 관한 연구
A Study on Changes of Torque Value According to Bracket Height in Mandibular First Molar
김정호, 김광원,
소속 상세정보
김정호 ( Kim Jeong-Ho ) - 조선대학교 치과대학 교정학교실
김광원 ( Kim Kwang-Won ) - 조선대학교 치과대학 교정학교실
KMID : 0353319900140010057
Abstract
This study was done to evaluate the changes of torque value according to bracket height. 6.1 mandibular first molar samples were selected and estimated the torque value with computer system under the condition that bracket or tube was attached to the buccal surface of the tooth at the vertical heights of ;3.0, 3. 5, 4. C, 4.5㎜ from cusp tip which has been used as the reference heights, clinically.
The following results were obtained;
1. The torque values at the bracket height of 3.0, 3.5, 4.0, 4.5㎜ were -31.0876, -26.7557, -22.6041, -17.8878 degree, respectively.
2. The changes of mean torque value according to bracket height of 0. 5㎜ decrease or increase were 4~5 degree, approximately.
3. The preadjusted torque values of bracket or tube in mandibular first molar as -27, -22 degree were found to fit those of 3.5, 4.0㎜ bracket height, respecitively.
4. The torque values need individual adjustment due to high variance as attached bracket height and tooth morphology.
키워드
원문 및 링크아웃 정보
등재저널 정보