침수 및 열순환에 따른 레진브라켓 Wing의 파절강도 변화
Change of fracture mode of orthodontic resin bracket wings under water Immersion and thermocycling
손지형, 박소영,
소속 상세정보
손지형 ( ) - 전남대학교 치과대학 교정학교실
박소영 ( ) - 전남대학교 치의학연구소
KMID : 0361920000300040475
Abstract
The purpose of this study was to evaluate the effect of oral environment on the strength of resin bracket wings by comparing fracture mode according to water immersion and thermocycling. Seventy-five resin brackets(Spirit MB, Ormco, California) were divided into three groups and treated for six months as follows; (1) untreated, (2) water immersion in distilled water at 37C, (3) water immersion in distilled water at 37C with total 2,100 times of thermocyeling taken 350 times each month. Fracture mode of the wing was tested on universal testing machine. In addition to resin brackets, 25 metal brackets were used as controls. Through the statistical analyses, following results were obtained.
1. Resin bracket wings showed significantly lower fracture strength than metal brackets(p<0.001).
2. Water immersion and water immersion with thermocycling groups showed significantly lower fracture strength than open air condition group(p<0.001). ´
3. Water immersion with thermocycling group showed significantly lower fracture strength than water immersion group(p<0.001).
The above results sugg est that the mechanical property of resin bracket wing may be influenced by oral environment and further research is needed to improve the strength of the wing in the resin bracket.
키워드
레진 브라켓 윙;파절강도;침수;열순환;resin bracket wing;fracture mode;water immersion;thermocycling
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