인산옹도가 소의 법랑질에서 부식깊이와 브라켓 전단결합강도에 미치는 영향
EFFECTS OF PHOSPHORIC ACID CONCENTRATION ON DEPTH OF ETCH AND SHEAR BOND STRENGTH OF ORTHODONTIC BRACKETS TO BOVINE ENAMEL
김수철, 권무일,
소속 상세정보
김수철 ( ) - 경희대학교 치과대학 치과교정학교실
권무일 ( ) - 경희대학교 치과대학 치과교정학교실
KMID : 0361919950250030341
Abstract
Previous study had shown the diversities in the propriety for optimal bond strength on the concentration of the etchant. The aim of present study in vitro was to evaluate and compare the shear bond strength of orthodontic brackets to enamel and to measure the depth of etch on the phosphoric acid concentrations.
A hundred and seventy six extracted bovine lower centrals were ground to yield flat surfaces and etched by the concentration 04 5% 10%, 20%, 30%, 40% 50%, 60%, 70%, 80% and 85% of phosphoric acid respectively during 60 seconds. The shear bond strength of orthodontic brackets, the depth of etch and surface roughness of the enamel were measured, and sunning electron microscopic observations on the etched enamel surfaces were carried out. The data obtained from the very experiments were processed and statistically analyzed and evaluated.
The gradual increase in the depth of etch to enamel as the accretion of the concentration of the phosphoric acid upto 40-50% and decline henceforth were mAnifested The surface roughness showed no correlation with the depth of etch, yet moderate correlation with the shear bond strength of brackets. Scanning electron microscopic investigation revealed that morphological patterns of the etched enamel surfaces for 5% to 40°/5 of concentrations were even and homogenous, and those for 50°16 as well as 60°16 exhibited the overetched and unhomogenous. The shear bond strengths from 10% to 60% of concentration showed no statistically significant differences.
It was suggested that the shear bond strengths at 5% and 70016 were sufficient to tolerate the force levels of the ordutarv orthodontic treatment notwithstanding to be significantly lower than those from 10% to 60% phosphoric acid solution
키워드
인산농도;부식깊이;표면조도;전단결합강도;Phosphoric acid concentration;Etohnt;Shear bond strength;Orthodontic bracket
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