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J Korean Acad Pediatr Dent. 2003;30(1): 41-46.
EFFECT OF ETCHING TIME ON ENAMEL SURFACE ROUGHNESS: CONFOCAL LASER SCANNING MICROSCOPIC STUDY
감동훈, 김정욱, 장기택, 이상훈, 김종철, 한세현
서울대학교 치과대학 소아치과학교실 및 치학연구소
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ABSTRACT
In order to evaluate the sufficient etching time for successful bonding and also minimizing unnecessary mineral loss, the enamel surface roughness analysis was performed using confocal laser scanning microscopy. Sixty extracted sound human molar teeth were imbedded in the center of acrylic cylinder using self-curing clear resin exposing buccal surface, and then polished with series of SiC paper(220, 500, 800, 1000, 2000, 4000 grit). Each specimen was randomly assigned to six groups(N=10). 37% phosphoric acid was applied to the polished tooth surface for 10, 20, 30, 40, 50, 60 seconds respectively and washed with copious water. After the surface roughness analysis, five roughness parameters(Sa, Sq, Sz, Sdr, Ra) were statistically analysed by ANOVA and Duncan post hoc test. We found that the all five parameters had higher roughness value in 30 seconds etching time, especially parameter Sz showed the lowest value in 10 seconds etching time and the highest value in 30 seconds etching time compared with the other etching times(p<0.05).
Keywords: Enamel | Surface roughness | Etching time | Confocal laser scanning microscopy
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