Effect of Highly Filled Light-Cured Resin Sealant on Bracket Shear Bond Strength in Demineralization Conditions
Abstract
This study examined the effect of a highly filled light-cured sealant (HFLCS) on
bracket shear bond strength and subsequent adhesive remnant index (ARI) following
exposure to cariogenic challenge. Specimens were divided into two groups to receive
conventional primer or HFLCS prior to orthodontic bracket bonding in a simulated oral
environment. After curing bracket adhesive, specimens were separated into two storage
solutions, either phosphate buffered saline or a demineralization solution (pH 4.1) for 96
hours. Brackets then underwent shear bond strength testing followed by ARI scoring.
Enamel surfaces were visually examined for white spot lesion (WSL) severity using a WSL
scoring index.
HFLCS and exposure to demineralization conditions were not significant factors in
shear bond strength or subsequent adhesive fracture pattern (ANOVA, p>.05). The majority
of brackets were given an ARI score of 1, meaning that greater than 50% of the resin
adhesive remained on the bracket. A significant difference (p<0.05) was detected in WSL
scores between the HFLCS and conventional primer groups when exposed to
demineralization conditions. With HFLCS, no specimen developed WSLs, while all
specimens with conventional primer had either minor or severe WSL formation
after cariogenic challenge. This investigation suggests that HFLCS did not have a protective
effect on bracket bond strength in demineralization conditions, but HFLCS was effective in
preventing enamel demineralization without compromising shear bond strength.
Table of Contents
Introduction -- Materials and methods -- Results -- Discussion -- Conclusions
Degree
M.S.