Comparison of residual monomer leaching from orthodontic adhesives at different light curing tip distances
Introduction: Improving the bond strength of orthodontic adhesives along with reduction in their deleterious effects has always been required. Present study was aimed at comparing the mean residual monomer (RM) leaching from adhesives cured at 0mm and 10mm curing light tip distances.
Material and Methods: In this in-vitro study, 60 extracted teeth were selected and 30 teeth were placed in group A and 30 teeth were placed in group B, by random process. Group A teeth brackets were cured at light tip distance of 0mm and Group B at 10mm distance. High performance liquid chromatography (HPLC) was utilized for measuring the RM. Independent t-test was used for comparison of mean release of RM.
Results: The mean value of RM was significantly higher in adhesives cured at 10mm distance (p-value = 0.000).
Conclusions: 0mm curing light tip distance is recommended in clinical orthodontic practice as the residual monomer leaching was significantly less as compared to the 10mm distance.