Abstract
This study evaluated the influence of 3 different photopolymerization sources on enamel shear bond strength after bleaching with 10% carbamide peroxide. Seventy-two incisive bovine teeth were randomly divided into 6 groups (n=12) according to bleaching treatment and photopolymerization source used: G1 -- Bleached / Halogen lamp; G2 -- Not bleached / Halogen lamp (control); G3 -- Bleached / Light-emitting diodes (LED); G4 -- Not bleached / Light-emitting diodes (LED) (control); G5 -- Bleached / Xenon plasma arc; G6 -- Not bleached / Xenon plasma arc (control). Experimental groups were exposed to bleaching agent for a period of 14 days, with a daily contact of 4 h and then stored in artificial saliva at 37 degrees C. Control groups were stored in artificial saliva at 37 degrees C for same period of bleaching treatment. Procedures for bonding composite resin to enamel were carried out according to manufacturer instructions. After storage in distilled water at 37 degrees C for 24 hours, all samples were submitted to shear bond strength test. G2 had the highest mean value (14.86 MPa) while G5 had the lowest (12.32 MPa). The comparison of groups by 2-way ANOVA showed that there were no significant differences for either of the factors considered in this study (bleaching and photopolymerization source), hence the interaction between these factors. It was therefore possible to conclude that neither enamel bleaching nor the photopolymerization source used had any influence on enamel shear bond strength.
Highlights
Dental bleaching has been used as a feasible alternative for discolored teeth
This treatment has been used in dentistry for many years, and its popularity has grown since the introduction of nightguard vital bleaching
The replacement of adhesive fillings immediately after nightguard vital bleaching lacks any scientific basis to guide the professionals as to the optimal conduct to adopt [1]. Previous research on this subject has shown no agreement either on the possible decrease in bond strength caused by dental bleaching or on the necessary waiting time for the replacement of adhesive fillings after these treatments [1]
Summary
Dental bleaching has been used as a feasible alternative for discolored teeth. This treatment has been used in dentistry for many years, and its popularity has grown since the introduction of nightguard vital bleaching. A great number of scientific publications assert that residual oxygen from the bleaching agent, present in dental enamel, could be the cause of failure in adhesive procedures after bleaching This mechanism is triggered by the inhibition of the adhesive system and composite resin polymerization, accounting for the postponement of restorative treatment after bleaching [2,3,4,5,6]. Faced with the need to postpone the replacement of direct and indirect fillings after the nightguard vital bleaching treatment, for a period of up to 21 days [1], thereby increasing the patient’s anxiety, it is important to evaluate the possibility that these recent photopolymerization sources may reduce, or even eliminate, the waiting time, through a polymerization process that ensures better physical and mechanical qualities for the final filling
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