Comparison of enamel discoloration associated with bonding with three different orthodontic adhesives and cleaning-up with four different procedures

ObjectiveThe aim of this study was to compare whether there was any difference in the enamel discoloration after staining when three orthodontic adhesives and four enamel clean-up methods were tested.Materials and methodsThree types of orthodontic adhesives were used: chemically cured resin, light-cured resin and resin-modified glass-ionomer cement. A total of 120 human extracted premolars were included. 10 teeth of each orthodontic adhesive were randomly cleaned-up with one of four different procedures and stained in coffee for seven days: (1) carbide bur (TC); (2) carbide bur; Sof-Lex polishers (TC + SL); (3) carbide bur and one gloss polishers (TC + OG); and (4) carbide bur and PoGo polishers (TC + PG). Color measurements were made with Crystaleye dental spectrophotometer at baseline and after storage in a coffee solution one week. Two-way ANOVA and Bonferroni tests were used for statistical analyses (P < 0.05).ResultsThe color change values of the adhesive materials in the TC groups were the greatest. The lowest ΔE* values were obtained from the TC + SL groups. However, there were no significant difference between the TC + SL and TC + PG groups (P > 0.05). The resin-modified glass-ionomer cement groups showed the lowest color differences and chemically cured resin groups showed the highest ΔE* values among all the orthodontic adhesives (P < 0.05).ConclusionThe color change of enamel surface was affected by the type of adhesive materials and cleanup procedures.