Di-san junyi daxue xuebao (Jul 2019)
Efficacy evaluation of different bleaching methods on different types of natural teeth
Abstract
Objective To investigate the efficacy of different bleaching methods on the different types of natural teeth in aesthetic area. Methods Forty patients undergoing natural tooth bleaching in our department of prosthetics from November 2018 to January 2019 were prospective enrolled in this study. They were randomly divided into in-office bleaching group and in-office and family bleaching group (n=20 for each group). The patients from the former group received an in-office treatment only once, and those from the latter group received a take-home bleaching treatment (with custom-made tray, 8 h/d) for 2 weeks after an in-office treatment. Materialise 3-matic modeling software and 3D printing technology were used to manufacture the individualized guides for tooth color measurement. Using the spectrophotometer VITA Easyshade and the individualized guides, the color difference was calculated. We compared the ΔE (chromatic aberration), ΔL* (luminance difference), Δa* (red green difference), Δb* (yellow blue difference) values of incisors, canines and premolars between the 2 groups before and after treatment. Results Significant differences were seen in ΔE, ΔL*, Δa* and Δb* values between the 2 different bleaching methods (P < 0.05). There were significant differences in ΔE, Δa* and Δb* values among different types of natural teeth (P < 0.05). Mutual effect on Δa* value was observed in bleaching methods and tooth types (P < 0.05). The Δa* values of 3 types of natural teeth treated by a combined in-office and at-home bleaching treatment were lower than their corresponding teeth treated by in-office bleaching treatment (P < 0.05). In a combined in-office and at-home bleaching group, the Δa* values of canines and premolars were lower than those of central incisors (P < 0.05). Conclusion The red fading effects of all types of natural teeth treated by a combined in-office and at-home bleaching therapy are better than those of all types of natural teeth treated by in-office therapy, especially in canines and premolars than central incisors.
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