Dano ao esmalte na remoção de contenção dental – efeito dos tipos de iluminação e de instrumentos rotatórios

Abstract

Background/Aim: Removal of composite resin used for dental trauma splint may result in irreversible damage to enamel. The aim of this in vitro study was to evaluate the influence of additional illumination and different bur types on the generation of damage to dental enamel. Materials and Methods: Fifteen maxillary models with four bovine teeth were generated. All models were scanned, using a laboratory scanning systems (s600 ARTI; Zirkonzahn). After a flexible nylon splint was created using etch-and-rinse adhesive and fluorescence resin composite. One operator removed all splinting. The 6 groups experimental groups (n=10) were generated by 2 study factors: lighting type (1. low cost violet light; 2. VALO cordless with violet filter; or 3. without additional illumination) and rotatory instrument (1. diamond bur; or 2. multifluted tungsten- carbide bur). A new scanning was performed and superimposed on the initial scan using Cumulus software. A qualitative and quantitative analysis of enamel loss was performed and statistically analyzed. Two-way ANOVA and Tukey's post-hoc test were used at a 5% significance level. Results: The use of violet lighting presented in low-cost violet flashlight and VALO Cordless resulted in significantly lower damage on enamel surface than the groups without additional violet light (P < 0.001). There were no statistical difference between low-cost flashlight and VALO Cordless. The performance of rotatory instrument is dependent of lighting type used. Conclusions: Fluorescence lighting facilitated the removal of remnant composite resin used in dental trauma splints, leading to less invasive treatment. The diamond bur presented higher enamel depth values when no additional violet light was used.