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- Title
Comparison of bleaching effects when applied to white-spot lesions before or after resin infiltration: An in vitro study.
- Authors
Youssef, Al-Shaheen; Covell, David A.; Makowka, Steven; Gailey, Adam; Dunford, Robert G.; Al-Jewair, Thikriat; Haraszthy, Violet I.
- Abstract
The purpose of this study was to compare color alterations (ΔE) of white-spot lesions (WSLs) bleached before versus after resin infiltration (RI). Using the facial surfaces of bovine maxillary incisors, WSLs were created and the teeth were allocated into 2 groups (n = 45/group): bleach then RI (B-RI group) and RI then bleach (RI-B group). To determine ΔE, Commission Internationale de l'Eclairage L∗ a∗ b∗ (L∗ represents lightness, ranging from black to white [0-100]; a∗ represents green to red chromaticity [–150-+100]; and b∗ represents blue to yellow chromaticity [–100-+150]) measurements were obtained at baseline, after WSL formation, and after RI and bleaching. Representative specimens were evaluated by means of scanning electron microscopy. Statistical analyses included the Mann-Whitney U and Wilcoxon signed rank tests (P ≤.0016) and repeated measures analysis of variance (P ≤.05). No differences in ΔE were found comparing B-RI with RI-B groups or when the B-RI group was compared with bleached enamel. A statistically significant difference was found when the RI-B group was compared with bleached enamel (ΔE, 0.81; P <.001), but the difference was deemed not clinically significant. Scanning electron microscopy revealed that bleaching after RI increased surface roughness of the resin. There were no clinically significant differences in ΔE of WSLs when bleach was applied before or after RI; however, applying bleaching agent after RI roughened the surface of the resin material. Results indicate that ΔE were not clinically significantly different between WSLs bleached before versus after RI, although it is best to sequence bleaching before RI therapy, as bleaching after RI roughened the restoration's surface.
- Subjects
TREATMENT of dental caries; IN vitro studies; BIOLOGICAL models; STATISTICS; CATTLE; ANALYSIS of variance; ANIMAL experimentation; GUMS &; resins; MANN Whitney U Test; TREATMENT effectiveness; COMPARATIVE studies; ELECTRON microscopy; TOOTH whitening; DESCRIPTIVE statistics; DATA analysis; COLOR
- Publication
Journal of the American Dental Association (JADA), 2022, Vol 153, Issue 1, p39
- ISSN
0002-8177
- Publication type
Article
- DOI
10.1016/j.adaj.2021.07.017