Evaluation of the Efficacy and Color Stability of Two Different At-Home Bleaching Systems on Teeth of Different Shades: A Randomized Controlled Clinical Trial.

OBJECTIVE: This randomized controlled clinical trial compared the bleaching efficacy of two different at-home bleaching systems on teeth of different shades and their color stability after a 6-month follow-up. MATERIALS AND METHODS: Ninety-two patients (777 teeth) were randomly divided into three groups: (a) negative control, (b) patients treated with a custom-made tray containing 10% carbamide peroxide (10% CP/PF) (Opalescence PF), and (c) patients treated with a pre-loaded tray containing 6% hydrogen peroxide (6% HP/Go) (Opalescence Go). Teeth in all groups were divided into three sub-groups according to the VITA Classic Shade Guide: light (A1-C1), medium dark (C2-B3), and dark (A3.5-C4). Bleaching systems were performed in accordance with manufacturers' instructions for 14 days. The color values were measured at the baseline, 10 days and 14 days of bleaching, 2 weeks, and 6 months after bleaching. Three-way ANOVA and Mann-Whitney U tests were used for statistical analysis (α = 0.05). RESULTS: Irrespective of original shade, both bleaching groups showed significantly higher ΔE* values than the control groups, and the ΔE* values were significantly higher in the 10% CP/PF groups than those in the 6% HP/Go groups (p < 0.05). In both bleaching systems, the dark teeth showed higher ΔE* values than the light teeth (p < 0.05). The ΔE* values decreased significantly only in the 10% CP/PF groups after 6 months (p < 0.05). CONCLUSIONS: Both bleaching agents produced a bleaching effect, but 10% CP/PF was more effective. CLINICAL SIGNIFICANCE: A pre-loaded tray system may be used for dental bleaching, but it is still less effective than conventional a 10% carbamide peroxide system, irrespective of the initial shade. (J Esthet Restor Dent 29:325-338, 2017).

Six-month Clinical Evaluation of a Self-adhesive Flowable Composite in Noncarious Cervical Lesions.

PURPOSE: The aim of this randomized, controlled, single-center, split-mouth clinical trial was to evaluate the clinical performance of a self-adhesive flowable composite resin (SAFC) in noncarious cervical lesions in comparison with a nanohybrid composite applied with a three-step etch-and-rinse adhesive system (E&Ra/nanoC). MATERIALS AND METHODS: Eighty noncarious cervical lesions were included and assigned to one of two groups according to the split-mouth design. The cervical lesions in the experimental group were restored with an SAFC (Fusio Liquid Dentin), while a nanohybrid composite (G-aenial) applied with a three-step etch-and-rinse adhesive system (Optibond FL) was used for the control group. Clinical evaluation was performed after 1 week and again at 6 months according to FDI criteria. Data were analyzed using Wilcoxon Signed Rank and Mann-Whitney U-tests (α=0.05). RESULTS: After 6 months, 27 of the 40 SAFC restorations were in clinically unacceptable condition due to retention failure; this corresponded to a success rate of 33% compared to the success rate of 100% for the E&Ra/ nanoC restorations (p<0.05). For other criteria examined, the difference between the two groups was only statistically significant for color and translucency (p<0.05). CONCLUSION: The clinical performance of the SAFC was found to be unacceptable after 6 months of clinical use.