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Aim: In the management of patients with discolored teeth, would home bleaching alone or in combination with inoffice bleaching give better tooth color stability than in-office bleaching? This study aimed to test the effect of different bleaching techniques on color change, stability, and hypersensitivity. Methods: A total of 21 patients were collected and randomly divided into 3 equal groups (n = 7), the first group in-office treatment with 25% hydrogen peroxide, the second group at-home bleaching with 9.5% bleaching treatment), and the third group in-office and at-home as a combined treatment. Testing for color stability was completed; at baseline, 1 day after, 1 week after, 1 month after, and 6 months after treatment using the VITA Easyshade® spectrophotometer. Testing for hypersensitivity was completed; immediately after treatment, 24 h after, 48 h after, and 1 week after treatment using a visual analog scale. Results: The current study found that there was no significant difference between mean values and standard deviation of the three bleaching techniques regarding color change (∆E) and stability in follow-up periods; hypersensitivity faded for all tested groups on a follow-up period of seven days. Conclusion: The different tested bleaching techniques showed similar clinical efficiencies in a follow-up period of 6 months. Also, the different tested techniques showed equal color stability. The different tested techniques presented a similar degree of hypersensitivity which faded in the 7 days follow-up.

Background: Remineralization of incipient carious enamel lesions is an accepted biological model in restorative dentistry. Recently self-assembly peptides are gaining wide acceptance as being a biomimetic organic analogue simulating the natural amelogenesis procedure. In parallel, Er: Cr: YSGG lasers are thought to alter tooth substrate to be more recipient for subsequently applied remineralizing agent; however, a conjunction between lasers and self-assembly peptides was not tackled in literature. Aim: This study investigates the effect of Er:Cr:YSGG laser surface pre-treatment on the remineralizing potential of biomimetic self-assembling peptide (P11-4) on incipient carious lesion in terms of surface micro-hardness assessment. Methodology: Artificial enamel lesions were created on the buccal surface of 32 specimens, and were randomly allocated to four groups; G1: control-artificial saliva, G2: self-assembly peptide (Curodont Repair), G3: Er:Cr:YSGG laser surface treatment and G4: combination of Er:Cr:YSGG laser surface treatment followed by self-assembly peptide remineralizing agent application according to manufacturer's instruction. Surface microhardness (SMH) test was assessed at baseline, after demineralization and after treatment followed with pH cycling. Values were analyzed using ANOVA and Bonferroni's post-hoc test. Results: The highest statistically significant values of SMH were found in G4 followed by G2 and G3 while the lowest values were found in group G1. Conclusion: A synergistic effect was observed between laser as a surface pre-treatment and self-assembling peptide, showing superior enamel remineralization results with the highest surface micro-hardness measurements compared to the use of laser and self-assembling peptide alone.

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