Effect of Chemical and Light Bleaching Techniques on Color Change, Dentin Hypersensitivity and Patient Satisfaction

Aim of The Study This study aims is to evaluate color change, dentin hypersensitivity and patient satisfaction after different bleaching techniques at different time intervals. Materials(subjects)\& Methods * Chemically activated bleaching kit. * Light activated bleaching kit. This will be a randomized single-blind clinical trial, patients attending the faculty. Thirty-two patients will be selected for the study. Oral hygiene steps will be taken at the first visit, as well as scaling and polishing of the teeth. Patients will be divided into two groups according to the bleaching technique used. Group 1: chemical bleaching, Group 2: light activated bleaching. Color change measurements: Tooth color measurements will be performed at baseline T0, immediately after bleaching treatment T1, 1-week T2 and 1-month T3 after bleaching using a spectrophotometer. The whiteness index will be also calculated to verify the perceived bleaching effect. Dentin hypersensitivity will be evaluated at baseline D0, immediately after bleaching treatment D1, 1 week (D2) and 3 month (D3) after bleaching using Visual Analogue Scale VAS numbered from 0 (no pain) to 10 (maximum extreme pain). At the end of the study (3 months) a questionnaire was given to the patients to assess their satisfaction with bleaching treatment.

Inclusion Criteria: * Presence of six sound maxillary anterior teeth. * Patient having brown or yellowish stains. * Good oral health maintained by routine brushing. * Generalized tooth staining ranging from A2 or darker according to the value-oriented shade guide (Vita easy shade). * Patient is willing to sign a consent form and can attend all recall visits. Exclusion Criteria: * Existing anterior crowns or any restorations on anterior teeth that will interfere with the bleaching process. * Smoker or alcoholic patient. * Patients suffering from active periodontal diseases and exposed roots. * Patient who undergone previous whitening procedure. * Pregnant and lactating women.