Combined Dental Bleaching Protocols and Time Required to Achieve Satisfactory Color

Effect of a Single Prior Session of In-office Dental Bleaching on Time Required to Obtain Satisfactory Tooth Color With At-home Bleaching

This parallel, randomized, and controlled clinical trial will assess the effect of a single prior session of in-office dental bleaching on time required to achieve satisfactory tooth color with at-home bleaching. Participants enrolled will randomly allocated to receive or not a single session of dental bleaching with 35% hydrogen peroxide applied for 45 min. Following, all participants will use customized trays filled with 10% carbamide peroxide for 1h per day until obtain satisfactory results. The primary outcome will be the number of days necessary to obtain satisfactory tooth color. Furthermore, tooth sensitivity and color changes measured with spectrophotometer will be assessed.

Inclusion Criteria:

• Good general and oral health;
• Upper canines darker than the tab 2.5M2 at VITA Bleachedguide 3D-MASTER® (Vita-Zahnfabrik, Bad Sackingen, Germany) scale.

Exclusion Criteria:

• Presence of non-treated caries or periodontal disease;
• Prior tooth hypersensitivity;
• Presence of gingival recession;
• Teeth with cracked enamel or any hypoplasia;
• Patients using oral removable or fixed orthodontic appliances;
• Patients were pregnant or breastfeeding.