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Volume 42 , Issue 5
September/October 2022
Pages 675–681

Effects of Two In-Office Bleaching Agents with Different Compositions on the Bond Strength to Enamel

Silvia Renata Marski, DDS, MSc/Thamires Fortes Ramos da Silva, DDS/Maria Luiza Andrade Balduino, DDS/Carolina Oliveira de Lima, DDS, MSc, PhD/Renata Antoun Simão, DDS, MSc, PhD/Maíra Prado, DDS, MSc, PhD

PMID: 36044700
DOI: 10.11607/prd.5943

This study evaluates the effect of two in-office bleaching agents with different compositions on the bond strength to enamel surface. Fifty bovine teeth were divided into five groups (n = 10 teeth per group), according to the bleaching agent used and the time elapsed to perform the restorative procedures: restorative procedures performed without bleaching (control group); bleaching with 35% hydrogen peroxide (HP), with restorative procedures 24 hours or 7 days after bleaching (HP/24h and HP/7d groups, respectively); and bleaching with 35% HP with calcium compost, with restorative procedures 24 hours or 7 days after bleaching (HP AutoMixx/24h and HP AutoMixx/7d groups, respectively). The specimens were stored at 37ºC in artificial saliva. Restored teeth were submitted to a micro-shear bond strength test. The specimens were analyzed using a stereoscope to determine the fracture pattern, classified as adhesive, cohesive, or mixed. The results of the bond strength test were evaluated by analysis of variance, with significance set at P < .05. The groups showed similar bond strength values without significant difference among them (P > .05). There was a predominance of the adhesive-type fracture pattern in all groups. The bleaching agents with different compositions showed similar bond strength values when the restoration was performed 24 hours and 7 days after bleaching, and the results were similar to the control group.

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