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Effect of dental bleaching on the microhardness and surface roughness of sealed composite resins

Restorative Dentistry & Endodontics 2020년 45권 1호 p.12 ~ 12
Fernandes Renan Aparecido, Strazzi-Sahyon Henrico Badaoui, Suzuki Thais Yumi Umeda, dos Santos Paulo Henrique, Briso Andre Luiz Fraga,
소속 상세정보
 ( Fernandes Renan Aparecido ) - Sao Paulo State University School of Dentistry of Aracatuba Department of Dental Materials and Prosthodontics
 ( Strazzi-Sahyon Henrico Badaoui ) - Sao Paulo State University School of Dentistry of Aracatuba Department of Dental Materials and Prosthodontics
 ( Suzuki Thais Yumi Umeda ) - Federal University of Minas Gerais Department of Restorative Dentistry
 ( dos Santos Paulo Henrique ) - Sao Paulo State University School of Dentistry of Aracatuba Department of Dental Materials and Prosthodontics
 ( Briso Andre Luiz Fraga ) - Sao Paulo State University School of Dentistry of Aracatuba Department of Restorative Dentistry

Abstract


Objectives: The aim of this in vitro study was to evaluate the microhardness and surface roughness of composite resins before and after tooth bleaching procedures.

Materials and Methods: Sixty specimens were prepared of each composite resin (Filtek Supreme XT and Opallis), and BisCover LV surface sealant was applied to half of the specimens. Thirty enamel samples were obtained from the buccal and lingual surfaces of human molars for use as the control group. The surface roughness and microhardness were measured before and after bleaching procedures with 35% hydrogen peroxide or 16% carbamide (n = 10). Data were analyzed using 1-way analysis of variance and the Fisher test (α = 0.05).

Results: Neither hydrogen peroxide nor carbamide peroxide treatment significantly altered the hardness of the composite resins, regardless of surface sealant application; however, both treatments significantly decreased the hardness of the tooth samples (p < 0.05). The bleaching did not cause any change in surface roughness, with the exception of the unsealed Opallis composite resin and dental enamel, both of which displayed an increase in surface roughness after bleaching with carbamide peroxide (p < 0.05).

Conclusions: The microhardness and surface roughness of enamel and Opallis composite resin were influenced by bleaching procedures.

키워드

Composite resins; Hardness; Roughness; Tooth bleaching

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