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Dental bleaching with violet light: effects on chromatic change, bonding strength, hybrid layer nanohardness and collagen strength

Grant number: 17/07000-7
Support type:Scholarships in Brazil - Master
Effective date (Start): September 01, 2017
Effective date (End): August 31, 2019
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal researcher:André Luiz Fraga Briso
Grantee:Ana Carolina Souza Barboza
Home Institution: Faculdade de Odontologia (FOA). Universidade Estadual Paulista (UNESP). Campus de Araçatuba. Araçatuba , SP, Brazil


The purpose of this project will be to investigate the bonding strength of resin restorations in dentin, as well as to analyze the nanohardness of the hybrid layer and the cohesive strength of the dentin collagen, after performing different bleaching techniques. Therefore, initially 75 previously selected bovine teeth will be randomly distributed in the following groups: GI- Without bleaching; GII - Physical bleaching with violet LED light and GIII - Bleaching gel based on hydrogen peroxide at 35%). Then, 45 teeth will be destined to the analysis of the chromatic alteration spectrometry of reflection, being later prepared, restored and sectioned in sticks. Half of the samples will be subjected to the bonding strength and nanoindentation tests of the hybrid layer, while the rest will undergo 10000 thermal cycles before the evaluations. The remaining 30 teeth will be used to analyze the cohesive strength of the collagen (n = 10) that will be performed immediately after the bleaching treatments, as well as after the collagenase action. The data obtained from the bonding strength, the nanohardness and the cohesive strength of the collagen will be submitted to statistical tests of normality and specific tests to verify the significance between the averages. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SOUZA BARBOZA, ANA CAROLINA; DOS SANTOS, PAULO HENRIQUE; DO VALE, LUANA RIBEIRO; GALLINARI, MARJORIE DE OLIVEIRA; ASSMANN, ANDRE; PIMENTA VIDAL, CRISTINA MATTOS; FAGUNDES, TICIANE CESTARI; FRAGA BRISO, ANDRE LUIZ. Dental bleaching with violet LED: Effects on dentin color change, resin-dentin bond strength, hybrid layer nanohardness and dentinal collagen biostability. Photodiagnosis and Photodynamic Therapy, v. 33, MAR 2021. Web of Science Citations: 0.
GALLINARI, MARJORIE DE OLIVEIRA; ANGELO CINTRA, LUCIANO TAVARES; SOUZA BARBOZA, ANA CAROLINA; ALVES VALENTIM DA SILVA, LIVIA MARIA; DE ALCANTARA, SIBELE; DOS SANTOS, PAULO HENRIQUE; FAGUNDES, TICIANE CESTARI; FRAGA BRISO, ANDRE LUIZ. Evaluation of the color change and tooth sensitivity in treatments that associate violet LED with carbamide peroxide 10 %: A randomized clinical trial of a split-mouth design. Photodiagnosis and Photodynamic Therapy, v. 30, JUN 2020. Web of Science Citations: 0.
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
BARBOZA, Ana Carolina Souza. Clareamento dentário com LED violeta : efeitos na alteração cromática, resistência de união, nanodureza da camada híbrida e resistência do colágeno. 2019. Master's Dissertation - Universidade Estadual Paulista (Unesp) Faculdade de Odontologia.

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