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Influence of adhesive system on bond strength of resin composite submitted to thermomechanical fatigue

Grant number: 12/19524-7
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Effective date (Start): September 01, 2013
Effective date (End): August 31, 2015
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal Investigator:Fernanda de Carvalho Panzeri
Grantee:Renata Silva Cardoso
Host Institution: Faculdade de Odontologia de Ribeirão Preto (FORP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil


Many in vitro studies have reported the bond strength between tooth and composite using different adhesive systems. There are also many studies in the literature reporting about the longevity of this union when subjected to different aging systems. However, there is little knowledge about the longevity of these treatments when subjected to thermomechanical fatigue. Therefore, this study will evaluate the efficacy of conventional three-steps and two steps self-etch adhesive systems in the bond strength of composites submitted to thermomechanical fatigue. Forty sound human molars will have their occlusal surfaces sectioned to dentin, and flattened in the manual polishing machine (Struers) with water abrasive papers in decreasing order of granulation (100, 320, 600, 800, 1200). The teeth will be randomly assigned into four groups (n = 10) according to the adhesive system used, and treatment of the samples, as follows: GI - conventional three-step adhesive system (Adper Scotchbond Multi-Purpose, 3M ESPE) + thermomechanical fatigue, GII - conventional three-steps adhesive system + storage in artificial saliva for 30 days, GIII - two-steps adhesive system (Clearfil SE Bond, Kuraray Medical Inc.) + thermomechanical fatigue and GIV - two-steps adhesive system + storage in artificial saliva for 30 days. After adhesive systems application, the teeth will be restored with Filtek Z350 composite (3M ESPE) and submitted to treatments. After, restored teeth will be sectioned perpendicularly to the adhesive interface with a double face diamond disc (SYJ - 150 Digital Low-Speed Diamond Saw 4) in "stick" format (1.0 x 1.0 mm), according to the non-trimming technique, and will be coupled into a Universal Testing Machine (Emic - 0.5 mm/mim) to perform the microtensile test. The bond strength values will be submitted to normality test and appropriate statistical analysis of the distribution of the sample will be performed. The failure modes and the integrity of the hybrid layer will be analyzed by Scanning Electron Microscope (SEM - JEOL JSM 5410) for qualitative analysis. (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)
VIVANCO, ROCIO GENG; CARDOSO, RENATA SILVA; SILVA SOUSA, ANA BEATRIZ; CHINELATTI, MICHELLE ALEXANDRA; DE FREITAS VINCENTI, SERGIO AUGUSTO; TONANI-TORRIERI, RAFAELLA; PANZERI PIRES-DE-SOUZA, FERNANDA DE CARVALHO. Effect of thermo-mechanical cycling and chlorhexidine on the bond strength of universal adhesive system to dentin. HELIYON, v. 6, n. 4, . (12/19524-7)

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