Influence of selective acid etching on microtensile bond strength of a self-adhesive resin cement to enamel and dentin
Lúcia Trazzi PrietoI; Cíntia Tereza Pimenta AraújoII; Maria Malerba Colombi HumelII; Eduardo José Souza-JuniorI; Carlos Tadeu dos Santos DiasIII; Luís Alexandre Maffei Sartini PaulilloIV
IDDS, MS student, Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, São Paulo, Brazil
IIDDS, MS, PhD student, Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, São Paulo, Brazil
IIIAgronomic engineer, MS, PhD, Associate professor, Department of Exact Science, ESALQ University of São Paulo, Piracicaba, SP, Brazil
IVDDS, MS, PhD, Full professor, Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, São Paulo, Piracicaba, Brazil
ABSTRACT
AIM: To evaluate the selective acid etching of enamel and dentin on microtensile bond strength (μTBS) of a self-adhesive resin cement.
METHODS: Forty-eight bovine teeth were selected and had the buccal surface ground to obtain a flat dentin (n=24) or enamel (n=24) surface. Z250 composite resin blocks (4 x 3 x 8 mm) were prepared for cementation at enamel and dentin. Each substrate received three experimental resin cementation strategies: 1) 37% phosphoric acid etching before the application of RelyX Unicem; 2) application of RelyX Unicem alone; 3) RelyX ARC as a control. Samples were light-cured using a halogen light (Optilux 501, 700mW/cm2), for 40 s. Hourglass-shaped specimens were obtained and submitted to a tensile strength at a crosshead speed of 0.5 mm/min in a universal testing machine. For statistical analysis, data were submitted to ANOVA and Tukey's test at a pre-set alpha (a=0.05).
RESULTS: RelyX Unicem showed similar bond strength value (16.5 MPa) when compared to the pretreatment with acid etching (11.9 Mpa) and to the conventional resin cement (18.1 MPa) for enamel. All luting strategies presented similar dentin bond strength, but significantly lower than enamel bond strength.
CONCLUSIONS: Acid etching prior to RelyX Unicem application did not improve microtensile bond strength for enamel and dentin.
Keywords: resin cement, bond strength, dental enamel, dentin, dental acid etching.
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Correspondence to:
Eduardo José Souza-Junior
Piracicaba Dental School, University of ]]>
Campinas - UNICAMP
Department of Restorative Dentistry, P.O. BOX 52
Avenida Limeira, 901, Areião,13414-903
Piracicaba - SP - Brazil
Phone: 55 - 19 - 8841 5291
E-mail: edujcsj@gmail.com
Received for publication: June 26, 2010
Accepted: October 22, 2010