Comparative study of adhesive systems applied to different regions of dental substrate

Veridiana Camilotti,Márcio José Mendonça,Priscilla Busatoa Do Monte Ribeiro,Mario Alexandre Coelho Sinhoretic,Máx Dobrovolski,Virgínia Bosquiroli,Lyvia Karla Cerci Ferreira Bertacchinib

doi:10.15448/1980-6523.2016.4.22482

Veridiana Camilotti, Márcio José Mendonça + Show 5 more

Open Access

https://doi.org/10.15448/1980-6523.2016.4.22482

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Abstract

OBJECTIVE: The aim of this study was to evaluate the bond strength (BS) of different self-etching adhesive systems to bovine dentin.METHODS: For this purpose, 50 teeth were flattened with silicon carbide abrasive papers and randomly divided into 5 groups: SB – Single Bond Plus; Group AEO – Adper Easy One; Group ADH – AdheSE; Group ASE – Adper SE Plus and Group Clear – Clear Fill. After adhesive system application, 5 Tygon cylinders (1.8 mm×2 mm) were placed on the vestibular surface of each tooth, filled with resin composite (Filtek Z350) and light activated. Three composite resin cylinders were fabricated for each bovine crown, one being located in the incisal region, one in the middle third and one in the cervical region, totaling 30 composite resin test specimens (TS) for each group. The TS were submitted to the microshear bond strength test in a Universal Test Machine Kratos), at a cross-head speed of 0.5 mm/min.RESULTS: The BS was calculated and analyzed by ANOVA (one-way) and Tukey’s test (p<0.05). The highest BS values were obtained in Group SB and there were no significant differences between the adhesive systems tested in the middle and cervical thirds. In the fracture type analysis it was found that adhesive failure was dominant for all groups.CONCLUSION: The conventional two-step adhesive system SB presented the highest bond strength mean to bovine dentin for all the regions.

Highlights

To improve the clinical and biologic longevity of resin composite restorations, the interaction of the adhesive system with the dental structure is of great importance
The conventional types are characterized by the presence of a demineralizing agent, 37% phosphoric acid, and a combination of primer and resin adhesive that may be in the same bottle, denominated a conventional 2-step adhesive system, or in separate bottles, considered a conventional 3-step adhesive system
The result of the ANOVA showed that the conventional adhesive system ASB presented the highest bond strength values with statistical significance, in comparison with the other adhesive systems

Summary

Introduction

To improve the clinical and biologic longevity of resin composite restorations, the interaction of the adhesive system with the dental structure is of great importance. Adhesive systems are generally divided into conventional and self-etching types [2]. Phosphoric acid is capable of completely removing the smear layer after etching and can cause collapse of the collagen fibers at the time of drying the demineralized dentin. This results in incomplete infiltration into the demineralized areas, and formation of zones of pores under the hybrid layer [3]. Post-operative sensitivity has been associated with the action of phosphoric acid in conventional adhesive systems, which motivate the development of a self-etching primer [4]

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Results

Conclusion