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Online ISSN 1827-174X
Pedrazzi V. 1, Del Ciampo J. O. 2, Panzeri H. 1, Helena Guimarães Lara E. 2, Mardegan Issa J. P. 1, Do Nascimento C. 1
1 Department of Dental Materials and Prosthodontics Faculty of Dentistry of Ribeirão Preto University of São Paulo, São Paulo, Brazil
2 Department of Pharmaceutical Sciences Faculty of Pharmaceutical Sciences of Ribeirão Preto University of São Paulo, São Paulo, Brazil
Aim. An intra-buccal acrylic bioadhesive device designated for drug programmed release that can stay adhered to dental enamel, and also on removable prosthetic restorations, with preventive and/or therapeutic purpose for a large clinical applications based on polymethyl methacrylate/methyl methacrylate/2 hydroxiethyl methacrylate (PMMA/MMA/HEMA) was developed, using the sodium fluoride as an active principle. This bioadhesive was evaluated for its shear bond strength when bonded with different adhesive systems.
Methods. Two substrates (recently extracted human teeth and acrylic prosthesis basis) were used to obtain the 96 test-specimens. Four adhesive systems (Cyanoacrylate ester, 3M Concise Enamel Bond Resin with or without previous enamel etching, MMA/HEMA or PMMA/MMA/ HEMA) were chosen for the fixation of the bioadhesives to substrate. Artificial saliva or distilled water was used as medium for maintaining the specimens until test.
Results. Statistical analysis showed that the interaction bioadhesives/acrylic prosthesis basis/cyanoacrylate ester adhesive was the most resistant to the physical removal by shearing.
Conclusion. The newly rounded semi-convex format of acrylic device developed in this study presented satisfactory shear bond strength and might contribute to the comfort of intra-buccal use.