Abstract
Background Adhesive systems are constantly subjected to mechanical and chemical stresses that negatively impact the integrity and durability of the dentine-adhesive interface. Despite the lack of evidence to support or reject the clinical indication for mechanical retention, the potential further contribution of these preparations to the behavior of the composite resin-sound dentine bond has been rarely addressed. The authors evaluated by finite element analysis the effect of mechanical retention on the magnitude and distribution of stresses in a composite resin-sound dentin bonding interface when subjected to tensile and shear forces. Material and Methods A three-dimensional model was created based on three cylindrical volumes representing the sound dentin, adhesive system, and composite resin. From this main model, two models were designed to simulate dentine bonding: 1) a model with no mechanical retention, which considered flat adhesion; and 2) a model with retention, which considered four hemispherical holes on the dentine surface. Both groups were subjected to linear static analysis under tensile and shear loading of 200N. Results At the model with retentions’ bonding interface under tensile and shear loading, a concentration of Von Mises equivalent stress was observed within the retentions, with a reduction of those stresses on the bonding boundary surface. Conclusions Additional mechanical retention increases the tensile strength of the sound dentin-composite resin bonding interface, promoting a decrease in the magnitude of the stresses and their redistribution under tensile and shear loading. Key words:Adhesion, composite resins, dentine, finite element analysis.
Highlights
The adhesion of composites to dental tissues has proven to be a successful technique for dental restoration when teeth are affected by decay or trauma [1]
Some authors have suggested the use of additional mechanical retention, especially in the areas of greatest stress concentration and low adhesion [22]
The role of mechanical retention in dentine has not been adequately studied in relation to any adhesive system
Summary
Journal section: Biomaterials and Bioengineering in Dentistry Publication Types: Research doi:10.4317/jced.52144 http://dx.doi.org/10.4317/jced.52144 Kuramochi G, Borie E, Orsi IA, Del Sol M. Magnitude and distribution of stresses in composite resin and sound dentine interface with mechanical retentions. J Clin Exp Dent. 2015;7(2):e232-6. http://www.medicinaoral.com/odo/volumenes/v7i2/jcedv7i2p232.pdf
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