Abstract
Dentine bonding agents are widely used without any knowledge of their ability to ensure satisfactory clinical performance other than by clinical trials. This study is concerned with the determination of the magnitude of the tensile and shear stresses at the interface between tooth tissue and the restorative material developed as a consequence of occlusal loading. The aim is to assess the adequacy of dentine bonding agents in this respect. A two-dimensional finite element model of a buccal-lingual section through the crown of a lower first molar was created. The cavity design consisted of a Black-type cavity which was restored with dental amalgam or composite resins of different moduli. The results showed that the interfacial stresses between tooth tissues and a bonded restoration increased as the modulus increased, suggesting that adhesive failure is more likely with highly filled composite resins. Stresses at the interface appeared to be sufficient to cause debonding of composite resin restorations according to available data on bond strengths. However, current methods of estimating bond strengths of dentine bonding agents to dentine do not necessarily reflect the true stresses at the point of failure.
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