[Restorative treatment of cervical tooth lesions in aspect of biomechanics].

The study describes an appropriate treatment approach to the cervical tooth lesions from biomechanical point of view. The occlusal loading plays an essential role in development and failure of restorative treatment of this kind of defects. Resulting from these loading the stresses and issuing strain accumulate just in cervical region of the teeth and they influence both the marginal adaptation and sealing of the restoration. The shear and tensile stresses are responsible for breaking the bonds between the tooth tissues and restoration, leading to its destruction. The state of stress is dependent, above all, on direction of loading forces and on E (the elasticity modulus of applied material). For cervical filling a flexible material should be chosen, characterized by the low E modulus, due to less injurious distribution of interfacial stresses. It is necessary to equilibrate occlusal contacts before all filling procedures. Elimination of lateral and oblique forces can be achieved by occlusal equilibration.