Storyboard

Structural interventions restore the physical integrity of dental and bone tissues through cavity preparation, restoration with dental materials, implants and bone surgery. Restorations (composite, amalgam, ceramic) must replicate the mechanical properties of the tissue they replace to avoid stress concentrations at the tooth-restoration interface. The elastic modulus of the composite (~515 GPa) is lower than that of enamel (7090 GPa), which produces a step of stiffness. Titanium implants (Ti-6Al-4V, E 110 GPa) are much stiffer than the alveolar bone (E 115 GPa), generating stress concentrations in the pericrestal bone crest (stress shielding phenomenon). The distribution of loads in a restoration follows the mechanics of composite materials. Polymerization shrinkage of the composite (~13% by volume) generates residual shrinkage stresses that can exceed the adhesive strength at the interface. The design of the cavity preparation (C factor = bonded surfaces/free surfaces) determines the contraction stress experienced by the adhesive system.

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ID:('ky', 277)

Description

ID:(0, 277)