Relationship between Canal Enlargement and Fracture Load of Root Dentin Sections.

Objective: To investigate the effect of endodontic instrumentation on fracture susceptibility of root dentin using experiments and stress analysis.

Methods: Root canals of lower premolars were enlarged with different tapers. After, teeth were cut into 2-mm sections.

Stress distribution in a premolar 3D model with anisotropic and isotropic enamel.

The aim of this study was to compare the areas of stress concentration in a three-dimensional (3D) premolar tooth model with anisotropic or isotropic enamel using the finite element method. A computed tomography was imported to an image processing program to create the tooth model which was exported to a 3D modeling program. The mechanical properties and loading conditions were prescribed in Abaqus.

Cariostatic effect of fluoride-containing restorative materials associated with fluoride gels on root dentin.

Unlabelled: Secondary caries is still the main cause of restoration replacement, especially on the root surface.

Objective: This in vitro study evaluated the cariostatic effects of fluoride-containing restorative materials associated with fluoride gels, on root dentin.

Materials And Methods: A randomized complete block design was used to test the effects of the restorative systems, fluoride regimes and the interactions among them at different distances from restoration margins.