"Comparative evaluation of effect of toothbrush-dentifrice abrasion on surface roughness of resin composites with different filler loading:" An study.

Objectives: This study evaluated the effect of toothbrush-dentifrice abrasion on the surface roughness of two restorative posterior resin composites, Filtek Z250 and Z350 after simulated toothbrushing twice daily for a period of 3 months.

Methods: All the specimens were polished and cleaned and surface topography was evaluated by Veeco di CP-II Atomic Force Microscope (AFM) at six different points; similarly, these specimens were again subjected to evaluation after simulated toothbrushing using dentifrice. The surface roughness evaluation was done for AFM images using software made available and the factor measured were average roughness (Ra) and maximum peak to valley distance R(p v).

Evaluation of Mechanical Properties of Newer Nanoposterior Restorative Resin Composites: An Study.

Introduction: Tooth coloured restorative materials are subjected to various physical, mechanical conditions in oral conditions. Many newer composites with improved physical and mechanical properties are introduced for clinical use. There are not many clinical studies on recent composites.