Comparative Evaluation of the Efficacy of ProTaper & Mtwo Rotary Retreatment System and Conventional Hand H-files for Removal of Gutta-percha from Root Canal - A Stereomicroscopic Study.

Background: Root canal retreatment aims to eliminate or substantially reduce the microbial load from the root canal and removal of previous root filling materials is the primary goal of nonsurgical retreatment.

Aim: To comparatively evaluate the effectiveness of ProTaper retreatment files, Mtwo retreatment files, and Hedstrom files along with Gates Glidden (GG) Drill by using a stereomicroscope for the detection of remaining gutta-percha after root canal retreatment using a stereomicroscope.

Materials And Methods: Forty-five test samples were divided into three experimental groups (15 samples each), such as Group A-ProTaper retreatment files; Group B-Mtwo retreatment files; Group C-Hedstrom files along with Gates Glidden Drill.

Evaluation and comparison of mechanical properties of platelet-rich fibrin membrane, fish collagen membrane, bovine collagen membrane and chorionic membrane - An SEM study.

Objectives: This study aimed to evaluate and compare the mechanical properties of platelet-rich fibrin (PRF) membrane with that of commercially available collagen membranes and chorionic membranes.

Materials And Methods: The modulus of elasticity and hardness of PRF membrane, bovine collagen membrane, fish collagen membrane, and chorionic membrane were assessed using a universal testing machine. The in vitro degradation rate was assessed by placing these membranes on a temperature-controlled shaker set for one week.