Degree of Conversion of Nanoceramic and Microhybrid Composites Activated by Different Polymerization Modes at Different Intervals: An Comparative Study.

Introduction: This is an study to evaluate the degree of conversion (DC) of nanoceramic and microhybrid composites activated by different polymerization modes at different intervals.

Aim: To determine the DC of two resin composites at different time intervals and modes of polymerization on DC.

Materials And Methods: Two commercially available composite resins-nanoceramic (Ceram X, Dentsply) and microhybrid (Spectrum TPH, Dentsply)-were used in this study.

Shear bond strength of eugenol- and non-eugenol-based endodontic sealers to gutta-percha and dentin: An in vitro study.

Aims: a) To evaluate the bond strength of eugenol- and non-eugenol-based endodontic sealers to gutta-percha and dentin and b) To make a comparative evaluation of the bond strength of sealers to gutta-percha and dentin.

Material And Methods: Seventy-two specimens were used in this study, which was divided into two groups - group I consisting of 36 freshly extracted human molars with 2 mm coronal cut surface; and group II consisting of gutta-percha disks of 10 mm diameter and 2 mm thickness embedded in 36 plaster of Paris specimens. Group I was further divided into three subgroups: subgroup 1, subgroup 2, and subgroup 3, consisting of 12 teeth each; and group II was further divided into three subgroups: subgroup 1, subgroup 2, and subgroup 3, consisting of 12 plaster specimens each.