In vitro comparison of visual and computer-aided pre- and post-tooth shade determination using various home bleaching procedures.

Statement Of Problem: Due to inter- and intraexaminer differences, subjective evaluation of tooth color is deemed problematic.

Purpose: The purpose of this study was to evaluate the efficacy of home bleaching products, and to compare visual and computer-aided tooth shade determinations when various agents were applied.

Material And Methods: Human incisors (n=288) were stained (red wine, black tea) and allocated to 8 groups (n=36).

Primary stability of a conical implant and a hybrid, cylindric screw-type implant in vitro.

Purpose: The differences with respect to primary stability between 2 Camlog implants, a conical implant, and a hybrid cylindric screw-type implant, were investigated in vitro. The effect of underdimensioned implant bed preparation was also studied for both implant designs.

Materials And Methods: In an in vitro model the stability of different implants in fresh porcine iliac bone blocks was measured using torque moment values, the Periotest, resonance frequency analysis, and push-out testing.