Comparison of four cordless gingival displacement systems: A clinical study.

Statement Of Problem: Although the conventional chemicomechanical cord technique is widely used, packing the cord into the sulcus may cause pain and bleeding. Cordless displacement techniques have been introduced, but a comparison of these systems is lacking.

Purpose: The purpose of this clinical study was to evaluate the efficiency and gingival response of 4 cordless gingival displacement systems.

Effect of screw-access channels on the fracture resistance of 3 types of ceramic implant-supported crowns.

Statement Of Problem: Access channels for retrieving ceramic implant-supported screw-retained crowns may decrease their fracture resistance.

Purpose: The purpose of this in vitro study was to evaluate the effect of screw-access channels on 3 types of ceramic implant-supported crowns.

Material And Methods: Sixty computer-aided designed and computer-aided manufactured (CAD-CAM) ceramic implant-supported screw-retained maxillary premolar crowns were fabricated, 30 with an occlusal screw-access channel and 30 without access channels.