A sparse principal component analysis of Class III malocclusions.

Objectives: To identify the most characteristic variables out of a large number of anatomic landmark variables on three-dimensional computed tomography (CT) images. A modified principal component analysis (PCA) was used to identify which anatomic structures would demonstrate the major variabilities that would most characterize the patient.

Materials And Methods: Data were collected from 217 patients with severe skeletal Class III malocclusions who had undergone orthognathic surgery.

Digital veneering system enhances microtensile bond strength at zirconia core-veneer interface.

This study investigated the effect of digital veneering system (DVS) on strengthening the bond between a zirconia core and ceramic veneer. Specimens for Groups 1 (negative control), 2 (positive control), 3, and 4 used conventional porcelain veneering technique on untreated, sandblasted, coloring agent-treated, and modifier-treated zirconia cores respectively. Group 5 used DVS, where glass ceramic veneers—produced by computer-aided milling—were fused to zirconia cores.

Investigation of anodized titanium implants coated with triterpenoids extracted from black cohosh: an animal study.

Purpose: The purpose of this study was to evaluate bone response to anodized titanium implants coated with the extract of black cohosh, Asarum Sieboldii, and pharbitis semen.

Materials And Methods: FORTY ANODIZED TITANIUM IMPLANTS WERE PREPARED AS FOLLOWS: group 1 was for control; group 2 were implants soaked in a solution containing triterpenoids extracted from black cohosh for 24 hours; group 3 were implants soaked in a solution containing extracts of black cohosh and Asarum Sieboldii for 24 hours; group 4 were implants soaked in a solution containing extracts of pharbitis semen for 24 hours. The implants from these groups were randomly and surgically implanted into the tibiae of ten rabbits.

The effect of abutment screw length on screw loosening in dental implants with external abutment connections after thermocycling.

Purpose: The aim of this study was to investigate the effects of abutment screw length on screw loosening after thermocycling.

Materials And Methods: Twenty-one grade 5 titanium (Ti) abutments were connected to grade 4 Ti implants with grade 5 Ti abutment screws. These implant/abutment screw/abutment assemblies were divided into seven groups according to the length of the abutment screw; each group included three assemblies.