A comparison of preload values in gold and titanium dental implant retaining screws.

This in vitro investigation compared the effect of using either gold or titanium retaining screws on preload in the dental implant- abutment complex. Inadequate preload can result in screw loosening, whilst fracture may occur if preload is excessive. These are the most commonly reported complications in implant-retained prostheses, and result in unscheduled, costly and time-consuming visits for the patient and the clinician.

The effects of hydrochloric acid on all-ceramic restorative materials: an in-vitro study.

Objectives: The aim of this in-vitro study was to assess the long-term effects of hydrochloric acid on the surface roughness of three all-ceramic restorative materials CEREC VITABLOC Mark II CAD, IPS Empress CAD and IPS e.max CAD.

Materials And Methods: Six cylindrical specimens (10mm diameter, 3mm height) of each material type were prepared, using the CEREC CAD/CAM machine.

Evaluation of surface characteristics of titanium and cobalt chromium implant abutment materials.

Introduction: Micro-organism adhesion and plaque formation is affected by surface free energy (SFE), surface roughness, hydrophilicity, surface chemistry, surface charge and the presence of proteins.

Aims: The aim of this study was to assess and compare surface characteristics of surgical grade cobalt chromium alloy (CCM) and of commercially pure titanium (cpTi).

Method: Nine metallic cylinders were machined to precise standards from each material.

Students' vulnerability in educational research.

Dental teaching institutions in South Africa recently implemented "learner-centred" curricula and expected educators to alter their teaching styles accordingly, but perhaps without providing adequate training in this paedagogical philosophy. At the same time, the lecturers were required to conduct evidence-based research to evaluate the outcomes. Thus, clinicians/lecturers also became researchers, using their own students or student material for assessment purposes.