Evaluation of primary stability in modified implants: Analysis by resonance frequency and insertion torque.

Background: Changes in the macrogeometry of dental implants are known to influence primary stability and the osseointegration process.

Purpose: The purpose of the present in vitro study was to evaluate the mechanical behavior of geometric changes in the apex region of dental implants.

Methods: Thirty-five cylindrical dental implants (Titamax Ti; Neodent) were machined at the apical third to reproduce the experimental groups: without apical cut (Wc), apical bi-split cut, apical tri-split cut, apical quadri-split cut (Qs).

Effect of surface treatments on the shear bond strength of luting cements to Y-TZP ceramic.

Statement Of Problem: Because zirconia is a glass-free material, alternative surface treatments such as airborne-particle abrasion or silica coating should be used for long-term bonding. However, these surface treatments in combination with different bonding agents and luting cements have not yet been studied.

Purpose: The purpose of the study was to evaluate the effect of surface treatments on the shear bond strength (SBS) of luting cements to Y-TZP ceramic.