Changes in the surface of bone and acid-etched and sandblasted implants following implantation and removal.

Objective: The aim of this study was to determine whether there are any changes in the surface of bone or implant structures following the removal of a screwed dental implant.

Materials And Methods: For this, six individual samples of acid-etched and sandblasted implants from three different manufacturers' implant systems were used. They were screwed in a D1 bovine bone, and they were removed after primary stabilization.

Effects of NaOCl, EDTA and MTAD when applied to dentine on stress distribution in post-restored roots with flared canals.

Aim: To evaluate the effect of NaOCl, EDTA and MTAD on the stress distribution and levels in roots with flared canals and three different aesthetic post systems using finite element stress analysis (FEA).

Methodology: Three-dimensional (3D) FEA models simulating a maxillary incisor with excessive structural loss and flared root canals were created. The dentine of the first models of each post group was assumed as homogenous, whereas the others were deemed as having their elastic modulus affected up to 100 μm deep as a result of irrigation protocol (5.

[PH changes of different cements].

Some properties are required in dental cements used in fixed restorations. One of them is the acidic characteristic of the material since (OH)- ions released during the setting phase may have undesirable effects on the pulp. In this study three different luting cements were tested regarding to their PH values during setting reaction and was found that cements used caused PH changes.