Apicectomy with the Er:YAG laser or bur, followed by retrograde root filling with zinc oxide/eugenol or sealer 26.

Objective: This study evaluated the influence of root resection, by means of the use of erbium:YAG laser in sealing two different materials, OZE and Sealer 26, in retrograde obturations.

Background Data: Few studies with sufficient data have been conducted in this area.

Methods: Forty uniradicular teeth were used.

Arsenic release provided by MTA and Portland cement.

Objective: The aim of the present study was to determine the release of arsenic from 2 gray Portland cements, a white Portland cement, and 2 MTAs (ProRoot and MTA-Angelus).

Study Design: The materials were manipulated and placed in plastic tubes, and the tubes were immersed in glass flasks containing water with grade reagent, pH 5.0.

Evaluation of the surface of root canal walls after utilization of endodontic rotary systems: SEM study.

The objective of the present study was to determine, by scanning electron microscopy, the aspect of root canal walls after utilization of different rotary instrumentation systems for root canal preparation. Forty-two single-rooted and straight teeth were divided into six groups, whose root canals were prepared using the following rotary systems: groups 1 and 2 - Quantec; groups 3 and 4 - Pow-R; groups 5 and 6 - Profile. Irrigation was performed with 2.

pH and calcium ion release of 2 root-end filling materials.

Objective: The purpose of this study was to evaluate the pH and calcium ion release of 2 materials used for root-end fillings and perforation repair.

Study Design: ProRoot and MTA-Angelus were placed in plastic tubes and immersed in glass flasks containing deionized water. After 3, 24, 72, and 168 hours, the water in which each had been immersed was tested to determine the pH changes and released calcium.