Surgical endodontic reintervention using a modern technique: 2 case reports.

Management of post-treatment apical periodontitis after surgery--assuming the tooth is restorable, periodontally sound, and the patient desires to retain it--includes nonsurgical retreatment and surgical reintervention. This article presents 2 cases of surgical reintervention using a modern surgery technique that utilized an operating microscope, ultrasonic tips, and biocompatible materials. After the reinterventions were performed, adequate periradicular healing was observed in both cases.

Ultra-structural changes at the apical stop irradiated with CO2 laser.

Objective: This study evaluated ultra-structural dentine changes at the apical stop after CO(2) laser irradiation used during biomechanical preparation.

Background: Most studies evaluating the sealing efficiency of CO(2) lasers have been carried out after apical root canal resections and retro-filling procedures.

Methods: Sixty human canines were prepared with #1 to #6 Largo burs.

Permeability of different groups of maxillary teeth after 38% hydrogen peroxide internal bleaching.

This study evaluated the influence of internal tooth bleaching with 38% hydrogen peroxide (H2O2) on the permeability of the coronal dentin in maxillary anterior teeth and premolars. Seventy teeth (14 per group) were used: central incisors (CI), lateral incisor (LI), canines (C), first premolars (1PM) and second premolars (2PM). Pulp chamber access and transversal sectioning at 2 mm from the cementoenamel junction were performed and the specimens were divided into 2 groups (n= 7): a) no treatment and b) bleaching with 38% H2O2.

Influence of the length of remaining root canal filling and post space preparation on the coronal leakage of Enterococcus faecalis.

This study evaluated the sealing ability of different lengths of remaining root canal filling and post space preparation against coronal leakage of Enterococcus faecalis. Forty-one roots of maxillary incisors were biomechanically prepared, maintaining standardized canal diameter at the middle and coronal thirds. The roots were autoclaved and all subsequent steps were undertaken in a laminar flow chamber.

Efficacy of ultrasound in removal of intraradicular posts using different techniques.

The efficacy of ultrasound in removing cast metal posts was evaluated in this in vitro study using one or two ultrasound units and ultrasonic vibration for various lengths of time. The crowns of 30 healthy maxillary canines were removed, the roots were embedded in acrylic resin blocks, and the root canals were treated endodontically. The canals were prepared and their impressions were taken with self-curing acrylic resin.