Corrosion resistance assessment of nickel-titanium endodontic files with and without heat treatment.

Objectives: The aim of this study was to evaluate the corrosion resistance of heat-treated (Reciproc and WaveOne) and non-heat-treated (ProTaper and Mtwo) superelastic nickel-titanium endodontic files when immersed in a 5.25% sodium hypochlorite solution.

Materials And Methods: Anodic polarization curves were obtained with potential sweeps that began at the open circuit potential or corrosion potential (E).

Retention of Provisional Intraradicular Retainers Using Fiberglass Pins.

Objectives: The purpose of this study was to compare the retention properties between fiberglass pins with chemically activated acrylic resin and metallic intraradicular retainers often used for the purpose of temporary prosthetic retention.

Materials And Methods: Two mechanical tests, pushout and traction, were performed on specimens distributed in three groups ( = 10) for each test; two metal pins G1: Metalpin Ângelus and G2: Provisional Pivot Jon in addition to one fiberglass pin G3: Whitepost DC-E, FGM. One-way analysis of variance (ANOVA) followed by Tukey's test was used at the level of significance α = 0.

Comparative study of the effect of ultrasound on the removal of intracanal posts.

This study sought to evaluate how ultrasound affected the removal of stainless steel and titanium posts that had been attached with two different resin cements. The crowns of 32 maxillary canines were removed, the roots were embedded in acrylic resin blocks, and the canals were treated endodontically. The specimens were randomly distributed into two groups (n = 16) according to the brand of cement and subdivided (n = 8) according to the type of post.