Precision and trueness of dental models manufactured with different 3-dimensional printing techniques.

Introduction: In this study, we assessed the precision and trueness of dental models printed with 3-dimensional (3D) printers via different printing techniques.

Methods: Digital reference models were printed 5 times using stereolithography apparatus (SLA), digital light processing (DLP), fused filament fabrication (FFF), and the PolyJet technique. The 3D printed models were scanned and evaluated for tooth, arch, and occlusion measurements.

Failure of setting of mineral trioxide aggregate in the presence of fetal bovine serum and its prevention.

Introduction: The purpose of this study was to examine the effect of fetal bovine serum (FBS) on the setting of 2 white mineral trioxide aggregates (MTAs) and to determine if calcium chloride (CaCl(2)) alters the setting behavior of both MTAs under this condition.

Methods: Two types of MTA cements (ProRoot MTA [Dentsply Tulsa Dental, Tulsa, OK] and MTA-Angelus [Angelus Dental Solutions, Londrina, Brazil]) were mixed with either distilled water (DW) or 10% CaCl(2) solution. Mixed MTA was placed in a polyethylene mold, and each mold was then placed in saline or FBS-soaked Oasis.