Dimensional accuracy of extrusion- and photopolymerization-based 3D printers: In vitro study comparing printed casts.

Statement Of Problem: Reliable studies comparing the accuracy of complete-arch casts from 3D printers are scarce.

Purpose: The purpose of this in vitro study was to investigate the accuracy of casts printed by using various extrusion- and photopolymerization-based printers.

Material And Methods: A master file was sent to 5 printer manufacturers and distributors to print 37 identical casts.

Clustering effects of oral conditions based on clinical and radiographic examinations.

Objectives: The intra-class correlation coefficient (ICC) is a measure of intra-subject clustering effects. A priori estimates of the ICC and the associated design effect (DE) are required for sample size estimation in clustered studies, and should be considered during their analysis, too. We aimed to determine the clustering effects of carious lesions, apical lesions, periodontal bone loss, and periodontal pocketing, assessed in clinical or radiographic examinations.