Accuracy of Implant Analogs in 3D Printed Resin Models

Purpose To study the effect of implant analog system, print orientation, and analog holder radial offset on 3D linear and absolute angular distortions of implant analogs in 3D printed resin models. Materials and Methods A sectional master model simulating a 2-implant, 3-unit fixed prosthesis in a partially edentulous jaw was fabricated. Three implant analog systems for 3D printed resin models-Straumann (ST), Core3DCentres (CD) and Medentika (MD)-were tested. The corresponding scan bodies were secured onto the implants and scanned using an intraoral scanner. Models were obtained with a Digital Light Processing printer. Each implant analog system had 2 print orientations (transverse [X] and perpendicular [Y] to the printer door) and 2 analog holder radial offsets (0.04 mm and 0.06 mm), for a total of 60 models. The physical positions of the implants in the master model and the analogs in the printed resin models were directly measured with a Coordinate Measuring Machine (CMM). 3D linear distortion (Delta R) and absolute angular distortion (Absd theta) defined the 3D accuracy of the analogs in the printed models. Univariate ANOVA was used to analyse data followed by post hoc tests (Tukey HSD, alpha = 0.05). Results Mean Delta R for ST (-155.7 +/- 60.6 mu m), CD (124.9 +/- 65.0 mu m) and MD (-92.9 +/- 48.0 mu m) were significantly different (p< 0.01). Mean Absd theta was not significantly different between ST (0.57 +/- 0.48 degrees) and CD (0.41 +/- 0.27 degrees), but both were significantly different from MD (2.11 +/- 1.14 degrees) (p< 0.01). Print orientation had a significant effect on Delta R only but no discernible trend could be found. Analog holder radial offset had no significant effect on Delta R and Absd theta. Conclusions Implant analog system had a significant effect on Delta R and Absd theta. Compared to the master model, CD produced greater mean interanalog distances, while ST and MD produced smaller mean interanalog distances. MD exhibited the greatest mean angular distortion which was significantly greater than ST and CD.

Automated summary

The implant analog system significantly affects the 3D linear and absolute angular distortions of analogs in printed models. Print orientation and analog holder radial offset have minimal impact on the distortions.