Journal of Prosthodontics News   February 3, 2020

Influence of Tooth Preparation Design and Scan Angulations on Accuracy


Now online in the Journal of Prosthodontics, Drs. Rami Ammoun, Montry S. Suprono, Charles J. Goodacre, Udochukwu Oyoyo, Caroline K. Carrico, and Mathew T. Kattadiyil share the findings from their in vitro study on the influence of tooth preparation design and scan angulations on the accuracy of intraoral digital scanners.Dr. Ammoun presented this research as part of the Sharry Competition at the 49th ACP Annual Session and placed third.

The authors prepared eight complete coverage (CC) and partial coverage (PC) tooth preparations and scanned them using two IOS, the 3Shape Trios (TRI) and the 3M True Definition (TRU).

Adjacent teeth are known to hinder the scanning direction so all teeth preparations were scanned in the presence and absence of adjacent teeth.

The results of the study showed that there were differences between the type of intraoral scanners, presence of adjacent teeth, and preparation design. Partial coverage preparation scans revealed significantly less accuracy compared to complete coverage preparation scans. The 3Shape Trios scanner performed better than 3M True Definition scanner for scanning partial coverage scans but the performance was comparable for complete coverage scanning.

The authors also noted that the most inaccuracies occurred in the interproximal region for both types of tooth preparations (CC and PC), which proves that limitation in scan angulations can lead to inaccuracies in scanning.

Ammoun R, Suprono MS, Goodacre CJ, et al: Influence of Tooth Preparation Design and Scan Angulations on the Accuracy of Two Intraoral Digital Scanners: An In Vitro Study Based on 3‐Dimensional Comparisons. J Prosthodont. doi:10.1111/jopr.13148


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