Accuracy of three-dimensionally printed retainers and aligners : A systematic review.

Background: With the constant improvement of photopolymerizable resin, direct three-dimensional (3D) printing of retainers and aligners (R&A) has gained popularity in recent years. The primary objective of this research was to systematically evaluate the evidence regarding the accuracy of 3D-printed R&A in terms of trueness and precision (T&P).

Methods: Electronic database searches were performed on PubMed, Science Direct, Web of Science, Scopus, Ovid, and Clinicaltrial.