The Accuracy, Reproducibility, and Reliability of Orthodontic Measurements Obtained from Conventional Plaster Models versus Digital Orthodontic Models

Background: Digital models are increasingly being proposed as an alternative to conventional plaster models in orthodontics. This study aims to evaluate the measurements obtained by CEREC Ortho software in terms of its accuracy, intraexaminer and interexaminer reliability, reproducibility, and time efficiency. Methods: Twenty conventional plaster models were scanned into CEREC Ortho software by three independent examiners. Linear measurements in the transverse (y-axis), anteroposterior (x-axis), and vertical (z-axis) planes acquired by the software were compared with those obtained manually using an electronic digital caliper. Results: Statistically significant differences were observed in the mean values of all measurements between the two methods; however, the majority of these differences were within clinically acceptable limits. Only a few measurements obtained by the software showed statistical difference upon assessing intraexaminer and interexaminer reliability. Manual measurements showed a higher correlation. The average software scanning time was 2.67 ± 1.30 min. The time required for obtaining measurements was significantly less for the electronic digital caliper. Conclusion: Measurements obtained using CEREC Ortho software demonstrated acceptable accuracy and reliability under laboratory conditions and may be considered a reliable complementary tool to conventional plaster models in orthodontic diagnosis and treatment planning. This study is among the first to evaluate CEREC Ortho software in terms of accuracy, intraexaminer and interexaminer reliability, reproducibility, and time efficiency.