Assessment of the accuracy of linear measurements of digitalized orthodontic models

Vol. 15 – Number 59 – 2022 Original article Page 71-76 Assessment of the accuracy of linear measurements of digitalized orthodontic models Daniane Deliberalli Noedel¹ Jéssica Klöckner Knorst¹ Lara Jaiane Norbert Furlan¹ Vilmar Antônio Ferrazzo¹ Gustavo Dotto¹ Renésio Armindo Grehs¹ Abstract Aim: This study has aimed to compare the accuracy of linear measurements made, according to the Moyers method, on plaster casts by the manual method using a pachymeter in digital 3D models digitalized by a desktop scanner and in 3D digital models scanned by Multislice Computed Tomography using the CTdBem protocol. Method: A single operator has selected 90 plaster casts of the mandibular arch for analysis of mixed dentition. The methods tested and manual method were compared by using the paired t-test. To assess the agreement between the methods, Pearson’s correlation was performed. The Bland-Altman plot was built to evaluate the difference among the measurements for each sample. Results: There were no significant differences between scanner and Multislice CT measurements when compared to the manual method measurements (p> 0.05). Both digital methods have had a high and significant correlation with the manual method with coefficients of 0.98 and 0.97 for the scanner and Multislice CT method, respectively (p<0.01). Conclusions: The digital models obtained by means of the desktop scanner and Multislice Computed Tomography by means of CTdBem protocol produced linear measurement and with good accuracy, compatible with the manual measurements made on plaster casts. Descriptors: Dental models, mixed dentition, three-dimensional imaging, Multidetector Computed Tomography. ¹ Department of Stomatology – UFSM. DOI: 10.24077/2022;1559-02001140