Abstract:

Our objectives were to evaluate and compare the reliability of digital and silicone impression measurements compared to direct manual measurement performed with digital caliper. Methods: 48 simulated lesions in the upper and lowers jaws of 6 porcine heads with were used. The jaws were digitized using intraoral scanner 3SHAPE TRIOS. Digitized 3-dimensional models were converted to individual stereolithography files and used with commercial software to obtain the diameter and depth measurements of each lesion. Manual measurements were carried out with a digital caliper. Silicone impressions were made for each jaw and lesion and scanned with IOS. One-sample t-tests and linear regression analyses were performed. To further graphically examine the accuracy of the different methods, Bland-Altman plots were used. Results: We found significant differences between the diameter Md+Mx measured with caliper and digitalized silicone impressions. There was fixed bias between depth Mx with IOS and digital caliper. Bland-Altman analysis showed fixed bias of one approach vs the other for the depths of lesions Fi3sh for both jaws. Conclusions: Intraoral scanner is proved to be a reliable method for linear measurements of simulated lesion in the jaws. Silicone impressions are not suitable for assessing accuracy of CBCT linear measurements.