Abstract
Objective: The purpose of this study is to evaluate the influence of the type of scanner and scanning direction on the accuracy of the final cast. Material and Methods: A partial master cast was used as a reference. A total of 128 scans were obtained and divided into two groups: the conventional method and the digital method. The digital group was divided into three groups: TRIOS 3, Omnicam and CS 3600. Each of these groups was subdivided according to the scanning direction, and each scan was overlaid on the digital reference cast to measure the trueness and precision of the procedures. Results: The overall precision values for the type of impression were 59.89 ± 13.08 mm for conventional and 13.42 ± 4.28 mm for digital; the values for trueness were 49.37 ± 19.13 mm for conventional and 53.53 ± 4.97 mm for digital; the scanning direction trueness values were 53.05 ± 4.36 mm for continuous and 54.03 ± 5.52 mm for segmented; and the precision values were 14.18 ± 4.67 mm for continuous and 12.67 ± 3.75 mm for segmented (p> 0.05). For the scanner type, the trueness values were 50.06 ± 2.65 mm for Trios 3, 57.45 ± 4.63 mm for Omnicam, and 52.57 ± 4.65 mm for Carestream; and those for precision were 11.7 ± 2.07 mm for Trios 3, 10.09 ± 2.24 mm for Omnicam, and 18.49 ± 2.42 mm for Carestream (p <0.05). Conclusions: The digital impression method is the most favorable method regarding precision; in terms of trueness, there are no differences between the types of impressions. KEYWORDS Conventional impression; Intra oral impression; Accuracy; Trueness.
Highlights
A s a result of technological developments, we are surrounded by resources that aim to make our daily activities more practical, comfortable and agile
Onlays, crowns, veneers and fixed prostheses may be manufactured by means of computer-aided design (CAD) and milling (CAM) [8] Definitive restorations can be performed in a dental office or a lab that receives the data virtually [9]
The purpose of the present study was to evaluate the accuracy by means of trueness and precision considering the type of impression technique, scanning direction and their interaction
Summary
A s a result of technological developments, we are surrounded by resources that aim to make our daily activities more practical, comfortable and agile. Numerous dental procedures require a positive reproduction of teeth and other structures of interest, as well as of the antagonist arch [2,3] This stage needs to be carried out accurately to ensure good adaptation of prosthetic pieces to teeth, as well as greater longevity [4,5,6,7] In this context, CAD/CAM (computeraided design/computer-aided manufacturing) has a central role, and it has gradually become part of dentist and technician routines. By means of data and algorithm calculations, the software generates an image on a computer screen, which results in a virtual and three-dimensional model [8] Another great advantage of scanning is the reduction in the number of stages along with the patient’s acceptance, since the procedure does not generate anxiety and does not interfere with natural breathing. The purpose of the present study was to evaluate the accuracy by means of trueness and precision considering the type of impression technique, scanning direction and their interaction
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