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KMID : 1023820210130040205
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The Journal of Advanced Prosthodontics
2021 Volume.13 No. 4 p.205 ~ p.215
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Effect of different arch widths on the accuracy of three intraoral scanners
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Kaewbuasa Narin
Ongthiemsak Chakree
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Abstract
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PURPOSE: The purpose of this study was to compare the accuracy of three intraoral scanner (IOS) systems with three different dental arch widths.
MATERIALS AND METHODS: Three dental models with different intermolar widths (small, medium, and large) were attached to metal bars of different lengths (30, 40, and 50 mm). The bars were measured with a coordinate measuring machine and used as references. Three IOSs were compared: TRIOS 3 (TRI), True Definition (TD), and Dental Wings (DW). The relative length and angular deviation of both ends of the metal bars from the scan data set (n = 15) were calculated and analyzed.
RESULTS: Comparing among scanners in terms of trueness, the relative length deviation of DW in the small (1.28%) and medium (1.08%) arches were significantly higher than TRI (0.46% and 0.48%) and TD (0.33% and 0.18%). The angular deviation of DW in the small (1.75°) and medium (1.83°) arches were also significantly greater than TRI (0.63° and 0.40°) and TD (0.55° and 0.89°). Comparing within scanner, the large arch of DW showed better accuracy than other arch sizes (P < .05). On the other hand, the larger arch of TD presented a greater tendency of angular deviation in terms of trueness. No significant differences were found in terms of trueness between the arch widths of TRI group.
CONCLUSION: The different widths of the dental arches can affect the accuracy of some intraoral scanners in full arch scan.
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KEYWORD
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Intraoral scanner, Accuracy, Digital impression, Arch width, Arch size
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