Presentation Information
[P-31（E）]Influence of inter-tooth distance and proximal axial wall height on the scanning accuracy of intraoral scanners
*So-Yeun Kim1, Keunbada Son1, Ji-Min Lee1, Kyu-Bok Lee1 (1. Kyungpook National University)
[Objective]
This study aimed to investigate how the height of the proximal axial wall of a prepared tooth and the distance between the prepared tooth and adjacent teeth affect the scanning accuracy of intraoral scanners.
[Method]
Ten working casts with maxillary first molars prepared for zirconia crowns were used. Two different IOSs, i700 (MEDIT, South Korea) and CS3600 (Carestream Dental, USA), were used to scan each working cast 15 times 1). To compare the accuracy of the IOSs, a high-precision laboratory scanner (E1, 3Shape, Denmark) was used to obtain reference data. 3D analysis software (Geomagic Control X, 3D Systems, USA) was employed to align the scanned data with the reference model and to analyze root-mean-squared (RMS) deviations. Statistical analysis was performed using SPSS (IBM Corp., USA), including the Shapiro-Wilk normality test, independent t-test, one-way analysis of variance (ANOVA), Pearson correlation analysis, and multivariate analysis of variance (MANOVA) to assess the effects of different factors on scanning accuracy.
[Results and Discussion]
The i700 scanner demonstrated higher accuracy than the CS3600 in all cases. When the inter-tooth distance was ≥2.0 mm and the axial wall height was <3.0 mm, scanning accuracy was not significantly affected. If the inter-tooth distance was <2.0 mm or the axial wall height was >3.0 mm, scanning errors increased. Statistical analysis confirmed that both distance between abutments and axial wall height significantly impact scanning accuracy. For an enhanced accuracy of intraoral scans for tooth preparations, the minimum distance between the adjacent tooth and the prepared tooth should be at least 2.0 mm, and the height of the proximal axial wall of the prepared tooth should be <3.0 mm. These findings can help clinicians perform more precise intraoral scanning.
[References]
1) Kim MK, Son K, Yu BY, Lee KB. Effect of the volumetric dimensions of a complete arch on the accuracy of scanners. J Adv Prosthodont 2020; 12: 361-68.
This study aimed to investigate how the height of the proximal axial wall of a prepared tooth and the distance between the prepared tooth and adjacent teeth affect the scanning accuracy of intraoral scanners.
[Method]
Ten working casts with maxillary first molars prepared for zirconia crowns were used. Two different IOSs, i700 (MEDIT, South Korea) and CS3600 (Carestream Dental, USA), were used to scan each working cast 15 times 1). To compare the accuracy of the IOSs, a high-precision laboratory scanner (E1, 3Shape, Denmark) was used to obtain reference data. 3D analysis software (Geomagic Control X, 3D Systems, USA) was employed to align the scanned data with the reference model and to analyze root-mean-squared (RMS) deviations. Statistical analysis was performed using SPSS (IBM Corp., USA), including the Shapiro-Wilk normality test, independent t-test, one-way analysis of variance (ANOVA), Pearson correlation analysis, and multivariate analysis of variance (MANOVA) to assess the effects of different factors on scanning accuracy.
[Results and Discussion]
The i700 scanner demonstrated higher accuracy than the CS3600 in all cases. When the inter-tooth distance was ≥2.0 mm and the axial wall height was <3.0 mm, scanning accuracy was not significantly affected. If the inter-tooth distance was <2.0 mm or the axial wall height was >3.0 mm, scanning errors increased. Statistical analysis confirmed that both distance between abutments and axial wall height significantly impact scanning accuracy. For an enhanced accuracy of intraoral scans for tooth preparations, the minimum distance between the adjacent tooth and the prepared tooth should be at least 2.0 mm, and the height of the proximal axial wall of the prepared tooth should be <3.0 mm. These findings can help clinicians perform more precise intraoral scanning.
[References]
1) Kim MK, Son K, Yu BY, Lee KB. Effect of the volumetric dimensions of a complete arch on the accuracy of scanners. J Adv Prosthodont 2020; 12: 361-68.