Effect of Arch Form on Accuracy of Intraoral Scanners
Abstract
Introduction: Intraoral digital impressions have prevalent use in modern dental treatment workflows. Usage of this technology has expanded into orthodontic and multiple unit or full arch procedures. Research concerning the accuracy of individual systems on a limited span of teeth has been established, however little research is present comparing what impact, if any, arch form has on accuracy. To date, no study has been published examining how dental arch form affects digital impression accuracy. Objectives: The aim of this study was to assess the accuracy (trueness and precision) of full arch digital impressions, comparing different arch forms, using the CEREC Omni-cam with CEREC Ortho module and the 3Shape Trios intraoral scanner. Materials and Methods: Five casts of a standardized dental arch were made with varying arch form shapes(tapered, ovoid-tapered, ovoid, square-ovoid, and square). The casts were digitally scanned ten times each, using two intraoral scanners (CEREC Omnicam with Ortho SW and 3Shape Trios) for a total of one hundred test scans. The casts were also reference scanned three times each with a desktop laboratory scanner (Degree of Freedom HD scanner). Test and reference scans were aligned using best fit analysis. The null hypothesis was that different arch forms have no effect on trueness or precision of scans for either intraoral scanner tested. Results: For unsigned trueness, a linear relationship as a function of cast narrowness was present (p<0.0001). Narrow and ovoid arch forms scanned with more trueness than square forms. For signed trueness, there was a similar linear trend for cast narrowness (p=0.006). For unsigned precision, the ovoid arch scanned most precisely. Narrow and square forms showed the least precision (p<0.0001). For all values, the 3Shape Trios was outperformed in accuracy by the CEREC Omnicam with Ortho SW. Conclusions: Within the limitations of the present study, arch form impacted intraoral scanner accuracy.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 2020
- Accession Number
- AD1182685
Entities
People
- Diewitt Duong
Organizations
- Uniformed Services University of the Health Sciences