Are there differences between comparison methods used to evaluate the accuracy and reliability of digital models?

Area of Science:

• Dentistry
• Orthodontics
• Digital Imaging

Background:

• Traditional plaster dental models are widely used but can be prone to inaccuracies and damage.
• Digital models offer potential advantages in accuracy, storage, and accessibility.
• Evaluating the reliability of different scanning technologies is crucial for clinical adoption.

Purpose of the Study:

• To assess the accuracy and reliability of digital dental models generated by two surface laser scanners (R700 and Xcad).
• To compare digital model accuracy against traditional plaster models using multiple measurement methods.

Main Methods:

• Thirty plaster models with permanent dentition were scanned using R700 and Xcad laser scanners.
• Measurements were taken on plaster and digital models using digital calipers and specialized software (Ortho Analyzer).
• Digital models were compared using superimposition software (Geomagic Qualify); intra- and inter-examiner reliability were assessed using ICC.

Main Results:

• High intra- and inter-examiner reliability (ICC values) were observed for measurements on both plaster and digital models.
• Statistically significant differences were found between plaster and digital model measurements, but these were not clinically relevant.
• Superimposition analysis showed no significant difference between the two digital models.

Conclusions:

• Digital models produced from scanned plaster models using R700 or Xcad scanners are clinically accurate.
• The evaluated laser scanning methods provide reliable digital dental models for orthodontic use.