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Updated: Nov 19, 2025
Accuracy in Dental Medicine, A New Way to Measure Trueness and Precision
Published on: April 29, 2014
Dental measurements based on a three-dimensional digital technique: A comparative study on reliability and validity.
Jialin Liu1, Yanshi Liu2, Jian Wang3
1Department of Prosthodontics, The First Affiliated Hospital of Xinjiang Medical University, Urumqi 830054, Xin Jiang Uygur Autonomous Region, China; Affiliated Stomatological Hospital of Xinjiang Medical University, Urumqi 830054, Xin Jiang Uygur Autonomous Region, China; Stomatology Research Institute of Xinjiang Uygur Autonomous Region. Urumqi 830054, Xin Jiang Uygur Autonomous Region, China.
Three-dimensional (3D) scanning offers a reliable and valid method for dental measurements, comparable to traditional techniques. This technology is suitable for clinical use in dentistry, enhancing diagnostic accuracy.
Area of Science:
- Dental Technology
- Digital Dentistry
- Oral Health Research
Background:
- Accurate dental measurements are crucial for orthodontics and prosthodontics.
- Traditional methods involve physical models and manual measurements.
- Digital technologies offer potential advancements in dental metrology.
Purpose of the Study:
- To assess the reliability and validity of 3D digital models for dental measurements.
- To compare 3D scanning measurements with traditional caliper measurements of plaster models.
- To evaluate the clinical applicability of 3D scanning in dentistry.
Main Methods:
- Measured mesiodistal diameter, buccolingual diameter, and clinical crown height on 2800 teeth from 100 dental models.
- Utilized both traditional plaster models and 3D digital models generated by structured light scanning.
- Assessed intra- and inter-observer reliability using Intraclass Correlation Coefficient (ICC) and validity via Bland-Altman analysis.
Main Results:
- High intra- and inter-observer reliability (ICC > 0.75) for both traditional and 3D methods.
- Bland-Altman analysis indicated mean biases close to zero, with 95% limits of agreement within 0.5 mm.
- Mesiodistal diameter showed the largest variation, while clinical crown height had the smallest.
Conclusions:
- 3D digital measurements are consistent with conventional methods.
- The 3D scanning technique demonstrates clinical acceptance and suitability for dental metrology.
- This technology presents a promising tool for accurate dental diagnostics and treatment planning.
