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A critical comparison of three methods for measuring dental models
P E Rossouw1, M Benatar, I Stander
1Department of Orthodontics, University of Stellenbosch, Tygerberg, South Africa.
The Journal of the Dental Association of South Africa = Die Tydskrif Van Die Tandheelkundige Vereniging Van Suid-Afrika
|April 1, 1991
Summary
This study compared three methods for measuring orthodontic plaster casts. Holographic imaging offers an accurate and space-saving alternative to traditional plaster cast measurements.
Area of Science:
- Orthodontics
- Biomedical Engineering
- Metrology
Background:
- Orthodontic plaster casts are essential for diagnosis and treatment planning.
- Storage of numerous plaster casts presents significant challenges.
- Accurate measurement of fiducial points on casts is crucial for analysis.
Purpose of the Study:
- To compare the accuracy of three distinct measurement techniques for orthodontic plaster casts.
- To evaluate the feasibility of using holographic imaging for orthodontic record-keeping.
- To determine if holographic measurements correlate significantly with direct and digital measurements.
Main Methods:
- Direct measurement of distances between fiducial points using a vernier caliper (Dv).
- Digital measurement using a reflex metrograph to record coordinates and calculate distances (Dm).
- Holographic imaging of casts, followed by distance measurement on holographic images using a reflex metrograph (Dh).
Main Results:
- Statistical analysis (Wilcoxon sign rank test) showed no significant differences between the three measurement methods (p > 0.1).
- Mean differences between methods were minimal: Dv-Dh (<0.5 mm), Dv-Dm (0.5 mm), and Dm-Dh (0.2 mm).
- Holographic measurements demonstrated high concordance with both direct and digital caliper measurements.
Conclusions:
- Holographic imaging provides a sufficiently accurate method for representing orthodontic study models.
- Holograms offer a viable solution for the long-term storage of orthodontic records, mitigating space issues.
- This technique could revolutionize orthodontic case record management and archival processes.