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A new method for the computer-aided evaluation of three-dimensional changes in gypsum materials
Ralph G Luthardt1, Peter Kühmstedt, Michael H Walter
1Department of Prosthetic Dentistry, Dental School, University Hospital Carl Gustav Carus, Dresden University of Technology, Fetscherstrasse 74, 01307, Dresden, Germany. ralph.luthardt@mailbox.tu-dresden.de
Summary
A new method reliably assesses the 3D stability of dental stone dies over 56 days. Dental cast dimensional accuracy remained stable and clinically insignificant throughout the study period.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Digital Dentistry
Background:
- Evaluating the long-term dimensional stability of dental materials is crucial for prosthodontic success.
- Existing methods for assessing three-dimensional (3D) stability can be complex and time-consuming.
- A reliable and quantitative method is needed to evaluate the time-dependent stability of dental casts.
Purpose of the Study:
- To test the reliability of a newly developed investigation procedure for quantitative 3D stability evaluation.
- To assess the 3D stability of resin-reinforced gypsum master casts over a 56-day period using the developed procedure.
Main Methods:
- Ten duplicate dental stone dies were created from a metal master die.
- Dies were digitized at multiple time points (1, 3, 7, 28, 56 days) using a 3D optical measuring device.
- Digitized data were compared to the master die's CAD-surface model to determine 3D accuracy.
Main Results:
- The developed procedure demonstrated high precision, with mean deviations below 3 micrometers.
- No significant changes in the three-dimensional dimensional stability of the dental stone dies were observed over the 56-day examination period.
- Best-fit registration proved effective for aligning point cloud data to the CAD-surface model.
Conclusions:
- The quantitative 3D evaluation procedure is reliable and suitable for assessing dental material stability.
- The dimensional stability of resin-reinforced gypsum master casts is insignificant and clinically irrelevant over a 6-week period.
- This method provides a valuable tool for ensuring the accuracy and longevity of dental restorations.