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[Quantitative evaluation for the accuracy of dental model three-dimensional scanner]
Yang Song1, Yu-chun Sun, Yi-jiao Zhao
1Peking University School, Beijing, China.
Objective:
To establish a method to evaluate dental model three-dimensional scanner quantitatively, and to evaluate the accuracy which is a core indicator of 3Shape D700 scanner.
Methods:
A standard geometric model similar to the dental arch was designed by three-dimensional reverse software and processed by high precision CNC (computer numerical control) processing technology. Core indicators of dental model three-dimensional scanner including single scanning accuracy, space consistency and rescan accuracy were evaluated.
Results:
The result of single scanning accuracy of 3Shape D700 scanner was (15.00±10.84) μm, and there was no statistics difference between the accuracy given by manufacturer's instructions which is 20 μm (P=0.053), and same as the results of space consistency (compare the accuracy in vertical direction and horizontal direction, P=0.524) and rescan accuracy (compare the rescan accuracy in vertical direction, P=0.633, and in horizontal direction P=0.221).
Conclusion:
It is feasible to evaluate accuracy of dental model three-dimensional scanner by this method, which can avoid observer error caused by selecting points manually.
