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Accuracy in Dental Medicine, A New Way to Measure Trueness and Precision

Accuracy in Dental Medicine, A New Way to Measure Trueness and Precision

Published on: April 29, 2014

A comparison of plaster, digital and reconstructed study model accuracy.

Andrew P Keating¹, Jeremy Knox, Richard Bibb

¹Regional Orthodontic Unit, Waterford Regional Hospital, Waterford, Ireland.

Journal of Orthodontics

|September 24, 2008

Summary

The Minolta VIVID 900 laser scanner accurately captures 3D digital surface details of plaster dental models. However, rapid prototyping cannot reliably reproduce accurate physical replicas from these digital scans.

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Area of Science:

Biomedical Engineering
Dental Technology
Orthodontics

Background:

Accurate 3D digital recording of dental study models is crucial for orthodontic diagnosis and treatment planning.
Traditional methods of model replication can be time-consuming and prone to inaccuracies.
Advancements in 3D optical laser-scanning technology offer potential for improved digital data acquisition.

Purpose of the Study:

To assess the accuracy and reproducibility of the Minolta VIVID 900 3D optical laser-scanning device for capturing plaster dental model surface details.
To evaluate the accuracy of physical replicas created from 3D digital files using a rapid prototyping (RP) process.

Main Methods:

A method comparison study involving 30 dental study models.
Three-dimensional scanning of each model using the Minolta VIVID 900 laser scanner and Easy3DScan software.

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Recording linear measurements between landmarks on plaster models and their 3D digital counterparts on two separate occasions.

Evaluating dimensional accuracy of physical replicas produced from digital files via RP.

Main Results:

The mean difference between measurements on plaster models and 3D digital models was 0.14 mm, which was not statistically significant (P = 0.237).
A highly statistically significant difference (P <0.001) was found in measurements between plaster/virtual models and RP models in the z-plane.
The Minolta VIVID 900 demonstrated reliability in capturing 3D digital surface detail.

Conclusions:

The Minolta VIVID 900 is a reliable device for creating accurate 3D digital representations of plaster dental study models.
The rapid prototyping technique evaluated is not suitable for reproducing physical models with appropriate detail and dimensional accuracy from scanned data.