S-Space College of Dentistry/School of Dentistry (치과대학/치의학대학원) Dept. of Dentistry (치의학과) Journal Papers (저널논문_치의학과)
3차원 가상 치과모형 계측 값의 정확성 유효 검정
An Evaluation of Validity of Measurements using Digital Caliper and Three-dimensional Virtual Dental Models
- 이주훈; 백기석; 장미숙; 이승표
- Issue Date
- The Korean J. Anat. 37(2), 209-218, 2004
- The measurement of tooth and the space analysis of dental study models are essential for precise diagnosis and
treatment plan for orthodontic or prosthodontic cases. Traditionally, these have been done on study models with instruments,
such as a divider or a caliper. At present, three-dimensional (3-D) virtual dental models are available for clinicians,
supplemented by dedicated software for performing needed measurements on them. For example, Autoscan
system for dental applicationTM (ASDA; INUS technology INC, Korea) is one of these systems using a non-contact 3-
D scanner. The accuracy of this system has been tested and validated by the Korea Testing Laboratory. However, the
outline of dental models is not simple and has many undercuts. Therefore, we sought to evaluate the accuracy of measuring
models using digital calipers or ASDA to compare these two techniques.
From each ten study models, 10 duplicated stone and 10 virtual models were generated. Virtual models were scanned
from duplicated model because of revival of clinical situation. Then, central incisors, canines, first molars, arch (intercanine
and intermolar) width of original model were measured by a digital caliper, and the same items of virtual models
were measured by software. All measurements were performed twice by two experienced observers. Data were statistically
analyzed by 2-way Analysis of Variance (2-way ANOVA, SPSS Ver. 11.5).
The results from this study have demonstrated that virtual model is highly valid and reliable for measuring both tooth
size and arch width. Although some values of virtual model are higher or lower than original dental model, the significance
value is still higher than 0.97.
A digital caliper seems to be a more precise instrument to perform a scientific work, ASDAs accuracy is clinically
acceptable. Furthermore, considering its present advantages and future possible applications, the examined or equivalent
3-D virtual models may become the standard for clinical use.