Development of the computerized dental cast form analyzing system--three dimensional diagnosis of dental arch form and the investigation of measuring condition

Dental Materials Journal
K WakabayashiT Maruyama

Abstract

To analyze the functional and morphological harmonies of the tooth and dental arch, a computerized system to measure a dental cast and to detect the apex of dental cusps and angle points of incisors was developed. Detailed morphology in the measured dental cast could be displayed distinctively by computer graphics (CG) with a surface model. Accuracy in determining the position of the apex of the dental cusp was examined by increasing the measuring pitch from 50 microns to 400 microns, the error increased gradually with increased measuring pitch. Taking the measuring error, the time for measurement and the memory size for analysis into account, a measuring pitch of 200 microns was determined to be reasonable. Three-dimensional data measurements from the apex of the dental cusp in molar, and the mesial and distal angles in canine and incisor were fitted to a polynomial formula. In the present measured model, the 4th order polynomial formula was used for the dental arch, and the 2nd order polynomial formula was used for the anteroposterior and lateral occlusal curves. These formulae could be simultaneously superimposed on the surface model of the dental cast, and displayed using CG.

Citations

Mar 6, 2015·Dental press journal of orthodontics·Mahtab NouriReza Massudi
Mar 11, 2004·Journal of Oral Rehabilitation·M NishidaJ Takahashi
Dec 3, 2003·Australian Dental Journal·L J Walsh
Aug 23, 2020·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·Luca LepidiJunying Li
Aug 19, 2007·Dental Materials Journal·Mamoru MurakamiEiichi Nagaoka
Nov 17, 2020·Clinical, Cosmetic and Investigational Dentistry·Dashrath KafleRajeev Kumar Mishra
Sep 12, 2002·Dental Clinics of North America·Bernd KordassStefan Seipel

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