The Journal of Japanese Society of Stomatognathic Function
Online ISSN : 1883-986X
Print ISSN : 1340-9085
ISSN-L : 1340-9085
Quantitation of occlusal condition in the frame of reference on the cranio-facial system
Masaki SatoKatsunori ToriiMasahiro OkazaiHidenori SakuraiMitsuhiro TatsutaMasahiro TanakaTakayoshi Kawazoe
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1999 Volume 6 Issue 1 Pages 55-65

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Abstract

The purpose of this study was to develop a three-dimensional occlusal examination system and to observe the parameters of occlusal contact and mandibular displacement.
Two normal subjects and two patients with TMD whose chief complaints were noise in the joint participated in this study. Two silicone occlusal registrations were taken for each subject with different occlusal forces, under 5%MVC (Maximum Voluntary Clenching) and 30%MVC. The silicone occlusal registration was digitized by noncontact three-dimensional form measuring device (SURFLACER VMS-2508, UNISN Inc., Osaka, Japan) and the occlusal contact area of intraocclusal distance under 60μ m was calculated. The 3D-data were analyzed by CAD software (SURFACER, Imageware Inc., Michigan, USA) with a personal computer (Digital PC 5510 6300, DEC, Japan) . The inclination and size of occlusal contact area were computed and displayed as tooth vector and dentition vector. The cranio-facial bones were reconstructed from CT data and the frame of reference on the cranio-facial system was established. The maker-registration of 3D-data, the silicone occlusal registration and cranio-facial bones, were made using teflon balls. The markerless-registration of upper and lower dentition was made and the mandibular displacement during intercuspation was estimated from displacement of lower dentition.
The reproducibility was high and precision was under ±20μm of non-contact three-dimensional form measuring.
The mandibular displacement was small and the occlusal contact was equilibrated in normal subjects. The mandibular displacement was large and the occlusal contact was disequilibrated in patients with TMD.
The three-dimensional occlusal examination system was developed and occlusal contact and mandibular displacement were evaluated quantitatively and visually.

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