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Journal of Dental Research
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Stereometric Assessment of TMJ Space Variation by Occlusal Splints

D.A. Ettlin*, H. Mang, V. Colombo, S. Palla and L.M. Gallo

Clinic for Masticatory Disorders, Removable Prosthodontics and Special Care Dentistry, Center for Oral Medicine, Dental and Maxillo-Facial Surgery, University of Zürich, Switzerland, Plattenstrasse 11, CH-8032 Zürich, Switzerland


Figure 1
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  		Figure 1. Method of data acquisition and analysis. (A) Person biting on the monobloc with the reference system in place. (1) Box with the 3 reference spheres visible in the MRI system. (2) Reference target frame attached to the sagittal arm of the face bow. (B) Jaw tracking with the 3-mm splint inserted. (3) Maxillary target frame. (4) Mandibular target frame. (C) Global minimum condyle fossa-distance (hmin), defined as the mean of the 30 minimal distances between the polygon vertices approximating the condyle and fossa surfaces.

 

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  		Figure 2. Depiction of analysis parameters. (A) Representation of the condyle-fossa distance at point P0 (h0) with and without the occlusal splint. (B) Graphical representation of the parameters used to calculate rotation and translation. All drawings are schematic and exaggerated for clarification purposes.

 

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  		Figure 3. Changes in TMJ space due to splint insertion. (A) Example of the position of the global minimum joint space (hmin) in habitual closure without and with the occlusal splint. (B) Displacement vectors (in red) of h0 for all left and right joints studied. The shaded portion of the Fig. shows the average main condylar axes (in orange) and hemi-ellipses bordering the cranio-ventral quadrants of the condyles (in brown). The intracondylar distance is not to scale. All displacement vectors are located cranio-ventrally to the main condylar axes. Cc, caudocranial; dv, dorsoventral; rl, right-left.

 

Journal of Dental Research, Vol. 87, No. 9, 877-881 (2008)
DOI: 10.1177/154405910808700903
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