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Figure 1. Exerimental set-up and fundamentals for the muscle and joint force calculations. (A) Scheme of intra-oral force-measuring device used in the experiments: x', y', z' = coordinates of the occlusal plane; sg = strain gauge; bp = base plate; cp = contact plate; ms = metal splints bearing bp and cp. (B) Reference planes and their orientation to the location of force measurement: x, y, z = coordinates of the Frankfort horizontal plane; Jr, Jl = right and left joint reaction forces; Fres,maxilla = resultant force acting on the maxilla; Fres,mand = resultant force acting on the mandible; 
= circumferential angle; 
= cranial angle.
