Investigation of the effects of a variable lateral guidance incline on the pantronic registration of mandibular border movement: Part II.

This study was designed to test the hypothesis that changes in lateral guidance inclination could affect the condylar registrations in the recordings of an electronic pantography. In seven healthy subjects, pantronic registrations of immediate side shift, progressive side shift, and orbiting and protrusive condylar paths were recorded with lateral anterior guidance inclinations of 0, 20, 30, 45, and 60 degrees from the same pin height. Analysis of variance with repeated measures showed a significant decrease in the immediate side shift (p 0.016) and the progressive side shift (p 0.051) as the lateral guidance angle increased and no significant effect on the orbiting registrations. These observations, together with those from other studies, suggest that the concept of fabricating the working-side tooth guidance exactly according to instrument condylar settings (which themselves may be subject to a variable recording lateral anterior guidance) appears untenable and demands further study.

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