INVESTIGATION OF THE EFFECTS OF A VARIABLE LATERAL GUIDANCE INCLINE ON THE PANTRONIC REGISTRATION OF MANDIBULAR BORDER MOVEMENT .2.

This study was designed to test the hypothesis that changes in lateral guidance inclination could affect the condylar registrations in the r ecordings of an electronic pantograph. In seven healthy subjects, pant ronic registrations of immediate side shift, progressive side shift, a nd orbiting and protrusive condylar paths were recorded with lateral a nterior guidance inclinations of 0, 20, 30, 45, and 60 degrees from th e same pin height. Analysis of variance with repeated measures showed a significant decrease in the immediate side shift (p 0.016) and the p rogressive side shift (p 0.051) as the lateral guidance angle increase d and no significant effect on the orbiting registrations. These obser vations, together with those from other studies, suggest that the conc ept of fabricating the working-side tooth guidance exactly according t o instrument condylar settings (which themselves may be subject to a v ariable recording lateral anterior guidance) appears untenable and dem ands further study.