In vitro testing of the accuracy of a computerized pantograph

Abstract

Statement of the problem. The accuracy of a computerized pantograph has not been confirmed in laboratory or clinical studies.Specific aims. The purpose of this in vitro study is to test the accuracy of a computerized pantograph to record predetermined condylar settings on a fully adjustable articulator for condylar inclination with flat versus 3/8" inserts, top wall, rear wall, progressive side shift, and immediate side shift. Materials and methods. Computerized pantographic sensors were mounted on a fully adjustable articulator with an arbitrary determination of the hinge axis. Tracings were made on the articulator with known condylar settings for condylar inclination with flat and 3/8" curved inserts, immediate side shift, progressive side shift, top wall and rear wall. Means, standard deviations, P-values, equivalence testing and Bonferonni adjustments were determined for each condylar setting.Results. The computerized pantograph accurately recorded the immediate side shift at 0, 1.2 mm and 2.0 mm (P<.0001). Condylar inclination with the 3/8" curved insert at 10 and 25 degrees was accurately determined at the 10 mm condylotrack distance (P<.0001). Condylar inclination with the flat insert, progressive side shift, top wall and rear wall were non-significant.Conclusion. The computerized pantograph is a valid instrument for recording immediate side shift and condylar inclination with a curved 3/8" fossa at the 10 mm condylotrack distance.