In the literature it was reported that mean total occlusal convergence angles ranged from 12.2 to 27 degrees, far away from the recomended 4 to 8 degrees. The result of the high taper angles is nonsatisfactory resistance form in 22.5% of cases. OBJECTIVES: The purpose of the study was to evaluate and improve tooth preparation for fixed partial dentures with and without parallelometer in groups of 3 students on 3rd, 4th and 5th year. METHODS: On the basis of clinical cases models of the upper jaw were made from acrylic resin. Students initially prepared the model with 7 tooth in a phantom conventionally using freehand preparation and than with a parallelometer (Axisgraph, Eronomic dental instruments. LLC). Impression were taken with two stage impression technique with adition silicone. The areas of preparing tooth were slice in the anterio-posterior plane. Next, angles were measured. RESULTS: The avarage angle in freehand preparation was 20 degrees for student of the 5th year, 27 degree for student of the 4th year and 23 degree for student of the 3rd year. In preparation with the parallelometer the results were 14 degrees for all students. A preparation times with parallelometer were 30 – 40% less than preparation without parallelometer. CONCLUSION: Preparation with the parallelometer significantly improve the preparation form and saving a preparation time.This method is a simple for using in students education.

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Back to the 81st General Session of the International Association for Dental Research (June 25-28, 2003)

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