A MODIFIED TECHNIQUE OF ORTHODONTIC MODEL TRIMMING

Abstract

Introduction: There are different tools in the diagnosis of an orthodontic case, the study models being one of them. They are helpful for three dimensional study of occlusion. Trimming the model is a very important task for an orthodontist. We have proposed certain modifications in the previously described techniques of model trimming. The purpose of this is to make the trimming easy, time saving, less laborious and more fruitful.

Materials and Methods: The bases are formed after removing the casts from the impression trays.

Conclusion And Result: We have suggested keeping the back width at least 8cm before trimming, the height from occlusal plane to floor at least 4cm and trimming the sides of upper and lower models at same angles. An elaborate method of adjusting the height of the casts is also suggested. The major bulk of trimming is done with both casts held in occlusion hence saving time. We have explained the fine details of every step necessary in model trimming making it a very uncomplicated and easily understandable procedure. We have also given model trimming procedure a systematic approach by providing a nomenclature for all the points, lines, angles and surfaces.