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This study established a new method of quantitive analysis on the form of abutment teeth prepared with natural teeth at Random Position (R. P.) under clinical situation.The subjects for this study which were the maxillary first premolars on the right and left side andthe cases of indication of extruction conveniently under orthodontic treatment were evaluated.The preparations were the chamfer type for full cast crowns on the right side and the full-shoulder type for full-bake type porcelain fused to metal crowns on the left side.Further, those data were compared with the average data of ten abutment teeth prepared withmelamine-resin teeth on a mannequin by the same operator at R.P. to evaluate this new method ofanalysis.Those data could be compared under the same standard and the form of abutment teeth preparedwith natural teeth were similar to that with melamine-resin teeth. On the side, some factors whichwere considered to influence the teeth preparation were apparent.As a result, this new method could be used for analysis of the form of abutment teeth preparedwith natural teeth.

A Study on the Tooth Preparation for Full Coverage Crown. Part 1. Evaluation of the Form of Abutment Teeth Prepared under Clinical Situation.