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The abutment teeth preparation with jacket crown for the maxillary right central incisor was prepared in Home Position. The following are the result of a study made on the influence to the prepared tooth form. The operators were five dentists who had 2-4 years clinical experiences and were made to prepare with 1.0 mm width shoulder. 1. The reduction of incisal edge was like the indication. 2. As for the subgingival reductions, the proximal surfaces were deep and the facial and lingual surfaces were shallow. 3. As for the degree of axial taper, angles of convergence were comparatively like the indication, and prepared teeth were inclined to distal direction for imaginary axis of tooth crown before operation. 4. The width of shoulder were insufficient except at the facial surface. 5. The surface roughness on axial wall was almost acceptable, but the roughness on shoulder was sufficient at facial surface, while insufficient at others. 6. As for Rough Value, smoothness of curve on finishing line was questionable. 7. Tooth preparation of maxillary anterior teeth in Home Position, compared with posterior, is fairly easy to operate under mirror view, and the method is stable and available.

The influence of the home position operator's posture on the prepared abutment contour of jacket crown. The maxillar right central incisor.