Patent Document ID: 4411626
Application ID: 06223685
Patent Flag: 1

Claim One:
1. In a process for preparing a dental crown portion to be secured to a tooth stump in which a model is made of the tooth stump, molding material is applied to the model and has its outer contour formed by removal of material, said molding material being thereafter removed from the model and used as a casting model for the dental crown portion, the steps of: scanning with a scanning head for conversion into geometrical data at least part of the contour of the tooth stump; supplying the geometrical data to a computer memory coupled to the scanning head; calculating, from the geometrical data, the contour for the casting model, taking into account an allowance for material on the outer surface of the tooth stump and storing said data in the computer memory; and, guiding, according to the calculated contour for the casting model, a contour tool coupled to the computer memory along the molding material that has been applied to the model of the tooth stump whereby a casting model for a dental crown portion is formed.