The “Prosthetic Orthodontic Approach”: An Application of the Biologically Oriented Preparation Technique Protocol

Figure 4

Mesialisation of the abutment tooth using the biologically oriented preparation technique (BOPT): (a) tooth; (b) the tooth is prepared without a finish line (BOPT), more on the distal than on the mesial side: this allows the mesialisation of the crown axis; (c) the tooth is prepared with a horizontal finish line, such that the crown restoration is in continuity with the external profile of the root. Therefore, the crown axis cannot be moved without altering the tooth proportions, even if the distal side is prepared more than the mesial side.

(a)

(b)

(c)