ПРЕПАРИРОВАНИЕ ЗУБОВ по герберту

SHOULDER FINISHING (View 1)

The position for the buccal margin should be planned in advance. Keep the margin supragingival.

Preparation with 501 diamond will produce a rounded internal line angle that will reduce stress co when fabricating, cementing and using the crown.

The 501 will also create a rounded lip towards the outside of the shoulder, this must now be care flattened with a flat-tipped bur eg: 847 tapered diamond (Tip diameter 1.01mm) and/or a sharp trimmer.

SHOULDER FINISHING (View 2)

... using the chisel

CHECK AXIAL TAPER

Dry and carefully view your preparation from all angles and check the following: No undercuts. 10-20° convergence angle.

The whole margin and all internal angles are visible, when viewed from one position above. Smooth any sharp line angle where the buccal axial planes meet, to reveal any part of the should when viewed from above.

SMOOTH PREPARATION

Using composite finishing burs, fine discs or rubber cups + pumice, gently smooth line and point

FINISH.

FINISH.

!