ПРЕПАРИРОВАНИЕ ЗУБОВ по герберту

BUCCAL REDUCTION – OCCLUSAL HALF (View 1)

Join the buccal depth slots in the occlusal half of the preparation.

BUCCAL REDUCTION – OCCLUSAL HALF (View 2)

Join the buccal depth slots in the occlusal half of the preparation.

BUCCAL REDUCTION – OCCLUSAL HALF (View 3)

Join the buccal depth slots in the occlusal half of the preparation.

BUCCAL REDUCTION / SHOULDER CREATION.

Using 501 join the marginal depth slots and create a shoulder that:

-Is 1.0mm in depth.

-Is supra-gingival, even if the finished shoulder is to be sub-gingival

-Has a rounded internal line angle.

-Follows the contour of the gingivae buccally

Keep the long axis of the bur parallel to the buccal surface, in the same way as the depth slots.

EXTEND SHOULDER INTERPROXIMALLY

Extend the shoulder interproximally until it is out of sight buccally when looking along the line of This creates the so-called ‘wings’ which conserve tooth tissue and mark the point at which porcel will terminate.

NB: These are not slots/grooves.

CLEAR CONTACTS

Use 582 needle point diamond to cut through the marginal ridge inside the contact point. Great c needed to prevent damage to the adjacent teeth.

Cut through the tooth so that a strip of proximal enamel protects the adjacent tooth from bur con attempt to take the bur between the teeth.

The aim of this part of the preparation is simply to separate the teeth.

PLANE PROXIMAL SURFACES.

Once the contacts are clear, use the needle point diamond to plane the proximal surfaces until th sufficient access for your torpedo diamond, without contacting the adjacent teeth.

Clinical note: your technician is going to have to saw the model between your prep and the adjac you don’t leave enough room, your margin and/or the proximal surface of the adjacent tooth may

15.PALATAL CHAMFER.

Using your 877 Torpedo diamond prepare the palatal axial surface to create the correct converge to the cervical half of the buccal axial preparation.

INTERPROXIMAL CHAMFER.

Use the torpedo diamond to join the palatal chamfer and the buccal shoulder.

-Keep the margin supra gingival.

-Monitor the bur angulation to create the correct taper between proximal axial walls.

BLEND PALATAL AND INTERPROXIMAL CHAMFERS

Round any line angle between palatal and proximal axial preparations to ensure alloy will have th contour and a natural emergence profile. Do not over-round your preparation.