Posterior Slot Preparations

How to establish an outline?

Move bucal and lingual

Why should a fender wedge not be used until proximal tooth structure is broken?

cannot adequately visualize buccal lingual dimensions

What burr used to prepare a posterior slot prep?

round bur

pear shaped burr

What is required for posterior slot preparations?

Beveled cavosurface margin

What can be used to place bevels?

rotary instruments = carbide or diamond burrs

hatchet/chisel

What angle is needed when placing a bevel?

45 degree angle

Where should retention features be placed?

0.5 mm into dentin

True/False: gingival floor should be beveled in posterior slot preparations

false

What should be checked prior to beginning a restoration?

occlusion

Alternate wedging technique

place wedge and restore one tooth at a time

Separating ring and a sectional matrix

When to use a posterior slot preparation

when decay does not go across the transverse ridge

Why is a posterior slot preparation used?

To preserve the isthmus / tooth structure when there is no decay across the transverse ridge

What is the difference between a short lock prep and a slot preparation?

occlusal dovetail added in a short lock prep

Where are completed locks placed?

proximal wall and axial wall

Why do slot preparations fail?

lack of retention

What is the shape of a slot preparation?

slight V shape

How are the buccal and lingual walls of a slot preparation created?

slightly diverging = slight V shape

What is a dovetail used for?

secondary retention

True / False: saucer shaped preparations and restorations tend to fail

true

On what tooth does a slot prep fail most often?

mandibular molar