Jvd 2007 (#1)

Front 1

What are the goals for full metal crown restoration?

Back 1

1. Protect the remaining tooth structure
2. Restore occlusal fxn
3. Maintain a healthy preiodontium

Front 2

Ideally the final restoration should have the same dimensions as the original intact tooth

Back 2

In vet dentistry, full metal crowns are indicated for fractured, non-vital teeth after endodontic therapy, as well as protection of diseased or weakened vital teeth

Front 3

Covering the occlusal surface with a cast metal restoration distributes occlusal forces and improves the long-term prognosis of endodontically treated teeth

Back 3

Studies have shown that full crowns exhibit superior retention and resistance when compared to partial crown designs

Front 4

In this case a medium grit round diamond bur (size 016) was used for margin prep and a medium grit taper diamond bur was used for crown reduction to the level of hte cut margin

Back 4

The size 016 round bur had a diameter of ~1.6mm

Front 5

The preparation should cut into the enamel a depth of 0.5-1mm

Back 5

The round bur will create a chamfer type margin--which is the preferred margin prep for metal crowns

Front 6

The prep should have a smooth finish

Back 6

Should be able to see from all angles the tooth (birds eye view) with no undercuts, etc

Front 7

For the maxillary 4th PM--the palatal axial wall should be reduced to prevent occlusal interference with the opposing mandibular 1st molar tooth

Back 7

Also for maxillary 4th PM--make sure that any contact b/w the interproximal region of P4-M1 is eliminated to allow for accurate impressions of the margin.
The cusp over the palatal root should be reduced to nearly flat

Front 8

In order to maximize retention--a pyramid shaped preparation should be avoided!

Back 8

The final preparation should be smooth and any remaining sharp edges should be rounded or beveled

Front 9

The impression should:

Back 9

record the exact dimensions of the preparation, the architecture of the margins, and the relationship of the prepared tooth to the surrounding dentition

Front 10

The 2-step putty/wash technique using vinyl-poly siloxane (VPS) impression material will provide a detailed impression of the prepartion for fabrication of the metal crown

Back 10

An alginate impression for the opposing arch can be taken to provide a low detail model used for checking occlusion.
* I do alginate impressions of MX an MN*

Front 11

The VPS tray is placed in mouth and wiggled before the putty sets to create an enlarged empression and to allow for the light-bodied wash

Back 11

Light-bodied wash is placed around the tooth and surrounding teeth that was prepped. Make sure to blow in (using air syringe) or digitally manipulate to get the light-body into the sulcus

Front 12

Keep the impression tray seated with passive pressure until the VPS has set (~5 min). Excessive pressure will cause an inaccurate impression

Back 12

Inspect the impression for accuracy and make sure the entire margin is recorded with no bubbles or defects

Front 13

A bite registration is made with medium pink dental wax or a bite registration wash when the pet is extubated

Back 13

The underlying putty should not be visible through the final impression

Front 14

Resin based cement is generally advised for animals since it provides a stronger bond than other cements

Back 14

True