Crown And Bridge Impression

Teeth are prepared for bridge

Notice the shape of the preps. Room must be left to accommodate the restoration.

Hemostatic solution is utilize to control bleeding

Cords are soaked in the solution before placement. Some cords are already impregnated with hemostatic solution eliminating this step.

Plain

Braided

Cord is “packed” inserted into the sulcus of the prepared teeth

The cord displaces the gingiva for the light body impression material can easily flow into the sulcus. The cord comes in diameter sizes 000 thru 3. Sometimes 2 cords are need in this step.

The final impression is taken by the dentist.

In this example a triple tray is used

Intraoral and mixing tip

Light body cartridge and mixing gun

Heavy body Putty

Triple tray with tray adhesive

If a triple tray is not used, three separate procedures must be performed:

• Take an impression of the prepared teeth

• Take an impression of the opposing arch

• Take a bite registration

Light body impression material applied to the prepared to teeth to capture detail.

This material is less viscous and “wets the surfaces of the preps better.

Heavy body material is placed in the tray and then placed over the light body material to form the impression

The heavy material provides stability to the impression for better accuracy.

The patient bites into the impression material until set. Approx. 4-5 min.

Notice the impression material did not cover the dentition on the Mx arch. This impression may have to be retaken or and additional impression of the opposing arch will be needed.

Both the light and heavy body material come together to form a unified impression

Notice the sharp detail of the margin in this impression vs. the impression below.

If the detail is not accurate the impression may be reused to capture the detail. This is know as a “Wash”

After disinfection, the impression is sent to the lab with the RX.

A temporary is made of acrylic or resin material

Crowns can be made of acrylic, resin or preformed shells

Removing cement

Popular temporary cement

Temporary bridge cemented into place until “permanent” bridge is completed in the lab to maintain occlusion

Bridge on a laboratory cast

Digital impressions replacing impression materials