The Branemark System CeraOne Abutment

The Cera One Abutment and gold abutment screw is designed to accept a cement able ceramic core restoration. The ceramic cap is made from densely sintered aluminum oxide (99.7% Al2 03). With no metal core, the esthetic capabilities are increased. The short cap measures 5.8 mm in height with a .7 mm thickness. The tapered long ceramic cap is useful in anterior applications.

The components and hardware for this system include from left and top to bottom: impression coping, abutment replica and healing cap, gold abutment screw, abutment, titanium fixture, cut down coping, aluminum oxide ceramic core, aluminum oxide ceramic core for anterior.

The abutments come in five heights: 1 mm; 2 mm; 3 mm; 4 mm; 5 mm. The Nobelpharma Torque Controller, TM shown previously in Figure 6-53, has a setting to screw the gold abutment screw with a force of 32 N em.

The abutment and gold screw are placed intraorally.

A radiograph verifies the accurate placement of the abutment.

The plastic impression coping is placed intra orally with a friction fit.

A conventional impression is taken and the impression coping is incorporated. It is recommended that a heavy-bodied impression material be used.

The plastic yellow abutment replica is carefully placed into the female portion of the impression copmg

Soft tissue material is placed around the gingival area of the crown prototype. The model is then poured in improved die stone. A ceramic cap is placed onto the abutment replica, and the restoration is now ready for buildup.

Porcelain is applied according to the special instructions, removed from the master cast, and final contours added as needed. The porcelain must be of a type intended for all-porcelain crowns.

The porcelain should be worked on wet and never allowed to dry out, to avoid porosity. A relatively slow firing cycle should be used. Prolonged firing under vacuum should be avoided.

The vacuum must be broken when the aluminum oxide-reinforced porcelain reaches the recommended firing temperature. After this has been achieved, the aluminum oxide crown can be fired at atmospheric pressure.

1. Firing scheme for the core material

• Starting temperature of the oven: 600° C.
• Preheating time: more than 4 min.
• Temperature rise: 55° C/min, 600-1070° C under vacuum; 55° C/min, 1070-1110° C under atmospheric pressure.
• Firing: 2 min at 1110° C under atmospheric pressure.

2. Firing scheme for dentin material

• Starting temperature of the oven: 600° C.
• Preheating time: more than 4 min.
• Temperature rise: 55° C/min, 600-960° C under vacuum.
• Firing: under atmospheric pressure 1 min at 960° C.

3. Glazing

• Starting temperature of the oven: 600° C. Preheating time: 4 min.
• Temperature rise: 80° Clmin, 600-920° C. Firing: 1 min.

Use a diamond tool if it is necessary to grind the porcelain caps. The caps should be washed in a solution of diluted hydrofloric acid for five minutes, then steam cleaned or cleansed in an ultrasonic bath. The porcelain caps should be dried in air before firing.

The finished crown on abutment replicas.

The finished crown cemented to place. Note the superior vitality and translucency that can be attained when the metal core is eliminated.

Components for the Branemark System hex lock gold cylinder are as follows from the top: gold cylinder, square impression coping, tapered impression coping and brass replica.

Bdlnemark System hex lock gold cylinders are supported by a special hexagonal titanium abutment and abutment screw. This cylinder is secured by a small gold screw, thus preserving the original design feature of the weak link being the prosthetic gold screw. A regular laboratory guide pin is used for fabrication techniques.