October 1999 Volume 12, Number 2

Continues..

Research Evaluations of a New All-Ceramic System

Razzoog and Lang

The demand of patients and the profession for crown restorations with a more natural appearance and the challenge of creating a restoration that defies detection and is consistently excellent, have resulted in the development of a new all-ceramic system (Procera® AllCeram, Nobel Biocare, AB, Göteborg, Sweden). The new restorative concept combines manufacturing techniques for fabricating an aluminum oxide coping with the specific porcelain veneering expertise of the dental ceramist in order to create a strong, esthetically pleasing restoration.

This article presents the results of clinically relevant research projects that have led to the routine application of this all ceramic system. The results are as follows:

Strength of the crown: Analysis of the study data concluded that differences in the coping thickness of 0.5 mm and 0.7 mm produced no significant differences in the fracture resistance of the crowns tested.

Color stability: No clinically detectable color change was measured for the Procera® AllCeram porcelain at the conclusion of a 1200-hour accelerated aging procedure.

Masking properties: Use of an opaque material to mask an underlying stain, discoloration from a post and core, or amalgam buildup of the preparation was found to be unnecessary.

Wear characteristics: The Procera® Porcelain AllCeram occlusal surface does not wear the opposing natural dentition.

Precision fit: A treatment plan can be established with confidence, as the marginal opening of a Procera® AllCeram crown will consistently be less than 70 um.

Cementation Procedures for the Crown: The results of a study on the effect of different cements on the fracture resistance of the Procera® AllCeram crown indicate that Procera® AllCeram crowns can be used successfully as restorations in all areas of the mouth.

The application of Procera® AllCeram is presently restricted to single crown restorations. However, with the continued development, multiple unit, all-ceramic anterior and posterior fixed partial dentures may be future indications. During the past several years, the Procera® AllCeram System has demonstrated favorable characteristics throughout several clinical evaluations. By combining CAD/CAM technology with densely sintered, high-purity copings, the Procera® System enables the fabrication of restorations which are durable, color-stable, and biocompatible with opposing dentition.

PPAD Supplement No. 4. June/July 1998

October 1999 Newsletter

Procera Article
Research Evaluations
Precision of Fit
Flexure Test
5-Year Clinical Follow-Up
Investigation of Enamel Wear
Biaxial Flextural Strength
Use of Procera CAD/CAM System

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