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October 1999 Volume 12, Number 2

Continues..

Biaxial Flexural Strength and Indentation Fracture Toughness
of Three New Dental Core Ceramics

Wagner & Chu

The traditional gold and porcelain fused to metal crowns have been challenged by the esthetic all-ceramic crown materials. However, previous experience with poor mechanical properties, lack of standardized tooth preparation and processing challenges have prevented universal acceptance of all-ceramic crowns. However, stronger and tougher ceramics and unique processing methods for ceramics have been developed in the past 20 years.

In this study, three new ceramic crown core materials were tested to compare their biaxial flexural strength and indentation fracture toughness. Ten specimens of Empress, In-Ceram and Procera® AllCeram ceramics were prepared according to their manufacturers’ recommendations.
The results revealed significant differences in flexural strength for the three materials (p 0.05). The average flexural strengths of AllCeram, In-Ceram and Empress ceramics were 687 MPa, 352 MPa, and 134 MPa respectively. There was no statistically significant difference between the fracture toughness of Procera® (4.48 MPa • m1/2) and In-Ceram ceramics (4.49 MPa • m1/2); however, both ceramics had significantly higher fracture toughness (p<0.005) than Empress ceramic (1.74 MPa • m1/2).

J Prosthet Dent 1996(2)p.140-144.

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

Download Prosthodontic Insights Newsletter - October 1999 Vol. 12, No. 2

Scientific Articles and Ongoing Research

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