This PFM restoration failed due to a lack of support for ceramic at the marginal ridge. Note the fracture at the lingual margin due to possible flexure in that area.
Like metal, zirconia should be extended to the contact point of adjacent teeth to support the ceramic at the marginal ridges.
The porcelain is supported by the zirconia rod at the contact point where occlusal forces are the greatest.
Dennis Ouye, CDT addresses the importance of proper design and structural support.
Fractures in ceramic restorations have always been a challenge for technicians. Traditionally, they were caused by the lack of strength of feldspathic ceramic and...
Author
Dennis Ouye
. at . · Brentwood, CA
Dennis Ouye, CDT, is President of LDL Designs, Inc. in Berkeley, CA. He's held technician courses with Dr. Harry Albers at the University of California at San Francisco and University of the Pacific School of Dentistry, and has also taught ceramics at...
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