How to Prevent Fractures in Zirconia-Based Restorations

Dennis Ouye, CDT · Technical · Sep 2009

  • 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.