Frameworks fabricated by Nick Hayden, Owner of Partial Foundations Dental Lab.
- April 2011
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 insufficient bonding to the tooth.
While newer, stronger ceramics and improved bonding agents help prevent fractures, it's still important to remember that proper substructure design that provides adequate porcelain support is crucial to the success of a case, and this is as true for zirconia restorations as it is for PFMs.
Even though zirconia is an incredibly strong material (approximately 1,345Mpa) and is stronger than most alloys, the veneering porcelain is still the weak link because it has a strength in the range of only 70Mpa. As with PFM technology, a zirconia understructure that provides adequate porcelain support is the best way to prevent fractures. Consider these four tips:
Design zirconia substructures so that any extension...
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