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Questions and Answers
What is the primary component of zirconia posts?
What is the primary component of zirconia posts?
- Ceramic material
- Resin core material
- Yttrium oxide
- Zirconium dioxide (correct)
What is a limitation of bonding resins to zirconia posts?
What is a limitation of bonding resins to zirconia posts?
- They are less predictable and require substantially different bonding methods (correct)
- They require less preparation
- They are more esthetic
- They are more flexible
What is a concern about the rigidity of zirconia posts?
What is a concern about the rigidity of zirconia posts?
- It makes them more flexible
- It makes them stronger
- It makes them more esthetic
- It tends to make them more brittle (correct)
What is a problem when building a composite core on a zirconia post?
What is a problem when building a composite core on a zirconia post?
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What is the effect of the rigidity of zirconia posts on the interface between the resin core material and dentin?
What is the effect of the rigidity of zirconia posts on the interface between the resin core material and dentin?
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Study Notes
Zirconia Posts
- Composed of zirconium dioxide (ZrO2) partially stabilized with yttrium oxide
- Exhibit high flexural strength
- Esthetic, partially adhesive, very rigid, but also brittle
Properties and Limitations
- Cannot be etched
- Bonding resins to zirconia posts is less predictable and requires substantially different bonding methods than conventional ceramics
- Core retention may be a problem when a composite core is built on a zirconia post
Bonding Issues
- Controversies exist about the efficiency of airborne particle abrasion at establishing a durable resin bond to zirconia posts
- Treatment with a coupling agent may be necessary to improve bonding
- Rigidity of zirconia posts can negatively affect the quality of the interface between the resin core material and dentin when subjected to fatigue testing
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