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Lab talk, the good, the bad, and the ugly
Zirconium
Ivoclar Prime
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<blockquote data-quote="Patrick Coon" data-source="post: 304121" data-attributes="member: 11366"><p>Not if they are using different translucencies. Most layered disks on the market are using the same translucency powder in different shades to give that layered look. </p><p></p><p>Lets think about restorations in general. </p><p></p><p> PFMs: layering porcelain is only 90MPa done lots of restorations with full occlusal porcelain with no issues (if done correctly)</p><p> Lithium Disilicate: ~500MPA again, lots of restorations out there with no issues</p><p> Layered Zirconia: ~1150MPa for substructure and 90MPa for layering. Again lots out there with no chipping.</p><p> Full contour Zirconia: anywhere from 550MPa to 1200+MPa. no problems when indications are followed correctly.</p><p></p><p> If I'm doing a large bridge with PRIME, then I want to make sure that the Majority of the connector is in the 1100MPa area (at least 7 sq mm) to get that strength to resist fracture. My 650MPa occlusal and incisal areas are still more than 7 times the flexural strength and 2.5 times the fracture toughness of the layered porcelain you put on any restoration.</p></blockquote><p></p>
[QUOTE="Patrick Coon, post: 304121, member: 11366"] Not if they are using different translucencies. Most layered disks on the market are using the same translucency powder in different shades to give that layered look. Lets think about restorations in general. PFMs: layering porcelain is only 90MPa done lots of restorations with full occlusal porcelain with no issues (if done correctly) Lithium Disilicate: ~500MPA again, lots of restorations out there with no issues Layered Zirconia: ~1150MPa for substructure and 90MPa for layering. Again lots out there with no chipping. Full contour Zirconia: anywhere from 550MPa to 1200+MPa. no problems when indications are followed correctly. If I'm doing a large bridge with PRIME, then I want to make sure that the Majority of the connector is in the 1100MPa area (at least 7 sq mm) to get that strength to resist fracture. My 650MPa occlusal and incisal areas are still more than 7 times the flexural strength and 2.5 times the fracture toughness of the layered porcelain you put on any restoration. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Zirconium
Ivoclar Prime
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