PFM Crowns / Zirconia Crowns and Restorations
Porcelain Fused to Metal Crown. photo credit: Dale Dental
Tips / pointers on PFM crowns (metal ceramic) and Zirconia Crowns (zirconia ceramic) and restorations
1. Although PFM restorations were most trouble free, CZR Press was pressed over zirconia, these restoration were equal to the best PFM.
2. Dentists must remove more tooth structure for zirconia (2 mm occlusally, 1.5 mm axially, 1.2 mm chamfer margins) and cut clearly visible margins for CAD/CAM.
3. Labs must alter framework design offered by software to achieve durable connector size and shape and for proper ceramic support at cusp tips, marginal ridges, etc.
4. Labs should keep occlusal anatomy simple with rounded surfaces at edges of the occlusal table to minimize chips and shearing.
5. Dentists must limit grinding of ceramic for occlusal adjustment to include only high spots—grinding on fired ceramic initiates degradation.
6. Labs and dentists be aware that ceramic breaks are not seen well clinically, but can be felt by patient’s tongue. Generally, defects progress in size and number over time.
Source: Clinicians Report
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