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Porcelain Veneer Preps
In an interesting article, Jefferey Rouse of San Antonio (J Prosthet Dent 1997, 78:545-9) discussed the interproximal preparation of porcelain veneers. By breaking the proximal contact and extending the preparation to the palatal of the tooth, certain advantages in veneer esthetics and retention are gained. By essentially doing a 3/4 crown preparation, you give the technician more cosmetic and functional freedom, and the following advantages are realized.
- Better hidden margins
- Increased retention
- More natural correction of malalignment
- Greater depth to the veneer shape in closing diastemas
- Decrease in the dark halo that occurs due to dark tooth discoloration
- More natural contours in correction of the black spaces that form with gingival recession
- Correction of the contact points, particularly between ceramic crowns and veneers
The disadvantages of this technique are:
- Icrease tooth preparation
- More difficult temporization
- A higher potential for sensativity
- Greater preparation accuracy necessary to secure adequate path of insertion
This preparation often happens inadvertently when we remove existing restorations. Perhaps it is time to think about adding this technique to our treatment planning options. Let me know if you have some other insights into this.
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