The exposed zirconia surfaces were not glazed, but rather diamond polished to create...See more a surface that would be kinder to opposing natural dentition. Studies indicate that highly polished zirconia wears opposing enamel less than enamel against enamel and that glazed zirconia wears more. Unpolished, rough zirconia wears most of all.* It's important to note that zirconia restorations must be repolished if any adjustment occurs chairside.
*Luangruangrong P, Cook NB, Sabrah AH, Hara AT, Bottino MC. Influence of Full-Contour Zirconia Surface Roughness on Wear of Glass-Ceramics. J Prosthodont. 2013 Jul 22. [Epub ahead of print].
Kim MJ, Oh SH, Kim JH, Ju SW, Seo DG, Jun SH, Ahn JS, Ryu JJ. Wear evaluation of the human enamel opposing different Y-TZP dental ceramics and other porcelains. J Dent. 2012 Nov;40(11):979-88. Epub 2012 Aug 11.
In preparation for the anterior porcelain veneer, the zirconia bridge was manually cut back...See more and characterized. The incisal edge of the maxillary bridge retained its full anatomic contour in the functional loading area, protecting the edge and preventing chipping.
Step 8: During the try-in procedure, the restorations appear to be lower in value relative to...See more the neighboring teeth. This visual outcome was due, in part, to the dehydration process on the laterals and canines that makes the enamel appear temporarily whiter. In addition, the use of a "clear" material for the try-in paste contributed to the overall temporary contrast in value.
In most cases, a critical point to consider is the undesirable and permanent contrast in value that can occur between bonded porcelain restorations fabricated with minimal thickness (0.3mm-0.5mm) and their neighboring, non-restored teeth. In my experience, when a clear material is used for bonding anterior porcelain restorations, it almost always causes a permanent reduction in the overall value of the final units. Using a clear material for bonding is of no significant esthetic consequence for posterior restorations but for anterior restorations, using a chromatic material (dentin shade) is always preferable.
Step 3: During the crown fabrication, I used a wash layer of Noritake Creamy White Luster Porcelain...See more to mask the discoloration on tooth #9. To restore the shape of the tooth, I used a thin layer of Opacious Body White. Using a thin layer of material was critical to ensure that I changed the value of the discolored tooth without blocking light transmission.
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Interested in learning more about Multimat NTX/NTX PRESS Porcelain...See more Furnaces.
Professionally managed group practices only represent a small segment (7 to 8%) of the dental profession, but their explosive growth in the last few years indicates that they will continue to grow.
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