Although there are some adjustments that might slightly roughen the surface of Zirconia restorations, it should still be easy to polish to create an exceptionally smooth surface. Excess cement, if there’s any, must be removed to avoid plaque formation that can lead to tooth sensitivity and periodontal disease. Oftentimes, marginal finishing is required when fitting and cementing a Zirconia restoration. Occlusal edges or sharp incisal are also not suitable for Zirconia restorations.Ĭementing and Finishing a Zirconia Restoration A 90-degree shoulder is also unacceptable as well as parallel wall preparations. In order for a crown prep to be acceptable for a Zirconia crown restoration, the prep should not have any undercuts nor a gutter preparation. All occlusal edges should be rounded.įactors That Make Crown Preparations Unacceptable for Zirconia Restorations Similar to that of anterior crown preparation, a bevel is should also not be used. There is also a need for visible and continuous circumferential chamfer and reduction-wise, there should be at least 0.5mm at the gingival margin. The preparation should be tapered between an angle of 4 and 8 degrees. When preparing a tooth for posterior Zirconia crowns, on the other hand, you need to make sure that there is enough room for the wall thickness to have a minimum of 0.5mm and at least between 1mm and 1.5mm or 1.5 to 2mm occlusal reduction. PREPARATION GUIDELINES FOR POSTERIOR ZIRCONIA CROWNS All incisal edges should also be rounded. It is also important for the vertical and horizontal preparation of the tooth should have an angle of approximately 5 degrees and a bevel is certainly not advisable. There should also be a visible and continuous circumferential chamfer with at least 0.5mm reduction at the gingival margin. When the dentist is preparing a tooth for an interior Zirconia crown, there should be enough room for the wall thickness – there should be a required minimum of 0.3mm and at least 1.0mm and 1.5mm, or 1.8 to 2.0mm incisal reduction.
PREPARATION GUIDELINES FOR ANTERIOR ZIRCONIA CROWNS Know more about the different preparations here: If dental professionals want to maximise the success of Zirconia restorations as well as to have minimal chair time, it is of utmost importance that the proper preparation and guidelines are followed. In addition to improved esthetics, the physical properties of Zirconia also allow for strength, durability, and precision-fitting restorations.
It has proven to be a great improvement since there is a wider array of available milling pucks that allow for greater shade translucencies and variation that closely resemble natural teeth. Zirconia restorations, since its debut in the dental industry, have become the better choice for dentists who aim to provide their patients with the most technologically-advanced metal-free dental restorations.
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