Zirconia is the most widely used type of all-ceramic crown, with no metal substructure. What patients most often want to know is how the process unfolds and how many appointments it takes. In this article we go through the stages of a zirconia crown, from planning to cementation, in order.
1. Examination and Planning
In the first stage, the condition of the teeth and gums is assessed. Any decay, need for root canal treatment, or gum inflammation is treated before the crown work begins. The bite relationship and the patient's expectations are established at this stage; where useful, digital smile design is used to visualize the result in advance.
2. Tooth Preparation
A controlled amount of tooth structure is removed to create the space the crown will sit in. The strength of zirconia allows for more limited preparation in some cases compared with metal-supported crowns. The procedure is performed under local anesthesia.
3. Impression or Digital Scan
Once preparation is complete, an impression of the teeth is taken. This can be done with conventional impression material or digitally with an intraoral scanner. Digital scanning removes the discomfort of impression material and allows the data to be transferred directly into the design software.
4. Temporary Crown
Prepared teeth are protected with temporary crowns until the definitive crown is ready. A temporary crown isn't only for appearance; it protects the tooth from external factors, reduces sensitivity and maintains the shape of the gum. Hard and sticky foods should be avoided during this period.
5. CAD/CAM Production
The form of the crown is designed on the digital model (CAD). The substructure is then produced from a zirconia block by milling or the relevant production method (CAM). The produced substructure is sintered at high temperature; at this stage the material reaches its final hardness and shrinks slightly to the planned dimensions.
6. Shade and Surface Characterization
The crown's shade is determined with a shade guide so it harmonizes with neighboring teeth. For a natural appearance, ceramic layers that give translucency and character can be applied to the surface, or surface staining can be used on monolithic zirconia.
7. Try-In and Cementation
The definitive crown is first tried in: margin fit, bite relationship, shade and gum harmony are all checked. After any adjustments, the crown is cemented to the tooth with a suitable cement and the bite is checked one final time.
How Many Appointments Does It Take?
Depending on the scope of the case, treatment is usually completed over a few appointments: preparation and impression, try-in, and cementation. Where preliminary work is needed (root canal or gum treatment), the process can take longer. The exact timeline is given by your dentist after examination.
What to Pay Attention to Afterward
Mild sensitivity in the first few days is normal. Long-term, the lifespan of the crown depends largely on gum health and daily care; for details, read our article on zirconia crown lifespan and care. For material comparisons, see zirconia or porcelain laminate and metal-supported or all-ceramic. For general information, see our zirconia crown page.
Two Common Questions
What should I do if a temporary crown comes off? The tooth would be left exposed, so let your dentist know and have the temporary re-cemented; protecting the tooth during this period matters.
Can the shade be changed at the try-in stage? Yes. Shade and form can be adjusted before the crown is cemented, which is why your feedback at the try-in stage is important.
Summary
A zirconia crown involves examination and planning, tooth preparation, impression or digital scanning, a temporary crown, CAD/CAM production, characterization, and try-in and cementation. The process is usually completed over a few appointments. Both the quality and the lifespan of the result depend on the preparation beforehand and the care afterward.
This article is intended for general information purposes. A clinical examination is required to determine the right treatment plan for you.
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