From the outside, the success of a crown is judged by its color and form. However, the real factor that determines the long-term outcome lies in a line that cannot be seen with the naked eye: the margin where the crown meets the tooth. A micron-level misfit in this region can, over time, pave the way for plaque accumulation, gum inflammation and marginal darkening. The zirconia crown impression is therefore the most critical step of treatment. As DijiDent Oral and Dental Health Polyclinic, at our clinic in Türkiye we support this stage with digital impressions.
Why Is Marginal Fit So Important?
The junction line between the crown and the tooth is a potential sheltering area for bacteria in the oral environment. The narrower and smoother this gap, the easier it is to clean. When the gap widens, plaque accumulates because the brush and floss cannot reach it; as a result, the gum becomes red, bleeds and can recede over time. A significant proportion of the darkening seen at crown margins is also the result of this process.
What Does a Digital Impression Provide at This Point?
- Instant control: When the scan is completed, the margin line is examined by magnifying it on screen. If there is an area that does not look clear, it is rescanned in the same session.
- No risk of deformation: Dimensional changes that can occur as the material stretches when removed from a physical mold or during the pouring of the plaster model do not arise.
- Direct transfer to production: The data is sent without intermediaries to the design software and then to the production unit.
- Recording of the bite: How the teeth close is recorded digitally; this helps prevent the crown from being too high.
Visibility of the Gum Margin
Digital scanning has one condition: the camera records whatever it sees. If the crown margin lies below the gum and that area is bleeding, the scan cannot read this margin. For this reason, gum health must be adequate before scanning and, if necessary, the margin must be temporarily exposed. This is why a patient with gum inflammation does not go directly to the crown stage; the foundation is prepared first.
The Unique Aspect of Zirconia
Zirconia is a material preferred for its durability and light transmission. It is produced by milling from blocks and then sintered. In this process, the predictable shrinkage of the material is taken into account. The accuracy of the digital data directly affects the precision of this calculation. In other words, the cleaner the data, the more predictable the production.
Effect on the Number of Sessions
The digital workflow can help reduce the back-and-forth experienced at the try-in stage. Sending the restoration to the laboratory over and over due to fit problems is both a waste of time and a tiring process for the patient. Nevertheless, it is necessary to be realistic here: a digital impression does not guarantee a treatment that will be completed in a single session. Material choice, aesthetic expectations and laboratory stages are the other factors that determine the duration.
The Temporary Crown Period
A temporary crown is used until the permanent restoration is ready. This period is not just an aesthetic interim solution; it preserves the shape of the gum and reduces sensitivity. It is also important that the temporary crown fits well, because an ill-fitting temporary restoration can cause gum inflammation and negatively affect the fit of the permanent crown.
Additional Records in the Aesthetic Zone
In front teeth, not only form but also color transitions and surface texture are important. For this reason, in addition to the digital impression, clinical photographs and shade records are taken. The ability of scanners to record color information helps the laboratory; however, the final shade selection is made with the dentist’s evaluation.
Frequently Asked Questions
Impression accuracy supports fit; however, lifespan depends on many factors such as oral care, the bite relationship and teeth clenching.
Marginal misfit may be one of the factors; gum recession and the underlying material also play a role. Evaluation is needed.
It is preferred in many cases; however, depending on the bite, teeth clenching and aesthetic expectations, different materials may be suitable.
It is recommended that gum health be established first. Otherwise, both the impression and the long-term result are negatively affected.
It varies by case. After planning, the estimated number of sessions is communicated to you.
The fit of your crown is determined at the first step.
If you are planning a zirconia or ceramic restoration, let us design the process with digital records. Contact us to book an appointment; let us prepare a plan at DijiDent Oral and Dental Health Polyclinic that also takes your gum health into account.
This content is for general information purposes. Material and method selection are determined by your dentist after the clinical examination.
