A Reliable Alternative for Extensive Tooth Structure Loss
If a cavity or fracture in a tooth is too large to be repaired with a standard composite filling but not extensive enough to require cutting down the tooth for a crown, “inlays” and “onlays” are preferred. Prepared in a laboratory rather than the clinical setting, these restorations fit seamlessly into the tooth cavity, much like a puzzle piece.
Why Are Inlay and Onlay Procedures Needed?
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Preservation of Sound Tooth Structure: Placing a crown on a tooth with extensive decay requires reducing the tooth’s entire circumference. In contrast, inlay and onlay procedures involve removing only the decayed portion of the tooth, leaving the remaining healthy enamel intact.
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Improving Marginal Fit: Large composite restorations placed directly in the mouth can undergo microscopic shrinkage during the hardening process. With laboratory-fabricated inlay/onlay restorations, this risk of shrinkage is eliminated, and the seal between the tooth and the restoration is maximized.
How does the treatment process proceed?
The treatment consists of two stages. In the first session, the tooth decay is removed, an impression of the tooth is taken using digital or traditional methods, and a temporary filling is placed. A custom-made filling block is fabricated in a laboratory setting from high-pressure-resistant composite or ceramic materials based on the impression. In the second session, the temporary filling is removed, and the prepared inlay/onlay restoration is permanently bonded to the tooth using strong adhesive systems.
Frequently Asked Questions
What is the difference between an inlay and an onlay?
The difference lies in the area covered by the restoration. An inlay is a smaller restoration situated between the cusps (the peaks) of the tooth, whereas an onlay is a type of restoration used for more extensive damage that covers one or more of the cusps.
Does it last longer than a standard filling?
Because it is hardened through special laboratory processes and offers superior marginal adaptation, it provides more durable and long-lasting functionality compared to standard fillings in teeth with extensive structural loss.
Conclusion
Composite inlay and onlay restorations combine dentistry with engineering precision to create a tissue-friendly and highly durable solution.