Dental Inlays/Onlays for Dental Restoration
When a tooth becomes extensively fractured or decayed, dental inlays/onlays can provide an effective means for restoration. The experienced dentistry team at Hawkins Family Dental provide dental inlays/onlays, as well as many other restorative dentistry procedures.
In restorative dentistry, an inlay is an indirect restoration (filling) consisting of a solid substance (such as gold, porcelain or less often a cured composite resin) which is fitted to a cavity in a tooth and cemented into place.
An onlay is the same as an inlay, except that it extends to replace a cusp. Crowns are dental onlays which completely cover all surfaces of a tooth.
Dental Inlays Overview
Sometimes, a tooth is planned to be restored with an intracoronal restoration, but the decay or fracture is so extensive that a direct restoration, such as amalgam or composite, would compromise the structural integrity of the restored tooth or provide substandard opposition to occlusal (i.e., biting) forces. In such situations, an indirect gold or porcelain inlay restoration may be indicated.
Comparison of Inlays and Direct Fillings
When a tooth inlay is used, the tooth-to-restoration margin may be finished and polished to a very fine line of contact to minimize recurrent decay. Opposed to this, direct composite tooth filling pastes shrink a few percent in volume during hardening. This can lead to shrinkage stress and rarely to marginal gaps and failure.
Although improvements of the composite resins could be archived in the last years, solid inlays do exclude this problem. Another advantage of inlays over direct dental fillings is that there is almost no limitations in the choice of material. While inlays might be ten times the price of direct restorations, it is often expected that inlays are superior in terms of resistance to occlusal forces, protection against recurrent decay, precision of fabrication, marginal integrity, proper contouring for gingival (tissue) health, and ease of cleansing offers.
However, this might be only the case for gold inlays. While short term studies come to inconsistent conclusions, a respectable number of long-term studies detect no significantly lower failure rates of ceramic or composite inlays compared to composite direct fillings. Another study detected an increased survival time of composite resin inlays but it was rated to not necessarily justify their bigger effort and price.
Dental Onlays Overview
When tooth decay or fracture incorporate areas of a tooth that make amalgam or composite restorations inadequate, such as cuspal fracture or remaining tooth structure that undermines perimeter walls of a tooth, a tooth onlay might be indicated.
Similar to an inlay, a dental onlay is an indirect restoration which incorporates a cusp or cusps by covering or onlaying the missing cusps. All of the benefits of an inlay are present in the onlay restoration. The onlay allows for conservation of tooth structure when the only alternative is to totally eliminate cusps and perimeter walls for restoration with a crown.
Similar to tooth inlays, onlays are fabricated outside of the mouth and are typically made out of gold or porcelain. Gold restorations have been around for many years and have an excellent track record.
In recent years, newer types of porcelains have been developed that seem to rival the longevity of gold. If the dental onlay or inlay is made in a dental laboratory, a temporary is fabricated while the restoration is custom-made for the patient. A return visit to our dental office is then required to fit the final prosthesis. Inlays and onlays may also be fabricated out of porcelain and delivered the same day utilizing techniques and technologies relating to CAD/CAM dentistry.
If you’re interested in learn more about dental inlays and the cost associated with this restorative dental procedure, Hawkins Family Dental can help educate you on more specific matters regarding your unique situation.