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Inlays and Onlays: The Indirect Filling Options

Inlays and onlays are dental restorations used by a select number of dentists. In certain cases, inlays and onlays are a conservative alternative to full coverage dental crowns. Also known as indirect fillings, inlays and onlays offer a well-fitting, stronger, longer lasting reparative solution to tooth decay or similar damage. These restorations are beneficial from both an esthetic and functional point of view.

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Inlays and onlays can often be used in place of traditional dental fillings to treat tooth decay or similar structural damage. Whereas dental fillings are molded into place within the mouth during a dental visit, inlays and onlays are fabricated indirectly in a dental lab before being fitted and bonded to the damaged tooth by your dentist.

The restoration is dubbed an “inlay” when the material is bonded within the center of a tooth. Conversely, the restoration is dubbed an “onlay” when the extent of the damage requires inclusion of one or more cusps (points) of the tooth or full coverage of the biting surface.

Inlays and Onlays: The Benefits of the Conservative Approach
  • Superior Fit: Inlays and onlays offer a conservative preparation that preserves as much healthy tooth as possible. They are a great choice if you have minimal to moderate tooth decay that extends into a flossing area, offering an excellent alternative to full coverage crowns.
  • Tooth Color: Boasting esthetic longevity, inlays and onlays are not likely to discolor over time as tooth-colored resin fillings often do.
  • Tooth Structure Safeguard: Inlays and onlays preserve the maximum amount of healthy tooth structure while restoring decayed or damaged areas, helping to ensure functional longevity.
  • Easy Tooth Cleaning: Because the fit is tailored at all edges and the preparation minimal, your tooth can be easier to clean than it would be with full coverage restorative alternatives such as a dental crown. Composite fillings can shrink during the curing process, whereas prefabricated porcelain or gold inlays and onlays will not (ensuring a precise fit).
  • Tight Space Fulfillments: If you have a cavity between your teeth, consider an inlay rather than a direct composite filling. Inlays are better at sealing teeth to keep out bacteria; they are easy to clean, will not stain and offer exceptional longevity.
  • Strength and Stability: Inlays and onlays are extremely stable restorative solutions for the treatment of decay. The superior fit and durable material make inlays and onlays a stable choice that can actually strengthen a damaged tooth.
  • Weak Tooth Protector: An onlay can protect the weak areas of the tooth. The procedure does not require the complete reshaping of the tooth.

Inlays and Onlays: The Procedure
Typically, an inlay or onlay procedure is completed in two dental visits.

During your first visit, your dentist must prepare the damaged tooth. A molded impression of the tooth is then taken and sent to a dental laboratory, where an inlay or onlay is fabricated.

Inlays and onlays can be made from gold, porcelain or resin materials. The difference is in the appearance of the finished restoration. A fitted, provisional inlay or onlay (sometimes known as a temporary or “temp” for short) in the shape of the final restoration can be created during this visit to protect the tooth while the final restoration is being fabricated.

Your dentist might discuss with you the best type of inlay or onlay material to use. If esthetics is not a concern (for example, with back molars), gold is the best option. Porcelain inlays and onlays offer the best esthetics and are often used in the “smile line” areas. Resin materials may be the best option for people who grind their teeth and/or those with a misaligned bite (malocclusion).

During your second visit, the provisional temporary is removed and your inlay or onlay is placed.

Inlays and onlays are extremely stable restorations that seldom fail. Your dentist will check all margins to ensure a smooth fit with tight adjacent contacts. Your dentist will also check your bite to ensure that there are no occlusion-related problems affecting the margins of the restoration. Once fitted, the inlay or onlay is bonded onto the tooth and the margins are polished.