FAQs – Inlays and Onlays

Inlays and onlays are ways of repairing relatively extensive tooth decay or damage without having to replace the whole outer portion of the tooth as with a crown. Less tooth material is removed so inlays and onlays tend to be more conservative and esthetic than crowns. Unlike fillings, these procedures strengthen a tooth’s structure. They also tend to last longer than a filling, because the inlay or onlay material is custom made and bonded to the tooth.

At the initial consultation, the dentist will determine whether the tooth can be repaired using an inlay or onlay procedure or whether a more extensive treatment, such as a crown, is needed. Once it is determined that an inlay or onlay will suffice, a decision needs to be made as to the material. Gold has the longest track record, but it does tend to be less esthetical appealing. Porcelain and tooth coloured composite resin are two other choices of material for the new tooth structure. Because both of these materials are tooth coloured they are particularly favoured if the tooth is visible or if esthetic results are an important goal.

Inlays and onlays are performed using very similar procedures. Both require two trips to the dentist. At the first appointment, the dentist begins the procedure by numbing the area using a local anaesthetic. The decay or damage is removed using a drill, preparing the tooth for its new surface. After all the damage is removed, an impression is made of the prepared tooth so the inlay or onlay material can be cast in a form that will fit the tooth exactly. A temporary restoration is placed on the tooth to protect it until the laboratory makes the new structure and it can be bonded to the tooth. This can take about two to three weeks.

Using the impression, a laboratory prepares the new tooth surface using gold, porcelain, or composite resin. Upon return to the dental clinic, the temporary restoration is removed and the surface is cleaned to prepare for the new structure. The dentist will then try in the new restoration to ensure that there is a correct fit that doesn’t interfere with your bite.

If the fit is good, using special cement or bonding, the inlay or onlay is permanently attached to the tooth. Some minor adjustment may need to be made to the restoration if there are interferences. To finish the procedure, the dentist will polish the cemented or bonded structure and tooth.

Generally, each visit will take about one hour, although the first appointment tends to be longer with an onlay as more tooth structure is removed.

The procedure is performed during two visits to the dental clinic.

Local anaesthetic takes care of the pain that would occur with the preparation of the tooth. Residual pain after the preparation or after cementing the structure in place is relatively rare and can usually be taken care of using over-the-counter medicines such as aspirin.

After the procedure there may be a little discomfort with the inlay or onlay, but many people adapt immediately to the new chewing surfaces. Sometimes the tissue around the work is sore or the tooth is temporarily sensitive to cold or hot foods. These minor problems should resolve themselves in one or two days.

Recovery is often immediate, with any discomfort taken care of using over-the-counter medicines.

Gold inlays and onlays will last 10 to 30 years, given proper care and avoidance of abuse. Although the structures do strengthen the teeth, it is still a good idea to avoid chewing ice, pits, or other very hard objects, as they could damage the work.

The ideal candidate will have too much damage or decay to be treated using a filling, but enough healthy teeth left that a crown is unnecessary.

If you require any further information please contact our friendly staff at a perfect smile clinic.