Ceramic overlays for worn teeth: the case for preserving healthy tooth structure

When teeth are worn by bruxism, acid erosion, or abrasion, the treatment proposal patients most frequently receive is full-arch crown rehabilitation. In many cases, a different approach exists. A conventional crown requires the removal of approximately 65-75% of original coronal tooth structure, healthy or not, to create the space the restoration requires. Adhesive ceramic overlays take a different path.

How an overlay works on worn teeth

An overlay is an indirect restoration that covers occlusal surfaces and, where needed, vestibular surfaces, without involving the axial walls of the tooth when these remain intact. In worn teeth, where occlusal and incisal structural loss has already occurred pathologically, overlay preparation can be minimal or entirely absent: the restoration occupies the space already created by wear, bonded to residual enamel and dentine.

Adhesive bonding to residual tissues provides mechanical resistance comparable to that of a full crown. Long-term peer-reviewed studies report ceramic overlay survival rates above 85% at ten years in patients with correct clinical indication.

Material choice

Feldspathic ceramic, the material with optical properties most closely resembling natural enamel, is indicated for anterior restorations and posterior areas with moderate occlusal loading. In patients with bruxism or in posterior sectors subject to intense forces, lithium disilicate offers higher fracture resistance with optical properties still superior to zirconia.

When an overlay is not appropriate

Not every worn tooth is a candidate for an overlay. When residual coronal structure is too limited for reliable adhesive bonding, or when wear has exceeded the threshold beyond which an overlay cannot provide adequate retention and resistance, the correct restoration is a crown. The decision is clinical: it depends on the amount of residual enamel, tooth position, and the occlusal situation.

In many patients quoted for full-arch crown rehabilitation, an independent assessment reveals that a significant proportion of teeth can be treated with overlays. A second opinion in these cases is not a luxury: it is protection of the patient’s biological capital.

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