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Non-carious cervical lesions  (NCCL)


Abstract

The cervical junction constitutes the anatomic limit between the crown and the root.1 Cervical lesions display two major variations: wedge-shaped and saucer-shaped lesions. Other lesion aspects have also been reported: shallow, concave, notched and irregular
lesions. The cervical junction includes three different structures: enamel, dentin, and cementum, each displaying specific properties. Cervical lesions result from attrition,
erosion, abrasion, or abfraction. There is a consensus on the etiology of three first types of
lesions, however what is leading to an abfraction is a matter of discussion, with diverging etiological factors that remains controversial. Either it could be a stress-induced lesion related to the distribution of von Mises forces that potentiate cervical wear, or it is related
to the physicochemical differences between enamel, cementum, and dentin, including their
respective density and resistance to abrasives (brushing, toothpastes, acidic beverages and foods). Restorations are using mostly glass ionomer cements or resin-based composites.
Failures of cervical adhesive restorations are numerous. The selection of appropriate
treatment protocols implies substantial changes in the habits of the patient (tooth brushing,
acidic beverages, and food intake), and the removal of excess material and final polishing.

Keywords

Cementum-dentin junction, enamel-cementum junction, wedge-shaped, saucer-shaped lesions, attrition, erosion, abrasion, abfraction, glass ionomer cements, resin-based cements

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