A wedge-shaped defect at the cervical area of a tooth, the cause of which is related to microfracture of the tooth structure in areas of concentration of stress, is called:

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Abfraction is a type of non-carious cervical lesion that occurs due to the biomechanical loading of the tooth, resulting in microfractures at the cervical area. Attrition is the wearing away of tooth structure due to tooth-to-tooth contact, erosion is the loss of tooth structure by chemical processes, and abrasion is the loss of tooth structure due to mechanical processes such as brushing too hard or biting on hard objects.

A Wedge-Shaped Defect at the Cervical Area of a Tooth