口腔衛生症例報告

The enamel layer is thinnest at the cervical region of the teeth, which is a structural weak point. The combined actions of erosion, abrasion, and abfraction stress flexure might destroy the thin enamel layer or cause enamel disintegration in the tooth cervix, exposing dentine or pulp. Noncarious cervical lesions characterised by tooth structure loss at the cemento-enamel junction have no relationship to dental caries. The appearance of NCCLs varies; some have shallow depressions, while others have broad, disc-shaped or huge, wedge-shaped abnormalities. Meanwhile, the cervix of the tooth is the most commonly impacted region by dentine hypersensitivity, an unpleasant sensation caused by exposed cervical dentine in reaction to temperature, evaporative, and tactile stimuli, among others [1].

Orthokeratinised odontogenic cyst (OOC) is a developmental odontogenic cyst. It was previously classified as an orthokeratinised variant of the odontogenic keratocyst (OKC). However, due to the difference in histopathological features and clinical behaviour, it is now considered a distinct entity. OOCs are uncommon findings and the presence of bilateral lesions are even rarer. This article presents an unusual case of a 14-year-old male patient who was treated for bilateral OOCs in the posterior mandible, both of which were incidental findings.