中文摘要：

咬唇颊症是长期习惯性咬嚼口腔黏膜所致的口腔黏膜慢性病损，主要表现为黏膜表面上皮呈脱屑样改变，患者可有轻度粗糙感。目前国内尚未见关于咬唇颊症统一的命名、译名及系统介绍，本文报道2例口腔咬唇颊症病例，并复习相关文献，讨论咬唇颊症可能的发病机制、临床表现、病理表现、诊断、鉴别诊断、治疗及预后等。

英文摘要：

Morsicatio buccarum et labiorum is a form of chronic oral mucosa disease caused by habitual cheek or lip biting. The affected mucosa shows a shredded appearance. The patients may feel their oral mucosa rough. In present, there have not been unified denomination and systematic introduction about this disease in our country. Two cases were reported here. The pathogenesis, clinical manifestation, pathology, diagnosis, differential diagnosis, treatment and prognosis about this disease were also discussed.