关键词: 上唇系带, 附着异常, 上颌中切牙间隙, 治疗方法

Abstract:

The maxillary frenum locates in the facial aesthetic area， which is a mucous membrane fold that attaches the lip and the cheek to the alveolar mucosa， the gingiva， and the underlying periosteum and adapt to the mobility of lip. Its abnormal adhesion is closely related to the breastfeeding difficulties， plaque accumulation， child caries，the development of periodontal disease and maxillary midline diastema.  Therefore，it is important to treat abnormal adhesion of maxillary labial frenum timely. This article reviews the development and anatomic structure of maxillary labial frenum，the clinical classification and diagnostic methods of the abnormal adhesion of maxillary libial frenum，the relationship between abnormal adhesion of the maxillary labial frenum and maxillary midline diastema and its therapies.

Key words: maxillary labial frenum, abnormal adhesion, maxillary midline diastema, therapy