ABSTRACT
Objective:To investigate the indications of lower incisor extraction in orthodontic treatment of malocclusions. Methods:42 patients (males 16,females 26) were divided into four groups: abnormal Bolton index; class III malocclusions with anterior teeth cross bite; one congenital lower incisor losing; and anterior teeth area periodontal disease.One lower incisor extraction, one lower incisor and other teeth extraction and other accessorial therapy were used in the treatment. Results:According to these four different conditions, alternative treatment plans of lower incisor extraction should be determined. For the former two conditions, one lower incisor was extracted; A lower incisor and two maxillary first premolars were extracted in the third condition, in which lower canines and first premolars should be grinded to improve esthetics; In the last condition, some maxillary teeth need stripping besides extracting one lower incisor. All of the 42 cases achieved satisfactory results, normal overbite and overjet and stable occlusal relationship. Conclusion:To be well acquainted with the indications of the extraction of the lower incisor in orthodontic treatment of malocclusions can help to achieve satisfactory clinical effect.