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[Treatment of Class II division 1 malocclusions with single maxillary extraction orthodontics]
1Department of Orthodontics, Beijing Hospital for Stomatology, Capital University of Medical Sciences, Beijing 100050, China.
Objective:
To investigate the effects, indications and clinical significance of single maxillary extraction orthodontics used for class II division 1 malocclusions.
Methods:
14 class II division 1 patients were treated by single maxillary extraction orthodontics, the cephalometric data before and after treatment were analysed by statistical methods.
Results:
After treatment, 1. the angle 1-FH had decreased by 11.03 degrees and the angle 1-MP had increased by 3.07 degrees; 2. The mandibular length had increased by 3.30 mm; 3. the upper and lower lip were retruded by 2.65 mm and 1.64 mm respectively. Statistical significance (P < 0.001-0.05) was found between the means before and after treatment.
Conclusions:
Single maxillary extraction orthodontics is suitable for class II division 1 patients with less labial tipping of lower incisors and less lip protrusion.