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Effects of Distal Jet for molar distalization on eruption of second molar

BAI Yu-Ming, DUAN Yin-Zhong, LI Dong, GUO Jun Department of Orthodontics, Stomolgocial College, Fourth Military Medical University, Xi'an 710033, China  
AIM: To assess the effects of Distal Jet for the first molar distalization on the eruption of maxillary second molar. METHODS: The dental cast and cephalograms of 28 patients with classⅡ malocclusion were analyzed. The group of Distal Jet appliance had 13 patients, and the group of control orthodontics treatment (non-extraction) had 15 patients. 9 linear and proportional, angular measurements were made. Analysis of variance was applied in statistical analysis of the two groups. RESULTS: Significant difference was found in the 9 linear and proportional, angulars measurements in the two groups(P0.01). The mean mesiobuccal rotation of the second molars was 4.2°±0.6°. The changes of m2-SN (°) (before treatment 54.3±3.7, after treatment 48.0±3.5) and m2-Ptv (mm) (before treatment 12.8±1.6, after treatment 9.7±1.4) in the second molar region indicated that both expansion and tipping occurred in the second molar. CONCLUSION: Mesiobuccal rotation and vestibular drift of second molars occur with the application of Distal Jet for first molar distalization.
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