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Abstract Objective] To explore the efficacy of anterior traction therapy for osseous class Ⅲ malocclusion in chil‐dren at dental transitional period .[Methods] A total of 80 pediatric patients with osseous class Ⅲ malocclusion in dental transitional period at orthodontic department were chosen .According to the severity ,all patients were divided into treat‐ment group and control group with 40 patients in each group .The treatment group underwent anterior traction therapy , while the control group was not given any therapy during the observation .X‐ray lateral projection of cranium was per‐formed in treatment group and control group .The relevant indexes of variables at mandible plane and sagittal level inclu‐ding upper dental alveolus bed(SNA) angle ,bottom dental alveolus bed(SNB) angle ,ANB angle(the difference between SAN angle and SNA angle) ,face angle(FH‐NP) ,vertical distance between AH point and palatal plane(FH‐PP) ,cross angle of upper central incisor long axis to subspinale line(U1/NA) ,the distance between upper central incisor border and the line of nasal point to subspinale(U1‐NA) ,cross angle of long axis of inferior central incisor and NB line(L1/NB) and the distance of long axis of inferior central incisor and NB line(L1‐NB) were measured .[Results]Compared with the con‐trol group ,the SNA angle in treatment group was increased by 1 .370( P < 0 .05) ,and SNB angle was decreased by 1 .800 ,and ANB angle was increased to 3 .390( P <0 .05) ,but FH‐NP and FH‐PP were decreased( P <0 .05) ,and U1/NA was increased by 2 .13mm and increased to 3 .03mm( P<0 .05) ,and L1/NB was reduced by 3 .890 and reduced to 0 .86mm( P<0 .05) .The average amount of rotation of the treatment group and control group was 0 .82 and -0 .66 , respectively .[Conclusion] After anterior traction therapy for patients with osseous class Ⅲ malocclusion in dental transi‐tional period ,the mandible of patients has clockwise rotation ,and the maxillary mandibular relation is more concordant , and facial appearance is greatly improved than before .
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2014, Vol. 31 
