The Effects Of Maxillary Protraction Using Facemask And Correlation Between These Effects And Parameters Of Quantitative Cervical Vertebral Maturation (QCVM)

Objective: To assess the effects of maxillary protraction using facemask and the correlation between these effects and quantitative cervical vertebral maturation(QCVM).Methods: A total of 35 patients(16 boys,19 girls,mean age: 9.9 years)treated by maxillary protraction in the Stomatology Hospital of the CMU from were selected in this study.Lateral cephalograms were taken before and after treatment.Skeletal and dental variables were measured,and paired t-test and the multiple-regression analysis were performed.And then discuss the differences among the individuals according to the vertebral measurements.Results: There were no significant differences in A-X,ANS-X and B-Y,but significant increases occurred in the other measurements,such as SNA,SNB,and AX(P<0.01).H4/W4 had a significantly negative influence on the change in AY(P<0.05).Conclusions: The facemask therapy shows a favorable change in maxillary advancement,and among the variables of QCVM,H4/W4 has a significant negative effect on the effect of maxillary protraction.The skeletal change is ideal with a H4/W4 less than 0.5843.