Comparison of clinical effects between single-stage and two-stage orthodontic treatment for An's class malocclusion
Objective To compare the clinical effects of single and two-stage orthodontic treatment in patients with An's class Ⅱ malocclusion.Methods A total of 80 patients with An's class Ⅱ malocclusion who were treated in Puyang Oilfield General Hospital from January 2021 to January 2023 were selected and divided into the study group(n=40)and the control group(n=40)by randomized numerical table method.The control group was treated with single-stage orthodontic treatment,and the study group was treated with two-stage orthodontic treatment.The orthodontic standard index(PAR)values,facial aesthetic scores,orthodontic related parameters,and chewing function in both groups were compared between the two groups.Results After treatment,the PAR values in both groups were decreased,and the differences were statistically significant(P<0.05),and in comparision of the control group,the left and right molar relationships in the study group were lower,and the differences were statistically significant(P<0.05).After treatment,the aesthetic scores in both groups were increased(P<0.05),and in comparision of the control group,the study group was higher,and the differences were statistically significant(P<0.05).The upper alveolar seat angle(SNA),upper and lower alveolar seat angle(ANB),overlay(Overjet),overjaw(Overbite),Y-axis angle(SGn-SN),planar angle(FMIA),upper and lower mesial incisor angle(UI-LI),and mandibular convexity angle(NA-PgA)decreased,and the lower alveolar seat angle(SNB)increased in the two treatment groups,and the differences were statistically significant(P<0.05),and the SNA angle,ANB angle,Overjet,Overbite,SGn-SN' angle,and NA-PgA angle were smaller,and the SNB angle,FMIA angle,and UI-LI angle were larger in the study group compared with the control group,and the differences were statistically significant(P<0.05).After treatment,the chewing efficiency and bite force were improve in both groups after treatment and were higher in the study group than in the control group,and the differences were statistically significant(P<0.05).Conclusion Compared with single-stage orthodontic treatment,two-stage orthodontic treatment applied to An's Class Ⅱ malocclusion can increase PAR value,improve facial aesthetics and orthodontic parameters,and enhance chewing function,although the treatment time is longer.
single-stage orthodonticstwo-stage orthodonticsAn's class Ⅱ malocclusionclinical effects
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