The effect of Frankel Ⅲ orthodontic appliance combined with lip muscle training in the treatment of malocclusion during mixed dentition
PURPOSE:To exploring the clinical effect of lip muscle training combined with Frankel Ⅲ orthodontic appli-ances in correcting Class Ⅲ malocclusion during the mixed dentition period.METHODS:One hundred children with Class Ⅲ malocclusion during the mixed dentition period admitted to Hangzhou Greentown Stomatological Hospital from June 2018 to December 2022 were selected.The children were randomly divided into a combination group(treated with lip muscle training and Frankel Ⅲ orthodontic appliance)and a control group(treated with Frankel Ⅲ orthodontic appli-ance),with 50 cases in each group.X-ray cephalometric indicators,temporomandibular joint parameters,upper airway measurement parameters and 12 month follow-up of the two groups of children were compared before and after treatment.SPSS 21.0 software package was used for statistical analysis.RESULTS:Before treatment,there was no significant differ-ence of SNA,SNB,ANB,U1-NA,L1-NB,ANS-Ptm,S-Ptm,Co Po,Co-S,MP-SN,MP-FH and NP-FH between the combination group and the control group(P＞0.05).After treatment,ANB,U1-NA,L1-NB and MP-SN in the combination group were significantly higher than those in the control group,while NP-FH were significantly lower than that in the con-trol group(P＜0.05).Before treatment,there was no significant difference of the joint space,anterior joint space and posteri-or joint space between the combination group and the control group patients(P＞0.05);after treatment,the joint space and the joint space in the combination group were significantly higher than those in the control group(P＜0.05).Before treat ment,there was no significant difference of Ba PNS,Ad1 PNS,Ad2 PNS,Mc1 Mc2,SPP-SPPW,U-MPW,PAS and V-LPW between the combination group and the control group(P＞0.05);after treatment,Ad2-PNS in the combination group was significantly higher than that in the control group(P＜0.05).After 12 months of follow-up,the recurrence rate of the combination group was 2.00％,which was significantly lower than that(16.00％)of the control group(P＜0.05).CON-CLUSIONS:The combination of lip muscle training and Frankel Ⅲ orthodontic appliances is more conducive to correct-ing Class Ⅲ malocclusion during the replacement period,improving upper airway morphology,and reducing the recur-rence rate after treatment.
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