Abstract
Objective To compared treatment efficacy between Twin Twin-block appliance and Non-bracket invisible orthodontic appliance without bracket for patients with angle class Ⅱ1 malocclusion mandibular retraction.Methods 100 cases patients with angle class Ⅱ1 malocclusion mandibular retraction in the hospital from January 2018 to December 2022,according to the random number table method,they were divided into invisible group and Twin-block group,with 50 cases in each group.The invisible group was treated with non-bracket invisible orthodontic appliance,and the Twin-block group was treated with Twin-block appliance.The treatment efficacy were compared before and after treatment.Results The treatment time in the Twin-block group was(8.95±1.48)months,which was longer than that in the invisible group(7.15±2.55)months,the difference was statistically significant(P＜0.05).There was no statistically significant difference in SNB,SNA,ANB,U1-NA angle,U1-SN angle,L1-NB distance,U1-NA distance,Go-Gn,A-Go between the two groups before treatment(P＞0.05),after treatment,the SNA,ANB,U1-NA angle,U1-SN angle,and U1-NA distance of the two groups were all smaller than before treatment,while the SNB,L1-NB distance,Go-Gn,and Ar-Go were larger than before treatment,the Go-Gn and Ar-Go levels in the Twin-block group were higher than those in the invisible group,the difference was statistically significant(P＜0.05).There was no statistically significant difference in H-NP,H-CVP,H-PP,H-Or,H-MP,H-PNS,and H-FH between the two groups before treatment(P＞0.05),the measured values after treatment in both groups were greater than before treatment,H-FH in the Twin-block group were higher than those in the invisible group,the difference was statistically significant(P＜0.05).There was no statistically significant difference in SPP-SPPW,PNS-Ba,Mc1-Mc2,U-MPW,and V-LPW between the two groups before treatment(P＞0.05),the measured values after treatment in both groups were greater than before treatment,PNS-Ba in the Twin-block group were higher than those in the invisible group,the difference was statistically significant(P＜0.05).There was no statistically significant difference in coverage,jaw coverage,chin sulcus inclination,nasolabial angle,and chin soft tissue thickness between the two groups before treatment(P＞0.05),the coverage and jaw coverage of the two groups were all smaller than before treatment,while the chin sulcus inclination,nasolabial angle,and chin soft tissue thickness were larger than before treatment,the coverage and jaw coverage in the Twin-block group were smaller than those in the invisible group,the chin sulcus inclination,nasolabial angle,and chin soft tissue thickness in the Twin-block group were higher than those in the invisible group,the difference was statistically significant(P＜0.05).Conclusion The treatment of angle class Ⅱ1 malocclusion mandibular retraction with Twin-block appliance and non-bracket invisible orthodontic appliance has a certain effect,while the former has a more obvious effect on improving hyoid position and facial aesthetics and sagittal diameter of upper airway,but the correction time is a little longer.关键词
安氏Ⅱ类1分类错(牙合)畸形/下颌后缩/Twin-block矫治器/无托槽隐形矫治器/疗效Key words
Angle Class Ⅱ1 malocclusion/mandibular retraction/Twin-block appliance/non-bracket invisible orthodontic appliance without bracket/treatment efficacy分类
医药卫生
