Clinical effecfs of modified Nance arch appliance in the treatment of ectopic eruption of maxillary first permanent molar
10.3760/cma.j.issn.1002-0098.2014.01.008
- VernacularTitle:改良Nance弓矫治器治疗上颌第一恒磨牙异位萌出的临床研究
- Author:
Yu WANG
1
;
He LIU
;
Lihong GE
Author Information
1. 100081,北京大学口腔医学院·口腔医院儿童口腔科
- Keywords:
Orthodontic appliance;
Tooth eruption,ectopic;
First permanent molar
- From:
Chinese Journal of Stomatology
2014;49(1):32-36
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the effect of modified Nance arch appliance in the treatment of ectopic eruption of maxillary first permanent molar.Methods Thirty children with unilateral ectopic eruption of maxillary first permanent molar were treated with modified Nance arch appliance.The mesial angle of the maxillary first permanent molars and the magnitude of the primary second molar distal root lesion before and after treatment were measured on the panoramic radiographs and analyzed statistically.Results All 30 children completed the treatment.The mesial angle of the ectopic side significantly changed from (75.2 ± 7.6) ° before the treatment to (92.9 ± 5.2) ° after the treatment(t =-11.082,P ＜ 0.05).The root lesion of the ectopic side significantly enlarged after the treatment,but there was no significant change on the normal side.Conclusions The treatment of ectopic eruption of the maxillary first permanent molar using modified Nance arch appliance was successful.The attention should be paid to the magnitude of the primary second molar distal root lesion before and after treatment and it is suggested to start the treatment when mild root resorption appears.
