Wang Yu, Liu He, Ge Lihong
Department of Pediatric Dentistry, Peking University School and Hospital of Stomatology, Beijing 100081, China.
Department of Pediatric Dentistry, Peking University School and Hospital of Stomatology, Beijing 100081, China. Email:
Zhonghua Kou Qiang Yi Xue Za Zhi. 2014 Jan;49(1):32-6.
To evaluate the effect of modified Nance arch appliance in the treatment of ectopic eruption of maxillary first permanent molar.
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.
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.
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.
评估改良Nance弓矫治器治疗上颌第一恒磨牙异位萌出的效果。
对30例单侧上颌第一恒磨牙异位萌出的患儿采用改良Nance弓矫治器进行治疗。在全景片上测量治疗前后上颌第一恒磨牙的近中角及乳磨牙远中根病变程度，并进行统计学分析。
30例患儿均完成治疗。异位侧近中角由治疗前的（75.2±7.6）°显著改变为治疗后的（92.9±5.2）°（t=-11.082，P<0.05）。治疗后异位侧牙根病变显著增大，而正常侧无明显变化。
改良Nance弓矫治器治疗上颌第一恒磨牙异位萌出取得成功。治疗前后应关注乳磨牙远中根病变程度，建议在轻度牙根吸收出现时开始治疗。
