U. Baik, Jin Hye Kang, Ui-Lyong Lee, Nikhilesh R Vaid, Yoon-Ji Kim, Dong-Yul Lee
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引用次数: 4
摘要
目的探讨下颌第一磨牙(L-6)缺失或下颌乳牙第二磨牙(L-E)缺失引起的第二磨牙拔除后阻生第三磨牙自发内嵌的相关因素。材料与方法对因L-6或L-E缺失而行下颌第二磨牙拔除术的患者(男性14例,女性36例,平均年龄= 18.6±4.4岁)治疗前(T1)和拔除后(T2)的x线片进行分析。采用回归分析对影响第三摩尔化量的因素进行了研究。结果下颌第二磨牙在牙冠和牙根分叉处分别延长5.1±2.1 mm和5.8±2.7 mm。第二磨牙拔除后,第三磨牙在牙冠和牙根分叉处分别出现了4.3±1.6 mm和3.8±2.6 mm的自发内化。第三磨牙T1时Nolla的阶段(B = 0.20, P = 0.026)和第二磨牙的拔除时间(B = 0.04, P = 0.042)与第三磨牙的拔除量显著相关。结论治疗前第三磨牙Nolla期越高,第二磨牙牵出时间越长,第三磨牙内陷越大。
Factors associated with spontaneous mesialization of impacted mandibular third molars after second molar protraction.
OBJECTIVES
To investigate factors associated with spontaneous mesialization of impacted third molars after second molar protraction to close the space caused by a missing mandibular first molar (L-6) or retained deciduous mandibular second molars with a missing succedaneous premolar (L-E).
MATERIALS AND METHODS
Panoramic radiographs of patients treated with mandibular second molar protraction to close the space due to missing L-6 or L-E (14 males, 36 females, mean age = 18.6 ± 4.4 years) were analyzed before treatment (T1) and after second molar protraction (T2). Factors associated with the amount of third molar mesialization were investigated using regression analyses.
RESULTS
Mandibular second molars were protracted by 5.1 ± 2.1 mm and 5.8 ± 2.7 mm, measured at the crown and root furcation, respectively. After second molar protraction, third molars showed spontaneous mesialization by 4.3 ± 1.6 mm and 3.8 ± 2.6 mm, measured at the crown and root furcation, respectively. Nolla's stage of the third molar at T1 (B = 0.20, P = .026) and second molar protraction time (B = 0.04, P = .042) were significantly associated with the amount of third molar mesialization.
CONCLUSIONS
Greater third molar mesialization was observed when Nolla's stage of the third molar was higher before treatment and when the second molar protraction time was longer.