Power Arm在隐形矫治器联合微种植钉整体内收上前牙中作用的三维有限元分析
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1.军事口腔医学国家重点实验室,国家口腔疾病临床医学研究中心,陕西省口腔疾病临床研究中心,第四军医大学口腔医院正畸科;2.61150部队医院

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军事口腔医学国家重点实验室(2017ZB03)


The Effect of Power Arm When Combined Use of Clear Aligner and Miniscrew for En-masse Retraction of Maxillary Anterior teeth:A finite Element Analysis
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1.State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shanxi Clinical Research Center for Oral Diseases,Department Orthodontics,School of Stomatology,The Fourth Military Medical University,Xi’an;2.The Hospital of Chinese People'3.'4.s Liberation Army 61150

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State Key Laboratory of Military Stomatology (Program No. 2017ZB03)

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    摘要:

    目的:探讨Power arm在CA联合MIA整体内收上前牙中作用的生物力学效应,为临床应用提供参考。方法:建立CA联合MIA整体内收上前牙的三维有限元模型,在尖牙或是尖牙所对应矫治器上加入高6mm的Power arm,分析①矫治器施力+尖牙150g牵引力整体内收上前牙②矫治器施力+矫治器Power arm 150g牵引力整体内收上前牙③矫治器加力+尖牙Power arm 150g牵引力整体内收上前牙三种工况下上颌前后牙的初始位移和最大牙周膜等效应力。结果:矢状向上,上中切牙的冠根位移差分别为1.29E-01mm、1.29E-01mm、1.33E-01mm,第一磨牙牙冠近移量分别为-2.33E-02mm、-2.35E-02mm、-2.68E-02mm;上中切牙和第一磨牙的最大牙周膜等效应力分别为4.84E-02 MPa、7.26E-02 MPa、4.00E-02Mpa,5.33E-03Mpa、1.05E-02Mpa、5.78E-03Mpa。结论:尚不能证实在150g牵引力作用下,高于牙槽嵴顶5mm的微种植钉与尖牙或矫治器上6mm高Power arm牵引能够较直接在尖牙上牵引更有利于前牙的整体移动、后牙支抗保护和最大牙周膜应力的减小。

    Abstract:

    Objective: Study of the biomechanical effect on power arm for en-masse retraction of anterior teeth using clear aligner and mini-screw, providing reference for clinical application. Method: Building the 3-D mode of power arm, which is 6mm high, was attached to the canine or appliance. To analysis the initial displacement and the maximal periodontal ligament vonmises stress of the teeth in three loading conditions, the force was loaded by ①clear aligner+150g force of retraction at canine②clear aligner+150g force of retraction at power arm at appliance③clear aligner+150g force of retraction at power arm at canine. Result:In sagittal direction, the crown and root displacement difference of maxillary central incisor is 1.29E-01mm, 1.29E-01mm, 1.33E-01mm,respectively. The crown displacement of the maxillary first molar is -2.33E-02mm, -2.35E-02mm, -2.68E-02mm, respectively. The maximal periodontal ligament vonmises stress of the central incisor is 4.84E-02 MPa,7.26E-02 MPa,4.00E-02Mpa respectively and the first molar′s is 5.33E-03Mpa,1.05E-02Mpa,5.78E-03Mpa respectively. Conclusion: It can not be testified that retracting on the 6mm high Power arm at canine or appliance with 5mm high mini-screw has more advantage than on the canine directly for controlling the torque of incisors , saving anchorage of posterior teeth and decreasing the periodontal ligament vonmises stress.

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  • 收稿日期:2019-10-24
  • 最后修改日期:2019-12-29
  • 录用日期:2019-12-31
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