摘要
目的探讨下颌扩弓结合固定矫治技术-制动力系统用于提高扩弓效率的可行性。方法选取10例青春发育高峰期中度拥挤伴有牙弓狭窄的安氏Ⅰ类直面型患者,均采用上、下颌扩弓结合固定矫治技术-制动力系统进行矫治。在4个矫治阶段[扩弓前(T0期)、扩弓加力结束即刻(T1期)、拆除扩弓器即刻(扩弓结束后6个月,T2期)、矫治结束后(T3期)]对患者拍摄锥形束CT(CBCT)片。应用CBCT片分别测量各个矫治阶段颊尖间距离、牙根尖距离、牙长轴与水平面的夹角、釉质牙骨质界点到牙槽嵴顶点的距离,观察牙齿位置变化及牙槽骨改建的情况。结果CBCT的测量结果显示:T0~T1期所有牙齿颊尖间距离均增加;T1~T3期颊尖间距离一直在减少(第一磨牙除外),第一磨牙颊尖间距离在T2~T3期增加。T0~T1期所有牙齿牙根尖间距离均减少,T1~T3期尖牙和第二前磨牙牙根尖间距离一直在增加,而第一前磨牙和第一磨牙牙根尖间距离在T2~T3期减小。颊尖间距离的变化小于牙根尖间距离的变化。T0~T1期所有牙齿牙长轴与水平面的夹角均增加,T1~T3期牙长轴与水平面的夹角逐渐减少(第一磨牙除外),第一磨牙夹角在T2~T3期有少量增加。T0~T1期所有牙齿釉质牙骨质界点到牙槽嵴顶点的距离均增加,T1~T3期釉质牙骨质界点到牙槽嵴顶点的距离逐渐减少,牙槽骨的高度在逐渐恢复。结论下颌扩弓结合固定矫治技术-制动力系统有望提高下颌扩弓效率。
Objective To explore the feasibility of mandibular expansion combined with fixed appliance-braking force system for improving the mandibular expansion efficiency.Methods The combination of maxillary and mandibular expansion with fixed appliance-braking force system was applied to correct 10 patients with Angle's classⅠmalocclusion with moderate crowding and maxillary constriction during the peak adolescent growth period.Cone beam computed tomography(CBCT)images were taken at four stages of treatment[pre-expansion(T0),immediately after expansion force removal(T1),immediately after expansion appliance removal(6 months post-expansion,T2),and post-treatment(T3)].CBCT images were used to measure the intermolar width,interapical width,included angle between tooth long axes and the horizontal plane,and the distance from the enamel-cementum junction to the alveolar crest,to observe changes in tooth position and alveolar bone remodeling.Results CBCT measurements showed that the intermolar width of all teeth increased at T0-T1;the intermolar width decreased at T1-T3(except for the first molar),and the intermolar width of the first molar increased at T2-T3;the interapical width of all teeth decreased at T0-T1,and the interapical width of the canines and the second premolar continued to increase at T1-T3,while the interapical width between the first premolar and the first molar decreased at T2-T3;the changes in intermolar width were less than those in interapical width.The included angle between the long axis of all teeth and the horizontal plane increased at T0-T1,and gradually decreased from T1 to T3(except for the first molar),and the included angle of the first molar had a small increase at T2-T3.The distance from the enamel-cementum junction to the alveolar crest increased in all teeth at T0-T1 and gradually decreased at T1-T3,and alveolar bone height gradually recovered.Conclusion Mandibular expansion combined with fixed appliance-braking force system holds promise for enhancing mandibular expansion efficiency.
作者
赵冰净
韩易辰
全梓锋
陆勇
张照明
高群
ZHAO Bing-jing;HAN Yi-chen;QUAN Zi-feng(Department of Orthodontics,the First Dongguan Affiliated Hospital of Guangdong Medical University,Dongguan 523710,China)
出处
《中国现代药物应用》
2024年第20期45-49,共5页
Chinese Journal of Modern Drug Application
基金
东莞市社会发展科技项目(项目编号:20231800904832)
大学生创新创业训练计划项目(项目编号:GDMU2022132)。
关键词
牙弓狭窄
安氏Ⅰ类错畸形
下颌扩弓
下颌扩弓结合固定矫治技术-制动力系统
下颌牙弓扩展效率
Narrow dental arch
Angle's classⅠmalocclusion
Mandibular expansion
Mandibular expansion combined with fixed appliance-braking force system
Mandibular expansion efficiency
