应用Typodont系统对比滑动法和双钥匙曲法关闭拔牙间隙的牙列变化  

Applying Typodont to compare the dentition changes in closing space of extractions between sliding straight wire technique and double keyhole loops

作　　者：韩迪 郭泾 HAN Di;GUO Jing(Department of Orthodontics,School and Hospital of Stomatology,Cheeloo College of Medicine,Shandong University,Jinan 250012,Shandong,China;Shandong Key Laboratory of Oral Tissue Regeneration,Jinan 250012,Shandong,China;Shandong Engineering Laboratory for Dental Materials and Tissue Regeneration,Jinan 250012,Shandong,China;Ningbo Stomatological Hospital Affiliated to Hangzhou Medical College,Ningbo 310001,Zhejiang,China)

机构地区：[1]山东大学齐鲁医学院口腔医学院·口腔医院正畸科,山东济南250012 [2]山东省口腔组织再生重点实验室,山东济南250012 [3]山东省口腔生物材料与组织再生工程实验室,山东济南250012 [4]杭州医学院附属宁波口腔医院,浙江宁波310001

出　　处：《山东大学学报（医学版）》2023年第11期48-58,共11页Journal of Shandong University:Health Sciences

摘　　要：目的利用电磁感应加热式Typodont结合扫描仪,观察关闭间隙时使用滑动法和双钥匙曲法牙列的三维变化,并探索在同一加力方式下,加载不同力值对牙列的影响。方法在拔除第一前磨牙的标准Typodont上颌模型上黏接托槽,滑动组采用滑动直丝弓技术关闭拔牙间隙,分为平弓组和摇椅组;双钥匙组采用双钥匙曲法关闭间隙,分为前倾组和后倾组。设置250 g和300 g两种加载力值。重叠初始和实验后数字模型,分析牙冠标志点三维位移变化。结果①矢状向上,平弓组在250 g力值下与摇椅组U1、前倾组U1、后倾组U3、U7差异有统计学意义(P<0.05);300 g力值下与摇椅组U7、后倾组U1~U6差异有统计学意义(P<0.05)。力值增加,各实验组的前牙后退量无明显增加;后牙前移量均相应增加,除摇椅组U6、后倾组U7外(P<0.05),其他后牙变化差异无统计学意义(P>0.05)。②在冠唇(颊)舌倾度上,平弓组前牙区冠舌倾程度大于摇椅组,力值增加两组冠舌倾程度均增加。两力值下,所有实验组仅前倾组前牙表现冠唇倾,后倾组前牙在250 g力值时接近整体后退。加载250 g时仅摇椅组后牙区冠舌倾,其他3组后牙均冠颊倾。300 g时滑动组的U5、U6牙冠舌倾,U7牙冠颊倾,双钥匙组后牙均冠颊倾。③垂直向上,平弓组在250 g力值时除U7牙压入外前后牙都伸长,300 g力值时后牙伸长量明显增加(U6、U7:P<0.05)。摇椅组在250 g力值时前后牙少量压入,300 g时前牙表现伸长而后牙压入减少。前倾组可明显压低前牙,少量伸长后牙,力值增加前牙压低量减少,后牙伸长量明显增加(P<0.05)。后倾组可明显压低后牙,少量伸长前牙,力值增加前后牙变化差异无统计学意义(P>0.05)。结论①预置摇椅可在一定程度上减少滑动法前牙冠舌倾程度、后牙前移及伸长量。双钥匙曲法预置后倾弯可获得较强的后牙支抗,预置前倾弯可获得较强的前牙支抗,前、后�Objective To observe the three⁃dimensional(3D)changes of the dentition between sliding straight wire technique and double keyhole loops with heat⁃induced Typodont system and scanner,and to explore the effects of loading forces on the dentition under the same methodology.Methods Brackets were bonded onto a standard Typodont maxillary model,with the first premolar extracted.The sliding technique group was divided into two subgroups:straight arch group and cruve arch group.The double keyhole group was also divided into two subgroups:tip⁃forward group and tip⁃back group.The initial and post⁃experiment digital models were overlapped,and 3D changes were analyzed using crown marker points.Results①Sagittal Changes:in the straight arch group,at 250 g force value,there was signifi⁃cant difference in U1 between the curve arch group and tip⁃forward group,and in U3 and U7 between tip⁃back group(P<0.05).At 300 g force value,only U7 in the curve arch group and U1-U6 in the tip⁃back group had statistical differences(P<0.05).When the force was increased,there was no significant increase in the anterior teeth retrusion,and the advancement of posterior teeth increased accordingly in all groups.However,there were no significant differ⁃ences between posterior tooth changes,except for U6 in the curve arch group and U7 in the tip⁃back group(P<0.05).②Crown inclination lip(cheek)tongue degree:the amount of anterior lingual displacement in the straight arch group was more significant than that in the curve arch group.Crown lingual displacement increased in both groups with in⁃creasing force.Under two force values,only the tip⁃forward group's anterior teeth showed lip inclination displacement.The tip⁃back group anterior teeth were close to overall movement at 250 g.Under 250 g at the posterior tooth region,only the curve arch group shifted to the inclination of crown tongue,while the remaining three groups showed buccal displacement.Under 300 g,U5 and U6 in the sliding technique group showed crown tongue inc

关 键 词：Typodont 关闭拔牙间隙 直丝弓滑动法 双钥匙曲法 三维方向变化 

分 类 号：R574[医药卫生—消化系统]