用磨牙作支柱拉尖牙向远中支柱情况的早期观察

选择６２例拔除第一双尖牙的样本，分为平弓丝组、带“Ｕ”型阻滞曲组、固定舌弓组，采用方丝弓细丝弓技术，以磨牙作支抗拉尖牙向远中移动，对支抗磨牙进行观察。为期４周的观察发现，平弓丝组、带“Ｕ”型阻滞曲组的支抗磨牙均有近中舌向扭转，第二双尖牙中央窝间距亦比治疗前减少；而固定舌弓组支抗磨牙未见有近中舌向扭转。作者认为：以磨牙为支抗移动尖牙时，应注意支抗控制。本文对力的使用及支抗失控的预防、处理问题进行了讨论。     

微型种植体支抗在正畸治疗双颌前突中切牙及磨牙位置变化的研究

目的：研究微型种植体支抗治疗双颌前突病例的，临床应用效果。方法：选择在沈阳市口腔医院正畸科就诊，符合纳入标准的双颌前突患者14例，随机分成2组，分别采用微型种植体与传统方法加强支抗，通过术前术后X线头影测量结果变化评价2种支抗方法的临床有效性。结果：2组患者在6～8个月后上下颌前牙内收均达到预定位置，实验组上下颌第一恒磨牙牙冠分别近中移动0、29mm和0．56mm，上下颌切牙切缘分别腭侧移动6．93mm和6．03mm；对照纽上下颌第一恒磨牙牙冠分别近中移动1．36mm和1．96mm，上下切牙切缘分别腭侧移动5．79mm和4．21mm。结论：微型种植体支抗完全可以代替传统支抗方法，满足正畸临床治疗双颌前突的需要，实现前牙最大程度的内收。     

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??Canted occlusal plane is the main feature of mandibular deviation. The causes of occlusal plane canting are very complicated and inconclusive. A large number of studies have shown that it is related to bite force??bite contact area??chewing movement and even head or neck position. CBCT is the best diagnostic method for assessing occlusal plane canting at present. Canted occlusal plane and mandibular deviation are mainly ipsilateral??and a small number reveals contralateral. It can also have adverse effects on temporomandibular joint and mastication??and it has been difficult to be corrected with non-surgical methods. Based on the existing literature??we summarized the canted occlusal plane features??adverse effects and the commonly used non-surgical treatment methods.     

Palatal orthodontic miniscrew insertion using a CAD-CAM surgical guide: description of a technique

The aim of this report was to describe a new computer-guided technique for a controlled site preparation and palatal orthodontic miniscrew insertion using a dedicated software. A surgical guide was designed after planning the appropriate insertion sites on three-dimensional images created by the fusion of cone-beam computed tomography (CBCT) and digital dental model images. Pre- and postoperative CBCT images were compared and the angular, coronal, and apical deviations between the planned and the placed miniscrews were calculated. The mean coronal and apical deviations were 1.38 mm (range: 3.48–0.15 mm; standard deviation (SD): 0.65) and 1.73 mm (range: 5.41–0.10 mm; SD: 1.03), respectively, while the mean angular deviation was 4.60° (range: 15.23–0.54°; SD: 2.54). The present surgical guide allows a controlled and accurate palatal miniscrew placement in three dimensions.     

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??Effective anchorage control is one of the key factors of successful orthodontic treatment. As the orthodontic anchorage devices??micro-implants have the advantages??such as achieving“absolute”anchorage control??simplifying implant operation process??being easy to remove??low cost and low compliance requirements. Therefore??micro-implants are favored by the vast number of orthodontic doctors. However??potential risks associated with the use of micro-implants include fracture?? being loose??falling off??adjacent tissue infection??subcutaneous emphysema and root injury. How to reduce the potential risks and improve the success rate of micro-implants have become the research focus of the scholars. For the further study of micro-implants and in order to provide the theoretical reference to clinical application??this review will make a summary mainly in following aspects??the materials of micro-implants??the methods of surface modification and the morphological characteristics of the micro-implants.     

Rate of intrusion of maxillary incisors in Class II Div 1 malocclusion using skeletal anchorage device and Connecticut intrusion arch

BackgroundNonsurgical correction of deep bite involves either extrusion of posterior teeth, intrusion of incisors, or combination of both. The introduction of skeletal anchorage device with microimplant provides near absolute anchorage without producing any untoward effects on anchor unit. Connecticut Intrusion Arch (CIA) provided an efficient system of intruding anterior segment without producing much adverse affects on anchor teeth.MethodsThe study comprised of 30 patients of Class II Div 1 malocclusion with overbite of >6 mm and required therapeutic extractions of all first premolars, randomly distributed into two groups. Group 1 was treated using orthodontic microimplants, while Group 2 treated with CIA. Lateral cephalograms were taken pre-intrusion (T1) and post-intrusion at the end of six months (T2).ResultsThe rate of intrusion was 0.51 and 0.34 mm/month for Group 1 and Group 2 respectively. The average amount of change in centroid point to PP distance and U1-SN angle was significantly higher in Group 1 compared to Group 2 (P < 0.001). The average amount of change in U6 to PP distance did not differ significantly between two study groups (P > 0.05).ConclusionThe amount of intrusion is significantly higher in SAD group. Although vertical molar positional change was higher in CIA group than the SAD group, it was not changed significantly in both treatment modalities. SAD group overall had better results and was easier in handling during intrusion.     

舌体对舌力介导器的静息压力分析

目的:探讨坐位静息状态下舌肌对不同矢状向和垂直向位置舌力介导器的压力,以初步探索舌力介导器作为一种支抗方式的效用范围. 方法:纳入19例个别正常牙合志愿者(男4名,女15名,年龄23~33岁) ,分别个体化制作舌力介导器,矢状向测量选取正中线上对应于第二前磨牙远中、第一磨牙远中和第二磨牙远中3个部位,垂直向测量以舌位记录为参考零点,分别测量-3 mm、0 mm和3 mm这3个高度对应于第一磨牙远中处的压力. 所用传感器型号为美国Honeywell公司生产的FSS1500NS,压力校验仪、监测仪以及分析软件由厦门福芯微电子科技有限公司设计制作. 志愿者取坐位,测量舌体处于自然放松状态时的静息压力. 使用Friedman test对矢状向及垂直向各组数据进行多样本比较的秩和检验,P<0. 05为差异有统计学意义. 结果:在垂直向上,随着舌力介导器高度增加,压力逐渐增大(P<0. 001),-3 mm、0 mm和3 mm高度的压力均值分别为105. 83 Pa、167. 75 Pa和254. 25 Pa. 在矢状向上,压力由近中至远中逐渐减小(P<0. 001),其均值分别为177. 64 Pa、126. 72 Pa和109. 37 Pa. 结论:舌肌在静息状态下对舌力介导器的压力随基托高度增加而增大,并且由近中至远中逐渐减小,但在实际应用时应综合考虑效果和舒适度,不宜过高和偏远中.     

微种植体支抗治疗成人骨性安氏Ⅱ类错殆的疗效评估

目的：探讨微种植体支抗治疗成人骨性安氏Ⅱ类错殆的临床效果。方法：回顾性分析我院2011年8月～2014年7月收治的85例成人骨性安氏Ⅱ类错殆患者,所有患者均应用微种植体支抗技术进行治疗,比较患者治疗前后的投影测评结果。结果：治疗后,患者面部美观情况显著改善,磨牙在水平向和垂直向均未发生明显移动,而 U1-SN、U1-NA 及 LS-EP 则比治疗前显著减小,U1-L1、U1-SN 比治疗前明显增大。结论：微螺钉种植体是一个疗效确切的成人骨性安氏Ⅱ类错殆治疗技术,具有良好的应用前景。