应用微型种植体支抗压低伸长磨牙的临床研究

目的研究微型种植体作为正畸支抗在压低伸长磨牙中的有效性。方法选择9例需要压低磨牙的患者,使用微型种植体作支抗压低伸长磨牙,治疗前后拍摄头颅侧位定位片,测量比较磨牙在矫治前后的压低量。结果所有患者的伸长磨牙均获得了有效压低,平均压低（2．7±0．7）mm,压低时间平均（4．1±2.3）个月,压低后的磨牙颊舌向转矩正常。结论应用种植体作支抗能有效地压低磨牙。     

微型种植体作支抗压低伸长磨牙的临床应用

目的:探讨使用微型种植体支抗压低伸长磨牙的临床应用。方法:选择10例需要压低磨牙的患者,共10颗。结果:所有患者的伸长磨牙均有效压低至牙牙合面。结论:应用种植体作支抗能有效压低磨牙为以后的修复提供机会。     

正畸微种植体支抗压低上颌磨牙的应用研究

目的: 探讨微种植体支抗压低上颌伸长磨牙的临床效果。方法: 选择30 例因下颌磨牙早失导致上
颌磨牙伸长的病例，其中男性17 例，女性13 例。于伸长磨牙颊舌侧分别植入1 枚微种植体支抗，共计80 枚，即
刻负载进行压低。对治疗前后变化结果进行统计分析，并观察临床效果。结果: 40 颗伸长磨牙均有效压低，平
均压低3．75±1．41mm，压低时间平均为6．7±0．3mo，临床效果良好。结论: 微种植体支抗压低伸长磨牙临床效果显
著，在临床中具有极高的应用价值。     

微螺钉种植体支抗压低上颌伸长磨牙的疗效观察

目的:探讨利用微螺钉种植体支抗压低上颌伸长磨牙的效果。方法:利用微螺钉种植体作为支抗压低10例成年患者的12颗伸长上颌磨牙。分别在患牙颊侧近中、远中及腭侧骨板各植入1枚自攻微螺钉种植体,即刻负载0.981~1.962 N,通过X线头影测量、模型分析比较矫治前后相关参数的变化情况。结果:12颗磨牙均得到了有效的压低,压低(2.7±1.2)mm,压低时间(6.5±3.2)个月。与矫治前比较,U6-PP、U7-PP明显降低(t=9.659,7.730,P<0.001),而U6-RL、U7-RL、U6-PP角和U7-PP角的变化差异均无统计学意义(P>0.05)。模型测量指标L、W和H治疗前后差异无统计学意义(P>0.05)。结论:微螺钉种植体支抗能有效地压低磨牙,为磨牙伸长的修复前矫治提供了可靠的方法。     

利用微型种植体支抗压低下颌磨牙的临床研究

目的研究安氏Ⅰ类错患者中,采用微型种植体作支抗,压低下颌磨牙的临床效果及其作用特点。方法选择12例成人患者,将24枚微型种植体植于下颌第一磨牙近、远中的颊侧牙槽骨内,Ni-Ti螺旋弹簧拉长后分别连接于下颌第一磨牙带环颊侧,来压低下颌第一磨牙。测量磨牙的压低量、颊舌向的位置变化、近远中倾斜度以及磨牙移动的速度,并通过治疗前后的X线片对比以观察磨牙牙根有无吸收,牙周膜腔的变化情况。通过测量下颌第二磨牙与下颌中切牙的位置变化来衡量支抗强弱。结果下颌第一磨牙平均压低3.5mm,疗程5.2个月,平均移动速度0.67mm/月;磨牙牙冠近颊尖、远颊尖分别颊向移动1.2mm、1.3mm。磨牙牙根没有吸收,牙周膜腔宽度没有改变。下颌第二磨牙与下颌中切牙的位置没有改变。结论所有下颌磨牙均被压低到了恰当的位置,为对颌牙的修复治疗提供了足够的间隙。同时该方法临床操作简单易行,适于推广。     

种植体支抗压低过长磨牙的临床应用

近年来随着牙齿正畸治疗方法的普及,尤其是成人患者的增加,各种特殊问题的处理不断增加。例如牙周病;磨牙正锁颌,下后牙严重舌倾;磨牙缺失;对颌缺失,磨牙伸长等。其中以长期牙缺失未修复,对颌牙伸长导致间隙不足,使义齿修复困难者多见。对于此类错颌,传统的压入伸长牙的方法有     

正畸微型种植体支抗的临床应用研究

正畸治疗是对牙齿或颌骨施力，并使之达到预期位置的过程。这一力量的反作用力必须由一稳定的装置来承担，即所谓“正畸支抗”的概念。Pmffit定义正畸支抗为“对不希望发生的牙齿移动的抵抗”。正畸支抗的正确设计和合理使用是决定矫治成功的关键因素之一，通常由口内的牙（组牙）或口外的装置来实现。传统加强支抗的方法如横腭杆、Nance弓、固定舌弓、唇挡、颌间牵引、头帽口外弓等，存在不易控制、舒适性较差或依赖患者合作等不足，一定程度上影响了矫治效果。     

微种植体支抗压低上颌伸长磨牙的临床研究

目的：研究微种植体支抗在磨牙压低中的临床疗效.方法：24颗伸长的磨牙颊舌侧各植入一枚微种植体,挂橡皮链进行轻力压低.结果：以与相邻前后牙的邻面接触情况为评价标准,24颗磨牙压低成功19颗,压低有效3颗,压低不良2颗,成功率为79％,有效率为13％.本研究中均采用轻力压低磨牙,牙根均未发现有吸收.51颗微种植体,47颗成功,4颗失败.结论：微种植体做为一种简便有效的新型支抗,能够提供绝对支抗,使磨牙压低能够达到理想的效果,解决了临床中磨牙难以压低的难题.     

微型种植体支抗在正畸临床的应用进展

支抗控制是口腔正畸治疗过程中的关键问题，稳定而有效的支抗设计是正畸和颌面矫形治疗成功的基础。在传统的治疗方案中常用的支抗控制手段有口外弓、颌间牵引、Nace弓、横腭杆及一组牙作为支抗移动单个牙齿等。这些方法需要患者良好的配合，支抗效果有时难以保证。因此，若发生支抗设计失误、控制不当，难以避免后牙的前移。近年来，种植体支抗在口腔正畸临床的应用已成为口腔正畸领域的研究热点。     

微型种植体支抗在口腔正畸中的应用

<正>支抗控制是口腔正畸中的关键,传统的支抗手段有口外弓,颌间牵引,横腭杆,Nance弓,唇挡,舌弓以及组牙作支抗移动单个牙齿等,这些方法需要患者配合,支抗效果难以保证,在治疗过程中难免后牙的前移,特别是对于那些需要超强支抗的病例难以满足其对支抗控制的要求。     

微种植体支抗与传统支抗治疗正畸的临床效果比较

目的比较微种植体支抗与传统支抗在正畸中的差异。方法将132例错殆畸形患者分为微种植体支抗组和传统支抗组。观察两组干预措施前后的变化及不良反应。结果微种植体支抗组上颌切牙切缘分别内收4．88mm和4．31mm．磨牙平均前移1．14mm：传统支抗组上颌切牙切缘分别内收3．48mm和3．24mm,磨牙平均前移2．43mm。相对RL线,两组治疗后U1-NA（mm）、L1-NB（mm）、U1-APg和U6-PtPNS比较,差异有统计学意义（t分别为6．76、5．34、5．09、10．22,P均〈0．05）。随访6个月,微种植体支抗组患者的微种植体周围软组织轻度水肿。无感染现象发生,患者无明显不适感;传统支抗组出现4例支抗牙伸长、松动、牙龈红肿。结论微种植体支抗能达到临床强支抗要求,微种植体支抗能够更大程度改善患者前牙覆殆覆盖关系,正畸效果显著。     

Intrusion of overerupted maxillary molars with miniscrew implant anchorage: A radiographic evaluation

The aim of this retrospective study was to quantitatively evaluate the treatment effects of in- trusion of overerupted maxillary molars using miniscrew implant anchorage and to investigate the apical root resorption after molar intrusion. The subjects included 30 patients whose average ages were 35.5±9.0 years. All patients had received intrusion treatments for overerupted maxillary molars with miniscrew anchorage. There were 38 maxillary first molars and 26 maxillary second molars to be in- truded. Two miniscrews were inserted in the buccal and palatal alveolar bone mesial to the overerupted molar. Force of 100-150 g was applied by the elastic chains between screw head and attachment on each side. Lateral cephalograms and panoramic radiographs taken before and after intrusion were used to evaluate dental changes and root resorption of molars. Only 6 of the 128 miniscrews failed. The first and second molars were significantly intruded by averages of 3.4 mm and 3.1 mm respectively （P〈0.001）. The average intrusion time was more than 6 months. The crown of the molars mesially tilted by averages of 3.1 degrees and 3.3 degrees （P〈0.001） for first and second molars. The amounts of root resorption were 0.2-0.4 mm on average. The intrusion treatment of overerupted molars with miniscrew anchorages could be used as an efficient and reliable method to recover lost restoration space for pros- thesis. Radiographically speaking, root resorption of molars was not clinically significant after applica- tion of intrusive forces of 200 to 300 g.     

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.     

Bacteriological evaluation for one-and two-piece implant design supporting mandibular overdenture

Background:

This study evaluated and compared the bacteriological effect of two-piece implants and one-piece implants in complete overdenture cases on supporting structures.

Materials and Methods:

Ten male completely edentulous patients were selected and randomly divided into two equal groups according to the implant design and surgical technique for this study; Group 1: Patients were rehabilitated with complete mandibular overdenture supported by two-piece implants one on each side of the lower arch following two-stage surgical technique and Group 2: Patients were rehabilitated with complete mandibular overdenture supported by one-piece implants one on each side. Evaluation was made at the time of insertion, 6, 12, and 18 months after overdenture insertion, by measuring bacteriological changes around implants abutments.

Results:

Complete overdenture supported by one-piece implants showed better effect on the bacteriological changes as compared to that supported by two-piece implants.

Conclusion:

Complete overdenture supported by one-piece implants one on each side of the lower arch showed better effect on the bacteriological changes than using the same prosthesis supported by two-piece implants.     

微型种植体支抗在口腔正畸中的应用

目的：探讨微型种植体支抗在口腔正畸中的临床应用及疗效。方法：回顾性分析2008年6月～009年6月正畸治疗的患者65例,试验组34例选用微型种植体作为支抗进行治疗,对照组31例选用腭杆加口外弓支抗进行治疗,将两组进行比较。结果：经过13个月的治疗,两种支抗控制均能获得有效的临床效果,但是微型种植体支抗能够使效果更完美。...     

微型种植体支抗在口腔正畸治疗中的应用价值

目的:探讨微型种植体支抗在口腔正畸治疗中的临床价值.方法:选择我院2010年3月～2013年3月间收治的口腔畸形患者40例作为研究对象,按照数字随机法分为两组,每组20例.对照组采用常规治疗模式,观察组采用微型种植体支抗治疗模式,对比两组患者的治疗效果、不良反应发生率、咀嚼功能以及龈沟液中细胞因子含量.结果:(1)观察组磨牙移位、上中切牙倾角差、上中切牙凸距差分别为(4.0±0.3)mm、(30±8)°、(4.4±1.7)mm,与对照组比较差异有统计学意义(P＜0.05);(2)观察组出现口腔炎症1例(5.0％),无软组织水肿、术后不舒适感,不良反应发生率5.0％,明显低于对照组(P＜0.05);(3)观察组患者的咀嚼效率和咬合力高于对照组(P＜0.05);(4)观察组患者龈沟液中细胞间黏附分子1(CAM1)、基质金属蛋白酶(MMP2)、一氧化氮(NO)、白介素-1β(IL-1β)含量均低于对照组(P＜0.05).结论:微型种植体支抗对口腔畸形治疗具有重要价值,术后不良反应少、咀嚼功能恢复理想,应用安全.     

微种植体支抗施力的时机与稳定性的关系

目的：通过动物实验探讨微种植体支抗施力的时机与微种植体支抗稳定性的关系,为微种植体支抗在临床应用提供理论依据。方法：选择犬3只,设为未加力组、即刻加力组与非即刻加力组。全麻条件下将钛微种植体植入实验动物狗的双侧上颌尖牙、磨牙区与下颌磨牙区,所施力值0.2 N。8周处死动物,X线拍片进行影像学评价;通过HE染色与GOMORI特殊染色方法进行组织学评价。结果：X线结果显示磨牙区植入的微种植体较尖牙区更多骨结合。HE染色显示实验8周时即刻加力组可观察到微种植体周围骨边缘整齐的成熟的层状骨,可见到大量成纤维细胞;非即刻加力组微种植体周围为高矿化的层状骨组织,可见较多的骨陷窝,内有骨细胞,钙化程度与旧骨组织接近。GOMORI特殊染色显示即刻加力组微种植体周围有较多未矿化结缔组织,非即刻加力组微种植体周围有明显矿化骨组织出现。结论：非即刻加力组较即刻加力组的微种植体有更多的骨性结合,可更好地提供稳定的正畸支抗。     

单侧种植微螺钉支抗体矫治上颌前牙中线偏斜的临床研究

目的研究单侧植入微螺钉支抗体矫治上颌中线偏斜的临床效果。方法选择16例上颌中线偏斜3～5 mm的正畸患者,植入一颗或两颗微螺钉作为支抗,微螺钉植入部位为非中线偏移侧的第一磨牙近中颊侧(需要强支抗的也可在两侧上颌第一磨牙近中植入);非偏移侧用拉簧或链状橡皮圈牵引尖牙、侧切牙,牵引力约100～150 g;偏移侧放置推簧在侧切牙和尖牙之间。结果 16例患者上颌中线都能调整到与面部中线一致,牙弓对称性明显改善,未出现切牙唇倾和上颌平面偏斜情况。调整时间平均4个月。结论利用单侧微螺钉牵引前牙,能有效地矫治上颌中线偏斜。