微种植体支抗联合自制式滑动杆单侧推磨牙向后的临床应用

目的：探讨运用微种植体支抗联合自制式滑动杆单侧推磨牙向后的应用要点。方法：选择安氏Ⅱ类亚类错牙合7例(男2例,女5例),年龄15～30岁,平均18.7岁。轻中度拥挤,拥挤度平均4～5mm,或伴上中线偏移,或侧貌较突者。采用单侧植入微种植体支抗钉联合自制式滑动杆推磨牙向后,恢复上下磨牙的中性关系,保持上颌磨牙两侧对称,推力250g。疗程3～5个月,平均4个月。通过临床评价和矫治前后的照片和模型分析其治疗的有效性。结果：7例患者有效地应用微种植体支抗联合自制式滑动杆单侧推磨牙向后,矫正了单侧磨牙Ⅱ类远中关系、轻中度拥挤、中线偏移或恢复上颌磨牙两侧对称,取得较好的临床疗效。远移侧上颌第一磨牙远中平均移动4.2mm,平均移动速度1.05mm/月。结论：微种植体支抗联合自制式滑动杆单侧推磨牙向后,发挥了绝对强支抗作用,有效地远中移动上颌磨牙,容易取得患者配合,取材容易制作简便,有临床推广价值。     

VA07型空压机曲轴配重机械加工工艺及其工装夹具设计

本文介绍了该工装夹具在工厂中的实际应用及取得的效率以及今后如何推广,弥补了以往加工曲轴配重在精度方面往往达不到要求的一些不足之处,提出了一种新的配重加工处理方法。     

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目的研究Sliding jig配合颌间牵引远移磨牙的治疗效果。方法选择2005-2006年于中国医科大学口腔医学院正畸科就诊的15例Ⅰ类骨骼关系或轻度骨性错畸形、无须拔牙矫治患者,其中安氏Ⅱ类畸形7例、Ⅲ类畸形8例,分别行Sliding jig配合安氏Ⅱ类、Ⅲ类颌间牵引推磨牙向后,并与单纯牵引患者进行对比,通过头影测量确定磨牙的移动量,分析Sliding jig治疗产生的牙齿及骨骼效应。结果Sliding jig配合颌间牵引能达到安氏Ⅰ类关系,磨牙远移(3.14±1.07)mm;单纯颌间牵引磨牙远移(0.91±0.55)mm,两组比较差异有统计学意义(P<0.01)。头影测量结果比较,骨骼改变无明显差异。结论Sliding jig与颌间牵引等方法的联合应用可有效地将磨牙向远中移动,加快磨牙关系的调整。     

Facilitating rotationplasty

Rotationplasty, a unique surgical procedure where the ankle is converted into the knee joint after shortening and 180 degree external rotation of the limb is a well accepted alternative to amputation in musculoskeletal oncology.The required vascular dissection can be quite difficult as the concerned vessels lie in the posterior compartment from the distal third of the thigh downwards. The problem is compounded when rotationplasty is used as a salvage procedure after failed limb-sparing tumor surgery because of the additional fibrosis and stiffness at the level of the prosthetic knee joint. We advocate making the femoral osteotomy at an early stage in the procedure so as to allow free rotation of the distal limb thus making the popliteal fossa and the limb distal to it face anteriorly to facilitate the neuro vascular dissection. We also describe use of a novel cutting jig to ensure a perfect horizontal cut perpendicular to the long axis of the bone while making the femoral and tibial osteotomies. This ensures maximal surface contact between the apposing femoral and tibial cut ends, promoting early bony union.     

The 3D-printed miniplate-jig system: a new,rapid, precise,and user-friendly approach to miniplate fixation of free-tissue mandibular reconstructions

Patient-specific, additively manufactured (printed) titanium reconstruction plates have been widely used to improve accuracy and efficiency of fibular flap reconstruction of the mandible. Miniplates possess some potential advantages over single-piece reconstruction plates, however multiple-miniplate fixation can be more technically demanding and may lengthen the duration of surgery. Furthermore, incremental angulation errors in screw placement for each miniplate could compromise overall dimensional accuracy of the neomandibular reconstruction. This preliminary article reports the first clinical use of a new patient-specific, printed titanium miniplate-jig system in a patient undergoing hemimandibulectomy for osteoradionecrosis of the mandible with fibular flap reconstruction. Our initial experience with the new device and technique demonstrates a quick, user friendly, and precise method for the placement and fixation of multiple miniplates in fibular-flap reconstruction of the mandible.     

微种植体支抗钉结合改良滑动杆近中移动 上颌前磨牙的临床应用

目的 探讨微种植体支抗钉结合改良滑动杆近中移动上颌前磨牙关闭缺牙间隙的可行性及有效性。方法 选取上颌侧切牙或尖牙缺失的患者5例（男2例,女3例）,年龄14~25岁。缺失侧磨牙关系均为安氏Ⅱ类。在上颌第二前磨牙及第一磨牙间植入微种植体支抗钉,结合改良滑动杆近中移动前磨牙。前磨牙移动到位后更换支抗钉位置,利用支抗钉拉磨牙近中移动,关闭剩余间隙。前磨牙移动疗程6~10个月。通过矫治前后石膏模型测量前磨牙近中移动有效性。结果 5例患者均得到有效治疗,上颌前磨牙及磨牙近中移动,缺牙间隙关闭,缺牙侧磨牙关系完全远中,治疗效果均令人满意。上颌前磨牙近中平均移动4.1 mm,平均移动速度0.96 mm/月。结论 对于上颌侧切牙或尖牙缺失的患者,微种植体支抗钉结合改良滑动杆可简单高效实现前磨牙近中移动,并最终关闭缺牙间隙,临床上可作为一种备选治疗方案。     

A Navigated 8-in-1 Femoral Cutting Guide for Total Knee Arthroplasty : Technical Development and Cadaveric Evaluation

The goals of this study were to determine the precision of femoral component placement using a novel computes assisted surgery (CAS)-enabled 8-in-1 cutting guide in cadaver limbs and to identify errors generated at various stages of the cutting process. The cutting guide placement was on average within 1° or millimeter of the target position in the varus/valgus, axial rotation, and cut height directions and within 2° or millimeters, in all other directions. The difference between the desired femoral component and the impacted trial component position, defined as the execution error, averaged 0.9° ± 1.7° of varus rotation, 0.8 ± 2.3 mm of lateral translation, and 0.3 ± 1 mm of proximal translation in the coronal plane (±SD). In the sagittal and axial planes, the execution error averaged 2.8° ± 2.5° of flexion, 3.4 ± 1.3 mm of anterior translation, and 0.7° ± 2.7° of external rotation. CAS permits accurate placement of 8-in-1 jigs for valgus/varus, axial rotation, and cut height but is less accurate in the sagittal plane. Care should be taken when executing the cuts, which can affect precision in the sagittal plane more than actual positioning of the jig.     

A simple jig allows for a rapid mounting of micropipette tips for EM viewing

A simple jig to be used with a microscope allows rapid mounting of micropipette tips on electron microscope grids.     

推簧法在尖牙远移中的一种运用

目的分析一种使用交互力远移尖牙的力系。方法（1）游离弓丝实验及力学分析；（2）选择20例经拔除4个第一前磨牙的恒牙期患者，采用镍钛推簧加滑杆的矫治装置，方丝弓矫治技术，使用镍钛螺旋推簧推上尖牙远中移动力150-250g。观察临床效果，并测量推尖牙前后的模型，记录尖牙远移到位时间。结果（1）以弓形图上颌弓为准，弓丝末端由B点外展至C点；（2）临床应用效果良好，时间2～6个月，平均4个月。结论设置滑杆推簧整体效果更明确，临床应用证明是一种高效的矫治系统，尤其适用于临床上支抗不足的患者。