口外弓推磨牙远移矫治安氏Ⅱ类错12例临床分析

目的　研究口外弓推上颌磨牙远移矫治安氏Ⅱ类错牙合后的组织变化。方法　用口外弓推磨牙远移治疗 12例安氏Ⅱ类错牙合。通过治疗前后X线测量及模型测量进行分析比较。结果　磨牙关系均被纠正至安氏Ⅰ类关系。结论　口外弓推磨牙远移配合方丝弓矫治器是矫治安氏Ⅱ类错牙合简便有效的方法之一     

口外弓推磨牙远移矫治安氏Ⅱ类错牙合12例临床分析

目的　研究口外弓推上颌磨牙远移矫治安氏Ⅱ类错牙合后的组织变化。方法　用口外弓推磨牙远移治疗 12例安氏Ⅱ类错牙合。通过治疗前后X线测量及模型测量进行分析比较。结果　磨牙关系均被纠正至安氏Ⅰ类关系。结论　口外弓推磨牙远移配合方丝弓矫治器是矫治安氏Ⅱ类错牙合简便有效的方法之一     

滑动杆与口外弓联合治疗安氏ⅡS错(牙合)畸形的X线头影测量分析

目的 研究口外弓结合滑动杆推上颌第一磨牙远移矫治安氏Ⅱ类亚类错(牙合)畸形磨牙远移的变化。方法 10例患者进行推上颌第一磨牙远移治疗前、后的X线头影对比研究。平均治疗101天,其测量值作统计学t检验。结果 磨牙均被纠正为安氏Ⅰ类关系。上颌磨牙平均远移3.78±2.02mm(P<0.01),同时伴有上颌磨牙的远中倾斜,平均3.2°±1.4°;下颌磨牙平均近移0.99±0.63mm(P<0.01)。给论 纠正磨牙关系为Ⅰ类关系有赖于一定比率的下颌磨牙近移。SNA角、SNB角、Y轴和PP/MP角的相对稳定,对颌骨无影响。     

口外弓结合滑动杆推单侧上颌磨牙的X线头影分析

安氏Ⅱ类错畸形伴有前牙轻度拥挤病例的非拔牙矫治 ,通过推上颌磨牙远移纠正磨牙关系 ,开展牙间隙已逐渐成为一种重要手段。本研究目的是探讨口外弓结合滑动杆推单侧上颌磨牙远移的效果 ,通过其治疗前后的Ｘ线头影侧位定位片的分析 ,评价其矢状 ,垂直方向的变化。一、材料与方法研究采用随机抽样的方法 ,治疗 10例患者 ,女性 7例 ,男性 3例 ,平均年龄 15岁 11月 (± 1岁 1月 ) ,均为安氏Ⅱ类磨牙关系 ,上颌第二磨牙 5例完全萌出、3例部分萌出、2例拔除 ,下颌位基本正常。1 矫治器的设计和施力　常规装配方丝弓矫治器 ,推磨牙远移时使用Φ0…     

口外弓单侧推磨牙向远中矫治安氏II类亚类错[牙合]临床报告

目的：探讨采用口外弓单侧推磨牙向远中矫治安氏II类亚类错[牙合]的临床效果。方法：选择恒牙列早期安氏II类亚类错[牙合]病例15例。年龄9一12岁,上颌第二磨牙尚未萌出,头影测量大致正常。取成品对称口外弓,在II类磨牙关系一侧,在口外弓的内弓套入螺旋推簧,施加200g力推磨牙远移。I类咬合关系一侧,将内弓弯成U形,起到平衡作用。为防止磨牙移动,整排牙列连续结扎。结果：推磨牙远移的时间4—7个月,平均5．5个月。磨牙远移距离3．5mm-6．0mm,平均远移4．4mm（UP0．8mm／每月）。磨牙远移结束后,II类磨牙关系改变成I类咬合关系,原来I类关系侧基本不变。磨牙远移到位后,再装配直丝弓矫治器完成矫治。结论：口外弓配合螺簧单侧推磨牙向远中,可顺利完成对安氏II类亚类错[牙合]的矫治,疗效满意。     

改良摆式矫治器联合口外弓矫治安氏Ⅱ1错（牙合）19例报告

目的:探讨改良摆式矫治器联合口外弓矫治安氏Ⅱ1错牙合的临床疗效.方法:应用改良摆式矫治器及口外弓对19例平均年龄13.4岁,第二磨牙已萌出的牙性安氏Ⅱ1错牙合进行治疗,进行矫治前后X线头影测量分析.结果:改良摆式矫治器联合口外弓,能同时推第一、第二磨牙向远中移动,直至磨牙为Ⅰ类或偏近中关系,上颌磨牙平均每月向远中移动1.3 mm.并能同步打开咬合,导下颌向前.结论:改良摆式矫治器联合口外弓矫治牙性Ⅱ1错牙合是一种较好的方法.     

改良摆式矫治器联合口外弓矫治安氏Ⅱ~1错19例报告

目的 :探讨改良摆式矫治器联合口外弓矫治安氏Ⅱ1错牙合的临床疗效。方法 :应用改良摆式矫治器及口外弓对 19例平均年龄 13 .4岁 ,第二磨牙已萌出的牙性安氏Ⅱ1错牙合进行治疗 ,进行矫治前后X线头影测量分析。结果 :改良摆式矫治器联合口外弓 ,能同时推第一、第二磨牙向远中移动 ,直至磨牙为Ⅰ类或偏近中关系 ,上颌磨牙平均每月向远中移动 1.3mm。并能同步打开咬合 ,导下颌向前。结论 :改良摆式矫治器联合口外弓矫治牙性Ⅱ1错牙合是一种较好的方法。     

口外弓推磨牙远移矫治安氏Ⅱ类错殆12例临床分析

目的 研究口外弓推上颌磨牙远移矫治安氏Ⅱ类错殆后的组织变化。方法 用口外弓推磨牙远移治疗12例安氏Ⅱ类错he。通过治疗前后X线测量及模型测量进行分析比较。结果 磨牙关系均被纠正至安氏Ⅰ类关系。结论 口外弓推磨牙远移配合方丝弓矫治器是矫治安氏Ⅱ类错he简便有效的方法之一。     

腭侧螺旋推簧配合口外弓推磨牙向后的临床研究

目的：探讨腭侧螺旋推簧配合口外弓矫正器推磨牙向后的临床应用。方法：选择安氏Ⅱ类错He病例30例，采用腭侧螺旋推簧配合口外弓矫正器推磨牙向后，通过头影测量和模型分析，记录上颌切牙、磨牙向后移动的距离，有牙覆盖，双尖牙区和磨牙区宽度的变化。结果：上切牙腭向移位3．2mm，磨牙向后移动4．2mm，覆盖减小2．9mm，双尖牙区增宽1．4mm，磨牙区增宽1．6mm。结论：腭侧螺旋推簧配合口外弓矫正器能有效的远中移动上颌磨牙。     

螺簧多用弓装置矫治安氏Ⅱ2错

目的探讨采用一种新式矫治装置矫治安氏Ⅱ2错(牙合)的临床效果.方法选自第四军医大学口腔医院正畸科门诊安氏Ⅱ2病例20例(其中男9例,女11例),平均年龄12.6岁(10～～15.8岁).矫治装置使用多用弓 唇弓,在其上套入Ni-Ti推簧,并焊上拉钩,借助Ⅱ类牵引的力值(150g～200g),推上颌磨牙向远中移动,并适当牵引下颌后牙向近中移动,最终调整磨牙关系由Ⅱ类成为Ⅰ类.术前术后摄头颅侧位x线片,测量上下磨牙的远中、近中位移.结果经过平均4.5个月的治疗(3.4～5.8个月),上颌磨牙平均远移2.16±1.3 mm,而下颌磨牙平均向近中移动1.38±0.64 mm.最终磨牙的Ⅱ类咬合关系得到纠正.结论NiTi螺旋弹簧多用弓装置是一种有效的改正Ⅱ类磨牙关系的治疗方法,其矫治机制是在上颌磨牙远移的基础上,下颌磨牙适当近移共同作用的结果.     

Reliability of a facebow transfer procedure.

The three-dimensional orientation of a maxillary cast mounting from a simulated-kinematic facebow transfer was evaluated in multiple trials among three operators on a single subject. The anterior and posterior anatomic facial reference points were marked on the subject. Each operator performed a separate series of trials to reset the anterior facebow component, the two posterior facebow components, and a control series with no resetting of any facebow components relative to the subject. The x, y, and z coordinates of three reference points on the maxillary cast were determined with a machinist microscope relative to a fixed reference after each facebow transfer. A range of differences between mountings of the maxillary cast were found between trials with all three methods used. These mounting errors were due to setting of the instrument and would be expected in routine clinical use of this instrument.     

Virtual facebow technique using standardized background images

The procedure described provides a novel and accessible virtual facebow transfer based on standardized photographs loaded in the virtual articulator module of a computer-assisted design and computer-assisted manufacturing (CAD-CAM) software program for dental applications. The practical application of the technique in a digital workflow is the correct alignment of the digital maxillary cast to the virtual articulator with respect to the patient’s planes and the skin markings of the condylar axis.     

头帽口外弓在高角型拥挤病例治疗中的应用

目的:评价头帽口外弓高位牵引配合直丝弓矫治技术对中重度牙列拥挤伴高角错牙合畸形的矫治效果。方法:选取18例牙列中重度拥挤伴高角的病人,减数拔除4个前磨牙,应用头帽口外弓高位牵引加强磨牙支抗,并控制磨牙高度,结合固定矫治器进行矫治。结果:18例病人牙列排齐,面型得到保持或有良好改善,磨牙和尖牙关系均达到中性,下颌平面角维持或减小。结论:头帽口外弓在中重度拥挤伴高角错牙合畸形矫治中可起到控制磨牙高度和加强磨牙支抗的作用。     

Recording sagittal condylar angles using a mandibular facebow

summary The aim of this study was to determine the average sagittal condylar inclination angles of dentate subjects using a mandibular facebow with pencil tracing styli, to relate these angles to values assigned to articulators, and to assess the repeatability accuracy of drawing a tangent to a traced curve. The right and left sagittal condylar inclination angles of 103 subjects were recorded using a mandibular facebow with pencil tracing styli which marked a graph card during protrusive excursions. Tangents to the tracings were measured with a protractor allowing assessment of reproducibility. The mean left and right sagittal condylar inclination angles were 32° and 31.5°, respectively, with no significant differences ( P =0.609). Individual right and left measurements within each group showed significant differences ( P = 0.0000). The mean of the tangents drawn through three sagittal condylar angle tracings by 10 operators was 33.3°, and the mean of 10 tangents drawn through the same three tracings by one of the authors was 32.9°, with no significant difference ( P = 0.634). The average sagittal condylar inclination angles found in this study are in agreement with those reported in the literature. In fixed sagittal condylar angle articulators 30° appear to be an appropriate setting. The reproducibility of this method of recording sagittal condylar inclination angles was found to be accurate for the individual operator and between operators.