Beta角评价前牙反患者颌骨矢状关系的准确性分析

目的探讨Beta角判断替牙期与恒牙期前牙反[牙合]患者颅面矢状关系的可靠程度。方法应用X线头颅定位侧位片,比较替牙期与恒牙期前牙反[牙合]患者的Beta角、ANB角、Wits值和APDI指数的差异,并进行相关性和变异程度分析。结果替牙期与恒牙期前牙反[牙合]患者Beta角间差异有统计学意义（P〈0．05）;Beta角与ANB角、Wits值和APDI指数显著相关（P〈0．05）,但变异较ANB角和Wits值小,与APDI指数接近。结论Beta角可准确评价前牙反[牙合]患者的颌骨矢状关系。     

安氏Ⅱ类1分类错上下颌基骨前后关系诊断指标的可靠性评价

目的 评价反映安氏Ⅱ类1分类错上下颌基骨前后关系13项指标的可靠性。方法 安氏Ⅱ类1分类错患者120例，男60例，女60例，年龄20-28岁。拍摄自然头位（NHP）下的头颅定位侧位片。一金属链悬于头颅前方，其在胶片上的影像作为确定真性水平面（THP）的依据。X线头影测量项目包括ANB角、AB平面角、Wits值、AF-BF、AXB平面角、AB/SN4、AB/PP、AXD平面角、AD/SN、SGn/AB角、APDI角、FABA角、β角及A、B两点在THP上垂足间的距离（AB/HP）。计算各测量项目的相关系数；测量结果按最小相关系数指标分类法行聚类分析。所有测量结果用SPSS11.0统计软件进行分析。结果 相关分析表明各项指标除Wits值和SGn/AB角外多数呈高度相关性；聚类分析采用最小相关系数指标分类，结果按0.60水准分为5类。结论 在安氏Ⅱ类1分类错患者中，除Wits和SGn/AB外其他11项指标均可作为上下颌基骨前后关系的评价指标。AB/SN4能比较真实地反映上下颌骨的矢状关系；ANB角、AB平面角、β角、AF-BF、AXB平面角、FABA角、AB/PP、APDI角等指标具有相似的临床意义。     

ANB角与Wits值评价颌骨矢状不调的研究

目的分析X线头影测量参数ANB角与Wits值在评价安氏Ⅱ类错颌骨矢状位置不调中的差异。方法为84例青少年安氏Ⅱ类与40例安氏Ⅰ类错患者正畸治疗前拍摄X线头颅侧位片,选择与ANB角和Wits值相关的十项头影测量项目,将安氏Ⅱ类错患者分为两组后与安氏Ⅰ类错组进行单因素方差分析。结果ANB角与Wits值在评价安氏Ⅱ类错颌骨矢状位置不调时具有显著性差异;差值较大组,平面较陡,矢状不调更显严重。结论患者颌骨矢状不调较严重且平面较陡者,ANB角与Wits值差异较大,ANB角更能反映其真实性。     

安氏Ⅱ类1分类错(牙合)上下颌基骨前后关系诊断指标的可靠性评价

目的评价反映安氏Ⅱ类1分类错（牙合）上下颌基骨前后关系13项指标的可靠性。方法安氏Ⅱ类1分类错（牙合）患者120例,男60例,女60例,年龄20-28岁。拍摄自然头位（NHP）下的头颅定位侧位片。一金属链悬于头颅前方,其在胶片上的影像作为确定真性水平面（THP）的依据。X线头影测量项目包括ANB角、AB平面角、Wits值、AF—BF、AXB平面角、AB／SN4、AB／PP、AXD平面角、AD／SN、SGrdAB角、APDI角、FABA角、B角及A、B两点在THP上垂足间的距离（AB／HP）。计算各测量项目的相关系数：测量结果按最小相关系数指标分类法行聚类分析。所有测量结果用SPSS11．0统计软件进行分析。结果相关分析表明各项指标除Wits值和SGrdAB角外多数呈高度相关性：聚类分析采用最小相关系数指标分类,结果按0．60水准分为5类。结论在安氏Ⅱ类1分类错（牙合）患者中,除Wits和SG11／AB外其他11项指标均可作为上下颌基骨前后关系的评价指标。AB／SN。能比较真实地反映上下颌骨的矢状关系：ANB角、AB平面角、β角、AF—BF、AXB平面角、FABA角、AB／PP、APDI角等指标具有相似的临床意义。     

描述颌骨矢向关系的7个参数:青春期后的预测精确度和互换性

A-B平面角、颌凸角、ANB角、SN-AB角、Wits值、AF-BF距、APDI值等均可用于描述颌骨矢向关系,但确定最有价值的参数尚无原则可循。本文测量了44例正常(牙合)受试者(男性20例、女性24例)青春期前、后(男性分别在10 5/12岁和14 5/12岁;女性分     

ANB角与Wits值的关系

目的 揭示ANB角与Wits值的关系，探讨已知ANB能否准确预测Wits值，方法：研究选用100例（男女各50例）11－13岁Class I或Class II错He患者矫治前的头颅定位侧位片，患者均有较好骨生长型，I组：13例患者ANB小于等于1．5度，Wits值均为负：II组：61例5．8度大于ANB大于1．5度，Wits值或正或负；III组：26例ANB大于等于5．8度，Wits值均为正，借助计算机对各组进行统计分析。结果：分析发现无男女性别差异（P＞05），II组与III组ANB与Wits两值间有显著相关意义（P＜0．05），回归分析表明I组与II组有统计学意义（P＜0．05），我们在II组可以预测Wits值，准确率为21％，结论 ：尽管许多测量分析数据有统计学意义，但无显著的临床意义。     

055.描述颌骨矢向关系的7个参数:青春期后的预测精确度和互换性

[英]/Ishikawa H…∥Am J Orthod Dentofacial Orthop.-2000,117(6).-714～720 　　A-B平面角、颌凸角、ANB角、SN-AB角、Wits值、AF-BF距、APDI值等均可用于描述颌骨矢向关系,但确定最有价值的参数尚无原则可循. 　　 出版日期：2001年3月20日 请看PDF全文     

骨性Ⅲ类错牙合患者后退接触位的头影测量分析

目的:评价骨性Ⅲ类错牙合患者牙尖交错位与后退接触位的头影测量数据差异。方法:选择16例伴下颌有功能性移位的骨性Ⅲ类患者,(RCP位ANB<0°),测量分析治疗前ICP位与RCP位的头颅侧位片。使用SPSS17.0统计软件对数据进行统计分析。结果:在ICP位与RCP位,骨性指标SNB角、颌突角、FMA角、MP-SN角、Y轴角及N-per to Pog距离、ANB角、Wits值、APDI值、反覆盖、ODI值均有显著性统计学差异(P<0.001)。牙性指标U1-L1角(P<0.01),FMIA角(P<0.001)有统计学差异。软组织指标颏前点至零子午线距离(P<0.001),Z角(P<0.01)也有统计学差异。结论:对于存在功能性移位的骨性Ⅲ类患者,术前RCP位头颅侧位片分析对诊断错牙合严重程度和制定治疗方案有重要意义。     

153例错畸形患者W角的测量分析研究

目的:本研究使用一种新的头影测量方法-W角评价上下颌骨矢状向关系,据此分析安氏3种错类型W值。方法:对153例11～20岁患者头颅侧位片进行头影测量分析,按照ANB角、Wits值和β角分为3组,取平均值和标准差,分析男女差异。结果:分析安氏3种错类型患者W角的正常值;3组W值间差异有统计学意义(P<0.05);各组W值在性别上没有显著差异。结论:W角能反映上下颌骨矢状方向不调,具有较好可重复性。     

面部软硬组织矢状关系Wits值分析方法的相关研究

目的:探讨面部软硬组织Wits值分析方法在评价上下颌骨矢状关系中的相关性.方法:选用60例成人正常(牙合)头颅侧位片,其中男性30人,女性30人.采用相同的测量平面-(牙合)平面,分别测量硬组织、软组织Wits值,用SPSS软件包对两者间的相关性进行统计分析.结果:①硬组织Wits值与软组织Wits值具有高度相关性,相关系数0.746.②硬组织Wits值与软组织Wits值均无性别差异.③软组织Wits法的正常值为0.455±2.656.结论:临床可考虑用软组织A、B点替代硬组织A、B点进行面部矢状关系的测量.     

Seven parameters describing anteroposterior jaw relationships: Postpubertal prediction accuracy and interchangeability

Seven parameters describing anteroposterior jaw relationships (the A-B plane angle, the angle of convexity, the ANB angle, the SN-AB angle, the Wits appraisal, the AF-BF distance, the APDI) were measured on pairs of prepubertal and postpubertal cephalograms of 44 normal occlusion subjects (20 males and 24 females). The mean ages at prepubertal and postpubertal stages were 10 years 5 months and 14 years 5 months in males and 8 years 10 months and 12 years 10 months in females, respectively. The purpose of this study was to compare prediction accuracy of future relationships by regression analysis and to evaluate interchangeability among the 7 parameters by correlation analysis. In the prepubertal assessment, the ANB angle and the angle of convexity showed better prediction accuracy for postpubertal jaw relationships. Higher interchangeability among the parameters was statistically substantiated between the SN-AB angle and the AF-BF distance, as well as among the ANB angle, the angle of convexity, and the A-B plane angle. The Wits appraisal and the APDI were less interchangeable with other parameters. The ANB angle, the Wits appraisal, and the APDI would complement each other for the geometrically distorting factors because of the low interchangeability due to their different geometric basis. The conjunctive use of the ANB angle, the Wits appraisal, and the APDI is recommended as a clinically appropriate method for assessment of jaw relationships in individuals.     

A comparison of ANB, WITS, AF-BF, and APDI measurements

In the present study, the relationships among ANB, Wits, AF-BF, and APDI measurements used in the assessment of the anteroposterior jaw disorders were examined on the cephalometric radiographs of 63 male and 82 female subjects, and high correlations were found among them. Furthermore, relationships were explored between these parameters and some measurements that were thought to have influenced them. The results of the geometric studies could not be proved on the basis of statistical evaluation.     

Age-related changes in sagittal relationship between the maxilla and mandible

The aim of the study was to assess age-related changes in sagittal jaw relationship during pre-pubertal and pubertal development on the basis of angular [ANB, anteroposterior dysplasia indicator (APDI) and A-B plane angle] and linear (Wits, AF-BF, App-Bpp, and App-Pgpp) measurements. Lateral cephalograms of orthodontically untreated subjects were evaluated at 7, 9, 11, 13 and 15 years of age. Cephalometric standards and age-related changes were determined on the basis of Class I subjects with a good occlusion (n = 18, 10 males and 8 females). With respect to changes related to growth, the main findings were, in both genders, a statistically significant age-related decrease in ANB angle, App-Bpp and App-Pgpp, a significant increase in APDI, but no age-related change in Wits. A reduction of sagittal jaw distance during pre-pubertal and pubertal development was observed arising from a relative dominance of sagittal mandibular growth. For an evaluation of differences concerning jaw relationship in Class II subjects, a group with Class II division 1 malocclusions (n = 17) and a group with Class II division 2 malocclusions (n = 12 were compared with two control groups, i.e. the good occlusion group and a Class I group (n = 37). Conclusions about the sagittal discrepancy in Class II division 1 and Class II division 2 subjects depended on the geometric reference used in the various parameters, and further research is called for with respect to the diagnostic performance of the various measurements. Differences between Class II subjects and controls present at 15 years of age were already established at 7 years of age, but were less pronounced.     

颅底重叠法Wits值的评价

目的 探讨颅底重叠法测量Ｅｉｔｓ值与常规Ｗｔｉｓ值测量法对评价治疗前后颌骨矢状关系改变的可靠性。方法 样本为４８例经过正畸治疗的错卧倒患者的头颅侧位片，用计算机数字化仪测量法分别测量常规Ｗｉｔｓ值、颅底重叠法Ｗｉｔｓ值及ＡＮＢ角在治疗前后的变化，用ＳＡＳ软件包对３者间的相关笥进行统计分析。结果 重叠法Ｗｉｔｓ值与ＡＮＢ角之间的相关笥明显高于常规Ｗｉｔｓ值，相关系数高达０．８４９，差异具有高度显著性     

Properties of the ANB angle and the Wits appraisal in the skeletal estimation of Angle's Class III patients

The aims of the present study were: (1) to investigate the statistical differences in jaw relationship assessments with the ANB angle and the Wits appraisal in Angle Class III children, and (2) to suggest guidelines for the use of these two parameters in this group of children. Seventy-five Angle Class I children with anterior crowding (male, 37; female, 38) and 96 Angle Class III children with anterior crossbite (male, 38; female, 58) were examined. All had undergone treatment that started at 8 or 9 years of age. Pre-treatment lateral cephalograms were used cross-sectionally for the analysis. The mean age was 8 years 7 months +/- 9 months in the Class I subjects, and 9 years 0 month +/- 7 months in the Class III subjects. To compare the assessments using ANB angle and the Wits appraisal in the Angle's Class III subjects, nine measured values from each individual subject were converted into Z scores in relation to the means and standard deviations of the two parameters in the Angle Class I subjects. The jaw discrepancy is assessed more severely using the ANB angle than by the Wits appraisal in these Angle Class III subjects. The paired t-test showed that the Z score of the ANB angle was significantly smaller than that of the Wits appraisal (P < 0.001). In Angle Class III subjects with a counter-clockwise mandibular rotation and a flattened occlusal plane, the ANB angle is a more critical cephalometric parameter than the Wits appraisal.     

Effects of functional versus bisected occlusal planes on the Wits appraisal

Lateral cephalometric radiographs of 35 males between the ages of 11 years and 24 years, all of whom had Class II, Division 1 malocclusions, were traced and Wits appraisals were completed with the use of two occlusal planes: the functional occlusal plane and the bisected occlusal plane. These two values were then statistically related to two dental parameters (overjet and incisor angulation [1 to 1]) and one skeletal parameter (angle ANB) by means of the Pearson product-moment correlation with a predetermined level of statistical significance at p less than 0.05. The findings demonstrated that Wits values for both occlusal planes were significantly correlated to both skeletal and dental parameters. Each Wits value also shared variance with the Wits value for the other occlusal plane. Both Wits measures seem to vary to the same degree when compared to the other measures, as demonstrated by the r values. From the results of this experiment, three conclusions can be drawn: (1) either occlusal plane can be used in the calculation of the Wits appraisal to aid in the diagnosis of the severity or degree of anteroposterior jaw disharmony, (2) the bisected occlusal plane Wits appraisal value showed a higher relationship to dental measures than the functional occlusal plane Wits appraisal value, and (3) the functional occlusal plane Wits value shared slightly more variance with skeletal measures.