以计算机图片定点测量ANB角、AXB角、Beta角及APDI值:评估替牙列期安氏Ⅲ类错者上下颌骨矢状位置的关系  

Fixed-point measurement of ANB angle,AXB angle,Beta angle and APDI value:To evaluate sagittal discrepancy between mandible and maxilla in transitional dentition cases with Angle's class Ⅲ malocclusion

作　　者：刘红[1] 米丛波[1] 阿依古丽.吐尔地[1] 潘旭[1] 朱婷婷[1] 陈亮[1] 

机构地区：[1]新疆医科大学第一附属医院口腔正畸科,新疆维吾尔自治区乌鲁木齐市830054

出　　处：《中国组织工程研究与临床康复》2010年第9期1563-1566,共4页Journal of Clinical Rehabilitative Tissue Engineering Research

摘　　要：背景:正确评价上下颌骨基骨的矢状位置关系在正畸患者的诊断和治疗过程中是十分重要的。目前临床常用来评价上下颌骨矢状方向位置关系的指标主要为ANB角、AXB角、Beta角和APDI值,相关性及变异度分析是判断这些指标可靠性的重要方法。目的:比较ANB角、AXB角、Beta角和APDI值评估替牙期安氏Ⅲ类错患者上下颌骨矢状位置关系的可靠性。方法:选择2004-01/2009-06在新疆医科大学第一附属医院口腔就诊的替牙期安氏Ⅲ类错畸形患者共计56例,所有患者的头颅定位侧位片均由同一熟练技师严格按要求在同一机器上拍摄。用Microtek纷腾9800XL扫描仪以1:1比例,300dpi象素对胶片进行扫描,扫描结果以Jpg格式存盘,由第一作者用Photoshop8.0图像处理软件对导入计算机中的图片进行定点,测量ANB角、AXB角、Beta角和APDI值,每项指标测量3次,最后取平均值。对测量结果进行相关性及变异度分析。结果与结论:替牙期安氏Ⅲ类错患者的ANB角、AXB角、Beta角和APDI值之间均存在相关性(P<0.05);4项测量指标的变异程度不同,ANB角、AXB角、Beta角和APDI值的变异系数分别为1.35,0.75,0.07和0.04。结果提示,ANB角、AXB角、Beta角和APDI值在评价替牙期安氏Ⅲ类错畸形颌骨矢状关系时均具有一定的准确性,而APDI值的可靠性更好。BACKGROUND：It is very important to appreciate the Sagittal discrepancy during the diagnosis and therapy in orthodontics patients.At present,ANB angle,AXB angle,Beta angle and APDI value were often used to evaluate the mandible and maxilla relationships in orthodontic clinic.Correlation and variance degree among these parameters were analyzed to judge the reliability.OBJECTIVE：To compare the reliability of ANB angle,AXB angle,Beta angle and APDI value in assessing sagittal discrepancy between mandible and maxilla in transitional dentition cases with Angle＇s class Ⅲ malocclusion.METHODS：Totally 56 patients of Angle＇s class Ⅲ malocclusion in transitional dentition at the Department of Orthodontics,First Affiliated Hospital of Xinjiang Medical University,between January 2004 and June 2009,were selected.ANB angle,AXB angle,Beta angle and APDI value of Angle＇s class Ⅲ malocclusion in transitional dentition were measured on the cephalometric radiographs.The radiographs were scanned by Microtek Phantom 9800 XL scanner at proportion of 1：1 with 300 dpi pixels,and saved as JPG format.The JPG pictures were fixed-point using Photoshop 8.0 to measure ANB angle,AXB angle,Beta angle and APDI value,the mean value was obtained after 3 times measurement.The correlation and variance degree among these parameters were analyzed.RESULTS AND CONCLUSION：Significant correlation was found among ANB angle,AXB angle,Beta angle and APDI value（P 0.05）.The coefficients of variation for the 4 indexes were 1.35,0.75,0.07 and 0.04,respectively.The results demonstrated that,it is accurate to use ANB angle,AXB angle,Beta angle and APDI value as cephalometric norm to evaluate sagittal discrepancy of maxmandibul in transitional dentition cases with Angle＇s class Ⅲ malocclusion.However,the APDI value is more reliable as cephalometric norm.

关 键 词：安氏Ⅲ类错 替牙期 头影测量 矢状不调 可靠性 

分 类 号：R683[医药卫生—骨科学]