骨性Ⅲ类错(牙合)伴下颌偏斜成人下颌骨形态的CBCT研究
发布时间:2018-02-15 06:23
本文关键词: 骨性Ⅲ类 下颌偏斜 锥形束CT 下颌骨 髁突 出处:《河北医科大学》2013年硕士论文 论文类型:学位论文
【摘要】:目的:骨性Ⅲ类错牙合畸形一直是临床正畸治疗中的难点和热点,骨性Ⅲ类伴下颌偏斜的患者治疗难度更大,治疗效果不确切。研究骨性Ⅲ类伴下颌偏斜患者下颌骨形态特征具有重要的临床意义。本研究通过锥形束CT资料对骨性Ⅲ类伴下颌偏斜成人患者的下颌骨进行分析,比较其与正常牙合下颌骨形态的差异,研究骨性Ⅲ类伴下颌偏斜成人患者下颌骨的形态特征。 方法:研究对象分为两组:2010年10月-2012年10月前来河北医科大学口腔医院正畸科就诊的患者中选取骨性Ⅲ类伴下颌偏斜的成人患者20例(男10例,女10例,年龄范围18-31岁,平均年龄21.5岁)作为偏斜组;从河北医科大学学生中选取个别正常牙合20例(男10例,女10例,年龄范围年龄18-28,平均年龄20.95岁)作为正常牙合组。对每位研究对象拍摄锥形束CT片。锥形束CT数据均以Dicom格式保存,使用Invivo5软件对下颌骨进行三维重建、定位标记点,对下颌骨进行线距、角度和体积的测量,所有研究对象知情同意。 通过下颌孔点、颏孔点、下颌体曲线点及不同的解剖断面设定相关的测量项目:髁突的单位长度、喙突的单位长度、下颌角的单位长度、下颌体的单位长度、颏部的单位长度、下颌体后半部分长度、下颌体前半部分长度、下颌角的角度、下颌升支长度、下颌体长度、下颌骨总长度、半侧下颌骨体积、下颌升支体积、下颌体体积、磨牙区宽度、磨牙区高度、尖牙区宽度和尖牙区高度。采用SPSS13.0统计学分析软件,对各项数据进行正态性检验,若服从正态则采用均数(X)和标准差(S)进行描述,在偏斜组和正常牙合组中分别采用独立样本t检验分析是否存在性别差异,偏斜组和正常牙合组内左右两侧通过采用配对t检验分析测量项目研究是否存在差异,采用独立样本t检验对偏斜组和正常牙合组的测量项目进行分析,研究两组间是否存在差异;若不服从正态分布则采用中位数(M)和四分位数间距(Q)进行描述,采用Wilcoxon秩和检验进行统计分析。检验水准α=0.05。 结果: 1通过两个独立样本t检验显示男女性别差异对本实验的研究结果没有影响(P0.05)。 2对正常牙合组中下颌骨进行相关硬组织测量结果显示左右两侧髁突、下颌升支和下颌体长度差异无统计学意义。 3对偏斜组中下颌骨进行相关硬组织测量结果显示:对侧髁突的单位长度(44.22±3.71mm)与偏斜侧髁突的单位长度(43.43±3.69mm)差异有统计学意义(P0.05);对侧下颌角的单位长度(25.18±3.48mm)与偏斜侧下颌角的单位长度(24.48±3.65mm)差异有统计学意义(P0.05);对侧下颌体的单位长度(64.45±3.80mm)与偏斜侧下颌体的单位长度(63.10±3.90mm)差异有统计学意义(P0.05);对侧下颌体后半部分长度(70.54±4.43mm)与偏斜侧下颌体后半部分长度(69.17±4.09mm)差异有统计学意义(P0.05);对侧下颌角的角度(116.4±6.2°)与偏斜侧下颌角的角度(118.7±5.5°)差异有统计学意义(P0.05);对侧下颌升支长度(63.69±6.20mm)与偏斜侧升支长度(62.17±6.22mm)差异有统计学意义(P0.05);对侧下颌骨总长度(128.85±6.15mm)与偏斜侧下颌骨总长度(127.07±6.63mm)差异有统计学意义(P0.05);对侧半侧下颌骨体积(26.21±4.64cm3)与偏斜侧半侧下颌骨体积(25.27±4.58cm3)差异有统计学意义(P0.05);对侧下颌升支体积(7.97±1.71cm3)与偏斜侧下颌升支体积(7.31±1.74cm3)差异有统计学意义(P0.05);下颌体长度、下颌体体积、下颌体前半部分长度、喙突单位长度、颏部单位长度、磨牙区高度、磨牙区宽度、尖牙区高度和尖牙区宽度无统计学差异(P0.05)。 4正常牙合组与偏斜组中左右两侧差值分析结果显示:正常牙合组髁突的单位长度差值(-0.15±1.11mm)与偏斜组髁突的单位长度差值(0.78±0.94mm)差异有统计学意义(P0.05);正常牙合组下颌体的单位长度差值(-0.33±0.94mm)与偏斜组下颌体的单位长度差值(1.35±0.89mm)差异有统计学意义(P0.05);正常牙合组下颌体后半部分长度差值(0.01±0.45mm)与偏斜组下颌体后半部分长度差值(1.37±2.30mm)差异有统计学意义(P0.05);正常牙合组下颌角角度差值(0.1±1.2°)与偏斜组下颌角角度差值(-2.3±1.5°)差异有统计学意义(P0.05);正常牙合组下颌升支长度差值(0.15±0.53mm)与偏斜组下颌升支长度差值(1.52±0.98mm)差异有统计学意义(P0.05);正常牙合组下颌骨总长度差值(-0.04±1.09mm)与偏斜组下颌骨总长度差值(1.77±1.58mm)差异有统计学意义(P0.05);正常牙合组半侧下颌骨体积差值(0.09±0.71cm3)与偏斜组半侧下颌骨体积差值(0.94±1.09cm3)差异有统计学意义(P0.05);正常牙合组下颌升支体积差值(0.10±0.45cm3)与偏斜组下颌升支体积差值(0.66±0.77cm3)差异有统计学意义(P0.05);下颌体长度差值、下颌体体积差值、下颌体前半部分长度差值、喙突单位长度差值、下颌角单位长度差值、颏部单位长度差值、磨牙区宽度差值、磨牙区高度差值、尖牙区宽度差值和尖牙区高度差值无统计学意义(P0.05)。 结论: 1成人个别正常牙合左右两侧髁突、下颌升支、下颌体有较好的对称性。 2成人骨性Ⅲ类错牙合伴下颌偏斜主要表现在髁突和下颌升支的左右不对称,偏斜侧的髁突与下颌升支小于对侧;下颌体的后部也有不对称,,但是程度相对较轻;下颌体前半部分两侧基本对称。
[Abstract]:Objective: skeletal Class III malocclusion is hotspot in clinical orthodontic treatment, patients with difficulty in treatment of skeletal class mandibulardeviation greater treatment effect is not exact. It has important clinical significance of skeletal Class III patients with mandibular deviation of mandible morphology. Through the study of cone beam CT data of bone class III adult patients with mandibular deviation of the mandible were analyzed, compared with normal occlusion and mandibular morphology, morphological characteristics of skeletal Class III adult patients with mandibular deviation of the mandible.
Methods: the subjects were divided into two groups: 20 adult patients in October 2010 -2012 year in October to the Hebei Medical University stomatology hospital patients were selected from skeletal class mandibulardeviation patients (male 10 cases, female 10 cases, age 18-31 years old, the average age of 21.5 years) as a skew group; select individual normal occlusion from Hebei Medical University students in 20 cases (male 10 cases, female 10 cases, age range, age 18-28, mean age 20.95 years) as the normal occlusion group. Shooting cone beam CT tablet on each subject. Cone beam CT data are saved in Dicom format, the 3D reconstruction of mandible with Invivo5 software, the location of markers. The mandible line distance, angle and volume measurement, all subjects gave informed consent.
The mandibular foramen, foramen, mandibular body curve and different anatomical sections set the relevant measurement items: per unit length of condyle and coronoid process unit length per unit length, mandibular angle, mandibular body length units, unit length of chin, mandibular body back end length, mandibular body half of the length, the angle of mandibular angle and ramus length, mandibular body length, total length of the mandible, half mandibular ramus volume, volume, volume of mandibular molar area, width, height and width of the molar area, the area of canine canine height. Analysis by SPSS13.0 statistical software, the data is the normality test, if the normal use mean (X) and standard deviation (S) is described in the skew group and normal occlusion group by gender differences in the existence of independent samples t test analysis, skew group and normal occlusion group in the left and right sides of the 鐢ㄩ厤瀵箃妫
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