下颌第二恒磨牙牙根解剖形态的CBCT研究

发布时间：2018-04-04 04:22

本文选题：CBCT　切入点：下颌第二恒磨牙　出处：《山东大学》2016年硕士论文

【摘要】：目的：下颌第二恒磨牙由于其复杂的牙根解剖形态常给临床治疗带来困难,本研究利用锥形束CT (cone beam computed tomography, CBCT)技术对下颌第二恒磨牙解剖形态进行研究,分析下颌第二恒磨牙的解剖形态特点,并探讨其解剖特点与牙槽骨吸收程度间的关系,为临床治疗提供理论依据。方法：选取378颗来自不同患者的下颌第二恒磨牙的CBCT图像扫描数据,记录患者的下颌第二恒磨牙形态数据：(1)牙根长度(root length, RL)(2)根管数目、是否C形根管(3)根柱长度(root trunk length, RTL)(4)釉牙骨质界处的近远中径(mesial distal diameter, MDD)和颊舌径(buccal lingual diameter, BLD)(5)釉珠、牙根凹陷的有无(6)根分叉开口下2 mm的宽度(7)釉牙骨质界到牙槽骨距离(测量4个轴角处,取平均值)。同时记录患者的姓名、性别、年龄。所有数据均由三名高年资医师和作者测量,取平均值。结果：1、根分叉开口下2mm的宽度平均值为1.46mm,与釉牙骨质界到牙槽骨距离γ=0.236,P=0.0160.05,结果为正相关,有统计学意义。2、根柱长度平均值4.34mm,最大6.7mm,最小1.9mm。与釉牙骨质界到牙槽骨距离Y=-0.008,P=0.9350.05,结果无相关性,无统计学意义。3、釉牙骨质界处的近远中径平均值10.4mm,最大12.1mm,最小8.4mm。与釉牙骨质界到牙槽骨距离γ=0.286,P=0.0030.05,结果为正相关,统计学意义显著。4、釉牙骨质界处的颊舌径平均值9.4mm,最大11.5mm,最小7.2mm。与釉牙骨质界到牙槽骨距离γ=0.323,p=0.0010.05,结果为正相关,统计学意义显著。5、牙根长度平均值13.9mm,最大17.2mm,最小8.6mm。与釉牙骨质界到牙槽骨距离γ=0.230,P=0.0190.05,结果为正相关,有统计学意义。6、牙根凹陷与釉牙骨质界到牙槽骨距离相关性γ=0.269,P=0.0060.05,结果为正相关,统计学意义显著,牙根凹陷的发生率为96%。7、根管数目与釉牙骨质界到牙槽骨距离相关性Y=0.226,P=0.0210.05,结果为正相关,有统计学意义,其中单根管发生率为1%,2根管为31%,3根管为43%,4根管为24%,5根管为1%。8、C形根管与釉牙骨质界到牙槽骨距离相关性γ=0.114,P=0.2510.05,结果无相关性,无统计学意义,本次试验统计C形根管的发生率为49%。9、釉珠与釉牙骨质界到牙槽骨距离相关性γ=0.226,P=0.0020.05,结果为正相关,有统计学意义,本次试验的结果为2.9%。结论：下颌第二恒磨牙解剖形态多变,根管、牙根结构变异较多。本次测量结果显示,根分叉开口下2毫米的宽度、牙根长度、釉牙骨质界处的近远中径和颊舌径、有无釉珠以及牙根凹陷与釉牙骨质界到牙槽骨距离有相关性,根柱长度、是否C形根管与釉牙骨质界到牙槽骨距离无相关性。CBCT在重建患者的口腔部位的三维结构具有其他检查手段无可比拟的优势。该结果为临床工作者提供了新的参考数据,有助于提高牙体牙周治疗成功率。
[Abstract]:Objective: to study the anatomic morphology of mandibular second permanent molar by cone beam computed tomography (CBCT) technique because of its complex root anatomical morphology.The anatomic characteristics of mandibular second permanent molar were analyzed, and the relationship between its anatomical characteristics and alveolar bone resorption was discussed, which provided a theoretical basis for clinical treatment.Methods: the CBCT images of 378 mandibular second permanent molars from different patients were selected to record the root length and root length of the mandibular second molars, the root length of the mandibular second molars, and the number of root canals.Is the length of the C-shaped canals 3) root trunk length? (4) mesial distal diameters (MDDs) and buccal lingual diameters (BLD5), near the bony boundary of the enamel teeth,The width of 2 mm below the root bifurcation in the root sag was 7) the distance from the enamel bone boundary to the alveolar bone was measured at four axial angles and the average value was taken.The patient's name, sex, and age were also recorded.All data were measured and averaged by three senior physicians and authors.Results the average width of 2mm at the root bifurcation opening was 1.46 mm, which was positively correlated with the distance between the enamel bone and alveolar bone 纬 0.236Pu 0.0160.05.The results showed that the average length of root column was 4.34mm, the maximum was 6.7mm, and the minimum was 1.9mm. the average length of root column was 4.34mm, the maximum was 6.7mm, and the minimum was 1.9mm.There was no correlation with the distance between the enamel bone boundary and the alveolar bone. There was no correlation. There was no statistical significance. The average distance between the enamel bone boundary and the alveolar bone was 10.4mm, the maximum was 12.1mm, and the minimum was 8.4 mm.It was positively correlated with the distance from the enamel bone boundary to the alveolar bone, the result was significant. The mean buccal and lingual diameter at the enamel bone boundary was 9.4 mm, the maximum value was 11.5 mm, and the minimum was 7.2 mm.There was a positive correlation between the distance from the enamel bone boundary to the alveolar bone and the distance from the enamel bone to the alveolar bone. The results showed that there was a positive correlation. The mean root length was 13.9mm, the maximum was 17.2mm, and the minimum was 8.6mm.There was a positive correlation between the distance between the enamel bone boundary and the alveolar bone 纬 0.230 P0.0190.05, the result was positive correlation, there was a statistical significance. The relationship between the root depression and the distance between the enamel bone boundary and the alveolar bone of the enamel tooth root sag was related to the distance between the enamel bone boundary and the alveolar bone. The result was positive correlation, and the statistical significance was significant.The incidence of root sag was 96. 7. The number of root canals was correlated with the distance from enamel bone to alveolar bone.Among them, the incidence of single root canal was 1 and the rate of 2 canals was 31 and 3 was 43. 4 canals were 43 and 4 canals were 24 and 5 canals were 1. 8C root canal and enamel cementum to alveolar bone distance (r = 0. 114) P = 0. 2510.05. The results showed no correlation, and there was no significant difference between the results, and there was no significant difference in the relationship between the incidence of single root canal and the distance between enamel bone boundary and alveolar bone.The incidence of C-shaped root canal was 49. 9. The correlation between enamel bead and the distance from the enamel bone to the alveolar bone was 0.226P0. 0020.05. The result was positive correlation with statistical significance. The result of this experiment was 2. 9.Conclusion: the anatomic morphology of mandibular second permanent molar is variable and the root canal and root structure of mandibular second permanent molar are variable.The results showed that the width of 2 mm under the root bifurcation, the length of the root, the near distal diameter of the enamel bone boundary and the buccal and lingual diameter, the presence of enamel beads and the root sag were correlated with the distance between the enamel bone boundary and the alveolar bone, and the length of the root column.There is no correlation between C-shaped root canal and the distance between enamel bone boundary and alveolar bone. CBCT has an unparalleled advantage in reconstructing the three-dimensional structure of the oral cavity of the patient.The results provide new reference data for clinical workers and help to improve the success rate of periodontal treatment.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：R781.4;R322.41

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