[1]许骏杨,陈明,杨叶青,等.锥形束CT分析下颌第一磨牙近中第三根管弯曲度[J].南方医科大学学报,2018,(07):824.
点击复制

锥形束CT分析下颌第一磨牙近中第三根管弯曲度()
分享到:

《南方医科大学学报》[ISSN:/CN:]

卷:
期数:
2018年07期
页码:
824
栏目:
出版日期:
2018-07-16

文章信息/Info

Title:
Cone-beam computed tomography for determination of mesial root canal curvatures of human mandibular first molars
作者:
许骏杨陈明杨叶青吴补领
关键词:
锥束CT近中第三根管下颌第一磨牙
Keywords:
cone beam computed tomography middle mesial canals mandibular first molars
摘要:
目的利用锥形束CT(CBCT)扫描并研究下颌第一磨牙近中第三根管发现率及其根管弯曲度。方法对我院口腔科就诊 的1600名患者的下颌第一磨牙进行CBCT扫描,将发现近中第三根管的患者分为5组(A组:18~29岁;B组:30~39岁;C组:40~ 49岁;D组:50~59岁;E组:60~80岁)。对纳入的所有图像均采用Planmeca Romexis CBCT机的图像重建系统进行三维重建并 测量,并采用改良的Schneider 法对根管弯曲度、弯曲部位进行测量,进一步研究根管形态并对其根管系统进行分析。结果 1600 个患者的2856 颗下颌第一恒磨牙,有168 例存在近中第三根管(5.88%),发现率分别为:A组37.50%、B组17.80%、C组 14.88%、D组19.64%、E组10.12%;A组近远中向根管弯曲度中度大于其他各组,差异有统计学意义(P<0.05);5组根管近远中向 根管弯曲度差异有统计学意义(P<0.05),且A组近远中向根管弯曲度>C、D、E组,差异有统计学意义(P<0.05);5组根管颊舌向 弯曲度相比较,差异无统计学意义(P>0.05);近远中向和颊舌向弯曲部位在根中1/3处的发现率显著高于根冠1/3处与根尖1/3 处,差异有统计学意义(P<0.01)。结论下颌第一磨牙近中第三根管发现率会随年龄增大而降低,根管弯曲度会随年龄增长而 增加,特别是在30岁之后出现较为明显的下降趋势;下颌第一磨牙近中第三根管系统复杂且多变,大多数都会出现近远中向及 颊舌向明显的弯曲且弯曲多发生在根中1/3处;CBCT能为临床治疗提供有效的指导,减少临床实际操作的失败率。
Abstract:
Objective To investigate mesial root canal curvatures of human mandibular first molars using cone-beam computed tomography (CBCT). Methods CBCT was performed for scanning the mandibular first molars of 1600 Chinese subjects, among whom the subjects identified to have middle mesial canals were divided into 5 age groups, namely group A (18-29 years), group B (30-39 years), group C (40-49 years), group D (50-59 years), and group E (60-80 years) for further analysis. All the CBCT images were reconstructed using Planmeca Romexis CBCT image reconstruction system, and the curvature of the mesial root was measured using the Schneider method. Results A total of 2856 CBCT images were obtained from the 1600 subjects, among whom 168 (5.88%) were found to have middle mesial canals in the mandibular first molars. The prevalence of middle mesial canals was 37.50% in group A, 17.80% in group B, 14.88% in group C, 19.64% in group D, and 10.12% in group E. The moderate of the curvature in the mesiodistal direction was significantly higher in group A than in the other groups (P<0.05); the curvature in mesiodistal direction differed significantly among the 5 groups (P<0.05), and was the greatest in group A followed by group C and group D, and was the smallest in group E. The curvature in the buccolingual direction was similar among the 5 groups. The incidence of mesiodistal and buccolingual curvature of the middle mesial canals was significantly higher in the middle 1/3 of the root canal than in the upper 1/3 and apical 1/3 of the root canal. Conclusions The incidence of middle mesial canals in the mesial root of the mandibular first molars decreases with age. The middle mesial canal system of the mandibular first molar is complex and variable, and most of the first molars have obvious curvature in the mesiodistal and buccolingual directions. CBCT can provide reference for clinical treatment to reduce the treatment failure rate.
更新日期/Last Update: 1900-01-01