基于锥形束CT检查重建图像观察人下颌第一前磨牙根管系统解剖形态  

Observation of anatomical morphology of root canal system of human mandibular first premolar based on cone-beam CT reconstruction image

作　　者：张亚南 孙克勤[1] ZHANG Yanan;SUN Keqin(School of Stomatology,Shanxi Medical University,Taiyuan 030001,China)

机构地区：[1]山西医科大学口腔医学院山西医科大学口腔医院,太原030001

出　　处：《山东医药》2022年第9期27-31,共5页Shandong Medical Journal

摘　　要：目的 基于锥形束CT(CBCT)检查重建图像观察人下颌第一前磨牙根管系统解剖形态。方法 符合纳入标准的1 102颗下颌第一前磨牙CBCT检查重建图像,使用one volume viewer软件观察下颌第一前磨牙的根管形态、根面沟(凹陷)发生情况,并测量不同横截面单根单管牙的最薄根管壁厚度。结果 1 102颗下颌第一前磨牙中,Ⅰ型根管958颗、Ⅴ型根管92颗、C形根管42颗、Ⅲ型根管10颗。424例男性患者Ⅰ型、Ⅲ型、Ⅴ型、C形根管的检出率分别为75.0%、2.4%、15.6%、7.1%,678例女性患者Ⅰ型、Ⅲ型、Ⅴ型、C形根管的检出率分别为94.4%、0、3.8%、1.8%,两者相比,P均<0.05。1 102颗下颌第一前磨牙中有524颗(564条)根面沟(凹陷),根面沟(凹陷)发生率为47.5%。524颗存在根面沟(凹陷)的牙齿中,起始位置在根冠1/3处4颗、在根中1/3处500颗、在根尖1/3处20颗。564条根面沟(凹陷)中,356条在近中根面、194条在远中根面、10条在舌侧根面、4条在颊侧根面,起始位置在根冠1/3处4条、在根中1/3处536条、在根尖1/3处24条。958颗单根单管牙的牙冠与牙根交界处最薄根管壁厚度为(1.74±0.14)mm,男性牙冠与牙根交界处最薄根管壁厚度大于女性(P<0.05);根颈1/3与根中1/3交界处最薄根管壁厚度为(1.24±0.10)mm,男性与女性相比,P>0.05;根中1/3与根尖1/3交界处最薄根管壁厚度为(0.85±0.11)mm,男性与女性相比,P>0.05。结论 下颌第一前磨牙根管形态复杂多变,根管类型中Ⅰ型最为常见,且男女根管类型存在差异。下颌第一前磨牙根面沟(凹陷)发生率较高,好发于近中根面,多起始于根中1/3处。不同横截面单根单管下颌第一前磨牙的最薄根管壁厚度不同,且牙冠与牙根交界处最薄根管壁厚度存在性别差异。Objective To observe the anatomical morphology of root canal system of human mandibular first premolar based on the reconstructed images of cone-beam CT(CBCT).Methods The CBCT images of 1 102 mandibular first premolars meeting the inclusion criteria were reconstructed.We observed the root canal morphology and root canal groove(depression) of mandibular first premolars,and measured the thinnest root canal wall thickness of single premolars in different cross sections by one volume viewer software.Results Among the 1 102 mandibular first premolars,there were958 type Ⅰ root canals,92 type Ⅴ root canals,42 type C root canals and 10 type Ⅲ root canals.The detection rates of typeⅠ,type Ⅲ,type Ⅴ and C root canals in 424 male patients were 75.0%,2.4%,15.6% and 7.1%,respectively.The detection rates of type Ⅰ,type Ⅲ,type Ⅴ and C root canals in 678 female patients were 94.4%,0,3.8%,and 1.8%,respectively(all P<0.05).Among the 1 102 mandibular first premolars,524(564) had root groove(depression),and the incidence of root groove(depression) was 47.5%.Among the 524 teeth with root surface groove(depression),the starting positions were 4 at 1/3 of root crown,500 at 1/3 of root middle and 20 at 1/3 of root apex.Among the 564 root surface grooves(depressions),356 were on the mesial root surface,194 on the distal root surface,10 on the lingual root surface,and 4 on the buccal root surface.The starting positions were 4 at 1/3 of the root crown,536 at 1/3 of root middle,and 24 at 1/3 of root apex.The thickness of the thinnest root canal wall at the junction of crown and root was(1.74±0.14) mm,and the thickness of the thinnest root canal wall at the junction of crown and root in men was greater than that in women(P<0.05).The thinnest root canal wall thickness at the junction of 1/3 of root neck and 1/3 of root middle was(1.24±0.10) mm,with no significant difference between men and women(P>0.05).The thinnest root canal wall thickness at the junction of 1/3 of the middle root and 1/3 of the apical root was(0.85±0.11

关 键 词：牙根管 牙根管形态 牙根管解剖 前磨牙 下颌第一前磨牙 锥形束CT 

分 类 号：R781.4[医药卫生—口腔医学]