摘要
目的:利用锥形束CT观察分析老年人下颌磨牙的牙根、根管数目和形态。方法:选择能够配合检查,并在扫描过程中头部保持静止状况的老年人,对其牙齿进行锥形束CT扫描,对扫描图像进行三维重建和选择不同方向的断层观察记录下颌磨牙的牙根和根管。结果:锤形束CT检查老年人166例,下颌磨牙共532颗。下颌磨牙近中根均为单根,远中双根仅发生于下颌第一磨牙,而C形根则仅发生于第二磨牙。近中根以两根管为主在下颌第一磨牙和第二磨牙分别占有95.26%和50.38%;远中根以一根管为主在第一磨牙和第二磨牙分别占有64.60%和56.97%,C形根管的发生率为22.48%。结论:下颌磨牙牙根和根管的变化主要发生在第一磨牙的远中根和第二磨牙的C形根及C形根管。
Objective： Investigate the number of roots,the number of canals, and canal morphology in the elderly using cone beam computer tomography. Methods： the aged patient can keep head motionless during examination of cone beam computer tomography. It was viewed and analyzed the scanning three-dimensional image of root and canal of mandibular molar. Result： 166 aged patients was examination by cone beam computer tomography. It was investigated 532 mandibular molars. It found that mesioroot is single root in mandibular molar. The double root is only in distal root of mandibular first molar, and C shape root is only in mandibular second molar. Mesial root of two canals mandibular molar were occupied 95.26% in first molar and 50.38% in second molar. Distal root of one root canal mandibular molar were occupied 64.60% in first molar and 56.97% second molar. It was found that 94 C-shaped root in mandibular second molar has 58 C-shaped root canal. Conclution： The root change occurs in distal root of mandibular first molar.It is noticed that C-shaped root of mandibular molar doesn＇ t all be C-shaped root canal.
出处
《中华老年口腔医学杂志》
2009年第4期206-209,共4页
Chinese Journal of Geriatric Dentistry
关键词
锥形束CT
下颌磨牙
老年人
cone beam computer tomography
mandibular molar
elder
