200颗恒磨牙髓室底的解剖形态

The anatomy of pulp floors of 200 permanent molars

目的 研究恒磨牙髓室底的解剖形态 ,为临床治疗提供依据。方法 将 2 0 0颗恒磨牙沿牙颈缘截去牙冠 ,采用XTL 2型立体显微镜 ,目镜测微尺对髓室底的截面形态、髓室底发育沟、根管口数目及其间距进行观测。结果 6髓室底全为四边形 ;7髓室底三角形占 6 0 % ,四边形占 40 % ;6髓室底四边形占 74% ,五边形占 2 6 % ;7髓室底四边形占 90 % ,三角形占 10 %。上颌磨牙髓室底多为“7”和“Y”形沟 ;下颌磨牙多为中央形沟和颊侧沟 ;7髓室底“C”形沟占 16 %。同时还获得恒磨牙根管口数目及根管口间距的有关数据。

Objective To study the morphiology of pulp floors of permanent molars, provide references for clinical treatment.Methods 200 permanent teeth were collected, the crowns were cut ,using XTL 2 stereo microscope to study the shape of pulp floors.Results The shape of cutting face, developing grooves and the number of the root canal orifices and the distance between them were measured.Conclusion Graspping the anatomy of pulp floors is important for endodontical treatments of molars.