Newburg R E, Pameijer C H
J Prosthet Dent. 1976 Dec;36(6):636-43. doi: 10.1016/0022-3913(76)90027-5.
An investigation was conducted in which different post and core systems were subjected to tensile, shear, and torque forces and their abilities to resist such forces were measured. The following conclusions can be drawn: (1) A post and core unit made of composite resin alone, without the additional retention provided by cemented posts or threaded pins, is the least retentive, and its use should be discouraged. (2) The retention of composite resin cores by four threaded pins compares favorably with other accepted techniques. (3) A round post retaining a composite resin core alone provides poor resistance to torque, but with the addition of threaded pins, its ability to resist displacement improves substantially. (4) The procedure in which composite resins are used to restore the coronal portion of pulpless teeth, with threaded pins and/or posts in the root canal, is reliable.
进行了一项研究，对不同的桩核系统施加拉伸、剪切和扭转力，并测量它们抵抗这些力的能力。可以得出以下结论：（1）仅由复合树脂制成的桩核单元，没有粘结桩或螺纹钉提供的额外固位力，固位力最差，应不鼓励使用。（2）四个螺纹钉固定复合树脂核的固位力与其他公认技术相比具有优势。（3）单独使用圆形桩固定复合树脂核时，抗扭转能力较差，但添加螺纹钉后，其抗移位能力显著提高。（4）使用复合树脂修复无髓牙牙冠部分，并在根管内使用螺纹钉和/或桩的方法是可靠的。
