Keyf F, Sahin E
Department of Prosthodontics, Hacettepe University, Ankara, Turkey.
Aust Dent J. 1994 Feb;39(1):20-4. doi: 10.1111/j.1834-7819.1994.tb05541.x.
The retention in root canals of Flexi-Posts, Para-Posts and Brasseler/Vlock-Posts was measured using tensile and compressive/shear forces. Forty-two extracted maxillary anterior teeth were embedded in self-curing acrylic resin and treated endodontically. Each root canal was prepared with the appropriate matching drills for the post-core system chosen. Each post-core was cemented in the canal with zinc phosphate cement. A tensile force was applied along the long axis of each tooth and the force needed to dislodge the post-core was recorded. There was no difference in retention between the small diameter posts, but the difference between the medium and the large diameter posts, however, was significant. In the medium diameter post group, the Flexi-Post was approximately twice as retentive as the other two post-core systems evaluated. In the second series of tests compressive/shear force was applied at an angle of 130 degrees to the long axis of the tooth. The retention difference between the small diameter posts was found to be statistically significant, Flexi-Posts being more retentive than Para-Posts and B/V-Posts.
使用拉伸力和压缩/剪切力测量了Flexi桩、Para桩和Brasseler/Vlock桩在根管内的固位力。42颗拔除的上颌前牙被嵌入自凝丙烯酸树脂中并进行根管治疗。每个根管都用适合所选桩核系统的配套钻头进行预备。每个桩核用磷酸锌水门汀粘固在根管内。沿每颗牙齿的长轴施加拉伸力，并记录使桩核脱位所需的力。小直径桩之间的固位力没有差异，但中直径桩和大直径桩之间的差异显著。在中直径桩组中，Flexi桩的固位力约为所评估的其他两种桩核系统的两倍。在第二组测试中，以与牙齿长轴成130度的角度施加压缩/剪切力。发现小直径桩之间的固位差异具有统计学意义，Flexi桩比Para桩和B/V桩的固位力更强。
