Gelfand M, Smith D C
J Can Dent Assoc. 1989 Apr;55(4):309-12.
The retentive strength of post and cores fabricated entirely of composite material was compared to the retentive strength of Para Posts with composite cores in etched and unetched post preparations. Under tensile forces exerted upon the cores, only one post was removed. In all other samples the posts remained firmly embedded within the roots. The core material fractured at the occlusal surface of the roots. The Para Post with Composite core cemented into etched preparations was significantly more resistant to fracture than all other samples.
将完全由复合材料制成的桩核的固位强度与在蚀刻和未蚀刻桩预备体中带有复合核的帕拉桩的固位强度进行比较。在对核施加拉力时，仅一个桩被移除。在所有其他样本中，桩仍牢固地嵌入牙根内。核材料在牙根的咬合面处断裂。粘结到蚀刻预备体中的带有复合核的帕拉桩比所有其他样本对断裂的抵抗力明显更强。
