Background: The posts selection and cementation helps to bond with restorative material. Hence, post retention is responsible for long span survival of endodontically restored teeth. The technique and selection of cement selected for cementation will determine the bearing effect of the post retention. Aim: The purpose of the study, evaluate and compare using 3 different techniques about the carbon fibre post push out bond strength at the coronal, middle and apical levels of extracted mandible tooth of single root. Methodology: The premolars extracted were selected about 50 and based on the technique using lentulo-spiral instrument, to the surface post, with the support of elongation tip the material was injected and divided into 3 groups the post space drilled using rely-x light polymerized. In the acrylic resin the root specimens embedded and sectioned and finally measured using Universal testing machine. The overall effort is to subject for the bond strength push out. The failure bond strength specimens were studied and evaluated using operating microscopes. Result: The Elongation tip method as well as lentulo-spiral method p (value 0.052 and 0.0089). Conclusion: Using three techniques Post hoc analysis was done to find out stress bearing capacity at coronal middle and apical levels. The comparison between lentulo-spirals and direct method, the study results such as nil difference in stress bearing capacity.