Search for: [Abstract = "ely\: 31.5%, 45.5%, 55.3% and 66%. Reduction of mean values of destruction energy, in study groups relative to control was successively\: 23.3%, 41.2%, 48.5% and 66.8%. Regression analysis found the relationship of the rectilinear character between decreasing dimension cervical part of the tooth and destructive force, as well as between these measurements in extruded groups and destruction energy.The gradual decrease in the resistance parameters refers to a group of teeth reconstructed prosthetically and groups extruded 2 mm and 4 mm. In the fourth study group rapid decrease of resistance parameters, and an increasing number of cumulative internal stress of the sample before the moment when the resistance is exceeded was observed. The degree of taper shape of the root affects the loss of mechanical parameters in course of extrusion.In conclusion, the study has showed an inverse relationship between the degree of the achieved tooth’s extrusion and the relative change of its mechanical strength. Parameters determining strength of extruded and prosthetically restored teeth are the remaining length of the tooth’s root and expected after treatment crown to root ratio. An equation allowing the prediction of success of extrusion for prosthetic reconstruction has been developed\: , where A is the length of future prosthetic crown, B is the length of the remaining root and C is the size of"]

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