Vertical removal force and torsional resistance of a screwless Morse taper implant connection

Abstract

Aims: The aim of this study was to measure the removal force and vertical tensile strength of a screwless Morse taper connection and compare it with screw retained connections. Methods: n order to measure the vertical tensile and torsional strength of the connection, a total of 12 Octo Implants (Tasarimmed, Istanbul, Turkey) 4 mm wide and 10 mm in length were used with a screwless Morse taper connection. Six repeated shots were applied to abutments for each standardized force: 300 grF, 500 grF, 800 grF, 1000 grF, 1400 grF, and 2500 grF. Measurements of vertical tensile strength and torsional strength were obtained four times for each group with a dynamometer and torque meter. Results: The results were analyzed using a 1-way ANOVA test. The intercept was found to be significantly different among the various strike forces for both vertical tensile strength and torsional strength (p lessthan .0001). A greater increase in the torsional and vertical strength was seen for 1400 grF strikes and was consequently entitled as a break point. Conclusion: Screwless Morse taper connection is predicted to be an adequate resistant to vertical removal and torsional forces.