The objective of the present study was to evaluate the mechanical behavior of two different Morse taper implant systems. Twenty self-locking Morse taper implants, 2.9 mm in diameter (FAC), and 20 Morse taper implants, 3.5 mm in diameter (CM) were divided into two groups (n=10), submitted to strength to failure test, optical microscopic evaluation of fracture, metallographic analysis of the alloy, finite element analysis and strain gauge test. The statistical analysis was performed using the Student’s t-test (?=0.05). The resistance to fracture was statistically different (p<0.001) between FAC (225.0±19.8 N) and CM (397.3±12.5 N). The optical microscopic evaluation showed that implants became fractured in the discontinuity region of the abutment/implant interface, the region of stress accumulation in FEA. Metallographic analysis showed that implants from the FAC group are composed of titanium-aluminum-vanadium alloy. In the strain gauge test, there was no statistical difference (p=0.833) between CM (1064.8±575.04 ?S) and FAC (1002.2±657.6 ?S). Due to a lack of clinical data with respect to the use of these implants, it is recommended that they be used in areas with low masticatory effort.

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