Comparative study of antirotational single tooth
Balfour A, O'Brien GR.
Southern California Implant Institute, Glendale.
Identifying the functional and mechanical limitations of single tooth implant systems
is essential for the long-term success of the restoration. Three designs with different
prosthetic connections were evaluated with their corresponding single tooth
abutments for structural integrity and cyclic fatigue. The internal implant octagon was
the weakest connection under off-axis impact loading and lateral loading, and the
external hexagon implant was rendered unrestorable under lateral loading. Overall,
the internal hexagon design was found to provide the highest degree of single tooth
stability. This was attributed to the increased material strength of the titanium alloy
implant in comparison to the softer CP titanium implant, and to the abutment's longer,
1-degree tapered mating hexagon. J Prosthet Dent. 1995 Jan;73(1):36-43.