It is so solid that you can also use it according to the indications in the Fo2 and Fo3 protocols.

Courtesy of Dr. Giocchino Cannizzaro

A study coordinated by Dr. Cannizzaro has compared the result after one year of immediate loading rehabilitations of a complete arch on Prama implants in the maxilla and in the mandible.
 440 patients have been recruited for the study, divided into two homogeneous groups, both composed of 20 patients, 10 with total edentulism in the maxilla and 10 in the mandible. The first group were treated with a total rehabilitation on 3 implants (Fixed-on-3 or Fo3), while two implants were inserted in the patients of the second group (Fixed-on-2 or Fo2). In both cases the clinicians have estabilished an insertion with a minimum torque of 60 Ncm, so as to guarantee an excellent primary stability. 
 The parameters assessed during the first year following the prosthetic loading have been implant failure, prosthetic failure, complications and variations in the marginal peri-implant bone levels. At the end of the observation period no implant failure was registered, nor were fractures or diseases been noticed in the peri-implant area.

On the basis of these results, thanks to Collex connection and to the design of the convergent neck the Prama implant proved to be suitable to support rehabilitations with a Fo2 and Fo3 protocol in patients eligible for such treatments, with a reduced number of implants.
The patients included in this study are kept under observation by the authors , who will publish further follow-ups to confirm these preliminary data.

Read the original abstract:

Cannizzaro G, Loi I, Viola P, Ferri V, Leone M, Trullenque-Eriksson A, Esposito M.
Immediate loading of two (fixed-on-2) versus three (fixed-on-3) implants placed flapless supporting cross-arch fixed prostheses: One-year results from a randomised controlled trial.
Eur J Oral Implantol 2016;9 Suppl 1(2):143-53.