The effect of different techniques on suspension in aesthetic finger prosthetics

Abstract: Aesthetic finger prosthetics provide functional and cosmetic benefits. Good suspension of the prosthesis plays a role in the functional and aesthetic effects, and a loose fit can lead to rejection of the prosthetic.  In this thesis, we will compare two different suspension techniques (the addition of ridges and the addition of a central tunnel) and their effect on prosthetic retention along with the effect of differing socket lengths. Method: Six finger prosthetics were fabricated with different techniques and lengths. The strength of suspension was evaluated using a novel approach. Results: Shorter sockets with more aggressive volume reduction resisted a mean maximum force of 9.25N, and the longer sockets resisted a mean force up till 32.66N. The prosthetic with a central tunnel and shorter socket resisted a mean force up till 46.04N. Ridges between short and long sockets had inconsistent readings. Conclusion: Whether ridges or central tunnel influenced suspension strength was inconclusive. How volume reductions were done had a notable effect on suspension. Prosthetics with a shorter socket provided a tighter fit and had better suspension. When adequate prosthetic fit was achieved, the central tunnel had an improved effect on suspension strength.