What you saw in hospital burns units was flamazine or another brand name type.
Flamazine consists of a white hydrophilic cream containing micronised silver sulphadiazine 1% w/w in a semi-solid oil in water emulsion. Other ingredients include glycerol monostearate, polysorbates, cetyl alcohol, liquid paraffin, propylene glycol and purified water.
Indications
Flamazine is used for the prophylaxis and treatment of soft tissue infections in a variety of wound types. It is specifically indicated for burn wounds, as an aid to the short-term treatment of infection in leg ulcers and pressure ulcers, and as an aid to the prophylaxis of infection in skin graft donor sites and extensive abrasions. It is also used for the conservative management of finger-tip injuries where pulp, nail loss and/or partial loss of the distal phalanx has occurred.
Other silver dressings and their review and effectiveness can be found here in this study....
http://jmm.sgmjournals.org/cgi/reprint/55/1/59.pdf