Cosmetic dentures, as you can imagine, are made to look as natural as possible. Unlike standard dentures that use a heat curing process which leads to dentures that become ill-fitting over time, cosmetic dentures are made from a special acrylic base that eliminates the possibility of the denture shrinking and warping.
Furthermore, some cosmetic dentures achieve a natural appearance through the use of implants. Implants are installed in the mouth so that the dentures have something to hold onto. The cosmetic denture will either rest on or snap onto the implant. What this does is allow the denture to stay in place without the chance of it moving around, which makes the denture more comfortable than a standard one.
A single denture is required when no teeth remain in either the upper or the lower dental arch. They are made of a pliable material which makes suction easy. However, it is for this reason that standard full dentures require routine visits to the dentist. Being pliable, the dentures are susceptible to shrinkage, thus creating an ill-fitting prosthetic that can result in the atrophy of the jawbone.
An RPD or removable partial denture, is partial because the patient retains a certain number of functional teeth around which the denture fits. It is removable because it can be taken out and put back in without professional help.