Rebasing / relining and repairs - Prosthetic dentistry
Rebasing / relining and repairs
The fit of the prosthesis can deteriorate due to many causes, such as shrinking and extractions. The associated complaints are reduced grip and stability of the prosthesis, too low bite height, gum irritations and no longer properly fitting the upper and lower prosthesis. A rebasing or relining can be applied to resolve these complaints.
- A rebasing of a prosthesis means that the space created between gums and prosthesis is filled with synthetic resin, whereby all old synthetic resin is also replaced by new ones. In fact, only the teeth remain the same. Rebasing is also called transfer, the transfer of old teeth into new synthetic resin.
- During the relining, the space between gums and prosthesis is also filled with synthetic resin. However, the other synthetic resin is not being replaced. So only a new layer is applied to the old prosthesis, a new "lining." The disadvantage of relining is that one often sees color differences between old and new synthetic resin.
Rebasing or relining is carried out in the following situations:
- If the bite has been lowered (but this reduction may not exceed a few millimeters);
- If the grip and stability of the prosthesis are reduced, which is often accompanied by inflammation of the gums by sliding the prosthesis;
- If there are relatively long prostheses due to shrinking that cause irritation.
We distinguish two methods:
- Conventional method. The old prosthesis is considered to be an individual spoon, which after trimming the edges is built up with stents and with which an individual impression is made;
- Processing with tissue conditioner. The functionally shaped edges of the prosthesis are shortened and a tissue conditioner is applied to the prosthesis and to the edges. The patient is asked to come back after a few days. During this period, the initially plastic conditioner layer forms to the movements of the jaws. The patient is instructed to carefully clean the prosthesis and certainly not to brush it with a stiff brush, as otherwise the conditioner layer will come loose or crumble.
In both method 1 and method 2, the applied materials are replaced by synthetic resin. This is done in the dental laboratory. The patient must miss the prosthesis for one day. If you want a rebase, all synthetic resin will also be replaced (see image below).
Prosthesis connection. a Well-fitting prosthesis. b After resorption of the jaw walls, space will be placed under the prosthesis and the prosthesis will press on the edges (arrows). The created space is filled with synthetic resin (reline) or the prosthesis is provided with a completely new base (rebase).
Most repairs will be done by the technician. Sometimes the dentist or assistant carries out small repairs himself. For example, renewing or re-fixing an element or repairing a fracture or crack in the prosthesis.