Both fixed and removable prostheses may come into question for replacing missing or severely damaged teeth. The appropriate solution is selected by considering the remaining teeth, the periodontium, the bone, the bite and aesthetic needs together.
Fixed prostheses
Fixed prostheses are attached to existing, appropriately prepared teeth or to implants, and cannot be removed by the patient independently. They include, among others, crowns, bridges and certain post-and-core restorations.
Crown
A crown is a prosthesis covering the prepared part of a tooth, which can restore the tooth’s form, function and appearance. It may be indicated when the tooth is damaged to such an extent that a simple filling or inlay no longer provides an adequate restoration.
A crown does not replace a missing tooth: it is made to restore an existing tooth. During fabrication the tooth is prepared, an impression or digital scan is taken, then the crown made in the dental laboratory is fitted after the appropriate form and shade have been established.
Bridge
A dental bridge is used to replace one or more missing teeth. The pontics of the bridge fill the space, and are connected to neighbouring, appropriately prepared teeth or, in some cases, to implants.
With a conventional bridge, the natural teeth serving as abutments must be prepared for retention.
Metal-ceramic prostheses
The inner framework of a metal-ceramic crown is metal, and the outer layer is dental ceramic. Ceramic makes it possible to create a form and colour approaching the natural appearance of the tooth.
Gold-ceramic prostheses
The metal framework of a gold-ceramic crown is made of a gold alloy, onto which a ceramic layer is applied. The gold-alloy framework and the ceramic together provide the mechanical and aesthetic properties of the prosthesis.
Metal-free zirconia prostheses
One of the most important advantages of zirconia-based, metal-free prostheses is an aesthetic appearance close to that of natural teeth. Zirconium oxide is a high-strength ceramic used for dental purposes, suitable for crowns and other prostheses.
Metal-free solutions can be particularly advantageous when aesthetic considerations are of primary importance.
Post-and-core restoration
A post-and-core build-up can be used on a root-treated tooth whose coronal part is substantially damaged, while the root remains in an adequate condition. A post fixed in the root canal can provide a suitable foundation for a later crown.
Removable prostheses
Removable prostheses can be taken out by the patient for cleaning and hygiene. Depending on the extent of tooth loss, a partial or complete denture, or an implant-retained overdenture, can be made.
Partial denture
A partial denture may be needed when teeth are missing in part of the jaw and the condition or position of the remaining dentition does not allow a fixed prosthesis to be made adequately. The prosthesis replaces the missing teeth and may be connected to the remaining teeth by various means of retention.
Complete denture
A complete denture is made in cases of full edentulism. The prosthesis can imitate not only the missing teeth but also the visible part of the gums. Its stability is influenced by the relationship between the base plate and the structures of the oral cavity, as well as by the characteristics of the jawbone and soft tissues.
Implant-retained overdenture
A removable prosthesis stabilised by implants can be a more stable solution than a conventional complete denture. The prosthesis can generally be stabilised with an attachment system connected to at least two, and in many cases four, implants, while the patient can still remove the denture independently.
The possibility of implantation must always be assessed on the basis of an individual examination, as adequate bone volume and the general condition of the oral cavity are also important considerations.