A removable implant supported denture (also an implant supported overdenture is a type of dental prosthesis which is not permanently fixed in place. The dental prosthesis can be disconnected from the implant abutments with finger pressure by the wearer. To enable this, the abutment is shaped as a small connector (a button, ball, bar or magnet) which can be connected to analogous adapters in the underside of the dental prosthesis. Facial prosthetics, used to correct facial deformities (e.g. from cancer treatment or injuries) can utilise connections to implants placed in the facial bones. Depending on the situation the implant may be used to retain either a fixed or removable prosthetic that replaces part of the face.
The main disadvantage to a removable implant-supported prosthesis is that this choice is less like natural teeth than fixed options. Removable implant-supported options that are partially tissue-supported also are susceptible to bone loss in the tissue-supported areas and the inherent problems associated with any bone loss. Unless finances are the determining factor, in my experience I have found that most patients would rather have a fixed implant-supported option( dental implant machine ).
From a fixed prosthetic standpoint, it seems that fewer screw-retained acrylic hybrid options are now being chosen and utilized as a treatment option. The success rate of zirconia as a screw-retained option has increased the use of zirconia for full-arch implant-supported prostheses. Zirconia, especially as a monolithic option, reduces and virtually eliminates the problems of porcelain chipping and the loss of teeth from the prosthesis.
While there might be slightly higher laboratory costs associated with the fabrication of a full-arch screw-retained zirconia prosthesis, these costs should be compared to the financial impact (and stress) for the clinician and patient that can result from fractured teeth seen often with acrylic and metal hybrids. There are other clinical benefits of zirconia versus acrylic. Zirconia, having the highest modulus of elasticity of any product available in dentistry along with its inherent low porosity and susceptibility to attract debris, allows for the observed high success rate with this prosthetic option. In addition to the cost of repairs, there is often a loss of patient confidence seen with hybrid acrylic bridges that can negatively affect the dental practice. Some thoughts when choosing among the different treatment options for a patient.
For teeth to move, a force must be applied to them in the direction of the desired movement. The force stimulates cells in the periodontal ligament to cause bone remodeling, removing bone in the direction of travel of the tooth and adding it to the space created. In order to generate a force on a tooth, an anchor point (something that will not move) is needed. Since implants do not have a periodontal ligament, and bone remodelling will not be stimulated when tension is applied, they are ideal anchor points in orthodontics. Typically, implants designed for orthodontic movement are small and do not fully osseointegrate, allowing easy removal following treatment.