Resin Bonded Bridge, also known as Maryland bridge is a dental prosthesis constructed of a cast metal framework which is luted to the enamel of abutment teeth by an adhesive composite resin.
In situations where the abutments are unrestored.
It is a conservative restoration for missing teeth. Minimal tooth preparation is required. The retainer wings are attached to the abutments using resin cement.
Equipoise is balance of force design. It protects, preserves and strengthens abutment teeth while directing all masticatory forces down the long axis of the abutment tooth. Equipoise was designed by Roach in 1930. Roach concepts on Equipoise were later modified by European and North American dentists giving us similar clasps concepts with other names. It is designed for use on the palatal / lingual surface of the abutment.
The design creates forces along the long axis of the abutment tooth with passive retention. All clasping in this Removable Partial Denture System is designed intra-arch. In Equipoise Class II Lever design, an element of support, and contention and retention for the distal buccal surface of the abutment must be placed. The Class II lever design has the rest(fulcrum) opposite of the retentive tip of the clasp (resistance arm) and the denture base (the effort arm).
Principles of Equipoise Removable Partial Denture
1. Minimum strain to the abutment.
2. Greater retention.
3. Improved esthetics.
Criteria fulfilled by Equipoise Design of Removable Partial Denture
5. Built in Permanence
Spoon Design Removable Partial Denture is a simple acrylic denture to replace one or two anterior teeth usually the lateral incisor. It derives its support and retention from the ridge and palate.
Indications for Spoon Design Upper Denture
Is is indicated for patients who suffered the loss of one anterior tooth. There should be a wide well formed palate with sufficient anterior clearance between the lower incisors and the ridge – also known as denture space.
Cobalt Chromium Removable Partial Denture can be tooth supported or tooth and tissue supported prosthesis. It incorporates both strength and rigidity to resist deformation from highly complex stress fields during normal masticatory movements.
Removable partial denture treatment has six phases:
- Education of patient.
- Diagnosis, treatment planning, design, treatment sequencing and mouth preparation.
- Support for distal extension denture bases.
- Establishment and verification of occlusal relations and tooth arrangements.
- Initial placement procedures.
- Periodic recall.
Indications for Cobalt Chromium Removable Partial Denture
It is indicated for patients with good hygiene and high motivation to accept dental prosthesis. There must be a distribution of abutment teeth which have good bone support.
Removable Acrylic Partial Denture is a mucosa borne denture that conforms to a specific design to ensure gingival health. The construction of the denture follows the usual prosthetic technique. An accurate impression is required to establish the point contact between the teeth.
Indications for Acrylic Removable Partial Denture
It is indicated when replacement of missing teeth is necessary for short period of time such as for the sake of appearance while tissue is healing. Other indications include:
- space maintenance
- reestablishment of occlusal relationships.
- to condition teeth and residual ridges.
- interim restoration during treatment.
- to condition the patient for wearing a denture.
Fixed-Movable Dental Bridge, also known as Fixed Movable Partial Denture, is a dental prosthesis where the artifical tooth or teeth is rigidly supported on one side, usually on the distal end by one or more abutment teeth. On the other side, one abutment will have an intracoronal or extracoronal attachment which allows a small degree of movement between the rigid component and the other abutment.
Each abutment can be prepared independently. Consideration is given to the placement of precision attachment.
Indications for Fixed Movable Dental Bridge
When the abutment teeth are not parallel in relation to each other and the reduction needed to make them parallel would be highly destructive to the abutment teeth. The construction of large units of fixed bridge means that the complex task of parallel preparations is increased. The use of precision attachment for the separation of large uits into several smaller but manageable sections.
Fixed-Fixed Dental Bridge, also known as Fixed Fixed Partial Denture, is a dental prosthesis where the artificial tooth or teeth is supported rigidly on either side by one or more abutment teeth. It is indicated where missing teeth are bound by abutment teeth which arecapable of supporting the functional load of the missing teeth.
Fixed fixed bridge is a strong and retentive restoration for replacing missing teeth. It can be used for single or multiple missing with the abutment teeth splinted together. In splinted abutments, the design should allow access for oral hygiene.
Cantilever Dental Bridge, also known as Cantilever Fixed Bridge and Cantilever Fixed Partial Denture, is a dental prosthesis where the artificial tooth is supported on one side only by one or more abutment teeth. Cantilever FPD is indicated where the abutment tooth can carry the occlusal load of the artificial tooth and where the occlusion is protected against potentially damaging rotational forces. This type of fixed prosthesis is also used in Dental Implants.
This type of bridge is generally the most conservative design in terms of tooth preparation. There is no expected problem of paralleling abutment teeth during tooth reduction.
Spring Cantilever Bridge, also known as Spring Cantilever Fixed Partial Denture, is a prosthesis where the pontic supported by a connecting bar to the abutment tooth or teeth. This type of denture is placed where a patient has sound anterior teeth with one missing unit or where diastemas are present around an anterior missing unit.
The pontic in Spring cantilever FPD does not require support from adjacent teeth. Anterior teeth that are sound and might normally be prepared to support a pontic do not need to be involved. In spring cantilever bridge, posterior teeth are used for the for the support of the anterior pontic.