Archive for the ‘ Removable Prosthodontics ’ Category
Equipoise Clasp 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.
Equipoise Clasp in Lower Removable Partial Denture
Conventional complete dentures are made by taking accurate impressions of maxillary and mandibular denture bearing areas and associated structures. Complete dentures replace all of the natural dentition and associated structures of the maxilla or mandible. It is entirely supported by tissues – mucous membrane, connective tissues and underlying bone.
Upper and lower complete dentures
Extracoronal Attachment is a type of precision attachment which involves two parts. The first half has a ball joint cantilevered from the abutment unit. The second part, is housed within the one piece casting framework. The attachment may involve a spring or an O ring or a similar component.
Extracoronal Attachment Retained Removable Partial Denture
Temporary Removable Partial Dental Prosthesis is incorporated into a total denture treatment plan for various reasons. Temporary removable partial dentures are typically made of acrylic resin with wire retention and may include other components to provide support.
Sometimes replacement of missing teeth is necessary for short period of time such as for the sake of appearance while tissue is healing. Various functions of temporary denture for the partial edentulism strive to achieve the temporary goals with minimum time and cost.
Maxillary Temporary Removable Partial Denture
Photo 1 shows a transitional removable partial denture for a patient whose oral hygiene and periodontal condition is very poor.
Flexible dentures are becoming very popular nowadays. They are marketed as permanent, unbreakable and retentive restorations. Flexible dentures cost is higher than traditional removable partial dentures, but many patients pay that extra because of esthetics. Dentures with flexible framework are undeniably more esthetically pleasing than dentures with metal framework. Another property of Flexible partial denture is it follows or flexes with the contour of your arch even when it’s ill fitting.
Lower Flexible Removable Partial Denture Occlusal - Case #4
Attachments for Removable Partial Dentures can be categorized into: intracoronal attachment or extracoronal attachment, rigid attachment or resilient attachment, and precision attachment or semi-precision attachment.
Let’s limit the discussion on the first 2 categories of attachments mentioned, the intracoronal attachment and extracoronal attachments. Intracoronal attachment for removable partial denture is either cast or attached totally within the natural contours of an abutment tooth or teeth. Typically, it is composed of prefabricated key and keyway with opposing parallel walls, which serve to limit movement and resist removal of removable partial denture through friction. The principle of internal attachment was formulated by Dr. Herman E.S. Chayes in 1906.
O-SO distal extension attachment male component on the proximal of the Fixed Partial Denture
Linguoplate is a type of major connector for Removable Partial Denture. Major connector is the component of partial denture that connects the parts of the denture located on one side of the arch with those on the opposite side. It is the unit of the denture to which all other parts are directly or indirectly attached. Linguoplate, also know as lingual plate, results if the rectangular space bounded by the lingual bar, the anterior tooth contacts ang cingula, and the bordering minor connectors is filled in.
Lingual plate upper border should follow the natural curvature of the teeth.
Overdentures have significant advantages compared with complete dentures. Some of these are:
1. Greater functional stability due to preservation of residual ridge contours
2. Better retention
3. Chewing efficiency
4. Less pressure on the mucosa
5. Reduced extension of denture base in the maxilla
Overdentures are complete dentures that are partially supported by natural teeth or implants. Overdentures are superior to conventional complete dentures in biting force, chewing efficiency and force discrimination.
Bar Connector
Equipoise is balance of force design. 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. E-clasps are designed on the mesial or distal aspect of the teeth facing the edentulous area. This is to reduce the lateral torque. There are no clasps on the buccal or lingual of teeth.
Principles of Equipoise Removable Partial Denture
1. Minimum strain to the abutment.
2. Greater retention.
3. Improved esthetics.
Equipoise Removable Partial Denture
Acrylic Resin Upper Removable Partial Denture - Occlusal
Acrylic resin removable partial denture with wire retainers is sometimes recommended for frail elderly patients. It is justified by the notion that acrylic resin is faster and easier to work with, affordable and amenable to repair. Acrylic resin prosthesis treatment is used because the remaining teeth are periodontally compromised, patients tend to exhibit poor oral hygiene and poor cooperation. Acrylic RPD can also be transformed if extractions become necessary.
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