Posts Tagged ‘ mandibular ’
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
Cantilever Bridge, also known as Cantilever Fixed Partial Denture, is a prosthesis where the pontic (artificial tooth) is supported on one side only by one or more abutment teeth. The pontic is attached to a single or to two retainers splinted together but has no connection at the other end of the artificial tooth. The abutment tooth or teeth may be either mesial or distal to the edentulous space.
Photo 1: Cantilever Fixed Partial Denture with one abutment tooth
Fixed Moveable Fixed Partial Denture, as we define before, is a partial denture (bridge) with a rigid connector usually at the distal end of the pontic and a moveable connector that allows some vertical movement of the mesial abutment tooth. The movable connector (precision or semi-precision attachment) resists both separation of the pontic from the retainer and lateral movement of the pontic.
Segmented dental bridge has a fixed-fixed partial denture segment and a fixed movable partial denture segment.
Fixed movable partial denture is sometimes called as fixed free partial denture. It is a partial denture where the pontic is rigidly supported on one side, usually the distal end by one or more abutment teeth. On the other side, the abutment will contain a precision abutment, a stress breaking device. This will allow a small degree or limited movement between the rigid component and the other abutment tooth or teeth. This movable joint will give full support to the pontic against vertical occlusal forces, and will allow limited movement in response to lateral forces.
The advantage of fixed movable dental bridge is that both retainers do not need to be parallel.
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
A lower Unilateral Extension Fixed Partial Denture was fabricated with the purpose of restoring the center of occlusion, and create a premolar occlusion. The Cantilever Fixed Partial Denture design will also provide functional stability for the complete denture on the upper. It will also protect the anterior part of the maxillary ridge from excessive load or resorption.
Minimal occlusal preparation was done on both premolars. Selective grinding on maxillary denture was done to obtain balanced occlusion in the muscular contact position.
Unilateral Extension Fixed Partial Denture (abutments are 44 and 45, missing teeth are 46, 47 and 48 with only the first molar restored)
Cantilever Fixed Partial Denture
Tissue Supported Acrylic Denture is also commonly known as Gum Stripper. Tissue Supported Removable Partial Denture has been prescribed widely mainly because it is a Low Cost Prosthesis and easy to repair. When this type of denture is not maintained regularly, a problem arises. The Denture sinks into tissues as the underlying alveolar bone resorbs. This in turn strips the gingival tissues, leading to exposure of the underlying root surfaces. Tissue supported prosthesis especially in the lower jaw hastens the process of tooth loss.
Lower Tissue Supported Acrylic Removable Partial Denture - Occlusal Side