the removable partial denture

partial denture

a prosthesis that replaces one or more, but not all of the natural teeth and supporting structures. it is supported by the teeth or mucosa. it may be fixed or removable

removable partial denture

A partial denture that can be removed and replaced in the mouth by the patient.

interim denture

A denture used for a short interval of time to provide:

1. esthetics, mastication, occlusal support and convenience.

2. conditioning of the patient to accept the final prosthesis.

retention

Resistance to removal from the tissues or teeth

stability

Resistance to movement in a horizontal direction (anterior-posteriorly or medio-laterally)

support

Resistance to movement towards the tissues or teeth

upward

Direction of support in maxillary RPD

downward

Direction of support in mandibular RPD

downward

Direction of retention in maxillary RPD

upward

Direction of retention in mandibular RPD

abutment

A tooth that supports a partial denture.

retainer

A component of a partial denture that provides both retention and support for the partial denture

tooth supported partial dentures inadequate interarch space

indications of metal base

tooth tissue supported edentulous space (class i and ii), tooth supported edentulous space where bone resorption is expected

contraindications of metal base

accuracy and performance of form, comparative tissue response, thermal conductivity

advantages of metal base

esthetics, enhancement of retention not possible, difficulty of relining or rebasing, increased weight for a maxillary denture, good thermal conductor

disadvantages of metal base

resin base

type of rpd

• the plastic denture base has plastic in contact with the edentulous ridge. it is used more frequently than the metal base

metal base

type of rpd

• the metallic portion of the denture base forming a part or all of the basal surface of the denture

tooth tissue supported edentulous spaces, tooth supported edentulous spaces where bone resorption will necessitate a reline/rebase, where considerable missing alveolar tissue must be replaced

indications of resin base

single tooth edentulous spaces, where protrusive or lateral occlusal guidance will be on the prosthetic teeth

contraindications of resin base

esthetics, easy to repair

advantages of resin base

more porous than metal, easily damaged by abrasion or fractures, poor thermal conductibility, has the potential to be dimensionally unstable

disadvantages of resin base

unilateral rpd, bilateral rpd

classification of rpd according to location

unilateral rpd

classification of rpd according to location

• replace missing tooth or teeth in one side of the arch only (except for incisive class ii kennedy’s classification)

bilateral rpd

classification of rpd according to location

• replace missing tooth or teeth on both side of the dental arch

metal framework

is a part of the components of RPD. It is made up of either Gold (75% gold by weight) or Chrome Cobalt Alloys (30% Chromium and 70% Cobalt)

gold 75%, chrome cobalt alloys 30-70%

metal framework is made up of either — or —

mandibular class iii or iv rpd’s, maxillary class i-iv rpd’s as well as all modification areas

metal framework can be used in —

mandibular class i or ii rpd’s since it cannot be relined

metal framework cannot be used in —

small plastic beads

the acrylic material associated with the base in metal framework is attached using — at the time of base wax up

provisional denture

types of rpd

• It is a term used to designate temporary prosthesis made as an interim measure to help the patient become accustomed to an artificial replacement. same as temporary denture

temporary denture

types of rpd

• prosthesis used to provide patient with a tideover cosmetic facade until missing anterior teeth can be restored with a more definitive type of replacement

interim denture

types of rpd

• It is a dental prosthesis used for a short time for reasons of esthetics, mastication, occlusal support, or convenience, or for conditioning the patient to accept an artificial substitute for missing natural teeth until a more definite prosthetic dental treatment can be provided.

transitional denture

types of rpd

• Prosthesis that serve as temporary denture to which teeth will be added as more teeth are lost and that will be replaced after post-extraction tissue changes have occurred. It can become an interim denture when all teeth have been removed from the dental arches.

treatment denture

types of rpd

• Dental prosthesis used for treating or conditioning tissues that are called on to support and retain denture base.

butterfly partial denture

types of rpd

• A synonym for prosthesis that is usually temporary, claspless, and made of acrylic resin, and that replaces anterior and posterior teeth.

more esthetic, more dense surface which is hard, abrasive, resistant, less prone to stains and easier to clean

porcelain denture teeth porcelain denture teeth have the following advantages in comparison to plastic denture teeth:

minor connector

components of rpd

• unites the major connector with other parts of the denture

to transfer functional stress to the abutment teeth, to transfer the effect of the retainers, rests and stabilizing components to the rest of the denture

functions of minor connector

retainers

components of rpd

• it is any form of attachment applied directly to an abutment tooth used for fixation and retention of the prosthesis

direct retainers

types of retainers

• a clasp or attachment to an abutment tooth for the purpose of retaining RPD in place and limits the displacement of the RPD in an occlusal direction

extracoronal direct retainers

two types of direct retainer

• clasps

intracoronal direct retainer

two types of direct retainer

• precision and semi-precision attachment

indirect retainers

types of retainers

• any part of RPD framework which assist the Direct retainer in preventing displacement of an extension base by functioning through lever action on the opposite side of the Fulcrum Line

• It limits the movement of a denture base away from the tissue

• Prevents the rocking or see-saw movement of the free end denture cases

Restore the esthetic, phonetic and masticatory functions of the missing natural teeth, Transmit forces to the denture bases through which they may be distributed by the prosthesis to all teeth and tissues contacted by rigid parts of the denture, Maintain the integrity of the arch by supplying missing proximal contacts, Maintain the position of opposing teeth by supplying missing incisal and occlusal contacts

The functions of prosthetic teeth are to:

auxiliary occlusal rest, embrasure hook, major connects

Components that act as Indirect Retainers

rest

is a component placed on the abutment tooth in a prepared rest seat, so as to limit the movement of the denture in a gingival direction.

occlusal rest, incisal rest, cingulum or lingual rest

types of rest

proximal plate

It is a plate of metal in contact with the proximal surface of an abutment tooth to prevent the migration of teeth towards the edentulous area.

tissue stop

It is a metal projection arising below the mesh that contacts the underlying ridge to prevent the mesh from touching the cast during packing of resin. It is usually seen on distal extension cases.

finish line

It is a step-like preparation located on the edentulous space and serve as demarcation or junction between the metal and the acrylic portion to prevent feather edging of the resin material.

internal finish line, external finish line

types of finish line

major connectors, minor connector, retainers, clasps, proximal plate, tissue stop, denture base retaining element, metal slits

parts of metal framework

circumferential clasps, bar clasps

types of clasps

mesh, lattice, retentive pin

types of denture base retaining element

denture base

A — is that part of a denture which rests on the foundation areas and to which teeth are attached

denture base

is a supporting base for artificial teeth

denture base

some of the occlusal force distributed from artificially teeth is transferred to the edentulous ridge directly through the —