Removable Partial Denture

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Removable Partial Denture
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Introduction

• Prosthesis
• Prosthetics
• Prosthodontics

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• Prosthodontics may be defined as that branch of
  dentistry pertaining to the restoration and
  maintenance of oral functions, comfort,
  appearance, and health of the patient by the
  restoration of natural teeth and/or the
  replacement of missing teeth and contiguous oral
  and maxillofacial tissues with artificial
  substitutes.

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Indications

• 1.Partial edentulous arch, specifically the
  distal-extension partial denture.
• 2.Immediate denture, temporary denture.
• 3.Partial edentulous individuals with the absent
  of alveolar bone, jaw and soft tissue.
• 4.Occlusal reconstruction.

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• 5.Removable periodontal splint.
• 6.Immediate surgical obturation (cleft of palate
  obturator).
• 7.Food impaction appliance.
• 8.Reluctance to grind more teeth.

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Contraindications

• 1.Psychopath
• 2.Patients were sensitive to crylic resin.

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Advantages

• 1. To be widely used
• 2. Tooth preparation very little
• 3. Made simply
• 4. Repaired easily
• 5. Excessive loss of bone and absent soft tissues
  may restore by RPD.

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Disadvantages

• 1.Unesthetic
• 2.Caries developed beneath clasp
• 3.Discomfortable
• 4.To grind food slowly

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Removable Partial denture types

• Base type
• Frame type

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• Tooth-borne type
• Mucosa-borne type
• Mixed-borne type

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The Component and Function of RPD
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Component

• Artificial teeth
• Denture Base
• Retainer Direct Retainer
• Indirect Retainer
• Connector

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Function
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Artificial Teeth

• Functions
• Types

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Types

• a.resin tooth
• b.porcelain tooth
• c.metal-resin tooth

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Resin tooth

• (?) ??
• ?????????????
• ????????????
• (?) ??
• ?????????????
• ??????
• (?) ??????

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Porcelain tooth

• (?) ????????????????
• ?????????
• (?) ??????????????
• ??????
• (?) ??????????????
• ?????
• ???????????,
• ????????

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Metal-resin tooth

• (?) ?????,????????
• ????????
• (?) ?????????
• (?) ????
• ????????????,
• ????,???????,
• ??????????

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Other types

• a.anatomic tooth
• b.non-anatomic tooth
• c.Semi-anatomic tooth

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Criteria for Selectingthe artificial teeth
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Area of anterior teeth

• 1. shape
• 2. size
• 3. color

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Area of posterior teeth

• 3D-space

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?????????

• ?????
• ?????

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Denture Base
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Functions of Denture Bases

• 1.????????,????????
• 2.??????,??????????????
• 3.???????????????,???????
• 4.?????????????

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Types of Denture Bases
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1.Resin bases

• (1)??
• ????,????,???,
• ????????
• (2)??
• ???,????????

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2.Metal bases

• (1)??
• ???,????,
• ???,??????
• (2)??
• ????????,?????

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3. Metal-resin bases

• ??????????????

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Denture Base Considerations

• 1.Border
• Tooth-supported partial denture base
• Distal extension partial denture base
• 2.Thickness
• 3.Location of attaching nature tooth
• 4.others

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???????????

• ???????
• ??
• ????

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Connector
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(?) Major connector

• Maxillary major connector
• Mandibular major connector

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1.Function

• connection
• rigidity
• To provide stability and help resist displacement

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2.Design criteria

• Made from an alloy compatible with oral tissues.
• Rigid and uses the principles of broad
  distribution of stress.
• Does not interfere with and is not irritating to
  the tongue.
• Does not substantially alter the natural contour
  of the lingual surface of the mandibular alveolar
  ridge or of the palatal vault.

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• Does not impinge on oral tissues when the
  restoration is placed, is removed, or rotates in
  function.
• Covers no more tissue than is absolutely
  necessary.
• Does not contribute to the retention or trapping
  of food particles.
• Has support from other elements of the framework
  to minimize rotation tendencies in function.
• Contributes to the support of the prosthesis.

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3.Types of maxillary major connectors
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Maxillary major connector(1)?? palatal bar

• a.????????,????6mm,
• ?1mm,?8mm?
• b.???????????,?????,
• ????????????,
• ?11.5mm,?3.5mm?
• c.???????????,????5mm,
• ?11.5mm,?33.5mm,
• ?????????

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(2)?? palatal plate

• ????????
• ??? ???
• ?????? ??????
• ?????
• ????
• ???????? ???

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4.Types mandibular major connector
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Mendibular major connector(1)?? lingual bar

• a.???????????????????
• ??????,
• ?5mm??2mm????4mm,
• ???????
• b.????
• c.?????????????????????
• ??????????
• ?????????,?????
• ???????0.30.4mm
• d.????,???

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(2)?? lingual plate

• ???????,????????????
• ????????????????????
• ????
• a.????????????
• b.???????????????????
• c.?????????????

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(3)??(??) buccal (Labial)bar

• ????3mm
• ?????????????,
• ????????????

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(?) minor connector

• Minor connectors are those components that
  serve as the connecting link between the major
  connector or base of a removable partial denture
  and the other components of the prosthesis, such
  as the clasp assembly, indirect retainers,
  occlusal rests, or cingulum rests.

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• Functions
• 1.To transfer functional stress to the
• abutment.
• 2.To transfer the effect of the
• retainers, rests, and stabilizing
• components to the rest of the
• denture.

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Location

• A minor connector contacting the axial
  surface of an abutment should not be located on a
  convex surface instead it should be located in
  an embrasure where it will be least noticeable to
  the tongue.

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Summary
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Review

1. Is the primary purpose of a denture base related
   to masticatory function? If so, how?
2. Define the term major connector in your words.
3. There are basically four types of maxillary major
   connectors. Name and describe them.
4. Give 3 types of mandibular major connectors.
   Describe them characteristics.