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Removable Partial Denture Components > Rpd Components > Flashcards

Rpd Components Flashcards

1
Q

Major connector

A

Part of a rpd that joins the components one one side of the arch to the opposite side

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2
Q

5 rpd components

A 
Major connector
Minor connector 
Direct retainer
Indirect retainer
Base
Replaced teeth
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3
Q

Mandibular major connectors

A

Lingual bar
Labial bar
Lingual plate

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4
Q

Maxillary major connectors

A

Complete or modified palatal plate
Anteroposterior palatal plate
Anterior palatal strap

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5
Q

Lingual bar

A

6ga half pear shaped approx 4mm in height with superior border at least 3mm from fgm

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6
Q

Lingual plate

A

Used when fgm to floor of mouth is less than 7mm or anteriors are mobile and longevity is questionable

*30ga relief wax is used to make sure bar/plate doesnt contact tissue

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7
Q

Complete palatal plate

A

Posterior border must not impinge upon movable tissue

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8
Q

Modified palatal plate

A

Anterior border ends in valley of rugae not less than 6mm from fgm

  • wide application to all classes mostly 1&2
  • maximum support as plate rests on tissue
  • contraindicated where tori are present
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9
Q

Labial bar form and usage

A

Same as lingual bar but placed buccally due to severe lingual inclination or remaining teeth

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10
Q

Minor connector definition

A

Connecting link between major connector or base of a rpd

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11
Q

Requirements of a minor connector

A

Must be ridged

Must not impinge underlying mucosa and mucosal surface is highly polished

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12
Q

Usage or minor connector

A

Minor connector and rest junction must be at least 1.5mm thick

Try to place inter proximally

Joins major connector at right angle

Should be 5mm from other vertical components

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13
Q

Direct retainer

A

Component or rpd used to retain and prevent dislodgment consisting of a clasp assembly or precision attachment

Parts: reciprocal arm, occlusal rest, retentive arm

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14
Q

Reciprocal Arm

A

Component of clasp assembly specifically designed to provide reciprocation by engaging a reciprocal guiding plane; it counteracts action of clasp during removal and insertion or rpd

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15
Q

Function of reciprocal arm

A

Resists lateral movement of prosthesis and potential ortho movement

Types: horizontal

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16
Q

Retentive arm clasps

A
  1. Clasp designed to provide retention by engaging undercut

2. Flexible segment of rpd that engages undercut on a abutment and is designed to retain prosthesis

17
Q

Types of clasps (material undercut)

A
  1. Cast
    • circumferential
    • bar (INFRABULGE)
  2. Wrought
    • circumferential
18
Q

Types of clasps

A
  1. SUPRABULGE (occlusal approach)
    • cast
    • wrought
  2. INFRABULGE (gingival approach)
    • cast
19
Q

Denture base definition

A

Part of rpd that rests on foundation tissue and to which teeth are attached

20
Q

Denture base acrylic usage

A
  • can be in mand and max rpd classifications
  • relined of edentulous ridge area changes
  • attached to rpd framework via meshwork

**meshwork waxup on mand rpd is relieved off the ridge by using 24ga during block out of cast before duplication and waxing

21
Q

Denture base metal

A
  • used in class 3 or 4

- acrylic material associated w base is attached using small plastic beads at the time of base wax

22
Q

Denture base finish lines definition

A

Planned junction or different materials

Types: internal acrylic bases only

  • associates with junction between metal or rpd framework and acrylic base material
  • formed by 24ga relief wax used to provide space for denture acrylic

Type: external (acrylic and metal bases)
-external and internal finish lines when present are not placed opposite of each other to prevent fracturing of base

23
Q

Replaced teeth functions

A

Prevents movement of remaining teeth,
Restores masticatory efficiency, retain proper inter arch space, maintain aesthetics or facial contour, achieve distinct enunciation

24
Q

Types of replaced teeth material

A

Acrylic
Porcelain
Metal : gold and chrome

25
Q

Indirect retainer definition

A

Component of rpd that assists the direct retainer in preventing displacement of distal extension denture base by functioning through lever action on the side opposite of the fulcrum line when denture base moves away from tissues in pure rotation around fulcrum line

26
Q

Fulcrum line axis

A

An imaginary line connecting most distal occlusal rests around which a rpd tends to rotate TOWARDS tissues under masticatory forces

27
Q

Retentive fulcrum line axis

A

Movement of base AWAY from ridge around imaginary line connecting retentive clasp tips

28
Q

What ga is used for wires

A

19ga

Removable Partial Denture Components (1 decks)

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