Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Removable Partial Dentures > Major and Minor Connectors > Flashcards

Major and Minor Connectors Flashcards

1
Q

what is the major connector

A

joins the minor connectors anf their attached assemblies together to form a unit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what does the major connector do

A
  • counter leverage
  • cross arch stabilization
  • unification of components
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

what does cross arch stabilization (counterleverage) do

A
  • bracing elements on one side of the arch providing stability to the other
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what are the requirements of major connectors

A
  • rigidity
  • location
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what does rigidity do

A
  • functions as one unit
  • broad stress distribution
  • reduce torque
  • avoid tissue damage
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

flexibility =?

A

force concentration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what should you avoid terminating on

A

free gingival margin
- lingual frenum and the movable soft palate
- soft tissue movement must be allowed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

how should you minimize food impaction

A
  • locate margins away from teh FGM
  • eliminate traps or large concavities where food can collect
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what does unobtrusive need to be

A

-smooth transition from connector to denture base- butt joint
- smooth line angles and edges
- borders should not interfere with speech

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what are the considerations for maxillary major connectors

A
  • borders are placed parallel to and a minimum of 6 mm from gingival margins
  • no relief required ecept where crossed gingival margin
  • anterior borders follow valleys between rugae
  • anterior and posterior borders cross midline at right angle
  • uniform thickness of metal
  • borders beaded: 0.75-1mm wide and deep
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

why does the border need to be beaded

A
  • displaces soft tissue, seals border to maintain tissue contact, provides additional strength
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what tissue impingmeents should be avoided

A
  • 6mm from gingival crest- maxillary
  • 3mm from gingival crest - mandibular
  • cross at right angles to the gingival margins
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what locations should be avoided

A
  • tissue impingement
  • ending on crests of rugae
  • irritation of surface eminences during insertion and removeal
  • ending on incisal 1/3 of anterior teeht
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what should be considered in maxillary major connector selection

A
  • palatal tori
  • anterior teeth replacement
  • anterior teeth stabilization
  • indirect retention
  • phonetics
  • patient attitudes
  • support
  • retention
  • stability
  • contigency planning
  • occlusion
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what are the types of maxillary major connectors

A
  • palatal strap
  • palatal plate
  • anterior posterior strap
  • horseshoe or “U”
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what are the indications for palatal strap

A
  • tooth supported situations- class III
  • small posterior edentulous areas
  • minimal tissue support required
  • patient preference
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

how thick should the palatal strap be

A

8-10 mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

when is the palatal strap contraindicated

A
  • distal extension situations- class I or II
  • severe palatal undercuts
  • large tori
  • RPD to replace anterior teeth
  • when support from palate in required
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

what are the advantages to palatal strap

A
  • excellent support and rigidity
  • distribute stress of mastication over wide area
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

what are the disadvantages of palatal strap

A

coverage of palate may cause discomfort and interference with phoentics

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

where is the palatal strap located

A
  • anterior border follows valley between rugae at right angle to median suture
  • posterior border at right angle to median suture
  • confined to area bounded by 4 rests
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

when is the palatal plate used

A
  • long span distal extension RPDs with or without anterior tooth replacement
  • flat residual ridges
  • periodontally weakened abutments
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

when is palatal plate contraindicated

A

severely undercut torus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

what are the advantages to palatal plate

A
  • optimum support and ridigity
  • increase retention due to increased interfacial surface tension
25
Q

what are the disadvantages to the palatal plate

A
  • can not be used with torus
  • coverage of the palate may diminish taste, interfere with phonetics, difficult to cast
26
Q

what is the location of the palatal plate

A
  • anterior border between rugae valleys and at right angle to median suture
  • posterior border: extends to junction of soft and hard paalte
27
Q

when is anterior posterior palatal strap indicated

A
  • circumvent torus
  • strong widely separated abutments
28
Q

when is anterior posterior palatal strap contraindicated

A
  • some maxillary designs due to narrow bulky straps
  • patients with high narrow vaults
  • phoenetic interference
29
Q

what are the advantages and disadvantages of anterior posterior palatal strap

A
  • advantages: structurally, very rigid straps in 2 plans, minimal tissue coverage
  • disadvantages: large amount of border area to blend
30
Q

where is the anterior posterior palatal strap located

A
  • anterior posterior straps - 6-8mm
  • for palatal opening to be beneficial the space between anterior and posterior straps should be 15mm
  • posterior strap: distal extension to vibrating line and extended through hamular notches
  • tooth supported not more posterior than distal abutment
31
Q

when are horseshoe or U shaped indicated

A
  • in very high vault palate
  • large inoperable torus
  • anterior tooth replacement
  • patient is intolerance of palatal coverage
32
Q

what are the advantages and disadvantages of horseshoe or U shaped

A
  • advantages: can be designed to replace missing anteriors, confroms to patients previous experience
  • disadvtanges: requires bulk for rigidity, can interfere with patients speech and tonuge, may lack support causing tissue impingement
33
Q

what is the location of horseshoe or U shaped

A
  • anterior border: terminates in the valley of rugae at right angle to suture or on the cingula of teeth extending contact point to contact point
  • posterior border located at the turning point of the palate
34
Q

what is beading of the maxillary cast

A

a prepared groove on the master cast along the designated borders of maxillary major connectors

35
Q

what are the functions of beading on the maxillary cast

A
  • increased rigidity
  • guide for finishing
  • compensates for casting inaccuracies
  • displaces soft tissue, preventing food.fluid collection
36
Q

describe the form of beading of max cast

A
  • 1/2 round bur
    -1 mm deep and 1.5 mm wide
  • feathers out to nothing 6mm from FGM
  • shallower over mid palatal suture
37
Q

how should you select for mandibular major connectors

A
  • mandibular tori
  • anterior tooth replacement
  • indirect retention
  • patient preference
  • lingual frenum and floor of mouth position
    -open embrasure between teeth
  • overlapping of anteriors
  • contingency planning
38
Q

what are the types of mandibular major connectors

A
  • lingual bar
  • lingual plate
  • labial bar
39
Q

when is the lingal bar indicated

A

whenever possible
- a depth of at least 7 mm measured from the lowest point of the gingival margin to the floor of the mouth is required

40
Q

when is lingual bar contraindicated

A
  • shallow floor of mouth and prominent frenum
  • inoperable tori
  • teeth in linguoversion
  • teeth require stabilization
  • RPD requires additional stabilization
  • RPD required benefit of additional indirect retention
  • contigency planning
41
Q

what are the advantages of lingual bar

A

covers the minimum of the tissues

42
Q

what are disadvantages of lingual bar

A

may be flexible if poorly constructed

43
Q

what is the location of the lingual bar

A
  • superior border 3-4mm inferior to FGM
  • inferior border at heigth of lingual sulcus with tongue slightly elevated
  • bar height is 4-5 mm
44
Q

when is lingual plate indicatde

A
  • insuficcient lingual vestibular space for lingual bar (less than 7mm)
  • anticipated future replacement of anterior teeth
  • bilateral distal extension eith flat residual ridges
  • presnece of mandibular tori
  • pt preference
45
Q

when is lingual plate contraindicated

A
  • adequate depth
  • prominent diastemas
  • severe anterior crowding
  • no additional requirement for indirect retenetion
  • pt preference
  • teeth in linguoversion
46
Q

are are advantages to lingual plate

A

more rigid than lingal bar

47
Q

what are disadvantages to lingual plate

A
  • covers teeth and tissue
  • compromised oral hygiene
  • more metal to fit, more difficult to fit the framework
  • esthetic with diastemas
48
Q

what is the location of lingual plate

A
  • superior border contacts cinugla of anterior teeth extending from contact point to contact point
  • inferior border at height of alveolar lingual sulucs with tongue elevated
  • must be supported by rests at terminal ends
49
Q

when is labial bar indicated

A
  • lingual inclined anterior or posterior teeth
  • prominent tori
50
Q

when is labial bar contraindicated

A

if tooth positioning will permit another connector

51
Q

what are advantages of labial bar

A

permits an RPD to be fabricated

52
Q

what are disadvantages of labial bar

A
  • hard to make
  • bulky to be rigid
  • not esthetic
  • traps food in vestibular area
53
Q

what is the labial bar location

A
  • superior border is at least 4 mm from buccal and labial FGM
  • inferior border is located at the junction of the attached and unattached mucosa
54
Q

what does the minor connector join to the major connector

A
  • the clasp assembly
  • indirect retainers or auxillary rests
  • the denture base
55
Q

what are the functions of the minor connector

A
  • transfers functional stress to abutments
  • transfers effect of retainers, rests and stabilizing components to the rest of the denture
  • unites retainers, rests and denture base to the major connector
  • helps to resist lateral movement
56
Q

what are the minor connector requirements

A
  • rigid with minimal bulk
  • located in embrasure
  • triangular in shape
  • thickest towards lingual
  • joins at major connector at right angle
  • taper to contact point
  • smooth and rounded
    -minimum of 5 mm between vertical connectors
  • cover minimal gingival tissue
  • cross gingiva at right angle
  • must not impinge on tissue
  • contact guiding plane surfaces
  • minimal interference with denture tooth placement
57
Q

what is the proximal plate

A

the portion of the frameowrk that contacts the proximal side of the tooth
- also considered a minor connector

58
Q
A

Removable Partial Dentures (21 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions