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REMOVABLE > major and minor connectors > Flashcards

major and minor connectors Flashcards

1
Q

that component of a partial denture which joins the minor connectors and their attached assemblies together to form a solid unit

A

major connector

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2
Q

3 important parts of major connector

A
  1. counter leverage
  2. cross-arch stabilization
  3. unification of components
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3
Q

bracing elements on one side of the arch providing stability to the other

A

cross-arch stabilization (counterleverage)

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4
Q

-function as one unit
-broad stress distribution
-reduce torque
-avoid tissue damage

flexibility=force concentration

A

rigidity

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5
Q

-should not enter undercut areas
-avoid by changing path of insertion or by using blockout

this is example of:

A

non-interference with tissues

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6
Q

with non-interference with tissues, avoid terminating on:

A
  1. free gingival margin
    -cross abruptly at 90 degrees
    -relief is used to minimize impingement
  2. lingual frenum and the movable soft palate
    -soft tissue movements must also be allowed
    -careful intraoral exam
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7
Q

minimize food impaction by

A
  1. locating margins away from the free gingival margin
    -elminate traps or large concavities food gets stuck
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8
Q

have unobtrusive, smooth transition from connector to denture which is known as

A

butt joint

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9
Q

line angles of edges should be:
borders should not interfere with:

A

smooth and rounded
speech

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10
Q

maxillary major connectors

borders are placed parallel to a minimum of ___mm from gingival margin.

is relief required?
how should sit on rugae?

A

6mm

no relief required
anterior borders follow valleys between rugae

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11
Q

with max major connector, anterior and posterior borders should cross at the midline at:

the borders are beaded how thick:

A

midline at right angle
0.75mm wide and deep

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12
Q

to avoid tissue impingement should be
___mm from gingival crest(for max)
___mm from gingival crest (for mand)
and cross at what angle to the gingival margin

A

6mm max
3mm mand
right angle

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13
Q

what are the 4 max major connectors

A

palatal strap
palatal plate
anterior-posterior strap
horseshoe or U

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14
Q

what are the indications of using a palatal strap for max connector?

A

-tooth supported situations like class III
-small posterior edentulous areas
-minimal tissue supported required
8-10 mm anterior to posterior

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15
Q

contraindications of using a palatal strap for max connector

A

-distal extensions like class I or II
-severe palatal undercuts
-large tori
-if need to replace anterior teeth
-when need tissue support

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16
Q

advantages and disadvantages of palatal strap

A

advantages
-good support and rigidity
-distribute stress of mastication over wider area

disadvantages
-coverage of palate may cause discomfort and interfere with phonetics

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17
Q

location of palatal strap

A

anterior border follows valley between rugae at right angle to median suture

posterior border at right angle to median suture

4 principle rests
8-10 mm wide??

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18
Q

indications of palatal plate

A
  1. long-span distal extension w or w/o anterior tooth replacement
  2. flat residual ridges
  3. periodontally weakened abutments
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19
Q

contraindications of palatal plate

A

tori

20
Q

advantages and disadvantages of palatal plate

A

adv
-optimum support and rigidity
-increases retention

disadv
-cant be used with tori
-covers palate and may diminish taste
-difficult to cast

21
Q

location of palate plate

A

-anterior border between rugae valleys and at right angle to median suture

-posterior border extends to junction of soft and hard palate

22
Q

what are the indications of anterior-posterior palatal strap

A

-have tori
-strong, widely separated abutments
-distal extension RPDs; distal extension RPDs also replacing anterior teeth

23
Q

what are the contraindications of anterior-posterior palatal strap

A

-if pt has high narrow vaults
-phonetic interference
-bulky straps

24
Q

adv for anterior-posterior palatal strap

A

adv
-minimal tissue coverage
-rigid
-straps in 2 planes

25
Q

the anterior-posteriors palatal straps width are:

and palatal opening to be beneficial, the space should be how wide:

the posterior strap distal extension should be to:

A

6-8mm
15mm open

to vibrating line and extended through hamular notches
-tooth supported not more posterior than distal abutment

26
Q

indications of horseshoe or U

A

**in a very high vault palate!
-large torus
-anterior tooth replacement
-pt is intolerant of palatal coverage

27
Q

contraindications of horseshoe or U shaped

A

-least rigid max connector; therefore anytime another connector may be used

28
Q

adv and disadv of horseshoe or u shaped

A

adv
can replace missing anteriors
conforms to pts previous experience

disadv
-requires additional bulk for rigid
-can interfere with speech
-even with rest may lack support causing tissue impingement

29
Q

location of horseshoe/u shaped

A

anterior borders:
terminates in valley of rugae at right angle to suture or cingulum of teeth extending contact point to contact point

posterior borders:
located at turning point of palate

30
Q

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

this produces a positive ____ on the major connector of the RPD

A

beading of the max cast

bead

31
Q

what are the functions of beading the max cast

A

-increased rigidity
-guide for finishing
-compensates for csating inaccuracies
-displaces soft tissue, preventing food/fluid collection

32
Q

what are the 3 mand major connectors

A

lingual bar
lingual plate
labial bar

33
Q

what are the indications of a lingual bar

A

whenever possible
-depth of at least 7mm measured from lowest point of gingival margins to floor of mouth is required!

34
Q

contraindications of lingual bar

A

-shallow floor of mouth and prominent frenum
-inoperable tori
-teeth in linguversion
-teeth need stabilization

35
Q

adv and disadv of lingual bar

A

adv: covers the minimum of the tissues

disadv: may be flexible

36
Q

location of lingual bar

A

superior borders 3-4mm inferior to free gingival margin

bar height 4-5mm

inferior border at height of lingual sulcus with tongue slightly elevated

37
Q

indications for lingual plate

A

[this is on teeth]
use this when cant use lingual bar

-if less than 7mm from gingival margins to floor of mouth

-future replacement of anterior teeth

-bilateral distal extension with flat residual ridges

38
Q

contraindications for lingual plate

A

-severely crowded anterior teeth
-prominent diastemas
-teeth in linguoversion

39
Q

lingual plate advantages

A

adv: more rigid than lingual bar

40
Q

location for lingual plate

A

superior border contacts cingula of anterior teeth extending from contact point to contact point

inferior border at height of alveolar lingual sulcus with tongue elevated

must be supported by rests at terminal ends

41
Q

indications of labial bar

A

lingually inclined anterior or posterior teeth

prominent superiorly located
inoperable tori

42
Q

that component of a partial denture which joins the major connector with other parts of the framework

A

minor connector

43
Q

minor connect joins:

to the major connector

A

-clasp assembly
-indirect retainers or auxiliary rests
-the denture base

44
Q

this serves as an approach arm for a vertical projection or bar type clasp

A

minor connector

45
Q

4 functions of minor connectors

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 major connector
-helps to resist lateral movement

46
Q

minor connector requirements

A
  1. rigid with minimal bulk
  2. located in embrasure
  3. triangular in shape
  4. thickest toward lingual
  5. joins major connector at right angle
  6. tapers to contact point
  7. smooth and rounded
  8. minimum of 5 mm between vertical connectors
47
Q

portion of framework that contacts the proximal side of the tooth, is also considered a minor connector

A

proximal plate

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