Brainscape's Knowledge GenomeTM

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


See full index

BDS2 CDS Prosthodontics Removable > Connectors > Flashcards

Connectors Flashcards

1
Q

connectors

A

A term used to describe the rigid part of a partial denture that unites other components.

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

standard lower connector

A

is lingual bar with minor connectors coming off

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

major connectors

A

part of the denture that connects components on one side of the arch to components on the other side of the arch.

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

major connectors provide

A

rigidity and stability

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

4 guidelines for major connectors

A

Be rigid. (No modifications to this rule)

Avoid covering gingival margins

Be comfortable, with as few edges as possible

Cover as little tissue as is consistent with rigidity. 
–  except for craddock class 3
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

6 modifications for major connectors

A

Base distribution

Need for tissue support

Need for indirect retention – only achievable on upper arch

Anatomical limitations – work round that, modify to accommodate

Prognosis of the dentition
– suspect few teeth unable to last lifetime of denture, can fracture in their loss, easy to add an additional tooth to the denture

Previous denture influence.
– if they are happy with the one they had, don’t try and make it ‘better’, take a long time to adapt to (musculature of mouth) as long as oral health is considered, give updated version of what they had if no harm caused

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

main types of major connectors

A

plate or bar

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

plate

A

a major connector that can be made thinner in cross-section and still maintain rigidity but covers wider area (either thin and broad or thick and narrow)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

when are plate designs the main option

A

mucosa supported RPDs (Craddock Class 2)

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

cross-sectional thickness of a plate

A

can be as little as 0.5mm thin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what can plate designs cover

A

gingival margins

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

when are plate designs recommended for mandibular arch

A

when no space is available for mandibular bar

as cover gingival margins

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

the thickness of a plate helps maintain

A

rigidity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

general rule, less tooth support means

A

more mucosal coverage

and then plates better than bars

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

advantage of bar connectors over plates

A

less mucosal coverage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

a bar connector is a type of

A

maxillary connector

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

thickness of bars

A

Must be made suitably thick in cross-section to maintain rigidity e.g. lingual bar (bulkier)

should be 2mm thick

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

when are bars common choice

A

craddock class 1 (tooth borne)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

why is a bar connector the default choice for the mandibular arch

A

as there is less space

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

when will there not be bars

A

on acrylic

never lower lingual bars on acrylic - won’t work

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

straps are

A

plates

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

choices for a maxillary connector (5)

A

anterior palatal strap

mid-palatal strap

posterior palatal strap

anterior and posterior strap

horseshoe

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

acrylic is

A

PMMA

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

3 categories of denture design

A

spoon

modified spoon

every

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

what do the wires in an every denture do

A

rely on maintaining teeth position, prevent drift so have frictional contact

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

mandibular connectors (5)

A

lingual bar with dental bar (continuous clasp)

lingual bar

Lingual plate (can be made to accomodate spaces between teeth)

dental bar

sub-lingual bar

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

continuous clasp

A

mandibular connector

indirect retention
the main connector is the lingual bar below

28
Q

lingual bar

A

default connector for mandible

Wrought stainless steel lingual bar used to avoid a plate on a lower arch

29
Q

lingual plate

A

mandibular connector

up onto cingulum of teeth, thinner,

indirect retention can be used when cannot have lingual bar but cross gingival margin

30
Q

dental bar

A

mandibular connector

bulky to ensure rigidity, covers all cingulum nearly to the incisal edge,

not wall tolerated, can move in function

31
Q

sub-lingual bar

A

mandibular connector

less aware of than dental bar as below tongue

need to record the functional floor of the mouth
- bulk of metal lying on base – not recorded well,
very uncomfortable for patient, hard to make accurately

32
Q

position of lingual bar

A

positioned at least 3mm below the gingival margin on the lingual side

33
Q

space required for lingual bar

A

approximately 8mm

3mm from gingival margin,
4 mm height of bar,
1mm
clearance to functional floor of mouth

– measure from gingival margin to floor of mouth around full extent of mouth

34
Q

minor connectors

A

join component such as rests to the major connector.

They transfer Functional stresses to and from the abutment teeth

35
Q

4 guidelines for minor connectors

A

Be rigid

Finish above (towards occlusal surface) the survey line on teeth

Cross the gingival margin at right angles (to maintain gingival health)
– acute angle can cause infection

Cover as little gingival tissue as possible

36
Q

modification required to minor connector guidelines

A

Avoid multiple ‘windows’

– tongue feel , uncomfortable

37
Q

anterior and posterior (ring) design bar positives (3)

A

contains all the theoretical principles advocated for a connector regarding

  • little coverage of gingival tissue (as skeletal design maintains gingival health without compromising rigidity)
  • rigid connector (hard to distort)
  • wide relief of gingival margins to prevent food impaction
38
Q

anterior and posterior (ring) design bar disadvantages (3)

A

the posterior bar offers less support to the free-end saddle across the hard palate (narrow coverage)

number of edges - some patients may find uncomfortable

greater cross-sectional thickness

39
Q

coverages of mucosal tissues by plates means

A

loss of natural sensation

40
Q

advantages of plate design

A

thinner cross-sectional area

less edges meaning more comfortable

41
Q

disadvantages of plate

A

coverage of mucosa surface

can be less rigid than ring design

can have several ‘windows’
- need to be sufficiently large for self-cleansing, so won’t pack food into
but alternative is to cover gingiva

42
Q

extension of major connector onto teeth surfaces provides

A

stability by resisting functional forces ina horizontal direction and bracing for denture

particularly is there is a deep palatal vault

43
Q

how can major connectors provide indirect retention

A

upper arch only
- sitting on hard palate, doesn’t compress greatly so can be utilised for support

resists movement about the axis of rotation

44
Q

Uses of bead on the impression surface of maxillary dentures

A

facilitate an intimate contact between the denture and the tissue that will prevent food ingression
(smell)

greater degrees of rigidity around the edge of the plate
- improve strength and rigidity of plate

45
Q

what type of designs are better for patients oral health

A

open
but not always advisable
- need a closed design due to shape of teeth, reciprocating and supportive clasps

46
Q

how do open designs benefit the patients oral health

A

facilitate the passing of saliva from lingual to buccal or buccal to labial – help maintain health of gingival margins

47
Q

when would a closed design be used

A

due to shape of teeth, reciprocating and supportive clasps

48
Q

features of a closed design

A

more contact, greater retention - guide planes

possible increased irritation to gingival tissues

49
Q

features of an open design

A

no gingival coverage, greater clearance

possible reduced irritation to gingival tissues

  • every design
50
Q

what is used to retain the acrylic flange and teeth to the metal base

A

mechanical retention

51
Q

what is required on edentulous areas to check the fit and ensure the denture does not rotate

A

a stop

52
Q

what can be used when vertical space is limited

A

a metal plate can contact the mucosa

but, design cannot be relined precisely due to the placement of internal finishing lines (particularly in the upper denture)

53
Q

what do you need to decide on when designing a denture with acrylic

A

whether it will lie directly onto tissue or is stepped from tissue
- need to guide technician

54
Q

tooth position impact on denture

A

Really influence shape of denture and position of acrylic in relation to teeth
- Need posts?

advisable to do a tooth trial before prescribing and manufacture of CoCr (after master impression and jaw registration)

Technician has patient agreed tooth position to guide them into finishing line of vertical posts of the saddle

55
Q

what do you need to factor into denture design with regards to occlusion?

A

what do the artificial teeth occlude against
- protect natural teeth getting pinged off denture

post
metal backing

56
Q

natural occlusion

A

lower incisor occludes with the cingulum of the upper anterior teeth

57
Q

when a post may be used in denture occlusion

A

when there is insufficient space for retention mesh in Co Cr base
- lower incisor is set with a space to avoid pressure on the artificial tooth

58
Q

when would a metal backing be used in denture occlusion

A

limited space between incisor teeth

provides an occlusal contact
- prevent pressure on the upper artificial tooth from de-bonding from the denture base

59
Q

dimensions of rest

A

thickness = 0.5mm minimum

– 1mm at junction with minor connector

60
Q

dimensions of sub-lingual bar

A

Height = 4mm,
thickness = 2mm,
oval or half pear shape

61
Q

maxillary connectors clearance from gingival margin

A

5mm

62
Q

bead position on maxillary connectors

A

0.5mm deep to 1mm wide

pin dam/food line

63
Q

bars dimension (maxillary connector)

A 
Width = 6mm, 
thickness = 1.5mm
64
Q

cast claps dimensions (maxillary connector)

A

thickness 0.4mm minimum

65
Q

minor connectors dimensions

A 
width = 2m, 
thickness = 1.5mm
66
Q

cast clasps dimensions

A

length 15mm to engage 0.25mm undercut

BDS2 CDS Prosthodontics Removable (10 decks)

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