Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

BDS2 CDS Prosthodontics Removable > Connectors > Flashcards

Connectors Flashcards

(66 cards)

Start Studying
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
what do the wires in an every denture do
rely on maintaining teeth position, prevent drift so have frictional contact
26
mandibular connectors (5)
lingual bar with dental bar (continuous clasp) lingual bar Lingual plate (can be made to accomodate spaces between teeth) dental bar sub-lingual bar
27
continuous clasp
mandibular connector indirect retention the main connector is the lingual bar below
28
lingual bar
default connector for mandible Wrought stainless steel lingual bar used to avoid a plate on a lower arch
29
lingual plate
mandibular connector up onto cingulum of teeth, thinner, indirect retention can be used when cannot have lingual bar but cross gingival margin
30
dental bar
mandibular connector bulky to ensure rigidity, covers all cingulum nearly to the incisal edge, not wall tolerated, can move in function
31
sub-lingual bar
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
position of lingual bar
positioned at least 3mm below the gingival margin on the lingual side
33
space required for lingual bar
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
minor connectors
join component such as rests to the major connector. They transfer Functional stresses to and from the abutment teeth
35
4 guidelines for minor connectors
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
modification required to minor connector guidelines
Avoid multiple ‘windows’ – tongue feel , uncomfortable
37
anterior and posterior (ring) design bar positives (3)
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
anterior and posterior (ring) design bar disadvantages (3)
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
coverages of mucosal tissues by plates means
loss of natural sensation
40
advantages of plate design
thinner cross-sectional area less edges meaning more comfortable
41
disadvantages of plate
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
extension of major connector onto teeth surfaces provides
stability by resisting functional forces ina horizontal direction and bracing for denture particularly is there is a deep palatal vault
43
how can major connectors provide indirect retention
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
Uses of bead on the impression surface of maxillary dentures
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
what type of designs are better for patients oral health
open but not always advisable - need a closed design due to shape of teeth, reciprocating and supportive clasps
46
how do open designs benefit the patients oral health
facilitate the passing of saliva from lingual to buccal or buccal to labial – help maintain health of gingival margins
47
when would a closed design be used
due to shape of teeth, reciprocating and supportive clasps
48
features of a closed design
more contact, greater retention - guide planes possible increased irritation to gingival tissues
49
features of an open design
no gingival coverage, greater clearance possible reduced irritation to gingival tissues - every design
50
what is used to retain the acrylic flange and teeth to the metal base
mechanical retention
51
what is required on edentulous areas to check the fit and ensure the denture does not rotate
a stop
52
what can be used when vertical space is limited
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
what do you need to decide on when designing a denture with acrylic
whether it will lie directly onto tissue or is stepped from tissue - need to guide technician
54
tooth position impact on denture
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
what do you need to factor into denture design with regards to occlusion?
what do the artificial teeth occlude against - protect natural teeth getting pinged off denture post metal backing
56
natural occlusion
lower incisor occludes with the cingulum of the upper anterior teeth
57
when a post may be used in denture occlusion
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
when would a metal backing be used in denture occlusion
limited space between incisor teeth provides an occlusal contact - prevent pressure on the upper artificial tooth from de-bonding from the denture base
59
dimensions of rest
thickness = 0.5mm minimum | – 1mm at junction with minor connector
60
dimensions of sub-lingual bar
Height = 4mm, thickness = 2mm, oval or half pear shape
61
maxillary connectors clearance from gingival margin
5mm
62
bead position on maxillary connectors
0.5mm deep to 1mm wide | pin dam/food line
63
bars dimension (maxillary connector)
``` Width = 6mm, thickness = 1.5mm ```
64
cast claps dimensions (maxillary connector)
thickness 0.4mm minimum
65
minor connectors dimensions
``` width = 2m, thickness = 1.5mm ```
66
cast clasps dimensions
length 15mm to engage 0.25mm undercut

BDS2 CDS Prosthodontics Removable (10 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions