Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

REVISION BDS > pros > Flashcards

pros Flashcards

1
Q

CoCr indications

A

greater strength
more hygienic design possible

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

acrylic indications

A

temporary denture
poor OH or likely to have denture additions
cheaper
inadequate support from remaining teeth alone (need mucosa support too)

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

kennedy classification

A

anatomical classification that describes the number and distribution of edentulous areas present

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

kennedy class I

A

bilateral free end saddle

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

kennedy class II

A

unilateral free end saddle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

keneedy class III

A

unilateral bounded saddle

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

kennedy class IV

A

anterior bounded saddle
crossing the midline

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

craddock classification

A

simple classifciation based on support

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

craddock class I

A

tooth bearing
preferred - most comfotable, natural feeling (load transmitted via PDL)

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

craddock class II

A

mucosa bearing supporting

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

craddock class III

A

mixed - tooth and mucosa borne

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

support
definition

A

resistance to occlusal directed forces
prevents/resists movement and distributes load

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

support can be provided by

A

utilising hard tissues (teeth, bony undercuts) and large surface coverage (palate)

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

functions of rests

A
  • Oppose movement of denture base towards tissue (support),
  • help distribute/direct occlusal loads (down long axis of abutment tooth),
  • provide anterior bracing,
  • involved in reciprocation and indirect retention,
  • determine axis of rotation for free-end saddle RPDs
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

how should rests be placed

A

Kennedy I/II - not immediately adjacent to saddles (free end)
Kennedy III/IV - immediately adjacent to saddles (bounded)

Craddock I - on tooth surface nearest base
Craddock III - on tooth surface not closest to base

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

rests

A

Components that provide mechanical support. Extension of the denture onto a tooth.

Described by the part of the tooth that they contact.

Rests in CoCr are rigid and strong and connect to base via connectors.
PMMA rests are flexible and have poor strength and are mechanically incorporated within the base and loads can cause stress

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

features f mucosal supported denture

A

As large an area as possible, base must be 3mm from gingival margin to adduct for soft tissue compressibility

every partial denture - Entirely mucosa-borne. Restores arch with contact points, wire stops prevent distal drift of most posterior teeth. Gingival margins not covered

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

retention

A

resistance to vertical displacement.

Mechanical, muscular, physical

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

direct retention

A

esistance to vertical displacement of denture. Clasps, guide planes, soft tissue undercuts, precision attachments

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

direct retention

A

esistance to vertical displacement of denture. Clasps, guide planes, soft tissue undercuts, precision attachments

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

indirect retention

A

resistance to rotation displacement of denture. Provided by placing components to resist rocking

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

ideal pattern of retention

A

Triangular, with one point on opposite side of the arch

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

retainers

A

Components that resist displacement of the denture

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

indirect retainers

A

Resist rotation about the clasp axis by acting on the opposite side to the displacing force.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
fulcrum axis
Axis around which a tooth and Craddock III denture tends to rock when the saddles are loaded
26
mechanical retention ways to provide
Clasps and guide planes
27
guide planes and how do they work
Retention through friction. Supplementary direct retention. Two or more parallel surfaces on abutment teeth used to limit the PoI and improve retention and stability
28
what do altered PoI provide
retention
29
what do clasps do how to do they work
Provide retention by engaging the undercut of a tooth If the clasp arm is seated below the undercut
30
clasp efficacy depends on | 3
Material, cross-sectional thickness and shape, length
31
material and length for 0.25mm undercut
cast CoCr at least 15mm
32
0.5mm undercut material
wrought gold
33
0.75mm undercut
wrought strainless steel
34
how is muscular rentention achieved
action of surrounding musculature on the shape of the polished surface. Involves patient's muscular control and denture extension into sulcus
35
how is muscular rentention achieved
action of surrounding musculature on the shape of the polished surface. Involves patient's muscular control and denture extension into sulcus
36
how is physical retention achieved
Existing forces of **adhesion, cohesion, surface tension, atmospheric pressure. ** Includes closeness of adaptation, extent of base and peripheral seal
37
how is indirect retention achieved
Extension of the base to provide a fulcrum of a class II lever, preventing rotation. Stability for free-end/very long bounded saddle
38
reciprocation how to achieve
Movement/force of the opposing element to prevent pressure from the retentive clasp arm acting on the tooth (resistance to lateral movement). Provided via reciprocating (non-retentive) clasp arm (or reciprocal connector) above maximum bulbosity of the tooth remaining in contact with the tooth, prevent horizontal tooth movement caused by action of clasp flexing.
39
RPI system
Stress reliving clasp system. Used in Craddock III and commonly for Kennedy I/II. Used to reduce load on such teeth Mesial rest, proximal guide plate, gingivally-approaching I-bar clasp * As the saddle sinks into the denture bearing mucosa there is a rotation of the denture around the mesial rest * Both the distal guide plate and the I bar rotate downwards and mesially and disengage from the tooth * Potentially damaging torque avoided Retention, indirect retention (via proximal plate and minor connector) and reciprocation (if gap between plate and connector is less than width of tooth)
39
RPI system
Stress reliving clasp system. Used in Craddock III and commonly for Kennedy I/II. Used to reduce load on such teeth Mesial rest, proximal guide plate, gingivally-approaching I-bar clasp * As the saddle sinks into the denture bearing mucosa there is a rotation of the denture around the mesial rest * Both the distal guide plate and the I bar rotate downwards and mesially and disengage from the tooth * Potentially damaging torque avoided Retention, indirect retention (via proximal plate and minor connector) and reciprocation (if gap between plate and connector is less than width of tooth)
40
major connectors role types
connect components on one side of the arch to the other plate bar ring
41
space needed for lingual bar
8mm (3mm from gingival margin, 4 mm height of bar, 1mm clearance to Fom)
42
3 key anatomical features for complete dentures
Hamular notch * area between distal surface of tuberosity and hauler process of medial pterygoid plate; ideal site for distal border, * helps with post seal Retromolar pad * triangular pad of soft tissue at the posterior end of the lower edentulous ridge. * Support Retro-mylohyoid space * space at distal end of lingual sulcus, posterior to mylohyoid. * Aids in retention and stability
43
impression definition
reverse/negative form of the tissue
44
Cawood and Howell ridge classification
I. I - dentate; II - post-extraction; III - broad alveolar process; IV - knife-edge; V -flat ridge (no alveolar process); VI - submerged ridge (loss of basal bone)
45
what is support in C/C
Resistance to vertical movement of denture (occlusal directed forces).
46
ways support is provided in upper C/C | 2
hard palate, residual ridge
47
ways support provided in lower C/C | 3
residual ridge, buccal shelf, retromolar pad
48
retention
reistance to displacmeent in a vertical direction
49
3 ways to get retention
Peripheral seal, contact area between denture and tissues, denture extension, close fit, viscosity/volume of saliva** (adhesion cohesion)**
50
stability
Resistance to horizontal movement
51
ways to get stability
Stable/flat occlusal plane, denture teeth in neutral zone, correct denture extension.
52
neutral zone
Area where muscular displacing forces are in balance. Ideal tooth position where displacing forces of cheeks and lips are balanced with the opposing displacing forces of the tongue
53
6 ways to optimise retention and stablity of denture
Maximum extension of denture base, close adaptation to mucosa, teeth in neutral zone, correct shape of polished surfaces, good border seal, balanced occlusion
54
alginate | 5 properties
mucostatic, cheap, easy to use, elastic, poor tear resistance
55
impression compound | 3 properties
non-elastic, mucocompressive, difficult to use
56
polyether (impregum) | 3 properties
dimensionally stable very accurate, hydrophilic
57
occlusal stops
Allow accurate correction of posterior borders of tray by pre-forming impression material, improving peripheral seal
58
fucntion of border moulding
Full the functional sulcus (depth of sulcus during normal movement)
59
3 objectives of jaw registration
Determine occlusal plane and jaw relationship, define shape of maxillary rim and position of lower teeth select shade and mould of teeth
60
stages in jaw registration
measure RVD and OVD with willis bite gauge adjust upper record block to anterior and posteiror occlusal plane and check buccal corridors mark lip line, midline and canine line establish face height but adjusting lower block to upper identify lower tooth position take bite registration select appropriate tooth
61
assess during jaw reg
SOARE - Extension, retention, stability, occlusion, appearance. LIMBO - lip line, incisive level, midline, buccal corridor, occlusion Upper centrals 10mm anterior to incisive papilla, occlusal plane parallel to ala-tragus line
62
checks for delivery
Function, aesthetics, 3 denture surfaces, satisfactory occlusal contacts, extension, retention, stability, incisal plane orientation, occlusal plane orientation, OVD, porosity, undercut areas, sharp areas, comfort, looseness, appearance, speech, extension, retention, stability, occlusion, occlusal planes, OVD, FWS,
63
4 components of denture stomatitis (chronic pseudomembranous candidiasis)
Candidal infection, poor denture hygiene, night-time wear, high sugar intake, systemic factors (iron deficiency, steroid use, xerostomia). Mx - denture hygiene, miconazole gel to fitting surface, systemic fluconazole if indicated | nystatin if on statins or warfarin
64
4 components of denture stomatitis (chronic pseudomembranous candidiasis)
Candidal infection, poor denture hygiene, night-time wear, high sugar intake, systemic factors (iron deficiency, steroid use, xerostomia). Mx - denture hygiene, miconazole gel to fitting surface, systemic fluconazole if indicated | nystatin if on statins or warfarin
65
post dam helps in
Retention, stability
66
reasons for looseness | 8
Tori, flabby ridge, high renal attachment, recent extractions, incorrect peripheral extension, teeth not in neutral zone, unbalanced articulation, hyposalivation
67
reasons for pain | 12
Over-extension, blebs, residual monomer, poor fit, excessive post dam, retained roots, bruxism, premature occlusal contact, non-balanced occlusion, locked/wedged occlusion, rough fitting surface, errors in occlusion
68
eating problems
FWS, looseness, pain, chewing at side
69
speech problems
Incisors to palatal, incorrect OJ/OB, palatal PMMA too thick, lack of retention, reduced OVD
70
overdenture what adv disadv ideal abutments
Denture that derives support from one or more abutments or implants - seated over the top of these Preserve alveolar bone around retainer tooth, improved support, retention and stability, preservation of proprioception via PDL, psychological benefit of maintaining natural teeth RCT likely required, increased fracture risk, more maintenance required by patient and dentist, roots prone to caries, base may be required to be thinned to avoid excessive bulk in the region of the retained tooth Canines > molars > premolars > incisors Ideally bilateral and symmetrical with minimum of one tooth space between them; healthy attached gingiva, good perio support, no mobility

REVISION BDS (43 decks)

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