Rpd 8-12 Columns

Front 1

does the edent ridge offer support for the RPD?

Back 1

no, abutment teeth absorb the forces

Front 2

how many impressions for tooth supported RPD (Kennedy III)

Back 2

one as long as ST is in anatomic form

Front 3

what does a corrected cast do

Back 3

captures teeth in their anatomic position and the residual ridge tissue in functional form

Front 4

3 requirements for corrected cast

Back 4

1) record and related tissues under uniform loading

2) distribute load over as large an area as possible

3) accurately delineate peripheral extension of denture base

Front 5

what type of bone displays an irregular surface that can irritate overlying ST when stressed

Back 5

cancellous

Front 6

5 factors influencing support of /de base

Back 6

1) quality of ST over ridge

2) type of bone in load bearing area

3) design of prosthesis

4) amount of tissue coverage of denture base

5) anatomy of denture bearing arch

Front 7

will the ridge give the denture base more or less support if its overlying ST is thick/displaceable

Back 7

less

Front 8

what ST covering of the edentulous ridge offers the greatest support for the RPD

Back 8

firm, tightly attached, moderate thickness

Front 9

2 improvements removal of redundant tissue, esp over max tuberosities, offers the RPD

Back 9

1) minimize vert displacement

2) improve resistance to lateral displacement

Front 10

cancellous or cortical bone: which is less able to resist vertical forces

Back 10

cancellous because irregular surfaces irritates overlying tissue

Front 11

where should you direct forces when considering bone

Back 11

dense cortical regions (buccal shelf)

Front 12

most efficient method of controlling rotational movement of a de

Back 12

use of one or more indirect retainers anterior to the fulcrum line

Front 13

if the RPD is a bilateral de (ken I) how many and where should ID retainers be

Back 13

one ID retainer on each side of the arch

Front 14

how many and where are the ID retainers placed in a unilateral de (kenn II)

Back 14

one, anterior to fulcrum line and on opposite sides of arch from the de

Front 15

if the de RPD denture base is overextended and impinges on movable tissues, ortho movement of teeth will occur where

Back 15

anterior to fulcrum lin

Front 16

max arch primary stress bearing area

Back 16

crest of ridge

Front 17

why can max arch vertical slop be used as a stress bearing area?

Back 17

not oriented perpendicular to vertical forces

Front 18

the max buccal slope resists what forces

Back 18

lateral

Front 19

what other part of the maxilla provides some resistance to displacement from vertical forces but is prone to ulceration since it is thin mucosa

Back 19

HP

Front 20

what must be done if the max crestal mucosa is not firm and dense

Back 20

surgical correction

Front 21

can the mandibular crestal ridge be used as a primary stress bearing area and why

Back 21

no it is cancellous bone

Front 22

mand primary stress bearing area for de..

Back 22

buccal shelf

Front 23

what provides vertical for resistance in the mandible

Back 23

buccal shelf, almost perpendicular to vertical forces

Front 24

what provides horizontal resistance in mand de

Back 24

buccal and lingual slopes of ridge

Front 25

why is it difficult to get the peripheral extension of the mand denture base recorded

Back 25

floor of mouth is distensible

Front 26

what other RPD type requires a dual impression technique

Back 26

long span anterior edentulous (6 teeth, Kenn IV)

Front 27

physiologic impression

Back 27

records the ridge portion of the cast in its functional form by placing an occlusal load on the impression tray during the impression procedure

Front 28

selected pressure impression

Back 28

intended to equalize the support between the abutments and ST

directs forces to the portions of the ridge that are most capable of withstanding force

done by relieving the tray in some areas and allowing the tray to contact the ridge in other areas

Front 29

in the selected pressure impression technique, areas where the tray is not relieved will have greater or less ST displacement

Back 29

greater displacement

Front 30

for the corrected cast impression, what is attached to the impression tray

Back 30

the RPD framework

Front 31

STs are _______ if insertion and wear of the prosthesis produces no adverse ST response

Back 31

minimally displaced

Front 32

what can occur as a result of excessive displacement of ST

Back 32

inflamm response and bone resorption

Front 33

McLean physiologic impression

Back 33

custom tray for edent area then put that custom tray into an impression tray with hydrocolloid and take full arch impression

Front 34

functional reline method

Back 34

adds new surface to the intaglio of the denture base

Front 35

when doing a reline, what is placed on the cast to allow for new material to be added

Back 35

thin layer of metal (ash's no 7 metal)

Front 36

in the mouth, what is used as the final impression material for the functional reline

Back 36

ZOE paste or light bodied polysulfide paste

Front 37

for the reline, when will occlusal discrepencies be correted

Back 37

after the processing of base

Front 38

when making an impression tray for the corrected cast procedure, what is used to make the new tray

Back 38

framework on the master cast and resin placed over the frame, then tried in the mouth

Front 39

when trying in the resin covered framework tray, the edge of the tray should be how far from the depth of the buccal vestibule in the pt's mouth

Back 39

2-3mm

Front 40

how far post should the mand tray reach

Back 40

2/3 height of retromolar pad

Front 41

overextended tray will cause what on abutment teeth

Back 41

constant force on abutment teeth as border tissues attempt to unseat denture

Front 42

2 border moldings that must be done on the de framework tray

Back 42

1) ant to pos of buccal flange

2) lingual and distolingual flanges

Front 43

proper border molding results in what

Back 43

tongue and other tissues move without dislodging tray

Front 44

3 objectives of fluid wax impression

Back 44

obtian max extension of peripheral borders w/o interfering with moveable tissues

record stress bearing areas of ridge in functional form

record non-pressure bearing areas in their non-functional form

Front 45

waxes that are firm at room temp and have ability to flow at mouth temp

Back 45

fluid wax

Front 46

will a thin or thick layer of fluid wax flow less readily

Back 46

thin is less ready

Front 47

fluid wax will not support itself beyond __mm

Back 47

2mm

Front 48

after 5 min fluid wax looks ___ in areas of tissue contact

Back 48

glossy

Front 49

how long must fluid wax impression be left in mouth

Back 49

12 min

Front 50

impression technique that seeks to direct forces to those portions of the ridge able to absorb stress and to protect areas of ridge least able to absorb stress (intaglio surface of tray is selectively relieved)

Back 50

selected pressure

Front 51

which are is relieved on a mand de tray

Back 51

posterior crest of ridge

(relieved down to metal, allowing for minimal tissue displacement during impression)

Front 52

impression material of choice if residual ridge is free of gross undercuts, or when flabby tissue is involved

Back 52

ZOE

Front 53

more or less viscous impression material results in greater tissue displacement

Back 53

less viscous

Front 54

good impression material for moderate to severe undercuts

Back 54

polysulfide rubber base

Front 55

what is done with the original master cast to make the final corrected cast

Back 55

old ridge is cut out

framework impression placed on remaining teeth and fixed wiht modeling plastic

bead and box to give 2-3 mm land area

Front 56

what should always accompany as master cast to the lab

Back 56

properly designed diagnostic cast

Front 57

what needs to be IDed on work auth

Back 57

1) MC to use

2) teeth to be clasped

3) type of clasp to use

4) amt of undercut each assembly egages

Front 58

blockout for tooth-tissue supported RPD (kenn I and II)

Back 58

parallel or tapered

Front 59

how far to place a finish line from an abutment

Back 59

1.5mm to ensure resin will not contact marginal gingiva

Front 60

what determines the ultimate fit of the framework as far as processing is concerned

Back 60

refractory cast expansion

Front 61

refractory materials are also called

Back 61

investments

Front 62

gypsum bonded refractory materials are called what type of investments and are used to cast what materilas

Back 62

low heat investments

type IV partial denture gold and ticonium

Front 63

cast made form what is the foundation for waxing and casting procedures

Back 63

refractory material

Front 64

why is the refractory cast trimmed within 6mm of proposed design

Back 64

gas escape during casting

Front 65

most critical part of design transfer to the refractory cast

Back 65

individual clasp position

Front 66

method of choice for RPD casting

Back 66

induction casting

Front 67

induction casting

Back 67

casting based on the electric currents in a metal core induced from a magnetic field

Front 68

electropolishing

Back 68

rough finishing where atoms of metal from rough projections on the framework go into solution before those on smooth areas do giving a satin-like finish

Front 69

what direction does wrough wire flex in

Back 69

all directions

Front 70

method of attaching w-w in a repair sitch

Back 70

embe din the resin

Front 71

when is w-w used

Back 71

interim RPD

transitional prosthesis

repair of fractured or distorted clasps

Front 72

most dependable method to attach w-w to RPD

Back 72

solder wire to the framework after framework is complete

Front 73

disadv of incorporating wire into wax up and casting metal to it

Back 73

adversely affects clasp longevity

Front 74

best way to attach w-w

Back 74

solder onto lattice work well away from area where it will flex

Front 75

twin-flex clasp method...

Back 75

provides flexible clasp that is less noticeable to pt by placing it in a measured undercut on a proximal surface of an abutment

Front 76

% of RPDs that do no fit on day of insertion

Back 76

75%

Front 77

tissue surface of framework should be finished to what texture

Back 77

fine matte

Front 78

2 requirements of internal and external finish lines on framework

Back 78

sharply defined and undercut to provide mechanical retention

Front 79

most impt quality of MC

Back 79

rigidity

Front 80

order of adjusting framework

Back 80

fit to teeth and tissues of supporting arch

occlusion adjusted

Front 81

when checking de framework, should pressure be placed over de area?

Back 81

no, it would cause framework to rock and give inaccurate disclosing wax readings

Front 82

most common areas of interferences

Back 82

shoulders of circumferential clasp

interproximal extensions of lingual plate

Front 83

when is a jaw relations record take

Back 83

after corrected cast procedure for Kenn I or II

Front 84

what is the desired occlusal scheme for c/c

Back 84

bilateral balanced

Front 85

what is the desired occlusal schedume for FPD

Back 85

disclude posterior teeth

Front 86

goal for RPD occlusal scheme

Back 86

establish and maintain harmonious relationship between oral structures and provide effective, esthetic mastication

Front 87

2 general arbitrary points for VDO measurement

Back 87

top of pt's nose to pt's chin

Front 88

2 important vertical dimentions

Back 88

physiologic rest

occlusal vertical dimension

Front 89

what determines the mand position in phys rest position

Back 89

muscle balance

Front 90

diff bt phys rest dimension and occlusal VDO

Back 90

2-4mm

Front 91

when should changin gth eVDO be considered

Back 91

when pt has significant VDO decrease

Front 92

greater than __mm should consider increasing VDO

Back 92

4,,

Front 93

generally, MIP is usually __ and ___ to CR

Back 93

anterior and inferior

Front 94

whip-mix condylar guidance is adjusted using what jaw relation records

Back 94

lateral

Front 95

frankfurt horizontal

Back 95

2 condylar locations and the lowest part of the bony orbit (orbitale to tragion)

Front 96

MC jaw relations medium

Back 96

polyether or polyvinylsiloxane

Front 97

the occlusal rim or opposing occlusal rims should have how much space interocclusally

Back 97

1mm

Front 98

inclination of the condylar guidance is dependent on what

Back 98

anatomy of the glenoid fossae

Front 99

estimating length of one central incisor

Back 99

divide pts chin to hairline distance by 16

Front 100

only time porcelain teeth are indicated

Back 100

when they oppose other porcelain teeth

Front 101

to determine arch length on a distal extension, measure from where to where

Back 101

mand: distal of natural canine to incline of mand ramus

max: dital of natural canine to mesial of tuberosity

Front 102

what is a mold consideration for posterior teeth

Back 102

choose slightly longer

Front 103

desired occlusal scheme when pt in MIP

Back 103

simultaneous bilateral posterior occlusal contact with all natural teeth occluding

Front 104

desired occlusal scheme for tooth bourne

Back 104

mutually protected, trying to avoid group funciton

Front 105

desired occlusal scheme for rpd/c

Back 105

balanced (bilateral simultaneous contact of ant and post in centric and eccentric)

Front 106

desired occlusal scheme for class IV rpd

Back 106

light contact with opposing natural

Front 107

4 times when jaw relations must be verified

Back 107

1) if accuracy of mounting is in question

2) rpd/c

3) all post teeth in both arches replaced

4) no opposing natural teeth, need verification of VDO

Front 108

verifications made at same or increased VDO

Back 108

slightly increased

Front 109

mand can maintain non-translating arc for what range

Back 109

10-20mm

Front 110

if baseplate wax used for jaw relations, when does mounting need to be done by

Back 110

30 min

Front 111

ging height is highest over which tooth

Back 111

canine

Front 112

what does waxing in a slight concavity bt the gingival bule and the periphery of the denture base do

Back 112

aides retention by giving area for cheek to fold into

Front 113

borders of tooth supported segments of rpd should be waxed __mm apical to the adjacent ging margin

Back 113

5mm

Front 114

split mold investing

Back 114

completed mold contains master cast and metal framework in one portion of denture flask and artificial teeth are in remaining portion of the denture flask

Front 115

amount of clearance bt occlusal surface of teeth and top of flasks middle segment

Back 115

15mm

Front 116

3 objectives of insertion appt

Back 116

1) eval correct fit of denture base

2) correct occlusion

3) adjust retentive clasps

Front 117

common area for denture bases to contact and require adjustment at delivery

Back 117

lateral walls of ridge and no contact on crest of ridge

Front 118

cheek biting caused by

Back 118

insufficient horizontal overlap of max and mand posterior teeth

Front 119

soft reline does what

Back 119

ease ST stress

Front 120

hard reline does what

Back 120

replace bone loss

Front 121

3 defect categories

Back 121

integrity

wear

reline

Front 122

6 things rpd alloy selection is based on

Back 122

weight

casting accuracy

availability/cost

versatility

clinical experience

mechanical properties

Front 123

5 mech properties when choosing rpd alloy

Back 123

hardness

yield strength

elastic modulus

fracture and fatigue strength

ductility (%elongation)

Front 124

what is the problem with a light casting alloy

Back 124

less accurate bc less weight to push metal into form when centrifuged

Front 125

inc this mech property and the clasps will engage in less undercut, you get more retention the less elastic deformation there is

Back 125

elastic modulus

Front 126

what is increased by increasing yield strength

Back 126

clasp deflects elastically more before plastically deformed, can engage more undercut

Front 127

if inc fracture strength

Back 127

alloy less likely to fracture or fatiguei

Front 128

f inc ductility there is less chance of...

Back 128

fracture during adjustment or fatigue

Front 129

stiffer means less or more elastic modulus

Back 129

less

Front 130

greater yield strength with ww or cast

Back 130

ww

Front 131

what does heating do to yield strength

Back 131

lowers

Front 132

hanau articulators are adjusted using what type of jaw relation records

Back 132

protrusive

Front 133

whip mix condylar guidance is adjusted using what jar relation records

Back 133

lateral

Front 134

inclinaiton of the condylar guidance is dependent on what

Back 134

anatomy of glenoid fossa