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d b review > 34. Dental Materials/ Prostho (CD) > Flashcards

34. Dental Materials/ Prostho (CD) Flashcards

1
Q

Example of Inelastic Imp matl

A

Plaster of paris

used as impression plaster before

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2
Q

Example of ELASTIC Imp Matls

A

Colloidal soln
Zoe
Imp compound
Elastomers

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3
Q

Reversible hydrocolloids used in lab for duplication. From seaweeds.

A

Agar agar

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4
Q

BQ: Imp material that uses specialized equipment

A

Agar

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5
Q

Unique property of agar agar.
—ability of matl to change its form based on temperature
(Liquefaction/gelation)

A

Hysteresis

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6
Q

Property of agar agar to absorb water = expansion

A

Imbibition

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7
Q

Property of agar agar to release water = shrinks

A

Syneresis

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8
Q

BQ: Principal content of agar agar

A

Water

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9
Q

Hardener of agar agar

A

Borax

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10
Q

Least exp/cheapest imp matl
Fastest setting time
LEAST DIMENSIONALLY STABLE

A

Alginate or Irreversible hydrocolloids

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11
Q

BQ: Flexites is made of

A

Nylon

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12
Q

BQ: Major reactor of alginate

A

Sodium alginate or Potassium Alginate

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13
Q

Reactor of alginate

A

Calcium sulfate

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14
Q

BQ: Filler of Alginate

A

(Sa boards: SILICA!!!!)

* diatomaceous earth

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15
Q

Retarder of alginate

A

Sodium phosphate

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16
Q

BQ: Principal component of alginate

A

Diatomaceous earth

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17
Q

“Set alginate”

A

Calcium alginate

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18
Q

Ways to DECREASE SETTING TIME (faster set)

A

Inc water temp (hot/warm)
Mix rapidly (more friction=more heat)
Decrease water:powder ratio (thick)

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19
Q

BQ: what happens if you add a drop of liquid in ZOE

A

Decrease setting time (faster set)

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20
Q

BQ: Eugenol is derived from what oil?

A

Oil of cloves

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21
Q

Has obtundent effect on pulp; used for tx of dry socket

A

Eugenol

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22
Q

What are contraindicated with RESINS

A

Cavity varnish

Eugenol

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23
Q

BQ: How many coats of cavity varnish applied

A

1-2 coats

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24
Q

BQ: How long will the cavity varnish seal dentinal tubules

A

Short term

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25
Q

Imp compound or modelling compound/cake can be softened by:

A

Dry heat - torch—best

Water bath —most common

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26
Q

Examples of ELASTOMERS (PSP)

A

Polysulfide
Silicones
Polyether

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27
Q

Elastomers with longest setting time, foul odor, stains

A

Polysulfide

Stains and foul odor bec of lead peroxide

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28
Q

Least dimensionally stable AMONG ELASTOMERS

A

Condensation silicone

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29
Q

Least dimensionally stable Among ALL IMP MATLS

A

Alginate

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30
Q

Most dimensionally stable among elastomers

A

Addition silicones

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31
Q

Most expensive and accurate: used in FPD

A

Polyether

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32
Q

Chemical name of gypsum products

A

Calcium sulfate hemihydrate

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33
Q

Plaster of paris is aka

A

Beta calcium sulphate hemihydrate

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34
Q

Type I gypsum

A

Impression plaster

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35
Q

Type II gypsum

A

Model plaster

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36
Q

Type III gypsum

A

Dental stone

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37
Q

Type IV gypsum

A

High strength stone or die stone

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38
Q

Dental stone is aka

A

Alpha calcium sulphate hemihydrate

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39
Q

Open kettle

Irreg and porous particles

A

Plaster of paris

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40
Q

Closed kettle

Regular and lesser porous particles

A

Dental stone

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41
Q

+ Calcium Chloride

Larger regular particles and denser than dental stone

A

High strength or die stone

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42
Q

BQ: All of the ffg will happen when water:powder ration is increased, except:

A. Produce thinner mix
B. Slow setting time
C. Stronger mix
D. Dec expansion

A

C. Stronger mix

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43
Q

BQ: Among the 3 gypsum products, which has the highest setting expansion?

A. POP
B. Dental stone
C. Die stone
D. Same

A

A. Plaster

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44
Q

Gypsum retarder:
—delays setting time
⬆️ setting time (para hndi mabilis magset)

A

Borax

Na citrate

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45
Q

Gypsum accelerator:

⬇️ setting time = faster set

A

Gypsum
KSO4
NaCl

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46
Q

Investment for CAST GOLD

A

Gypsum bonded investment

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47
Q

Investment for cast cobalt chromium

A

Phosphate bonded investments

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48
Q

Binder in investing material = binds heat

A

Gypsum

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49
Q

Refractory material = resists heat

A

Silica

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50
Q

Process of ⬆️⬆️⬆️ temp

A

Burn out

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51
Q

Using centrifugal force = mold space

A

Casting process

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52
Q

Type of wax used in inlays, crowns, rpd wax, casting wax

A

Pattern wax

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53
Q

BQ: Principal component of pattern waxes

A

Paraffin

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54
Q

Type of wax used in master cast construction. Boxing wax, sticky wax, utility wax

A

Processing wax

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55
Q

Ideal thickness of base of the master cast

A

16mm

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56
Q

Type of wax: bite wax

A

Corrective wax

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57
Q

BQ: 3 most common natural waxes used in dental waxes are

A

Paraffin
Beeswax
Carnauba

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58
Q

BQ: Have the HIGHEST CTE among all dental materials

A

Waxes

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59
Q

Tendency of a molecule to expand or shrink depending on the temperature

HOT: expands / COLD: shrinks

A

Coefficient of thermal expansion = highest in waxes!!!!

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60
Q

Highest CTE among restorative materials

A

Unfilled resin (80)

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61
Q

CTE of teeth is close to GOLD

A

Teeth - 11

Gold - 14

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62
Q

Exposure of walls of preparation to a fluid or mov’t of fluid in a passageway

A

Percolation

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63
Q

BQ: The best way to PREVENT WARPAGE OF PATTERNS is to?

A

Invest immediately

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64
Q

BQ: If wax cannot be invested immediately within 30mins, what is the best thing to do to preserve its dimensions?

A

Refrigate

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65
Q

aka Precious metals

Ex. Silver, platinum, titanium, palladium

A

High noble

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66
Q

Aka semi precious metals

A

Noble

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67
Q

aka non precious metals

A

Base

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68
Q

resistance to breaking UNDER COMPRESSION

A

Compressive strength

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69
Q

resistance to breaking UNDER TENSION

A

Tensile strength

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70
Q

resistance to breaking UNDER HORIZONTAL FORCES

A

Shear strength

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71
Q

Maximum stress BEFORE FRACTURING

A

Ultimate tensile strength

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72
Q

Most important, resistant to permanent deformation

NiTi > Ss wires

A

Yield strength

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73
Q

Rigidity or stiffness

A

Modulus of elasticity

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74
Q

Important for WEAR CHARACTERISTICS and Finishing

Porcelain > Gold > Acrylic

A

Hardness

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75
Q

Process of joining two pieces of metal together through the use of lower fusing intermediate metal

A

Solder

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76
Q

Primary requirement para maging successful yung soldering

A

Cleanliness

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77
Q

Fusion temp in soldering

A

100-150 F

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78
Q

Optimal space for solder

A

0.25mm

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79
Q

Added to metal surface to IMPROVE FLOW of the solder, DISSOLVES OXIDES and prevent contamination

A

Flux

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80
Q

Placed around the area that is to be soldered to RESTRICT FLOW

A

Antiflux

81
Q

BQ: Most common anti flux?

A

Soft graphite pencil

82
Q

“Blue flame” ; excessive oxygen; produces oxides

A

Oxidizing flame

83
Q

Low oxygen; produces CARBON in metal ( candle = black smoke)

A

Reducing flame

84
Q

BQ: What flame is best to use with cast gold restorations?

A

Reducing flame

85
Q

Principal component of porcelain; acts as matrix

A

Feldspar

86
Q

Filler of porcelain;

Provides skeleton and strength

A

Quartz

87
Q

Clay that acts as a binder, opaquer and flux in porcelains

A

Kaolin

88
Q

Property of porcelain making it brittle

A

⬆️⬆️⬆️ Compressive strength = Brittle!!!!

89
Q

Saturation of hue

A

Chroma

1/2/3

90
Q

Lightness/whiteness or darkness/blackness

A

Value

1/2/3

91
Q

Actual color

A

Hue

a, b, c

92
Q 
Darker = _ chroma
Lighter = _ chroma
A 
Darker = ⬆️ chroma
Lighter = ⬇️ chroma
93
Q

BQ: what is the phenomenon in which 2 objects appear to be the same color in a specific light source and appears different in another light source?

A

Metamerism

94
Q

BQ: best light source?

A

Sunlight or natural light

95
Q

BQ: Most important dimension of color in dental restorations?

A

Hueeee 💜

96
Q

Gold standard of cements

Oldest and most commonly used

A

Zinc phosphate cements

97
Q

Other name for Zn phosphate cements

A

“Zn oxyphosphate and bridge cement”

98
Q

BQ: Frozen slab technique

To inc setting time of?

A

Zinc phosphate cement

99
Q

BQ: Liquid component of zinc phosphate cements

A

Orthophosphoric acid (H3PO4)

100
Q

BQ: Most acidic cement

A

Silicate cement

101
Q

BQ: Only cement that is BASIC

A

Calcium hydroxide

102
Q

BQ: pH of ALL CEMENTS WHEN FRESHLY MIXED

A

All cements are ACIDIC when freshly mixed

Once set= pH neutral
Setting time: 24-48hrs
Normal sensitivity 1-2days after cementation of restoration

103
Q

Most soluble cement

A

Silicate cement

104
Q

Least soluble cement

A

GIC

105
Q

BQ: ADA spec of GOLD

A

Ada spec #5

106
Q

BQ: Ada spec of Amalgam

A

ADA spec #1

107
Q

Liquid has obtundent effect on pulp

Inhibits polymerization of resins

A

ZOE

108
Q

BQ: First cement that bonds to tooth structure (CHEMICAL BONDING)

A

Zinc polycarboxylate

109
Q

Retention of Zinc phosphate

A

MECHANICAL RETENTION

110
Q
  1. FIRST cement to produce FLUORIDE
  2. MOST SOLUBLE / MOST ACIDIC
  3. First mat’l used in “ESTHETIC DENT”
A

Silicate cements

111
Q

aka zinc silicate cement

A

Zinc silicophosphate cement

112
Q

GIC is aka

A

“Aluminosilicate cement”

113
Q

BQ: principal fluid of GIC

A

Polyacrylic acid

114
Q

GIC is derived from what cements:

Fluoride releasing / chemical bonding

A

Silicate cement - Fluoride releasing

Zinc polycarboxylate - chemical bonding

115
Q

Type I Gic

A

Luting

116
Q

Type II GIC

A

Resto

117
Q

Type III

A

liners and bases

118
Q

Type IV GIC

A

PFS

119
Q

Type V GIC

A

Orthodontic cement

120
Q

Type VI gic

A

Core build up

121
Q

Type VII gic

A

Fluoride release

122
Q

Type VIII gic

A

ART

123
Q

Type IX gic

A

Pediatric purpose

124
Q

Class I articulator is aka

A

Simple hinge

125
Q

Class II articulator is aka

A

Standard mean value

126
Q

BQ: use average “ANATOMY LANDMARK” to approximate the actual hinge

A

Arbitrary

127
Q

BQ: “ACTUAL HINGE” can be located using this facebow: more accurate

A

Kinematic

128
Q

IOR made with wax

A

Bite registration

129
Q

Most common IOR; mount the rel of mn cast to mx cast in Centric relation

A

Centric occ record

130
Q

Most inferior portion of upper lip

A

Lip line

131
Q

Location of incisal plane of maxillary teeth during SMILING;

Must follow the contour of lower lip

A

Smile line

132
Q

Measured from base of nose to lip line

A

Lip length

133
Q

horizontal reference for the orientation of maxillary teeth and incisal or occ plane

A

Interpupillary line

134
Q

Ala tragus line is aka

A

Camper’s line

135
Q

BQ: What part of tragus is used in ala tragus line

A

Superior part of tragus

136
Q

BQ: Importance of Camper’s line

A

Esthetics

137
Q

Starts from canine to molars
Seen in natural dentition only not in dentures (bec it may cause instability)

Convex - Mx
Concave - Mn

A

Curve of spee

138
Q

Starts at distal of 1st molars

Seen in dentures

A

Compensating curve

139
Q

Lingual inclination of Mandibular molars

A

Curve of wilson

140
Q

Space between posterior teeth during protrusion

A

Christensen’s phenomenon

141
Q

Motor speech production

A

Initiator = broca’s area

142
Q

Improves quality of sound

Oral, nasal, pharyngeal cavities, sinuses

A

Resonators

143
Q

Mechanism for speech production:

A 
Initiator- broca’s area
Motor - lungs
Vibrator- vocal cords
Resonators
Articulators - lips, tongue, soft hard palate and teeth
144
Q

FricatiVes

A

FV

145
Q

linguoDeNTaL

A

D N T L

146
Q

SibilantZ

A

S Z

147
Q

Bilabial

A

BPM

148
Q

BQ: What letter has the closest speaking space

A

S

149
Q

Space in between maxilla and mandible when the mandible is at rest

A

Freeway space

150
Q

Freeway space is aka

A

Interocclusal distance

151
Q

VDR - VDO = FS

Ideal measurement of FS =

A

2 to 4mm

152
Q

“Most posterior and superior” position of the condyle within the glenoid fossa

A

Centric relation

153
Q

Centric relation is aka: (3)

A

Retruded contact position
Ligament guided position
Bone to bone contact

154
Q

Complete intercuspation of opposing teeth independent of condylar position

A

Centric occlusion

155
Q

Centric occlusion is aka (2)

A

Tooth guided position

Maximum intercuspal position

156
Q

Position of mandible at physiologic rest

aka “Muscle guided position”

A

Resting position

157
Q

“Ligament guided”

A

CR

158
Q

“Tooth guided”

A

CO

159
Q

“Muscle guided”

A

RP

160
Q

Indicated for teeth without adequate tooth structure to develop a ferrule

A

Crown lengthening

161
Q

Minimum exposed tooth structure to have FERRULE

A

1.5-2.0mm

162
Q

Better than crown length because gingiva is still the same / using ortho

A

Forced eruption

163
Q

Source of Autografts in the body? In the oral cavity?

A

Body: iliac crest

Oral cavity: tuberosity

164
Q

Palatal tissue under a poor fitting denture base that is kept at night

A

Inflammatory papillary hyperplasia

165
Q

Inflammatory FIBROUS hyperplasia is aka

A

Epulis fissuratum

166
Q

BQ: Px wants to have a denture but does not want to have surgery to remove flabby tissue; what type of impression technique should you do?

A

Passive impression

167
Q

Complication of torus palatinus removal

A

Nasal cavity penetration

168
Q

Major conn used in RPD if px has torus palatinus

A

Horse shoe

169
Q

Major conn used if px has Torus MANDIBULARIS

A

Labial bar or “swing lock major connector”

170
Q

BQ: indication for labial bar

A

Severe lingually tilted tooth

171
Q

Burning sensation in the mandibular ridge

A

Pressure on the mental foramen

172
Q

Burning sensation on the palatal area

A

Pressure on the incisive foramen

173
Q

Clicking of denture teeth

A

Excessive VDO

Porcelain teeth

174
Q

Cheek biting

A

Not enough horizontal overlap of posterior teeth

Insuff VDO

175
Q

Mucosal changes

A

Vit c def

176
Q

“Accepts” dentist’s judgement and instruction

A

Philosophical

177
Q

BQ: asks alot of “questions”; demanding

A

Exacting

178
Q

Doesnt care about dental tx

A

Indifferent

179
Q

Emotionally unfit to wesr dentures

A

Hysterical

180
Q

Direction of ridge resorption in the MAXILLA

A

Superior and posterior

181
Q

Direction of ridge resorption in the MANDIBLE

A

Inferior and anterior

182
Q

“ah line” or “cupid’s bow” or BRA

A

Vibrating line

183
Q

Imaginary line demarcating the movable and non movable tissues of the soft palate
(2mm anterior to fovea palatini)

A

Vibrating line

184
Q

The posterior border of mx complete denture that puts pressure on the displacement tissue near the junction of the hard and soft palate (For: SEAL & RETENTION)

A

Posterior palatal seal (denture)

“Post dam” (cast)

185
Q

Resistance of denture to LATERAL forces

A

Stability

186
Q

Resistance of denture to forces DIRECTED AGAINST the tissues

A

Support

187
Q

Resistance of denture to DISLODGEMENT from the ridge

A

Retention

188
Q

Primary stress bearing area in the MAXILLA

A

Hard palate

Residual ridge

189
Q

Primary stress bearing area in the MANDIBLE

A

Buccal shelf

190
Q

Secondary stress bearing area in the MAXILLA

A

Rugae

Mx tuberosity

191
Q

Secondary stress bearing area in the MANDIBLE

A

Slopes of the residual ridge

192
Q

Denture that is delivered immediately following extraction

A

Immediate dentures
Disadv: Maluwag na
Reline after 6 months!

193
Q

Denture Partially retained, supported, stabilized with natural teeth or implants

A

Overdentures

194
Q

Tissues are compressed during impression to stimulate the same amount of pressure

A

Pressure / functional

195
Q

Impression at rest without any pressure

A

Non pressure or mucostatic imp

196
Q

BQ: Type of impression technique used in FLABBY TISSUE

A

Passive impression (a type of non pressure or mucostatic)

197
Q

Best suited for withstanding forces of mastication (custom tray used)

A

Selective impression

198
Q

Adding a new layer of material in the denture base

A

Relining

199
Q

Replacement of entire denture base while keeping the same denture teeth in their current occ relationship

A

Rebasing

d b review (38 decks)

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