36. Restorative Dentistry Flashcards
1
Q
Tetralogy of denta caries
A
Diet - high sucrose diet
Host - tooth
Microorg
Time - frequency(more impt) and duration
2
Q
Triad of thumbsucking
A
Duration(most impt) - 6hrs
Frequency - am/pm
Intensity - 1 room away
3
Q
Microorg in enamel caries
A
Strep mutans
4
Q
Dentin caries
A
Lactobacillus acidophilus or casei
5
Q
Microorg in root or cemental caries
A
Actinomyces viscosus
6
Q
1st bacteria to colonize oral cavity (24hrs*) (or 10-12hrs)
Most numerous in oral cavity
A
Strep salivarius
7
Q
First to colonize plaque
24-48hrs after toothbrushing
A
Strep sanguis
8
Q
BQ: best technique for caries examination?
A
Visual examination
9
Q
BQ: What is the adhesive used by microorg to stick to the tooth?
A
Dextran
10
Q
BQ: What is the sugar that prevents glucose from binding to cariogenic microorganism?
A
Xylitol
11
Q
Is caries smaller or larger in radiograph?
A
Smaller
12
Q
Saliva prevents caries by
A
Remineralization
Acts as a buffer for acids
Use proteins, enzymes, antibodies that kill microorg
Wash food away
13
Q
Normal ph of saliva
A
6.2-7.0 (weak acid)
14
Q
Critical pH = dental caries
A
5.5
15
Q
If pH in saliva is lower that 5.5
A
Erosion
16
Q
Ig in saliva
A
IgA
17
Q
Stretchy property of saliva
A
Spinnbarkeit test
18
Q
BQ: Relationship of the 2 triangles in Pits and Fissure caries in the DEJ
A
Base to base relationship in the DEJ
19
Q
BQ: Relationship of 2 triangles in smooth surface caries in the DEJ
A
Apex to base / Base to apex
20
Q
BQ: BEST preventive measure for Pits and Fissure caries
A
PFS
21
Q
BQ: Best preventive measure for SMOOTH SURFACE CARIES
A
Fluoride
22
Q
BQ: Most sensitive part of the tooth during cavity prep
A
DEJ
23
Q
Theory about tooth sensitivity
A
Hydrodynamic theory
24
Q
BQ: most common site of proximal caries
A
Between contact area and gingiva
25
Shape or form of the conventional preparation that RESISTS DISPLACEMENT or removal of restoration
Retention form
26
Prevents FRACTURE of tooth and resto matl; withstand masticatory forces
Resistance form
27
Adequate observation, accessibility, ease of operation
Convenience form
28
Primary retention form of Class 1 prep
Converging Bu and Li occ = 90
| Or “diverging apically”
29
Wall outside the preparation
Cavosurface
30
Resistance form of Class 1 prep (2)
PARALLEL or (diverging) Mesial and Distal walls
+ Flat pulpal floor
31
Shape of enamel rods/enamel prism
Key hole
32
BQ: Depth in pit (class 1)
1.5mm - 2mm
33
BQ: Depth in DENTIN (Class 1)
0.2mm*
| Or to 0.5mm
34
Preparation/isthmus width (1/3) is for what form
Convenience form
35
BQ: After cavity prep, proper outline form is made and there are still carious lesions, what is the next thing to do?
Extend outline form
36
BQ: During occ cavity prep, which permanent teeth is mostly subjected to accidental pulp exposure?
Mn 1st premolar 🐍
37
BQ: APLA is bevelled or rounded?
APLA : Bevelled
38
Bu, Li, and Gingival walls in Class 2 proximal prep should be extended into the EMBRASURES (“spillways”) because:
For prevention of secondary caries
| Self cleansing
39
Minimum clearance during Class II prep
0.5mm
40
BQ: Depth of Retentive features
1/2 the size of a 1/4 round bur
| 0.25mm
41
Retentive features of Class 2 prep are placed in:
Axiofacial LA
| Axiolingual LA
42
Bu and Li walls
Gold:
Am:
Bu and Li walls
Gold: diverge occ (LAPJOINT)
Am: converge occ (BUTT JOINT)
43
MD walls
Gold:
Am:
MD walls
Gold: parallel occ
Am: parallel occ
44
Depth into dentin
Gold:
Am:
Depth into dentin
Gold: 0.2mm
Am: 0.2mm
45
Internal line angles
Gold:
Am:
Internal line angles
Gold: sharp (convenience)
Am: rounded (resistance)
46
Reverse bevel in Class II gold inlay is placed in the
Axiogingival LA
47
Occ and Prox CSM Bevel
Gold:
Am:
Occ CSM
Gold: 40 degree
Am: 90 degree
48
Gingival CSM of Gold
30 degree
49
Counterbevel of Onlay
30 degrees
50
Gingival CSM in Class II Am
Perm:
Deciduous:
Gingival CSM in Class II Am
Perm: 15-20 bevel
Deciduous: no bevel!
51
BQ: Best resto matl for Distolingual surface of Canines
Gold
52
BQ: Best approach in preparing class III caries?
Lingual approach
53
BQ: When preparing carious tooth adjacent to each other, which one is prepared first and which one is restored first?
Prepare: larger first (for convenience)
Restore: smaller first
54
BQ: Best rx to assess proximal caries
Bitewing
55
Retentive features of Class III prep are placed in
Gingivoaxial and incisoaxial LA
56
Class IV
Line angle:
Point angle:
Class IV
Line angle: 11
Point angle: 6
57
BQ: Axial wall of Class V prep
A. Convex
B. Concave
C. Flat
Convex
58
Walls that Follows contour of the surface of the tooth in CLASS V prep
Axial wall
59
Class VI:incisal edge of ant/cusp of post is named by
SIMON
60
BQ: Caries below the restoration
A. Recurrent caries
B. Secondary caries
RECURRENT caries
61
Caries that progressed just into the DEJ
Frank caries
62
Caries assoc with aging
Root surface caries / Senile caries
63
✨ Root surface caries is due to:
GINGIVAL RESORPTION
| DECREASE CORONAL CARIES
64
BQ: What is the radiolucency found just below the cej on the root due to ANATOMICAL VARIATION or GAP between enamel and bone covering the root
Cervical burnout
65
BQ: Tx for cervical burnout
No tx
66
BQ: Zone of carious enamel (except)
“Trained Dentists=Better Salary”
Translucent zone
Dark zone
Body zone
Surface zone
67
Zone of carious dentin: no bacteria present
Normal dentin
68
Zone of carious dentin: Subtransparent + Transparent dentin
Affected dentin
69
Dry leathery texture
| No need to remove bec it Can remineralize
Affected dentin
70
“Zone of bacterial invasion”
Turbid dentin
71
Outermost carious zone
Soft mushy texture
Removed during cavity prep
Infected dentin
72
Substantia adamantina
Enamel
73
Substantia ebornea
Dentin
74
Substantia ossea
Cementum
75
BQ: Which component is similar to bone?
A. Enamel
B. Dentin
C. Cementum
Cementum
76
BQ: Grasslike/ Fan shaped/ Bush of hypomineralized enamel extending from dej
Enamel tufts
77
Hypomineralized enamel but not radiating
Enamel lamellae
78
Odontoblastic processes extending into the enamel in the DEJ
Enamel spindle
79
BQ: Caries progress faster in enamel or dentin?
Dentin
80
BQ: Dead odontoblasts with Empty tubules are known as
Dead tracts
81
BQ: Bleaching affects enamel only, dentin only or both?
BOTH
82
“Time dependent” dimensional change
Creep
83
Components of Amalgam that both:
⬇️ Working time and creep
⬆️ Expansion
⬆️ Strength
Silver (Ag) and Copper (Cu)
84
Corrosion byproduct of Amalgam
Tin sulfite
85
Reaction of metal due to exposure in the environment
Corrosion
86
⬇️ Corrosion
Copper (Cu)
87
⬆️ working time and creep
⬆️ Expansion
⬇️strength
(Must be minimal!!)
Mercury (Hg)
88
BQ: Mercury-alloy ratio
1:1
| Pag wala sa choices: 8:5
89
⬆️⬆️⬆️ Expansion of amalgam when contaminated with moisture
Zinc
90
Adv of Zinc
Prevents oxidation
| Scavenger for oxides
91
BQ: Which amalgam alloy needs the most amount of mercury?
Irregular
92
BQ: Which amalgam alloy needs the least amount of mercury
Spherical
93
Strongest phase of am
Corrodes least
SILVER + TIN
Gamma phase
94
Phase: Silver + Mercury
Gamma One phase
95
Weakest phase; Corrodes most
| Tin + Mercury
Gamma Two phase
96
Low copper amalgam = % of copper?
<6% or <10% copper
97
Eliminates gamma two phase rxn
| >9-30% copper or 10%-30% copper
High copper amalgam
98
“Contraction” or “expansion” of a material
Dimensional change
99
BQ: Corrosion byproducts of amalgam has what advantage?
Tin sulfite = improves SEAL; Prevents secondary caries
100
BQ: Setting of amalgam : what process
Crystallization process
101
BQ: Setting time of amalgam
24hrs
102
BQ: Used to polish Am
Tin oxide
103
BQ: Used to polish Composite
Aluminum oxide
104
BQ: Used to polish GOLD
Iron oxide
105
Ideal resto for HIGH CARIES RATE
Amalgam
106
Ideal resto for PERIO
Gold
107
Ideal resto for ESTHETICS
Adults: co
Pedo: GI
108
Amalgam discoloration on GINGIVA
Amalgam tattoo
109
Amalgam discoloration on TOOTH
Amalgam blues
110
BQ: Which of the ffg is true about mulling?
CONTINUATION OF TRITURATION PROCESS
111
BQ: Which do you prefer, Overtriturated or Undertriturated amalgam?
Overtriturated
112
BQ: What is the procedure in which the amalgam is rubbed using the first finger and the thumb?
Mulling
113
BQ: Most common cause of amalgam chipping during carving
Carving after setting
114
BQ: When there is ditching of am resto, when is it indicated for replacement?
If ditch is >0.5mm
115
BQ: During amalgam carving, you can prevent ditching by;
Resting the sharp instrument on the cusp while carving
116
Distance from the margin of the mesial and distal wall to the prox surface must not be less than:
Pm =
Molars =
Premolars: 1.6mm
Molars: 2mm
117
BQ: Most difficult tooth to adapt a matrix band
Mx 1st PM (mesial developmental depression)
118
BQ: Why is the matrix band extended occ when restoring class II cavities?
For overfilling
119
BQ: Reasons for using WEDGE
Boards: to make the band taut (tight)
- prevent overhang
- for sep of tooth
120
Working end of Non cutting instrument
Nib
121
Four unit formula (W-A-L-A)
1. Blade width (/10)
2. Cutting edge Angle
3. Blade length
4. Blade angle
122
THREE UNIT FORMULA (W-L-A)
1. Blade width
2. Blade length
3. Blade angle
123
BQ: Omitted in 3 unit formula because it is immed 90 degrees or “perpendicular to the blade”
Cutting edge angle
124
Modification of enamel hatchet
GMT
125
Process of Setting of composites
Polymerization
126
Most common filler of composites
Colloidal silica
127
Fluid content of composites
Matrix
128
Most common matrix
BIS-GMA
| bisphenol-A glycidyl methacrylate
129
Bis-gma is introduced by
Bowen 1962
130
Binds filler to matrix
Coupling agent
131
Most common coupling agent
Silane
132
Darker shade/ ⬆️chroma (A 3.5) needs LESS or MORE curing time?
More curing time
133
BQ: Proper way to apply light cure
From afar then gradually go nearer
134
Are used to produce Radiopacity of Composite which serves as contrast for secondary caries
Barium, Zinc, boron, zirconium, yttrium
135
BQ: what inhibits polymerization
```
Cavity varnish (short term)
Eugenol
```
136
BQ: greatest disadv of polymerization
Shrinkage
137
Ratio of bonded surfaces to the unbound surfaces
Configuration factor
138
⬆️ highest configuration factor : ⬆️ Shrinkage
Class 1 and 5
139
Introduced etching or conditioning
Buonocore 1955
140
Most common etchant
37% phosphoric acid for 15s (enamel)
141
Most impt fnx of etchant
Reduces microleakage
142
BQ: After etching, tooth becomes contaminated with saliva, what to do?
Re etch
143
Retention of composites is by
Micromechanical retention
144
BQ: All of the ffg are fxns of etchants EXCEPT:
Improves esthetics
