Operative Flashcards
Critical pH of developing cavity?
5.5
Which is least likely to predict future caries?
Amount of sugar intake
Frequency of sugar intake
Amount of caries and restorations
Amount of sugar intake
Which of the following is the earliest clinical sign of a carious lesion?
A. Radiolucency B. Patient sensitivity C. Change in enamel opacity D. Rough surface texture E.Cavitation of enamel
C. Change in enamel opacity
What is true of Strep. mutans?
- Can live in plaque,
- Can live on gingival
- Can live in a child with no teeth
- Has to live on a non-shedding surface
• Has to live on a non-shedding surface
What bacteria helps in carious process but it is not the primary inititator for caries:
Lactobacillus
fact: Lactobacillus: does not initiate caries but is part of the progression of caries
fact Lactobacillus: does not initiate caries but is part of the progression of caries
Which race has most caries in kid population?
hispanic
which tooth are involved in early childhood caries
centrals and molars
Which population has the most number of UNRESTORED caries
black
Recent survey, what kind of stats on caries?
• inc in smooth surf caries - wrong
• inc in pit/fissure caries - wrong
• smooth surf caries and pit/fissure caries is same - wrong
• inc in root caries
increase in root caries
For a lesion in enamel that has remineralized, what most likely is true?
- The enamel has
smaller hydroxyapatite crystals than the surrounding enamel, - The remineralized enamel is softer than
the surrounding enamel, - The remineralized enamel is darker than the surrounding enamel,
- The remineralized enamel is rough and cavitated
- The remineralized enamel is darker than the surrounding enamel,
Characteristic of a lesion that is remineralized:
black, dark, bright
black, dark, opaque
black, dark, cavitated
black, dark, opaque
In which of these cases do you start restoration:
can see on x-ray, cavitation present,
lesion ½ into enamel, cross CEJ
cavitation present
Tx of root surface caries: what kind of dentin should not be restored?
Eburnated dentin(Sclerotic dentin)
Where does fluoride work the best?
A. interproximal
B. Pit and fissure
interprox
Pit and Fissure caries is described as two cones
interprox: «
occlusal: AV
conical shaped caries w/ broad base with apex towards pulp is commonly seen in?
a. root caries
b. smooth caries
c. pit/fissure caries
smooth caries
How does caries indicator dye work
binds to denatured collagen
What type of caries detection is the Dyfoti used for?
Class I, II, III
What type of caries detection is the DaignoDent used for?
Class I
Radiographic decay most closely resemble which zone of carious enamel?
Body zone
Dark zone
translucent zone
surface zone
body zone
which one accounts for 3rd molars? DMFS / DMFT
DMFS
DMFT- who has the most F- white, blacks, Hispanic, Indians
white
which of the following acronyms is only used for kids? PI, def, DMF, OHI-S, another weird
acronym
def
Differences between 245 and 330 burs
length of 330: 1.5mm
length of 245: 3mm
Diameter of 245 bur
0.8mm
What is the correct method of excavation of deep caries?
Long bur from periphery to the center,
large bur from center to periphery,
small bur from periphery to center,
small bur from center to the periphery
Long bur from periphery to the center
Rotary hand instruments: high speed how many round per min?
____RPM
20k
main difference and advantage of using GMT instead of Enamel hatchet?
a. bi-angled cutting surface
b. angle of the blade
c. push/pull action instead of
b. angle of the blade
what can’t you use to bevel inlay prep?
a. enamel hatchel
b. ging marg trimmer
c. flame diamond
d. carbide
a. enamel hatchel
What do u not use when beveling gingival margins
tapered diamond
How do you bevel occlusal floor?
- 13,8
- 15,80
- 15,95
• 15,80
fact: What instrument would not be used to bevel the gingival margin of an MOD prep? Enamel Hatchet
fact: What instrument would not be used to bevel the gingival margin of an MOD prep? Enamel Hatchet
Most common pulpal damage from cavity prep?
heat? etch? desiccation?
heat
What would cause displacement of odontoblastic processes?
Thermal,
desiccation
mechanical
chemical
Thermal
Subacute mercury poisoning symptoms
hair loss and Hypotonia (muscle weakness)
Most likely for amalgam to fail? Outline cavity design or poor condensation
outline cavity design
Most common location of fracture of Class II amalgam
isthmus
Most common reason for failed amalgam
depth of isthmus
how far extend pulpal floor in class I amlgam cavity on primary dentition. \_\_\_mm into dentin
1mm
More corrosion in which phase of amalgam?
Tin-mercury phase (gamma-2)
Zinc in Amalgam, what is used for?
Decreases oxidation of other elements, deoxidizer
What type of Mercury is in the dental office? elemental or inorganic?
elemental
Type of mercury most hazardous to dentist health?
methylmercury,
ethylmercury,
inorganic mercury,
elemental mercury
methylmercury
What type of amalgam needs to be condensed more?
admix
Material to use for best interprox contact of a CLASS II is
admix
Over triturating amalgam: inc/dec setting expansion time?
decrease
Placing pin in amalgam restoration: ___mm into amalgam
2mm
What happens to amalgam if it is contaminated with water?
what happens to expansion and strength?
delayed expansion
decrease strength
Where is it acceptable to leave unsupported enamel?
Class V amalgam
What do class I & class V Ag ideal prep have in common
a. both slightly extend into dentin
b. both have flat axial & pulpal wall
a. both slightly extend into dentin
T/F: Is the isthmus the same for inlay and amalgam
T
How to account for mesial concavity on maxillary 1st premolar when restoring with
amalgam:
custom wedge
From pt images, Which amalgam filling has the lowest Copper content?
One that looks
corroded
pt presents with amalgams restorations in good shape, the dentist suggest to change
them for composites due to systemic toxicity of the amalgam what ethic principle is there or the
dentist is violating what principle:,
veracity
onlay resistance/retention: ____ degrees of taper per wall
2 to 5
most rigid type of gold: I/2/3/4
type 4
When do use base metal apposed to gold
long span bridges
Weakest part of the gold mod inlay is its
cement
fact: Gold crown being cemented, which is wrong? Zinc phosphate is not an option
fact: Gold crown being cemented, which is wrong? Zinc phosphate is not an option
fact: Which is not correct? resin ionomer used to cement crown
fact: Which is not correct? resin ionomer used to cement crown
gold on upper tooth, lower amalgam, patient has severe pain?
Galvanic shock
Isthmus of MOD prep extend over 1/3 of cusp to cusp, how to treat?
amalgam, onlay, inlay crown
>1/3 intercuspal dimension
onlay (b/c >1/3 intercuspal dimension)
What is the reason the burnish gold to the margin
acute angle of gold margin
percent elongation for burnishing
remove unsupported enamel
which is the only surface not beveled for an onlay?
pulpal
Purpose of addition of tin and iron to metal ceramic allows:
Chemical bond
Covalent bond
chemical bond
What causes most post op sensitivity in direct inlay:
Polymerization shrinkage
fact: Cement for porcelain onlay HAS TO BE RESIN
fact: Cement for porcelain onlay HAS TO BE RESIN
Coefficient of thermal expansion in order
tooth < gold < amalgam < filled resin < unfilled resin
