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What shape are the premolars from their lingual or buccal surfaces?
Pentagon
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How many developmental lobes do premolars have?
4.
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Which premolar often has two lingual cusps?
Mand 2nd
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On premolars AND molars, the mesial proximal contacts are at the junction of the __________ and ___________ __________ where as the distal are more __________ in the ________ _________. The only exception is the ______________, its mesial contact is more ____________.
- 1. Occlusal
- 2. Middle third
- 3. Cervically
- 4. Middle third
- 5. Mand 1st premolar.
- 6. Cervical.
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On Premolars, the buccal cusp tips are _____________ to the axis except for ________________ whose cusp tips are more _____________.
- 1. Mesial
- 2. Max 1st
- 3. Distal
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On premolars, the ___________ cusp ridge is ______________ than the ______________ except on ______________.
- 1. Mesial
- 2. shorter
- 3. distal
- 4 Max 1st.
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On premolars, the ____________ marginal ridge is more ___________ except on the ______________ where the ____________ marginal ridge is more ______________.
- 1. mesial
- 2. occlusal
- 3. mand 1st
- 4. distal
- 5. occlusal.
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On premolars, the _____________ cervical line is more _____________.
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On maxillary premolars, which side of the crown is wider?
Buccolingual
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Which is the only tooth with a longer mesial cusp ridge than distal?
Max 1st Premolar
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Which premolar root has a bifurcation?
Max 1st Premolar
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Which tooth usually has two canals regardless of two roots or not?
Max 1st Premolar
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Mand 2nd Premolar sometimes has two cusps, which one is bigger?
Mesiolingual is greater than distolingual.
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Which tooth is the only tooth with a mesiolingual groove?
Mand 1st Premolar
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Which tooth has a lingual groove and may be shaped like a Y?
Mand 2nd Premolar (HUY)
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Which tooth does not have a root concavity on its mesial root?
Mand 2nd Premolar.
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In molars, the buccal crest of curvature is ________________ and lingual crest of curvature is ________________.
- 1. Cervical 1/3
- 2. Middle 1/3
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1. Which tooth is the widest tooth in the mouth faciolingually?
2. Which tooth is the widest tooth in the mouth mesiodistally?
- 1. Max 1st molar
- 2. Mand 1st molar
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On max molars, what direction does the oblique ridge run?
Mesiolingual to distobuccal. Direction of the arch ^
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On max molars, what aspect picks up calculus and is harder to restore?
The disto-facial cervical line.
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Which is the only tooth with a lingual concavity on the root?
Max 1st molar
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1. What is a homophyodont?
2. What is a heterophyodont?
- 1. One type of tooth
- 2. Different types of teeth.
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1. What is a homophydont?
2. What is a diphyodont?
3. What is a triphyodont?
- 1. One set of teeth
- 2. Two sets of teeth (us)
- 3. Three sets of teeth
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Explain transverse vs oblique ridges.
Tranverse ridge are two triangular ridges that connect from buccal to lingual. Oblique run distobuccal to mesiolingual
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1. Max 1st and 2nd molar occlusal aspect is what shape?
2. Max and mand 1st molar buccal aspect is what shape?
- 1. Rhomboidal
- 2. Trapezoidal
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1. On mand 1st molar, which cusp is the longest?
2. Which cusp is the widest?
3. Which root is wider?
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Which tooth is most likely to be impacted?
Mand 3rd molar.
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1. Which type of bur is sharp but dulls easily when cutting enamel?
2. Which type of bur is harder and its blade stays sharper longer?
- 1. Steel
- 2. Tungsten carbide
-
What're the numbers for round burs?
1/4 - 8
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What're the numbers for straight fissure plain?
56, 57
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What're the numbers for straight fissure crosscuts?
556. 557
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What're the numbers for tapered fissure plain?
169, 170, 171
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What're the numbers for tapered fissure crosscut?
699 (not just adding a 6 in front of the 169), 700
One-[plain]-sixty-nine and a tapered sixty-nine-nine. Scandalous!
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What're the numbers for an inverted cone?
33 1/2, 35, 37
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What're the numbers for elliptical burs?
329, 330, 331, 245, 246, 1170
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Carbide finishing burs can have __ to __ blades. Increasing the number of blades increases __________ but decreases ________.
- 1. 12
- 2. 30
- 3. smoothness
- 4. efficiency
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1. In a class 1 cavity prep, the mesial-distal walls (converge/diverge?) pulpo-occlusally?
2. How about buccolingually, do they cove1rge or diverge?
-
Where are retention grooves placed in large preps?
Gingivally and occlusally.
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Black's hand instrument formula:
1. 3 numbers mean what?
2. 4 numbers mean what?
- 1. Width, length, angle.
- 2. Width, angle (cutting edge), length, angle (blade). [WALA...as in "viola! 4 Numbers]
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What's the composition of Gamma phase?
Silver and Tin. (Ag3Sn)
-
What's the composition of Gamma 1?
Silver and Mercury. (Ag2Hg3)
-
What's the composition of Gamma 2?
Silver and Tin (Sn8Hg)
Because the Tin man is retarded, we don't want him! We don't want Gamma 2.
-
What's the composition of Epsilon phase?
Copper and tin. Cu3Sn
-
What's the composition of Eutectic phase?
Silver and copper. Ag3Cu2
-
What's the composition of eta phase
Copper and tin. (Cu6Sn5)
-
How do you get rid of Gamma 2 in high copper admix alloy?
Start with Gamma + eutectic + mercury to yield Gamma + gamma 1 + gamma 2 + eutectic.
To get rid of gamma 2, use solid state reaction which is gamma 2 + eutectic yields gamma 1 + eta.
-
What is galvanism?
Small electrical current created from the contact of two dissimilar metals.
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1. Which phase is the strongest?
2. Which phase is most creep resistance?
3. Which phase is most corrosion resistance?
- 1. Gamma
- 2. Eutectic (Eu-Tectic Creep....You tectic creep!!)
- 3. Gamma 1
-
1. What kind of particles does lathe-cut have? Does it require more or less mercury to wet?
2. What kind of particles does sphereical have? Does it require more or less mercury to wet?
- 1. Cracked. More.
- 2. Smooth. Less
-
1. What does under-mixed amalgam look like and what're the disadvantages?
2. What does over-rmixed amalgam look like and what're the disadvantages?
- 1. Dry and crumbly. It increases creep and decreases tensile and compressive strength
- 2. Warm with a dull surface. It increases setting time and decreases creep and contraction .
-
What would be the effect of prolonged condensation on amalgam?
It will crack the forming matrix.
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Which root is the straighest in the maxillary molars?
Distobuccal
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Are facial embrasures bigger than lingual embrasures?
What's the exception?
No. Facial embrasures are smaller than lingual embrasures. The Maxillary 1st molar is the exception.
-
What is resistance form? Example?
Shape given to prep to prevent the fracture of tooth or restoration. Example: rounding of corners.
-
What is retention form? Example?
Shape of the cavity to prevent restorative material from falling out i.e. grooves, undercuts, truncation, pins, dovetails etc.
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What is convenience form?
Shape of cavity that allows vision, access and ease of instrumentation and insertion of restorative material.
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