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What shape are the premolars from their lingual or buccal surfaces?
How many developmental lobes do premolars have?
Which premolar often has two lingual cusps?
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.
On Premolars, the buccal cusp tips are _____________ to the axis except for ________________ whose cusp tips are more _____________.
- 1. Mesial
- 2. Max 1st
- 3. Distal
On premolars, the ___________ cusp ridge is ______________ than the ______________ except on ______________.
- 1. Mesial
- 2. shorter
- 3. distal
- 4 Max 1st.
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.
On premolars, the _____________ cervical line is more _____________.
On maxillary premolars, which side of the crown is wider?
Which is the only tooth with a longer mesial cusp ridge than distal?
Max 1st Premolar
Which premolar root has a bifurcation?
Max 1st Premolar
Which tooth usually has two canals regardless of two roots or not?
Max 1st Premolar
Mand 2nd Premolar sometimes has two cusps, which one is bigger?
Mesiolingual is greater than distolingual.
Which tooth is the only tooth with a mesiolingual groove?
Mand 1st Premolar
Which tooth has a lingual groove and may be shaped like a Y?
Mand 2nd Premolar (HUY)
Which tooth does not have a root concavity on its mesial root?
Mand 2nd Premolar.
In molars, the buccal crest of curvature is ________________ and lingual crest of curvature is ________________.
- 1. Cervical 1/3
- 2. Middle 1/3
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
On max molars, what direction does the oblique ridge run?
Mesiolingual to distobuccal. Direction of the arch ^
On max molars, what aspect picks up calculus and is harder to restore?
The disto-facial cervical line.
Which is the only tooth with a lingual concavity on the root?
Max 1st molar
1. What is a homophyodont?
2. What is a heterophyodont?
- 1. One type of tooth
- 2. Different types of teeth.
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
Explain transverse vs oblique ridges.
Tranverse ridge are two triangular ridges that connect from buccal to lingual. Oblique run distobuccal to mesiolingual
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
1. On mand 1st molar, which cusp is the longest?
2. Which cusp is the widest?
3. Which root is wider?
Which tooth is most likely to be impacted?
Mand 3rd molar.
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
What're the numbers for straight fissure plain?
What're the numbers for straight fissure crosscuts?
What're the numbers for tapered fissure plain?
169, 170, 171
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!
What're the numbers for an inverted cone?
33 1/2, 35, 37
What're the numbers for elliptical burs?
329, 330, 331, 245, 246, 1170
Carbide finishing burs can have __ to __ blades. Increasing the number of blades increases __________ but decreases ________.
- 1. 12
- 2. 30
- 3. smoothness
- 4. efficiency
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.
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]
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.
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.
Which root is the straighest in the maxillary molars?
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.
What is convenience form?
Shape of cavity that allows vision, access and ease of instrumentation and insertion of restorative material.