Biomechanics
The following are questions likely to be included in the final exam from the lecture about Biomechanics.
posted by CLEyre @ 11/06/2006 03:35:00 PM
20 comments
Monday, November 06, 2006
About Me
- Name: CLEyre
- Location: Los Angeles, California, United States
I am currently the Director of the Predoctoral Program in Pediatric Dentistry.
20 Comments:
Which of the following is NOT true in regards to root structure and the surrounding alveolar bone during orthodontic movement?
A. Roots with anomalies such as dilacerations, pointed apices, and histories of previous trauma may be MORE succeptible to generalized root resorption.
B. All individuals are susceptible to generalized root resorption to some degree.
C. Roots typically become shorter but not thinner as a result of orthodontic tooth movement.
D. Clast cells attack bone but not cementum.***
E. Generalized root resorption increases with treatment duration.
ANSWER: D
Adam Shaffer (288)
Which of the following types of orthodontic wires has the greatest stiffness?
a) SS ***
b) NiTi
c) TMA
d) Elgiloy
Brian Asbury #205
Material properties are a function of
A. Strength
B. Stiffness
C. Range
D. All the above ****
Gregory Werner #298
Given a stress-strain curve, which part of the graph is utilized to generate orthodontic force?
a. Elastic range***
b. Plastic range
c. Loading range
d. Unloading range
Kinberly Antrim #201
Which of the following types of movement has the lowest optimum force level?
A)Root torque
B)Rotations
C)Tipping
D)Intrusion ***
Richard Manwaring #257
Stiffness is best described as:
a. ratio between force and deflection
b. yield strengh divided by elasticity
c. load divided by deflection
d. direction in which a force acts
answer: A
by: Jillian Boettcher
Applying 500 grams of force to a tooth will:
a. not be enough force to move the tooth
b. hurt the patient
c. possibly result in serious damage to the tooth
d. both b and c*
Grant Stucki 293
Which factor(s) is(are) required in order for teeth to translate?
A) Force only
B) Moment only
C) Both force and moment***
D) None of the above.
Jenessa Oo #269
The magnitude of a moment depends on:
a. the magnitude of the applied force
b. the perpendicular distance of the moment from the center of resistance
c. a and b *
d. none of the above
Elaine Fok #229
The center of resistance in a periodontally compromised tooth compared to a healthy tooth:
A)Is in bone
B)Is more coronal
C)Is more apical
D)A&B
E)A&C
Answer is E
Julio Moreno
#260
There is a linear relationship between stress and strain up until the stress surpasses the ____ of a wire.
a. proportional limit
b. offset
c. yield strength *
d. modulus of elasticity.
Eddie Surger (#294)
Which of the following is not a predictor of high potential for root resorption:
*a) conical roots with wide apices
b)dilacerated roots
c) history of trauma
d) evidence of previous root resorption
Megan Dietz #221
A force acting through the center of resistance results in pure ____________ of a tooth
a. tipping
b. translation**
c. coupling
d. rotation
Nuri Kim, #245
Orthodontic force comes from...
A) Geometry of teeth alignment
B) Frequency of wire change
C) Wire stiffness
D) Tension of elastic bands
E) A and C
**E
Anne Reeves 278
The strength of an orthodontic wire is:
A. Inversely related to its range
B. exponentially related to its range
C. Directly related to its range***
D. not related to its range
Ryan Kriwanek
#247
Which wire type is typically used as an initial wire in orthodontic treatment due to its resilience?
a. Stainless Steel
b. Copper
c. Nickel Titanium (NiTi)***
d. None of the above
Jennifer Egli
#224
A moment is equal to
a. A force divided by a distance
b. A force multiplied by a distance**
c. Pressure divided by distance
d Pressure multiplied by a distance
Jonathan Savage
#285
Strength is equal to
a. force multiplied by range
b. range multiplied by stiffness ***
c. deflection multiplied by elasticity
d. stiffness multiplied by force
e. elasticity multiplied by range
YatSing Yu
#297
Orthodontic treatment has:
A. high variation and high predictability.
B. high variation and low predictability.***
C. low variation and high predictability.
D. low variation and low predicability.
Jane Refela #279
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