Biology of Tooth and Skeletal Movement
The following are questions likely to be included in the final exam from the lecture about Biology of Tooth and Skeletal Movement.
posted by CLEyre @ 11/13/2006 04:46:00 PM
21 comments
Monday, November 13, 2006
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I am currently the Director of the Predoctoral Program in Pediatric Dentistry.
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21 Comments:
How long until cell death occurs in a compressed area under heavy pressure on a tooth during orthodontic movement?
A) Seconds
B) Minutes
C) Hours ****
D) Days
Brian Asbury #205
What do you expect to see after 3-5secs of sustained light pressure on a tooth?
a.) Blood vessels withing the PDL are compressed on the pressure side of the tooth and dilated on the tension side of the tooth, so there is mechanical distortion of the cells and PDL fibers.
b.) Metabolic changes occur and there is a change in enzyme levels.
c.) Tooth movement begins with remodeling of the bony socket by osteoclasts and osteoblasts.
d.) Blood vessels within the PDL are occluded on the pressure side.
Answer is A.
Natasha Judge #242
With light pressure being applied to the tooth, about how long until cellular differentiation begins to take place?
a) 1 second
b) 3-5 seconds
*c) 4 hours
d) 2 days
Megan Dietz #221
The application of light pressure to a tooth can result in frontal resorption. The application of heavy pressure to a tooth can result in undermining resorption.
*a. Both statements are true.
b. Both statements are false.
c. The first statement is true, and the second statement is false.
d. The first statement is false, and the second statement is true.
Kristi Shamburg #290
Which of the following types of movement is considered the simplest type of movement and occurs with a single force against the crown?
a)extrusion
b)root uprighting
c)translation
d)tipping **
e)rotation
The previous post was made by Lauren Fleischner #227. :)
(sorry about that!)
All of the following statements concerning orthodontic force are true except one. Which is the exception?
a. Optimum force for orthostatic purposes is the lightest force that produces a maximum or near-maximum reponse
b. the magnitude of the optimum force vary depending on the way it is distributed in the PDL
c. Optimum force will produce both pressure and tension on the PDL
*d. increasing orthodontic force will always increase tooth movement
Jonathan Do 2^3
Statement 1: Both force and moments are required to perform translation on a tooth.
Statement 2: Approxiamately twice amount of force is required to translate a tooth as compared to tipping a tooth.
A Statement 1 is true but statement 2 is false.
B Statement 1 is false but statement 2 is true.
C Both statements are true***
Pei Chun Hsu #239
Which of the following statements is true regarding “Undermining Resorption”?
A) It occurs when a heavy force is applied to the tooth within 4-6 hours.
B) After a heavy force is applied, osteoclasts within the PDL space differentiate and cause undermining resorption by attacking the underside of lamina dura.
C) It results from increased blood flow to the PDL space as a result of heavy force and inflammation at the site.
D) It occurs within several days after applying a heavy force, when osteoclasts within the adjacent marrow spaces attack the underside of lamina dura.
E) It is not related to the magnitude of force applied to the tooth.
Answer: D
Niloufar Nouri-Mahdavie
#268
The orthodontist should do the following to relieve pain when a patient has braces EXCEPT:
a)Tell the patient to bite on something hard to promote blood flow to the area of pain
b)Use light forces for tooth movement because this causes less compression and necrosis to the teeth
c)Tell the patient to use Tylenol as an analgesic
d)Tell the patient that NSAID should be used as an analgesic, and are beneficial because they promote tooth movement***
Carrie Loewen #255
How much time is required for bone socket remodeling by osteclasts/osteoblasts under sustained LIGHT pressure.
A. instantaneously
B. minutes
C. hours
D. days *
E. never, bone is resilient under light pressure
~Fouy Chau 212
The force duration recommended for maxillary headgear is:
a) at least 4 hrs a day
b) at least 8 hrs a day
c) at least 12 hrs a day ***
d) wear it at all times
Michelle Phillips #272
whats ideal for maxillary growth modification?
a)intermittant
*b)heavy intermittant
c)heavy continuos
d)all of the above
Sherry Shafighi
#289
Which of the following is false:
A. Root resorption is possible from long-term orthodontic treatment
B. Resorption occurs when there is osteoclastic activity on the cementum
C. Most mobility issues involving orthodontic treatment will self-correct
D. You can never orthodontically treat a non-vital tooth with endodontic history*
Shanna Kim, 246
The most ideal orthodontic force is
a.light and intermittent.
b.light and continuous.*
c. heavy and continuous.
d none of the above.
Le Tien Au #206
During intrusion, all of the force is concentrated at the apex of the tooth, yet this requires a lesser amount of force relative to other tooth movements because the force is applied to a smaller surface area.
a.) True*
b.) False
Submitted by Andrew Chen #214
What is the physiological response of the body to sustained HEAVY pressure after 7-14 days?
a) blood vessels within PDL occluded on pressure side
b)blood flow cut off to PDL area
c) cell death in compressed area
d) cell differentiation in adjacent narrow spaces
e) underming resorption removes lamina dura adjacent to compressed PDL ***
Andrew Hwang ID#240
Kristen Lowe #256
Which of the following answer choices best explains why teeth do not move in response to the imbalanced pressures that the cheeks, tongue and lips exert on teeth?
A. Odontoblast activity within in the pulp chamber
B. Cell death in compressed area
C. Cementoblast activity at the root apex
D. Metabolic activity within the periodontal ligament*
E. Osteoblast and osteoclast activity on the alveolar bone
Which of the following statements is TRUE regarding the relationship of tooth movement to force:
A. Tooth movement has a very high threshold
B. Tooth movement increases as pressure increases up to a point, and then remains at the same level over a short
range at the optimal force level.
C. Tooth movement increases as pressure increases up to a point, remains at the same level over a long range and
then it may decrease under heavy pressure *
D. Amount of tooth movement increases as pressure increases infinitely
Silva Megerdichian # 258
Forces appilied to the teeth when wearing removable orthodontic appliances (e.g. retainers or Invisalign) can be described as:
a.Intermittent
b.Continuous
c.Interrupted
d. Can be any of the above depending on the compliance of the patient***
Jennifer Egli #224
Which of the following is not a deleterious effect of orthodontic treatment?
A. mobility of the tooth due to a widened PDL space.
B. pain
C. "marked cementum" due to osteoclast activity on the cementum.
D. None of the above ***
Jane Refela #279
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