DECKS Flashcards
All of the following are advantages of the indirect method of bonding brackets to a tooth over the direct method EXCEPT one. Which one is the EXCEPTION?
a. Reduced chair-side time
b. More precise location of brackets possible in the laboratory
c. Bontrolled thickness of the resin between the tooth and the bracket interface
d. Less technique sensitive
e. Easier clean-up during bonding and de-bonding
f. Better visualization in lab (especially for lingual brackets)
d. Less technique sensitive❌
NOTES:
The indirect bonding technique is more complex and technique sensitive and requires extra precautions.
The following are considered functional appliances EXCEPT
a. Frankel
b. Bionator
c. Clark’s twin block
d. Herbst
e. Activator
f. Quad-helix
f. Quad-helix
NOTES:
The quad-helix is a fixed appliance that consists of 4 helices (2 anterior and 2 posterior). Essentially, this appliance is used for posterior cross-bite cases with a digital-sucking habit.
Functional Appliance- are used to treat Class II malocclusions.
A headgear appliance is used for:
a. Anchorage
b. Traction
c. Both anchorage and traction
d. Neither anchorage or traction
c. Both anchorage and traction
NOTES:
ANCHORAGE- maintain space
TRACTION- create space
The following are fixed orthodontic appliances EXCEPT
a. Lingual archwires
b. Whip-spring appliances
c. Palate-separating devices
d. Frankel’s appliances
e. Edgewise mechanisms
f. Light-wire appliances
d. Frankel’s appliances
NOTES:
Frankel’s appliance- is a removable functional appliance and is employed in cases of abnormal
(hyperactive) soft tissue patterns.
When comparing stainless steel versus nickel titanium in orthodontic wires, stainless steel has a ____ modulus of elasticity, and ____ resilience.
a. higher, higher
b. higher, lower
c. lower, higher
d. lower, lower
b. higher, lower
NOTES:
Higher modulus of elasticity (stiffer), lower resilience (lower clastic limit) Ni-Ti has better resilience.
Which appliance is probably the most widely used today by orthodontists?
a. The begg appliance
b. The edgewise appliance
c. The universal appliance
d. None of the above
b. The edgewise appliance
The Hawley retainer is the most common retainer in orthodontics because it can use the palate for anchorage.
a. Both the statement and the reason are correct and related
b. Both the statement and the reason are correct but not related
c. The statement is correct, but the reason is not
d. The statement is not correct, but the reason is correct
e. Neither the statement nor the reason is correct
b. Both the statement and the reason are correct but not related
NOTES:
Multiple appliances can use the palate for anchorage. The true reason that the Hawley retainer is the most common is because of the variety of benefits it has and can have when used properly.
The maxillary fixed bilateral space maintainer. This type of space maintainer also is known as a:
a. Distal shoe
b. Nance appliance
c. Lingual holding arch
d. Hawley retainer
e. Band and loop (bilateral)
b. Nance appliance
An active finger spring of a removable appliance usually touches the tooth with a point contact. What is the most likely type of tooth movement produced in this situation?
a. Tipping
b. Extrusion
c. Intrusion
d. Translation
a. Tipping
NOTES:
Finger springs-best method for tipping maxillary and mandibular anterior teeth. These are attached to a removable appliance.
Prior to direct bonding, ___ is used as an etching agent. Prior to placing bands, ___ is used as an etching agent.
a. nothing; 35-50% unbuffered phosphoric acid
b. 35-50% unbuffered phosphoric acid; nothing
c.nothing; 10-15% unbuffered phosphoric acid
d. 10-15% unbuffered phosphoric acid; nothing
b. 35-50% unbuffered phosphoric acid; nothing
NOTES:
When placing bands, either glass ionomer or zinc phosphate cements are used and do not require etching.
An example of a maxillary permanent central incisor in crossbite is shown. In order to treat this condition properly, the dentist should do what?
a. Do nothing until all permanent teeth have erupted
b. Surgically reposition the central incisor
c. Correct the condition immediately with a simple appliance
d. place a maxillary expander
c. Correct the condition immediately with a simple appliance
NOTES:
Ideally, this anterior crossbite should be corrected before it reached the occlusal plane (while it was erupting). The most probable etiologic factor for this happening is prolonged retention of the primary maxillary incisors.
Orthodontic forces can be treated mathematically as vectors.
Forces produce either translation (bodily movement), rotation, or a combination of translation and rotation , depending upon the relationship of the line of action of the force to the center of resistance of the tooth.
a. Both statements are true
b. Both statements are false
c. The first statement is true, the second is false
d. The first statement is false, the second is true
a. Both statements are true
Which of the following may cause extrusion of the maxillary first molars which can cause an open bite?
a. Straight-pull headgear
b. Reverse-pull headgear
c. Cervical-pull headgear
d. High-pull headgear
c. Cervical-pull headgear
NOTES:
High-pull headgear: Distally + Extrude
Straight-pull headgear: Distally
Cervical-pull headgear: Distally + Intrude
Which condition is appropriately treated at an early age?
a. Deviated midline in the absence of a functional shift
b. Mild crowding of lower permanent incisors
c. Two deciduous molars nearly in crossbite
d. Posterior crossbite with a functional shift
d. Posterior crossbite with a functional shift
Displaced teeth related to functional shifts occur in which of the following situations? Select 2.
a. Posterior crossbite after prolonged thumb sucking
b. Class II, division I malocclusion
c. Anterior crossbite in mildly prognathic children
d. An anterior open bite after prolonged thumb sucking
a. Posterior crossbite after prolonged thumb sucking
c. Anterior crossbite in mildly prognathic children
Maxillary expansion is often done to correct crossbites. Tongue thrusting often causes an anterior open bite.
a. Both statements are true
b. Both statements are false
c. The first statement is true, the statement is false
d. The first statement is false, the second is true
a. Both statements are true
Which of the following are not classic symptoms of a sucking habit?
a. Anterior open bite
b. Crossbite
c. Expanded maxillary arch
d. Proclination of the maxillary incisors
e. Retroclination of the mandibular incisors
f. A Class III malocclusion
c. Expanded maxillary arch❌
CONSRICTION of the maxillary arch occurs, not expansion.
An anterior crossbite should be corrected as soon as it is detected, because it is difficult to retain the corrected occlusion.
a. Both the statement and the reason are correct and related
b. Both the statement and the reason are correct but not related
c. The statement is correct, but the reason is not
d. The statement is not correct, but the reason is correct
e. Neither the statement nor the reason is correct
c. The statement is correct, but the reason is not
A patient’s SNA angle is 78°. The SNB angle is 76º. This tells us that the maxilla is ____, the mandible is, ____ and the skeletal profile is ____.
a. prognathic; retrognathic; class I
b. retrognathic; prognathic; class III
c. prognathic; prognathic; class I
d. retrognathic; retrognathic; class I
e. prognathic; prognathic; class I
f. retrognathic; retrognathic; class II
d. retrognathic; retrognathic; class I
NOTES:
SNA ANGLE- angle created in the intersection from from the sella turcica (S) to nasion (N) and one from nasion to Point A. (82°)
MAXILLARY PROGNATHISM: > 82° SNA
MAXILLARY RETROGNATHISM: < 82° SNA
SNB ANGLE - created by the intersection of line SN and NB defines the sagittal location of the mandibular denture base. (80°)
MANDIBULAR PROGNATHISM: > 80° SNB
MANDIBULAR RETROGNATHISM: < 80° SNB
SNA- SNB= ANB
ANB= 2°
SKELETAL PROFILE CLASS 1: 2° ANB
SKELETAL PROFILE CLASS 2: > 4° ANB
SKELETAL PROFILE CLASS 3: <0° ANB
A “Poor man’s Cephalometric Analysis” is performed via a:
a. Dental cast analysis
b. Facial profile analysis
c. Photographic analysis
d. Full face analysis
b. Facial profile analysis
All of the following correlate with a steep mandibular plane EXCEPT one. Which one is the EXCEPTION?
a. Long anterior facial vertical dimension
b. Anterior open bite
c. Tendency toward a Class III malocclusion
d. Greater maxillary-mandibular plane angle
c. Tendency toward a Class III malocclusion❌
Tendency toward a Class II malocclusion
What is needed so that soft tissues are clearly visible on a lateral cephalometric radiograph?
a. Adjustment in kilovoltage
b. Adjustment in milliamperage
c. A soft tissue shield
d. A hard tissue shield
e. Nothing must be done to make soft tissues visible
c. A soft tissue shield
The Frankfort-Horizontal plane is constructed by drawing a line connecting porion (4) and orbitale (8).
This has been adopted as the best representation of the natural orientation of the skull.
a. Both the statement and the reason are correct and related
b. Both the statement and the reason are correct but not related
c. The statement is correct, but the reason is not
d. The statement is not correct, but the reason is correct
e. Neither the statement nor the reason is correct
a. Both the statement and the reason are correct and related
In predicting the time of the pubertal growth spurt, while treating jaw malrelationships in a growing child, the orthodontist can get the most valuable information from:
a. Wrist-hand radiograph
b. Height-weight tables
c. Presence of secondary sex characteristics
d. Stage of dental development
a. Wrist-hand radiograph
NOTES:
The physiologic age or developmental age can be judged by finding out the skeletal development.
ADOLESCENT GROWTH SPURT:
Landmarks: ulnar sesamoid or hamate bones