Deck 60: Orthodontics

Question 1

A hook is used to:

A)attach a bracket to a tooth.
B)hold interarch elastics.
C)stabilize the ends of a facebow.
D)none of the above.

Answer 1

hold interarch elastics.

Question 2

During the frontal evaluation of facial esthetics,the face is examined:

A)to determine whether the jaws are proportionately positioned.
B)to evaluate lip protrusion.
C)for bilateral symmetry.
D)to evaluate the vertical facial proportions and the mandibular angle.

Answer 2

for bilateral symmetry.

Question 3

What is used to tie the arch wire into orthodontic brackets?

A)Separating wire
B)Wire ligatures
C)Elastic ligatures
D)Either b or c

Answer 3

Either b or c

Question 4

Severe malocclusion and dental facial deformities,both of which can cause social stigma and have a negative impact a patient's self esteem,are examples of:

A)a psychosocial function adversity.
B)an oral function adversity.
C)dental disease.
D)both a and c.

Question 5

An advantage of using the patient's model to select bands is that:

A)the patient doesn't need to be present.
B)it is more accurate.
C)neither are advantages.
D)both are advantages.

Question 6

The most common type of attachment for fixed appliances is the:

A)orthodontic band.
B)bonded bracket.
C)arch wire.
D)separator.

Question 7

Dental arch wires are held in place by:

A)ligature ties.
B)dental cement.
C)elastomeric ties.
D)both a and c.

Question 8

The arch wire is:

A)a pattern that gives the dental arch its shape.
B)used to hold interarch elastics.
C)bonded directly to the teeth.
D)used to stabilize the ends of a facebow.

Question 9

Orthodontic fixed appliances are also known as:

A)braces.
B)separators.
C)Hawley retainers.
D)clear "aligners."

Question 10

Which is NOT a function of the dental assistant in an orthodontic practice?

A)To motivate and reinforce oral home care
B)To make a diagnosis
C)To make appliance adjustments
D)To take and fabricate diagnostic records

Question 11

In orthodontics,a(n) _____ x-ray is taken to study and make measurements of the skull and analyze growth patterns.

A)panoramic
B)cephalometric
C)bitewing
D)occlusal

Question 12

The information needed for the diagnosis and treatment planning of an orthodontic case include:

A)medical and dental histories.
B)photographs and radiographs.
C)diagnostic models.
D)all of the above.

Question 13

Sticky foods should be avoided during orthodontic treatment because they:

A)weaken cement beneath bands causing bands to loosen and attack tooth enamel causing cavities.
B)loosen bands, pull out ligature ties, and bend arch wires.
C)may lodge between bands and beneath arch wires, causing irritation to gum tissues.
D)loosen bands, pull out the wires, and bend arch wires.

Question 14

The headgear tube:

A)is usually placed on the upper first molar bands.
B)stabilizes the ends of the facebow.
C)both a and b.
D)neither a or b.

Question 15

Which of the following choices represents a developmental cause of orthodontic problems?

A)interference with eruption
B)jaw size discrepancy
C)fetal molding
D)damage to permanent tooth buds when an injury to primary teeth has occurred

Question 16

The radiograph most commonly exposed for an orthodontic patient is the:

A)FMX.
B)panoramic.
C)cephalometric.
D)bite-wing.

Question 17

When taking photographs,the full direct view includes the:

A)extraoral frontal view, with the lips in a relaxed position.
B)intraoral view, with all teeth in occlusion.
C)extraoral profile view of the patient's right side, with the lips in a relaxed position.
D)intraoral right buccal view, with the distal of the canine to the distal of the last molar.

Question 18

Class II occlusion _____.

A)is normal occlusion
B)is mesioclusion
C)occurs when the mesiobuccal cusp of the maxillary first molar occludes in the interdental space between the mandibular second premolar and the mesial cusp of the mandibular first molar
D)occurs when the mesiobuccal cusp of the maxillary first molar occludes in the interdental space between the distal cusp of the mandibular first permanent molar and the mesial cusp of the mandibular second permanent molar

Question 19

The orthodontic problems of most people come from an interaction of which of the following?
1)Developmental
2)Genetic
3)Environmental
4)Functional influences

A)1, 2, 3, 4
B)1, 2, 3
C)1, 2
D)1

Question 20

An orthodontic positioner is designed to:

A)move the teeth.
B)retain the teeth in their desired position.
C)reposition the teeth during orthodontic treatment.
D)both a and c.

Question 21

After ligature ties are cut,the assistant should not:

A)tuck them toward the gingival.
B)tuck them toward the occlusal.
C)run a finger over then to check for comfort.
D)tuck them in the interproximal space.

Question 22

An open bite refers to a condition wherein:

A)there are no posterior teeth.
B)there are spaces between teeth in the same arch.
C)maxillary and mandibular teeth do not touch.
D)the teeth contact only during mastication.

Question 23

Which is not true of customized aligners?

A)They consist of a series of aligners designed by computer technology.
B)Each aligner is worn for about two weeks.
C)They can be used for all types of orthodontic treatment.
D)They are referred to as invisible braces.

Question 24

In preparation for the bonding of brackets the teeth are:

A)isolated using cotton rolls or retractors.
B)polished using a fluoride free paste.
C)etched, rinsed, and dried.
D)all of the above.

Question 25

What instrument is used to cut ligature ties when removing an arch wire?

A)Ligature cutters
B)Mosquito forceps
C)Explorer
D)Band removing pliers

Question 26

In class _____ occlusion,or distoclusion,the mandibular arch and the body of the mandible are in bilateral,distal relationship to the maxillary teeth.

A)I
B)II
C)III
D)none of the above

Question 27

The use of orthodontic separators may be necessary before placing:

A)arch wires.
B)bands.
C)bonded brackets.
D)ligatures.

Question 28

Arch wires that are made of _____ are useful in early stages of treatment because they are flexible.

A)nickel titanium
B)stainless steel
C)beta titanium
D)optiflex

Question 29

After preparing the tooth for bonding brackets,the sealant is placed on the ____ and the bonding material on the _____.

A)bracket; bracket
B)tooth; tooth
C)bracket; tooth
D)tooth; bracket

Question 30

The type of arch wire that is not used to position the crown and root of the teeth in final stages of treatment is:

A)round.
B)square.
C)rectangular.
D)all are used.

Question 31

Wire ligatures should be twisted and cut leaving a _____ mm pigtail.

A)1-2
B)2-3
C)3-4
D)4-5

Question 32

Elastic ligature ties should be removed using:

A)bird beak pliers.
B)a spoon excavator.
C)a hemostat.
D)an orthodontic scaler.

Question 33

In the placement of elastic ligatures,which of the following instruments may be used?

A)Locking hemostat
B)Pigtail explorer
C)Scaler
D)Ligature-tying pliers

Question 34

The arch wire that is used as a "working arch wire" is:

A)nickel titanium.
B)stainless steel.
C)beta titanium.
D)optiflex.

Question 35

Buccal arch wire tubes are located on _____ bands.

A)the maxillary first molar
B)the mandibular first molar
C)all
D)both a and b.

Question 36

_____ separators are placed between contacts with a "sawing" or flossing motion.

A)Brass wire
B)Elastic
C)Steel spring
D)Either b or c

Question 37

During cementation of bands,the cement is placed on the:

A)brackets.
B)tooth.
C)outer surface of the band.
D)inner surface of the band.

Question 38

On which teeth are brackets most commonly bonded?

A)Anterior teeth
B)Premolars
C)Molars
D)Both a and b

Question 39

_______ are(is) used to close space between teeth.

A)Elastic ligatures
B)Elastic chains
C)Comfort tubing
D)Both a and b

Question 40

In ______,the mesiobuccal cusp of the maxillary permanent first molar occludes in the interdental space between the distal cusp of the mandibular first second premolar.

A)distoclusion
B)labioversion
C)linguoversion
D)mesioclusion

Question 41

The attachment either welded to bands or attached to a backing pad that is bonded directly to the teeth is a:

A)bracket.
B)separator.
C)retainer.
D)coil spring.

Question 42

Elastic separators can be left in the mouth for ____ days,and steel can be left in the mouth for _____ days.

A)7; 7
B)14; 5
C)5; 14
D)14; 14

Question 43

The function of the _____ is to apply force to either move the teeth or hold them in the desired positions.

A)buccal tubes
B)bracket
C)arch wire
D)none of the above

Question 44

Why is glass ionomer cement the most commonly used cement for banding orthodontic bands?

A)It contains fluoride that aids in preventing decay under the bands.
B)It has adequate strength to aid in retention with enamel.
C)It is capable of being bonded to the tooth surface.
D)Both a and b are correct.

Question 45

To floss under the arch wire,the patient should be instructed to use:

A)an interproximal brush.
B)floss threader.
C)a Waterpik.
D)all of the above.

Question 46

Overjet is the:

A)horizontal distance between maxillary and mandibular teeth.
B)coronal length of maxillary anterior teeth.
C)vertical overlap of maxillary and mandibular anterior teeth.
D)labioversion of the mandibular teeth.

Question 47

What is used to place elastic separators?

A)Hemostat
B)Dental floss
C)Elastic separating pliers
D)Either b or c

Question 48

Beyond the age of ____,thumb and finger sucking will affect the upper facial structure and upper anterior teeth.

A)two
B)three
C)five
D)seven

Question 49

An orthodontic tooth positioner is not used:

A)to retain teeth in position.
B)to separate the teeth before banding.
C)to massage tissue.
D)prior to a retainer.

Question 50

The condition in which the mandible is located ahead of the maxilla is frequently called:

A)overbite.
B)underbite.
C)retrusion.
D)centric relation.

Question 51

A headgear appliance is:

A)an orthopedic device.
B)composed of two parts.
C)used to move the maxillary first molar distally.
D)all of the above.

Question 52

Preparing bands for cementation includes all of the following except:

A)wiping attachments with wax or Chapstick.
B)placing the band occlusal surface down on masking tape.
C)placing the band gingival surface down on masking tape.
D)fill the entire inner surface with cement.

Question 53

_____ are attached to hooks or buttons that are secured on the band or brackets.

A)Springs
B)Tooth positioners
C)Elastic separators
D)Elastics

Question 54

Foods that should be avoided by patients with fixed appliances include:

A)chewing gum.
B)sticky foods.
C)popcorn.
D)all of the above.

Question 55

Removal of bands may be accomplished with a(n):

A)band seater.
B)explorer.
C)bird-beak pliers.
D)band-removing pliers.

Question 56

The habit that may be a result of narrowing of the maxilla is:

A)bruxism.
B)tongue thrusting.
C)mouth breathing.
D)all of the above.