FAGD Exam - Orthodontics Questions and Answers Already Passed
Maxillary fixed bilateral space maintainer is also known as? - Answers Nance appliance
If both primary canines were present, what appliance could be used in place of a Nance
appliance (maxillary fixed bilateral space maintainer)? - Answers Band and loop (bilateral)
What situation is a Nance appliance appropriate for? - Answers Premature bilateral loss of
maxillary primary teeth
What are the 4 properties of ideal wire material? - Answers 1. High strength
2. Low stiffness
3. High working range
4. High formability
Stainless steel wire characteristics - Answers - good mechanical properties
- excellent corrosion resistance
- low cost
- highest modulus of elasticity
- lowest spring back
- 18% chromium, 8% nickel
Stainless steel vs nickel titanium orthodontic wires - Answers Stainless steel has a high
modulus of elasticity and a lower resilience
NiTi orthodontic wire characteristics - Answers Offer a highly desirable combination of low
modulus of elasticity and extremely wide working range
Benefits of the Hawley retainer? - Answers - palatal coverage makes it possible to incorporate a
bite plant lingual to the upper incisors to control bite depth
-
What is the major source of anchorage in a Hawley appliance? - Answers Palatal coverage
Prior to direct bonding, ________ is used as an etching agent. Prior to placing bands, ________ is
used as an etching agent? - Answers 35-50% unbuffered phosphoric acid
Nothing
Indications for using bands instead of banded brackets? (4) - Answers 1. To provide better
, anchorage for greater tooth movement
2. For teeth that will need both lingual and labial attachment
3. Teeth with short clinical crowns
4 Tooth surfaces that are incompatible with successful bonding
What is the "anchorage value" of any tooth? - Answers It is roughly equivalent to its root surface
area (the same as the periodontal ligament area)
What are the 5 anchorage types? - Answers 1. Reciprocal tooth movement: is produced when
two teeth or resistance units of equal size are moved against each other and move the same
amount toward or away from each other.
2. Reinforced anchorage: is accomplished by adding additional teeth to the unit to distribute the
force over a larger root surface area in the anchorage unit. Note: Another method for reinforcing
anchorage would be to add an extraoral force such as headgear or interarch elastics.
3. Stationary anchorage: displacement of anchor teeth can be minimized by arranging the force
system so that anchor teeth must move bodily (translation) if at all, while movement teeth are
allowed to tip. This approach is called "stationary anchorage."
4. Cortical anchorage: anchor teeth roots are moved into cortical bone which resorbs more
slowly than does medullary bone. This situation may be encountered at an old extraction site, it
can be almost impossible to close such an extraction site, because tooth movement is slowed
to a minimum as the roots encounter cortical bone along the resorbed alveolar ridge.
5. Implants for anchorage: implants can serve as anchorage for holding or moving teeth. The
implant (if stable) will not move because it has no PDL
Cervical-pull headgear - Answers consists of a cervical neck strap (as anchorage) and a
standard facebow inserting into the headgear tubes of the maxillary first molar attachments.
The objectives of treatment with these types of headgear are to restrict anterior growth of the
maxilla and to distalize and erupt maxillary molars.
Maxillary fixed bilateral space maintainer is also known as? - Answers Nance appliance
If both primary canines were present, what appliance could be used in place of a Nance
appliance (maxillary fixed bilateral space maintainer)? - Answers Band and loop (bilateral)
What situation is a Nance appliance appropriate for? - Answers Premature bilateral loss of
maxillary primary teeth
What are the 4 properties of ideal wire material? - Answers 1. High strength
2. Low stiffness
3. High working range
4. High formability
Stainless steel wire characteristics - Answers - good mechanical properties
- excellent corrosion resistance
- low cost
- highest modulus of elasticity
- lowest spring back
- 18% chromium, 8% nickel
Stainless steel vs nickel titanium orthodontic wires - Answers Stainless steel has a high
modulus of elasticity and a lower resilience
NiTi orthodontic wire characteristics - Answers Offer a highly desirable combination of low
modulus of elasticity and extremely wide working range
Benefits of the Hawley retainer? - Answers - palatal coverage makes it possible to incorporate a
bite plant lingual to the upper incisors to control bite depth
-
What is the major source of anchorage in a Hawley appliance? - Answers Palatal coverage
Prior to direct bonding, ________ is used as an etching agent. Prior to placing bands, ________ is
used as an etching agent? - Answers 35-50% unbuffered phosphoric acid
Nothing
Indications for using bands instead of banded brackets? (4) - Answers 1. To provide better
, anchorage for greater tooth movement
2. For teeth that will need both lingual and labial attachment
3. Teeth with short clinical crowns
4 Tooth surfaces that are incompatible with successful bonding
What is the "anchorage value" of any tooth? - Answers It is roughly equivalent to its root surface
area (the same as the periodontal ligament area)
What are the 5 anchorage types? - Answers 1. Reciprocal tooth movement: is produced when
two teeth or resistance units of equal size are moved against each other and move the same
amount toward or away from each other.
2. Reinforced anchorage: is accomplished by adding additional teeth to the unit to distribute the
force over a larger root surface area in the anchorage unit. Note: Another method for reinforcing
anchorage would be to add an extraoral force such as headgear or interarch elastics.
3. Stationary anchorage: displacement of anchor teeth can be minimized by arranging the force
system so that anchor teeth must move bodily (translation) if at all, while movement teeth are
allowed to tip. This approach is called "stationary anchorage."
4. Cortical anchorage: anchor teeth roots are moved into cortical bone which resorbs more
slowly than does medullary bone. This situation may be encountered at an old extraction site, it
can be almost impossible to close such an extraction site, because tooth movement is slowed
to a minimum as the roots encounter cortical bone along the resorbed alveolar ridge.
5. Implants for anchorage: implants can serve as anchorage for holding or moving teeth. The
implant (if stable) will not move because it has no PDL
Cervical-pull headgear - Answers consists of a cervical neck strap (as anchorage) and a
standard facebow inserting into the headgear tubes of the maxillary first molar attachments.
The objectives of treatment with these types of headgear are to restrict anterior growth of the
maxilla and to distalize and erupt maxillary molars.
