NBDE Part 2 - Orthodontics UPDATED ACTUAL Questions
and CORRECT Answers
Indirect bonding technique bonding -more complex
requires -technique sensitive
-extra precautions
indirect bonding 1. accurate impression with alignate is taken and poured up
with orthodontic model stone
2. vertical lines are drawn on the teeth to lay brackets
3. brackets are loaded with a filled resin paste and cured
4. individual positioning of tray with silicone is prepared by
applying it over the bracket teeth on plaster model
5. place in warm water to dissolve the separating media
6. silicone tray is then removed from the plaster model with
brackets embedded in it
7. brackets are cleaned under running water to make sure that
pads have cured resin
8. enamel is etched, conditioned and unfilled resin is applied
9. silicone tray with embedded brackets is then positioned on
teeth and bonded
types of appliances equal and opposite forces: elastic band stretched between
two brackets produces equal and opposite forces
one couple appliance: inserted into a bracket at one end and
tied as a point contact at the other.
two couple appliances: inserted into a bracket at each end.
both a couple and a force are produced at each end. The
magnitude of the couple is largest at the end closer to the
bend in the wire.
All the sum of the forces are 0.
, functional appliances examples Tissue borne: frankel functional appliance is the only tissue
borne functional appliance, which serves to expand the arch
by "padding" against the pressure of the lips and cheeks on
the teeth and postures the mandible forward and downward
toothborne:
-activator: advances the madible to an edge to edge position
to induce mandibular growth for the correction of class 2
malocclusion. Maxillary teeth are prevented from erupting by
the acrylic shelf while mandibular posterior teeth are free to
erupt. This improves the deep bite seen in class 2.
-bionator: similar to the activator in function but its design is
trimmed down version of the activator to make it more
comfortable to wear
-herbst: fixed or removable. metal rod and tube telescopic
apparatus is attached bilaterally to the maxillary first molars
and mandibular first premolars. This helps to posture the
mandibule forward and induce growth.
-twin block appliance: 2 piece acrylic appliance postures the
mandible forward with help of occlusally inclined guiding
planes and bite blocks. the vertical seperation of the jaws is
also configued by the height of the bite block. It postures the
mandibular forward to induce growth.
functional appliances changes the posture of the mandible, holding it open or open
and forward. strech of the muscles and soft tissues creates
pressures transmitted to the dental and skeletal structures,
moving teeth and modifying growth. they are used to treat
class 2 malocclusion
quad helix fixed appliance that consists of 4 helix (2 anterior, 2 posterior),
used for posterior cross bite with digital sucking habit
lip bumper -removable
-placed on the molars to move them more distal
-maintain space
-removes the pressure from the mandibular lip (allow for less
crowding)
anchorage used to maintain space
traction is used to create space
headgear is an orthopedic appliance that -control growth of facial structures
allows ortho to -various designs
-growing patients
and CORRECT Answers
Indirect bonding technique bonding -more complex
requires -technique sensitive
-extra precautions
indirect bonding 1. accurate impression with alignate is taken and poured up
with orthodontic model stone
2. vertical lines are drawn on the teeth to lay brackets
3. brackets are loaded with a filled resin paste and cured
4. individual positioning of tray with silicone is prepared by
applying it over the bracket teeth on plaster model
5. place in warm water to dissolve the separating media
6. silicone tray is then removed from the plaster model with
brackets embedded in it
7. brackets are cleaned under running water to make sure that
pads have cured resin
8. enamel is etched, conditioned and unfilled resin is applied
9. silicone tray with embedded brackets is then positioned on
teeth and bonded
types of appliances equal and opposite forces: elastic band stretched between
two brackets produces equal and opposite forces
one couple appliance: inserted into a bracket at one end and
tied as a point contact at the other.
two couple appliances: inserted into a bracket at each end.
both a couple and a force are produced at each end. The
magnitude of the couple is largest at the end closer to the
bend in the wire.
All the sum of the forces are 0.
, functional appliances examples Tissue borne: frankel functional appliance is the only tissue
borne functional appliance, which serves to expand the arch
by "padding" against the pressure of the lips and cheeks on
the teeth and postures the mandible forward and downward
toothborne:
-activator: advances the madible to an edge to edge position
to induce mandibular growth for the correction of class 2
malocclusion. Maxillary teeth are prevented from erupting by
the acrylic shelf while mandibular posterior teeth are free to
erupt. This improves the deep bite seen in class 2.
-bionator: similar to the activator in function but its design is
trimmed down version of the activator to make it more
comfortable to wear
-herbst: fixed or removable. metal rod and tube telescopic
apparatus is attached bilaterally to the maxillary first molars
and mandibular first premolars. This helps to posture the
mandibule forward and induce growth.
-twin block appliance: 2 piece acrylic appliance postures the
mandible forward with help of occlusally inclined guiding
planes and bite blocks. the vertical seperation of the jaws is
also configued by the height of the bite block. It postures the
mandibular forward to induce growth.
functional appliances changes the posture of the mandible, holding it open or open
and forward. strech of the muscles and soft tissues creates
pressures transmitted to the dental and skeletal structures,
moving teeth and modifying growth. they are used to treat
class 2 malocclusion
quad helix fixed appliance that consists of 4 helix (2 anterior, 2 posterior),
used for posterior cross bite with digital sucking habit
lip bumper -removable
-placed on the molars to move them more distal
-maintain space
-removes the pressure from the mandibular lip (allow for less
crowding)
anchorage used to maintain space
traction is used to create space
headgear is an orthopedic appliance that -control growth of facial structures
allows ortho to -various designs
-growing patients
