Coffee #2 Document pt. 3 Flashcards
The paranasal sinus which lies directly beneath the sella turcica is the?
a. Sphenoid
b. Maxillary
c. Posterior ethmoidal
d. Frontal
e. Mastoid
Sphenoid
Articulation what structure with C1 permits the rotation of the head?
Odontoid process (Dens)
What causes the rotation of the head?
a. occiput
b. C1
c. C2
c. C2
Atlas C1 - back and forth
Axis C2 - rotation
What is the widest cervical vertebrae from C1 to C5
C1
How many bones are in the craniofacial complex?
a. 8 cranial
b. 14 facial
c. 22 total
d. All of the above
d. All of the above
What kind of bone is fetal bone
a. Lamellar
b. Woven
c. Spongy
b. Woven
Put in order of organization
a. Woven > Composite > Bundle > Lamellar
b. Woven > Composite > Lamellar
c. Woven > Composite > Lamellar > Bundle
c. Woven > Composite > Lamellar > Bundle
What kind of bone is formed after initial ortho movement?
Woven
What is the difference between primary osteons and secondary osteons?
a. Primary osteons is woven bone
b. Primary bone is fine woven bone
c. Primary osteon has ordered osteocytes
d. Primary osteons has canaliculi perpendicular to medullary canal
a. Primary osteons is woven bone
What is the primary osteon?
a. Woven bone
b. Mature spongy bone
c. Mature cancellous bone
d. Cartilage
a. Woven bone
The adult bone is remodeled by?
Secondary osteons
Osteomyelitis is most commonly caused by:
a. Actinomyces bovis
b. Borrelia vincenti
c. Staphylococcus aureus
d. Mycobacterium tuberculosis
c. Staphylococcus aureus
Osteoclasts come from?
a. bone marrow
b. blood
c. PDL
d. Bone
a. Bone marrow
- from monocytes (marrow, hematopotetic)
What is the source of osteocytes?
Osteoblasts
From where do cells for bone deposition originate?
a. Osteoclasts
b. Blood
c. Mesenchyme cells
d. Chondrocytes
c. Mesenchyme cells
Bone formation starts as what?
Mesenchymal condensation
Most of the osteoclasts present in the PDL are
a. Of hematogenous origin
b. Derived from stem cells found in the local area
c. Highly differentiated fibroclasts
d. Always associated with an inflammatory condition
A. of hematogenous origin
Bone tissue grows by what type of growth?
a. Interstitial growth
b. Osteoclastic activity
c. Proliferation of endodermal tissues
d. Differentiation of cartilaginous tissue
Differentiation of cartilaginous tissue
Osteopetrosis appears on the XR as:
a. Radiolucency
b. Radioopacity
c. Honeycomb appearance
d. Ground glass appearance
b. Radioopacity
What happens in osteopetrosis?
a. Increased radiopacity
b. Decreased radiopacity
c. a Honeycombed appearance of bone
a. Increased radiopacity
The tension side of tooth movement has what components histologically?
a. Woven bone
b. Fibrous tissue
c. Both
c. Both
Rate of bone remodeling
a. Increases with age
b. Decreases with age
c. Remains the same
d. None of the above
b. Decreases with age
Histochemically basal bone and alveolar bone
a. Are vastly different
b. Basal bone is more resistant to resorption
c. Are no different
d. Alveolar bone is less cancellous
c. Are no different
Movement of bony segments in space, without any internal or localized changes, is called:
a. Translation
b. Conduction
c. Transformation
d. Does not occur
a. Translation
Development of the body of the mandible involves:
a. Reichert’s cartilage
b. A complete cartilage model
c. Intramembranous bone formation
d. All of the above
e. None of the above
c. Intramembranous bone formation
Which bone is purely intramembranous?
a. parietal and frontal
b. ethmoid
c. temporal
a. Parietal and frontal
How are the parietal and frontal bones formed?
a. Partly by endochondral bone formation
b. Partly by intramembranous bone formation
c. Entirely by endochondral bone formation
d. Entirely by intramembranous bone formation
d. Entirely by intramembranous bone formation
How is the sphenoid bone form?
a. Partly by endochondral bone formation
b. Entirely by endochondral bone formation
c. Entirely by intramembranous bone formation
a. Partly by endochondral bone formation
Which part of the face has both intramembranous and endochondral sutures
a. Upper and middle
b. Upper and lower
c. Middle and lower
d. Upper only
a. Upper and middle
Intramembranous bone formation comes from:
a. Condensation of mesenchyme
b. Endoderm
c. Ectoderm
a. Condensation of mesenchyme
Which of the following tissues does NOT grow interstitially?
a. Muscle
b. Bone
c. Nerve
d. Connective tissue
b. Bone
The cranial base grows by what mechanism?
a. Intramembranous
b. Endochondral
c. appositional
b. Endochondral
In an .022 slot size system, the maximal slot size measurements are:
a. 18x25
b. 22x22
c. 22x28
d. 22x25
e. 25x22
f. 25x22
c. 22x28
Increased bond strength of ceramic brackets was achieved by:
a. 30% adhesive filler concentration
b. 55% adhesive filler concentration
c. 80% adhesive filler concentration
d. all of the above
c. 80% adhesive filler concentration
Thermal debond of brackets is an alternative to usual technique. Ceramic brackets debonded by thermal means, both more time & a higher temp are required than for debonding of SS brackets, assuming a two paste adhesive system used:
a. True
b. False
True
The use of zinc phosphate cements for ortho purposes differs from its use in restorative dentistry in that:
a. The liquid for orthodontic purposes contains less free phosphoric acid
b. The cement for orthodontic purposes is mixed thicker
c. Mixing techniques for orthodontic purposes do not use a frozen slab
d. Little bare metal not coated with cement is tolerated on interior surfaces of an orthodontic band
b. The cement for orthodontic purposes is mixed thicker
The safest and preferred site of failure when brackets are removed is:
a. The interface between enamel surface and bonding material
b. Within the bonding material itself
c. The interface between brackets surface and bonding material
d. Any of the above
c. The interface between brackets surface and bonding material
All the following are current recommendations for safer debonding of ceramic brackets, except:
a. Selecting brackets with mechanical retention between the base and the adhesive
b. Inducing an asymmetric torquing stress on the bracket
c. Using a laser to weaken the adhesive
d. Concentrating the force at the bracket-adhesive interface
b. Inducing an asymmetric torquing stress on the bracket
When compared to metal brackets, a problem associated w/ ceramic brackets is increased friction due to roughness of bracket interface
a. True
b. False
True
What percentage of impacted canines self-correct if the tip is distal to the middle of the lateral incisor?
a. 10
b. 30
c. 50
d. 70
e. 90
90%
64% if crossed the midline
What is the percent of permanent canines that come in lingually, when primary canines are extracted (distal to the lateral)?
91%
Which one is not true about Impacted canines?
30% of them come palatal
**85% are palatal
When extracting a lateral and replacing with the canine what is not important
Buccal occlusion on side not affected
Intercanine distance upon eruption of permanent canines
a. Increases significantly
b. Increases a little
c. Decreases
b. Increases a little
Most common transpositioned tooth
Canine
A picture of a pano is shown and you are asked what is obvious
Caries
Panoramic radiographs are least useful in demonstrating which of the following?
a. Supernumerary teeth
b. Arch perimeter deficiencies
c. congenitally missing teeth
d. Axial inclination of teeth
e. Apical development of permanent teeth
b. Arch perimeter deficiencies
When eval radiographically which teeth show greatest variation relative to the onset of mineralization of teh crowns of permanent teeth
a. Maxillary canines
b. Mandibular 2nd molars
c. Mandibular 2nd premolars
d. Maxillary lateral incisors
e. Maxillary first molars
c. Mandibular second premolars
What is the significance of a short posterior cranial base?
a. Mandibular prognathism
b. Anterior cross-bite
c. Maxillary retrognathism
d. All of the above
d. All of the above
Class III
A shorter horizontal measured from Ar to PTM indicates what?
a. Maxillary hyperplasia
b. Maxillary hypoplasia
c. Mandibular hyperplasia
d. Mandibular hypoplasia
b. Maxillary hypoplasia
