Orthodontics and Pediatric Dentistry (NDEB of Can) || 100%
Correct Answers.
What Angles class does 50-55% of the population fall into? correct answers Class I malocclusion
What kind of bone formation is formed first by cartilage, the transformed into bone? correct
answers Endochondral bone formation
What is the process called whereby bone is formed by secretion of bone matrix directly within
connective tissues, without intermediate formation of cartilage? correct answers
Intramembranous bone formation
What 3 maxillofacial develop through means of intramembranous bone formation? correct
answers 1) Cranial vault 2) Maxilla 3) Mandible
3 bones of the cranial base that are formed via endochondral bone formation; correct answers 1)
Ethmoid 2) Sphenoid 3) Occipital
Where does growth in the maxilla take place? correct answers At the sutures, posterior and
superior to the maxilla at its connections to the cranium and cranial base
In which direct does the maxilla grow? correct answers Downward and forward
How does growth of the mandible differ from growth of the maxilla? correct answers Growth is
both endochondral and intramembranous
Where in the mandible does endochondral growth take place? correct answers Condyle of the
mandible
Which embryologic structures gives rise to the mandible? correct answers Meckel's cartilage
,Wich tissues grow most rapidly at birth? correct answers Neural tissue
Which tissue develops second fastest after neural tissue? correct answers Lymphoid tissue
When is peak growth for girls? correct answers 12 yo
When is peak growth for boys? correct answers 14 yo
What is the most common craniofacial defect? correct answers Clefting of the lip or palate or
both
At what time in development does cleft lip or other facial clefts take place? correct answers Day
28-38
At what time in development does cleft palate alone take place? correct answers Days 42-55
What habits commonly lead to open bite in children? correct answers Thumb/finger-sucking
habits
Where are the two "primate spaces" located during the primary dentition phase? correct answers
1) Lateral incisior and canine in the maxilla 2) Canine and first primary molar in the mandible
Define flush terminal plane occlusion: correct answers The distal aspect of the second deciduous
maxillary and mandibular molars are at the same sagittal level
Define mesial step occlusion: correct answers The mandibular terminal plane is mesial to the
maxillary terminal plane
,Define distal step occlusion: correct answers The mandibular terminal plane is distal to the
maxillary terminal plane.
During the mixed dentition phase, what determines the molar classification? correct answers The
terminal plane relationship
What is considered the "ugly duckling phase" of mixed dentition? correct answers As the
maxillary central incisors erupt, they move labially, and a temporary diastema is often present
between them.
If a young patient has a flush terminal plane relationship, what occlusal scheme could they
possibly develop? correct answers 1) Class I (56% of time) 2) Class II (44% of time)
If a young patient as a mesial step molar relationship, what type off occlusion will they most
likely develop? correct answers Class I (could be class III depending on the severity of the
mesial step)
What is leeway space? correct answers The difference in mesiodistal size between the primary
canine, primary first molar, and primary second molar and their permanent replacements
What is the average leeway space in the mandibular arch? correct answers 2.5mm
What is the leeway space measures in the maxillary arch? correct answers 1.5mm
What is considered the normal overbite percentage? correct answers 10-20%
What is the normal overjet value? correct answers 1-3mm
, How is arch length measured? correct answers Measured at the midline from a point midway
between the central incisors to a tangent touching the distal surfaces of the second primary
molars or the mesial surfaces of the first permanent molars.
Two reasons for a decrease in arch length with age; correct answers 1) Uprighting of incisors 2)
loss of leeway space
Tooth eruption in females is earlier than males by how many months? correct answers 5M
When do primary dentition begin calcification in utero? correct answers Third and fourth month
When does eruption of the primary teeth begin? correct answers 6-7th month
What is the typical sequence of primary tooth eruption? correct answers Central incisors
(51,61,71,81), lateral incisors (52,62,72,82), first primary molar (54,64,74,84), canine
(53,63,73,83), second primary molar (55,65,75,85)
When do permanent teeth begin calcification? correct answers Shortly after birth
Provide the eruption sequence for the mandibular arch: correct answers 1) First molar 2) central
incisor 3) Lateral incisor 4) canine 5) first premolar 6) second premolar 7) second molar 8) third
molar
What is the eruption sequence of the maxillary arch? correct answers 1) First molar 2) Central
incisor 3) lateral incisor 4) first premolar 5) second premolar 6) canine 7) second molar 8) third
molar
What is class I malocclusion? correct answers The MB cusp of the max. first molar is in the
buccal groove of the mand. first molar but the intraarch relationships are abnormal.
Correct Answers.
What Angles class does 50-55% of the population fall into? correct answers Class I malocclusion
What kind of bone formation is formed first by cartilage, the transformed into bone? correct
answers Endochondral bone formation
What is the process called whereby bone is formed by secretion of bone matrix directly within
connective tissues, without intermediate formation of cartilage? correct answers
Intramembranous bone formation
What 3 maxillofacial develop through means of intramembranous bone formation? correct
answers 1) Cranial vault 2) Maxilla 3) Mandible
3 bones of the cranial base that are formed via endochondral bone formation; correct answers 1)
Ethmoid 2) Sphenoid 3) Occipital
Where does growth in the maxilla take place? correct answers At the sutures, posterior and
superior to the maxilla at its connections to the cranium and cranial base
In which direct does the maxilla grow? correct answers Downward and forward
How does growth of the mandible differ from growth of the maxilla? correct answers Growth is
both endochondral and intramembranous
Where in the mandible does endochondral growth take place? correct answers Condyle of the
mandible
Which embryologic structures gives rise to the mandible? correct answers Meckel's cartilage
,Wich tissues grow most rapidly at birth? correct answers Neural tissue
Which tissue develops second fastest after neural tissue? correct answers Lymphoid tissue
When is peak growth for girls? correct answers 12 yo
When is peak growth for boys? correct answers 14 yo
What is the most common craniofacial defect? correct answers Clefting of the lip or palate or
both
At what time in development does cleft lip or other facial clefts take place? correct answers Day
28-38
At what time in development does cleft palate alone take place? correct answers Days 42-55
What habits commonly lead to open bite in children? correct answers Thumb/finger-sucking
habits
Where are the two "primate spaces" located during the primary dentition phase? correct answers
1) Lateral incisior and canine in the maxilla 2) Canine and first primary molar in the mandible
Define flush terminal plane occlusion: correct answers The distal aspect of the second deciduous
maxillary and mandibular molars are at the same sagittal level
Define mesial step occlusion: correct answers The mandibular terminal plane is mesial to the
maxillary terminal plane
,Define distal step occlusion: correct answers The mandibular terminal plane is distal to the
maxillary terminal plane.
During the mixed dentition phase, what determines the molar classification? correct answers The
terminal plane relationship
What is considered the "ugly duckling phase" of mixed dentition? correct answers As the
maxillary central incisors erupt, they move labially, and a temporary diastema is often present
between them.
If a young patient has a flush terminal plane relationship, what occlusal scheme could they
possibly develop? correct answers 1) Class I (56% of time) 2) Class II (44% of time)
If a young patient as a mesial step molar relationship, what type off occlusion will they most
likely develop? correct answers Class I (could be class III depending on the severity of the
mesial step)
What is leeway space? correct answers The difference in mesiodistal size between the primary
canine, primary first molar, and primary second molar and their permanent replacements
What is the average leeway space in the mandibular arch? correct answers 2.5mm
What is the leeway space measures in the maxillary arch? correct answers 1.5mm
What is considered the normal overbite percentage? correct answers 10-20%
What is the normal overjet value? correct answers 1-3mm
, How is arch length measured? correct answers Measured at the midline from a point midway
between the central incisors to a tangent touching the distal surfaces of the second primary
molars or the mesial surfaces of the first permanent molars.
Two reasons for a decrease in arch length with age; correct answers 1) Uprighting of incisors 2)
loss of leeway space
Tooth eruption in females is earlier than males by how many months? correct answers 5M
When do primary dentition begin calcification in utero? correct answers Third and fourth month
When does eruption of the primary teeth begin? correct answers 6-7th month
What is the typical sequence of primary tooth eruption? correct answers Central incisors
(51,61,71,81), lateral incisors (52,62,72,82), first primary molar (54,64,74,84), canine
(53,63,73,83), second primary molar (55,65,75,85)
When do permanent teeth begin calcification? correct answers Shortly after birth
Provide the eruption sequence for the mandibular arch: correct answers 1) First molar 2) central
incisor 3) Lateral incisor 4) canine 5) first premolar 6) second premolar 7) second molar 8) third
molar
What is the eruption sequence of the maxillary arch? correct answers 1) First molar 2) Central
incisor 3) lateral incisor 4) first premolar 5) second premolar 6) canine 7) second molar 8) third
molar
What is class I malocclusion? correct answers The MB cusp of the max. first molar is in the
buccal groove of the mand. first molar but the intraarch relationships are abnormal.
