Development of Primary Dentition

Question 1

what are the characterisitcs of the deciduous dentition

Answer 1

• symmetrical crown shapes
• interdental spacing
• no angulation of the incisors
• less variability in occlusal relationships than the permanent dentition
• arch width changes with growth

Question 2

where are primate spaces found

Answer 2

in deciduous dentition, mesial to upper cuspids and distal to lower cuspids

Question 3

if there is no interdental spacing in the deciduous dentition_____

Answer 3

crowding of permanent dentition will occur

Question 4

what are diastemas between anterior primary teeth important for

Answer 4

to get space for permanent incisor eruption

Question 5

the upper incisors erupt to the _____ of the primary teeth. lower incisors erupt ____ to the primary teeth

Answer 5

labial; lingual

Question 6

there is no _______ in the arch size during the eruption of the permanent incisors

Answer 6

significant increase

Question 7

anterior primary teeth are ____ than anterior permanent teeth

Answer 7

smaller

Question 8

some primary posterior teeth are ____ than the posterior permanent teeth

Answer 8

larger

Question 9

how big is the permanent upper second premolar

Answer 9

7 mm

Question 10

how big is the upper second primary molar

Answer 10

8.2 mm

Question 11

how big is the lower second permanent premolar

Answer 11

7 mm

Question 12

how big is the lower second primary molar

Answer 12

9.9 mm

Question 13

what is the occlusal plane

Answer 13

an imaginary surface that passes through the occlusion of the teeth

Question 14

describe the occlusal plane

Answer 14

• usually curved
  -commonly approximated by one line based on specific reference points within the arches
• maxillary occlusal plane passes through the occlusal cusps of the posterior teeth and incisal edges of the maxillary incisors
• mandibular occlusal plane is tangent to the occlusal cusps of the posterior teeth and the incisal edges of the mandibular incisors

Question 15

primary teeth are positioned _____ to the occlusal plane

Answer 15

90 degrees

Question 16

in the primary dentition the curve of spee is ____

Answer 16

flat

Question 17

what are dentoalveolar compensations

Answer 17

response of the dentoalveolar process to the skeletal dysplasis or to functional disturbance

Question 18

if a malocclusion is diagnosed in primary dentition it will probably:

Answer 18

get worse during growth

Question 19

what are the occlusal relations in deciduous dentition

Answer 19

• upper and lower incisors are vertical
• minimal overbite and overjet
• upper canine tip is positioned in the embrasure between the lower canine and the first primary molar

Question 20

in deciduous dentition, normal occlusal changes are due to _____

Answer 20

skeletal growth not from dental changes

Question 21

altering functional environment or neuromuscular pattern or introducing habits such as digit sucking can:

Answer 21

alter skeleton and occlusion resulting in malocclusion

Question 22

what are the disorders of the deciduous dentition

Answer 22

• unfavorable skeletal patterns lead to malocclusion
• ectopic dental eruption may lead to malocclusion

Question 23

what are skeletal malocclusions

Answer 23

the upper and/or lower jaws are not aligned properly in relation to cranial base

Question 24

what influences skeletal malocclusions

Answer 24

genetics

Question 25

missing primary teeth is:

Answer 25

rare