Development of the Primary and permanent dentition Part I

Question 1

how many teeth are there in the deciduous dentition

Answer 1

20 teeth

Question 2

first molars erupt ______ to the primary dentition

Answer 2

distal

Question 3

what age do the permanent teeth erupt

Answer 3

6-13 years old

Question 4

how many teeth are in the permanent dentition

Answer 4

32

Question 5

what is the eruption pattern of the mandibular arch

Answer 5

• central incisor: 6-10 months
• lateral incisor: 10-16 months
• first molar: 14-18 months
• canine: 17-23 months
• second molar: 23-31 months

Question 6

what is the exfoliation pattern of the mandibular arch

Answer 6

• central incisor: 6-7 years
• lateral incisor: 7-8 years
• first molar: 9-11 years
• canine: 9-12 years
• second molar 10-12 years

Question 7

what is the emergence pattern of the maxillary arch

Answer 7

• central incisor: 8-12 months
• lateral incisor: 9-12 months
• first molar: 13-19 months
• canine: 16-22 months
• second molar: 25-33 months

Question 8

what is the exfoliation pattern of the maxillary arch

Answer 8

• central incisor: 6-7 years
• lateral incisor: 7-8 years
• first molar: 9-11 years
• canine: 10-12 years
• second molar: 10-12 years

Question 9

where are primate spaces found

Answer 9

mesial to upper cuspids and distal to lower cuspids

Question 10

what is the probability that if there is no interdental spacing in the deciduous dentition that there will be crowding in the permanent dentition

Answer 10

75%

Question 11

_____ between anterior primary teeth are important to get space for permanent incisor eruption

Answer 11

diastemas

Question 12

the upper incisors erupt _____ of primary teeth

Answer 12

labial

Question 13

the lower incisors erupt ______ of the primary teeth

Answer 13

lingual

Question 14

there is ________ in arch size after the eruption of the permanent incisors

Answer 14

no significant increase

Question 15

are the primary incisors angled

Answer 15

no

Question 16

the crown shapes are _____

Answer 16

symmetrical

Question 17

anterior teeth are _____ than permanent teeth

Answer 17

smaller

Question 18

some primary posterior teeth are _____ than their successor

Answer 18

larger

Question 19

how big is the upper second premolar

Answer 19

7mm

Question 20

how big is the upper second primary molar

Answer 20

8.2mm

Question 21

how big is the lower second premoalr

Answer 21

7mm

Question 22

how big is the lower second primary molar

Answer 22

9.9mm

Question 23

what is the occlusal plane

Answer 23

an imaginary surface that passes through the occlusion of the teeth

Question 24

describe the occlusal plane

Answer 24

usually curved and is not a plan but approximated by a straight line in the lateral view based on specific reference points within the dental arches

Question 25

where does the maxillary occlusal plane pass thorugh

Answer 25

the occlusal cups of the posterior teeth and the incisal edges of the maxillary incisors

Question 26

where does the mandibular occlusal plane pass through

Answer 26

tangent to the occlusal cusps of the posterior teeth and the incisal edges of the mandibular incisors

Question 27

primary teeth are positioned ____ _to the occlusal plane

Answer 27

90 degrees

Question 28

are permanent teeth positioned 90 degrees to the occlusal plane

Answer 28

no

Question 29

what part of the permanent tooth pushes out the primary tooth

Answer 29

the follicle

Question 30

what is the curve of spee

Answer 30

the curve displayed in the sagittal plane (parallel with the body of the mandible) by the cusps and incisal edges of the mandibular teeth. the convex aspect of the curve of spee is pointing inferiorly

Question 31

at what age is the intercanine width of the mandible established

Answer 31

8-9 years old

Question 32

who developed the curve of spee and what was their original idea

Answer 32

F. Graf Von Spee in 1890
- theorized that the extension of this curve would be tangent to the anterior surface of the mandibular condyles bilaterally

Question 33

in the primary dentition the curve of spee is:

Answer 33

flat

Question 34

if a malocclusion is diagnoses in the primary dentition it will probably:

Answer 34

get worse during growth

Question 35

what are the occlusal relations in the deciduous dentition

Answer 35

• 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 36

what is overjet

Answer 36

the distance between the labial surface of the mandibular incisors and the labial aspect of the incisal edge of the maxillary incisors usually measured parallel to the occlusal plane

Question 37

when not otherwise specified the term “overjet” is assumed to refer to:

Answer 37

the most prominent central incisors

Question 38

the extend of the overjet is determined primarily by:

Answer 38

the differences of labiolingual position and inclination of the maxillary and mandibular central incisors

Question 39

how often is the anteroposterior skeletal relationship reflected directly in the amount of overjet

Answer 39

only in a minority of cases

Question 40

the first primary tooth appears around the age of_____ and by ______ all primary teeth should be present.

Answer 40

8 months, 30 months