occlusion development

Question 1

gum pads

Answer 1

segmented mucosa overlying the primary teeth at birth

Question 2

anterior segments are

Answer 2

separated (natural open bite)

Question 3

environmental factors that can affect occlusion

Answer 3

• systemic diseases
• habits
• trauma
• infections
• caries
• iatrogenic factors

Question 4

incisal contact is established at

Answer 4

1 year of age

Question 5

when does oral hygiene begin

Answer 5

at birth!

Question 6

gum pads around the erupting tooth cause it to look

Answer 6

swollen

Question 7

flap of skin above took will be resorbed by

Answer 7

apoptosis

Question 8

when should you start using a tooth brush (and ONLY water)

Answer 8

16 months

-occlusal surface visible (first molar)

Question 9

when can a child use a toothbrush

Answer 9

can use a fork and knife, and tie their shoelaces

-ie. the ability to

Question 10

root formation is complete by

Answer 10

3 years of age

Question 11

drift

Answer 11

• genetic
• natural movement of teeth if there is a space
• permanent teeth only
• PRIMARY TEETH DONT DRIFT

Question 12

shift

Answer 12

• movement of tooth if pushed

- primary and permanent

Question 13

primary space is found where

Answer 13

• max: between 2 and 3

- mand: between 3 and 4

Question 14

overbite

Answer 14

% overlap of central incisors when in occlusion

Question 15

overbite ___ with eruption of permanent teeth

Answer 15

decreases

Question 16

normal overbite for primary

Answer 16

0-60%

Question 17

normal overbite for permanent

Answer 17

10-30%

Question 18

overjet

Answer 18

mm measurement from incisal edge of upper ci to labial surface of lower ci

Question 19

normal overjet for primary

Answer 19

0-3 mm

Question 20

normal overjet for permanent

Answer 20

1-3mm

Question 21

baume classification of spacing

Answer 21

type I: spaced

type II: non spaced

Question 22

arch length usually

Answer 22

remains the same

Question 23

the spacing between teeth after complete eruption

Answer 23

remains the same

Question 24

the terminal place relationship usually

Answer 24

remains the same

Question 25

primary arch form is

Answer 25

congential

Question 26

straight terminal plane w primate space

Answer 26

undergoes EARLY MESIAL SHIFT => CLASS I

• closes the lower primate space
• allows the upper 6 to fit in a cusp-groove relationship
• upper primate space doesnt close!

Question 27

straight terminal plane w NO primate space

Answer 27

• end to end (cusp to cusp) relationship of the 6s

- LATE MESIAL SHIFT to get it to class I (after Es are shed, leeway space)

Question 28

mesial step

Answer 28

-erupt into class I without altering neighbouring teeth

Question 29

marked mesial step

Answer 29

class III

Question 30

distal step

Answer 30

class II

Question 31

6 keys to normal occlusion

Answer 31

1. molar relationship
2. crown angulation
3. crown inclination
4. rotations
5. spaces
6. occlusal planes

Question 32

crown angulation

Answer 32

teeth angle distally

Question 33

crown inclination

Answer 33

max incisors = positive torque (labial surface is proclined)
all other teeth = negative torque
-posterior: increasing lingual inclination