occlusion development Flashcards
gum pads
segmented mucosa overlying the primary teeth at birth
anterior segments are
separated (natural open bite)
environmental factors that can affect occlusion
- systemic diseases
- habits
- trauma
- infections
- caries
- iatrogenic factors
incisal contact is established at
1 year of age
when does oral hygiene begin
at birth!
gum pads around the erupting tooth cause it to look
swollen
flap of skin above took will be resorbed by
apoptosis
when should you start using a tooth brush (and ONLY water)
16 months
-occlusal surface visible (first molar)
when can a child use a toothbrush
can use a fork and knife, and tie their shoelaces
-ie. the ability to
root formation is complete by
3 years of age
drift
- genetic
- natural movement of teeth if there is a space
- permanent teeth only
- PRIMARY TEETH DONT DRIFT
shift
- movement of tooth if pushed
- primary and permanent
primary space is found where
- max: between 2 and 3
- mand: between 3 and 4
overbite
% overlap of central incisors when in occlusion
overbite ___ with eruption of permanent teeth
decreases
normal overbite for primary
0-60%
normal overbite for permanent
10-30%
overjet
mm measurement from incisal edge of upper ci to labial surface of lower ci
normal overjet for primary
0-3 mm
normal overjet for permanent
1-3mm
baume classification of spacing
type I: spaced
type II: non spaced
arch length usually
remains the same
the spacing between teeth after complete eruption
remains the same
the terminal place relationship usually
remains the same
primary arch form is
congential
straight terminal plane w primate space
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!
straight terminal plane w NO primate space
- 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)
mesial step
-erupt into class I without altering neighbouring teeth
marked mesial step
class III
distal step
class II
6 keys to normal occlusion
- molar relationship
- crown angulation
- crown inclination
- rotations
- spaces
- occlusal planes
crown angulation
teeth angle distally
crown inclination
max incisors = positive torque (labial surface is proclined)
all other teeth = negative torque
-posterior: increasing lingual inclination
