angle's classification Flashcards
normal occlusion
molar relationship + line of occlusion
for normal Class I occlusion, what fits in what
MB cusp (upper first molar) fits in MB groove (lower first molar)
all posterior upper teeth are __ to the lower counterpart
distal
3 intra-maxilary deviations
- misaligned teeth (rotations, irregularity)
- spacing
- crowding
4 inter-maxillary deviations
- crossbite
- overjet
- overbite
- molar relationship
class II malocclusion
MB cusp is mesial to MB groove
divisions of class II malocclusion
0 - normal
1 - proclined max inc
2-retroclined max inc
class III malocclusion
MB cusp is distal to MB groove
class I cuspid
upper canine is slightly distal to lower (normal)
class II cuspid
upper canine is mesial/forward (ends up tip to tip)
class III cuspid
upper canine is distal (tip of 3 is with tip of 4)
subdivisions
used to classify occlusion if only ONE side deviates from class I occlusion
occlusion changed bc premature loss of tooth and subsequent drift
mutilation
teeth move bc loss of tooth
drifting
what guides the eruption of the lower 1st permanent molar
primary 2nd molar
mesial step
lower E is mesial to upper E
distal step
lower E is distal to upper E
flush plane becomes
class I or class II
mesial step (1mm) becomes
class I or class III
distal step becomes
ALWAYS class II
primary spaces
mandible - distal to canine
maxilla - mesial to canine
early mesial shift
mesial movement of 1st permanent molars into primate spaces
leeway space
difference bt width of deciduous and permanent
late mesial shift
mesial movement of 1st permanent molars into leeway space
