IOTN key points Flashcards
MOCDO
missing teeth overjets crossbites displacement of contact points overbites
5i
impacted teeth (except 8s)
5h
extensive hypodontia (>1 in a quadrant)
5a
OJ >9mm
5m
reverse OJ >3.5mm, masticatory and speech difficulties
5p
defects CLP and other CF anomalies
5s
submerged deciduous teeth
hierarchy for grade 5
5i 5h 5a 5m 5p 5s
4h
less extensive hypodontia
4a
increased OJ >6mm less than or equal to 9mm
4b
reverse OJ >3.5mm, no masticatory or speech difficulties
4m
reverse OJ >1mm <3.5mm, masticatory and speech difficulties
4c
A/P CBs with >2mm discrepancy between RCP and ICP
4l
posterior lingual CB with no fct occlusal contact in one or both buccal segments
4d
contact displacements >4mm
4e
extreme lateral or AOBs >4mm
4f
increased and complete OB with gingival or palatal trauma
4t
PE teeth, tipped and impacted against adjacent teeth
4x
supernumeraries
hierarchy for grade 4
4h 4a 4b 4m 4c 4l 4d 4e 4f 4t 4x
3a
increased OJ >3.5mm less than or equal to 6mm with incompetent lips
3b
reverse OJ >1mm less than or equal to 3.5mm
3c
A/P CBs >1mm but less than or equal to 2mm discrepancy between RCP and ICP
3d
contact displacements >1mm less than or equal to 3.5mm
3e
lat/AOB >2mm less than or equal to 4mm
3f
deep OB complete on gingival or palatal tissues, but no trauma
hierarchy grade 3
3a 3b 3c 3d 3e 3f
grade 1
extremely minor malocclusions inc contact displacements <1mm
2a
increased OJ >3.5mm less than or equal to 6mm with competent lips
2b
reverse OJ >0mm less than or equal to 1mm
2c
A/P CB less than or equal to 1mm discrepancy RCP and ICP
2d
contact point displacements >1mm less than or equal to 2mm
2e
A/P open bite >1mm less than or equal to 2mm
2f
increased OB more than or equal to 3.5mm without gingival contact
2g
pre-normal or post-normal occlusion with no other anomalies (incs up to half a unit discrepancy)
hierarchy grade 2
2a 2b 2c 2d 2e 2f 2g
what should you do if an occlusal trait is borderline?
assign the lower DHC grade
