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CS1
lower borders of all 3 vertebrae are flat
bodies of C3 and C4 are trapezoid shape
mandibular peak growth occurs on average 2 years after CS1
CS2
concavity at lower border of C2 in 80%'
C3 and C4 are still trapezoid shaped
peak growth is a year or so ahead
ideal stages to begin functional jaw orthopaedics for skeletal class III with mx deficiency
CS3
concavities at lower borders of both C2 and C3
C3 and C4 are either trapezoid or rectangular horizontal shaped
peak growth is less than 1 year ahead
ideal stage to begin functional jaw orthopaedics for class II
CS4
concavities at the lower borders of both C2, C3 and C4
bodes of C3 and C4 are rectangular horizontal shaped
typically a year beyond peak growth
CS5
concavities at lower borders of both C2, C3 and C4
at least one of the bodies of C3 or C4 is square, other is still rectangular horizontal shaped
more than 1 year beyond peak growth, with more vertical than AP growth remaining
CS6
concavities at lower borders of both C2, C3 and C4
at least one of the bodies of C3 or C4 is rectangular vertical, the other is square shaped
more than 2 years beyond peak growth