Ceph Skeletal Vertical Measurements

Question 1

Anterior Nasal Spine to Menton

Answer 1

Lines = ANS - Menton

Measure (mm) = ANS - Menton

Indicates = vertical height of skeletal lower face

Norm = determined from chart; use correct maxillary or mandibular measurement

Question 2

Mandibular Plane to Frankfort Horizontal

Answer 2

Lines = FH and MP

Measure = angle at back of face

Indicates = vertical of mandible; ramus height; face height and muscles

Norm = Adult Male = 23 +/- 4 degrees

Adult Female = 24 +/- 4 degrees

Question 3

Mandibular Plane to Sella Nasion Plane

Answer 3

Lines = SN and Mandibular Plane

Measure = Angle at back of face

Indicates = vertical of mandible; ramus height; face height and muscles

Norm = 32 +/- 5 degrees

Question 4

High MP Angle Facial Pattern

Answer 4

Norm = 32 +/- 5 degrees

This pic = 49 degrees (+3 SD)

Steep mandibular plane

Obtuse gonial angle

Long lower face height

Anterior Open bite

Child - vertical growth

Weak muscles of mastication

Question 5

Low MP Angle Facial Pattern

Answer 5

Low Mandibular Plane

More acute gonial angle

Short lower face height

Anterior deep bite

Child = horizontal growth

Strong muscles of mastication

Tooth wear and fracture

Question 6

Upper 1st Molar to Palatal Plane (U6-PI)

Answer 6

Lines = ANS - PNS; Buccal cusp to palatal pl

Measure (mm) = right angle to palatal plane

Indicates = vertical ht posterior max

Norm = Females = 25 +/- 2mm

Males = 28 +/- 3mm

Question 7

Basion-Nasion to Pterygoid Pt-Gnathion

Answer 7

Lines = BaN - PtGn

Measure = posterior inferior angle

Indicates = facial vertical; adult = vertical indicator; child = mandible grows normally along this axis

Norm = 90 +/- 4 degrees