Eastman Analysis

Question 1

general
* what is a cephalogram
* what is the anlysis of this called
* purpose of this
* what do SNA and SNB do
* what shows the relationship of the jaws to each other

Answer 1

• cephalogram = standardised radiograph
• eastman analysis = analysis of this
• view relationship between the jaws, the jaws and the cranial base, position of the teeth compared to the jaws, soft tissue profile
• relationship of jaws to the base of the skull
• FMPA and ANB

Question 2

meanings

Answer 2

1. SNA - sella, nasion, maxillary base
2. SNB - sella, nasion, mandibular base
3. ANB - maxillary base, nasion, mandibular base
4. MxP/MnP - maxilalry plane (anterior nasal spine to posterior nasal spine), mandibular plane (mention to gonion) - parallel with frankfort plane line from orbitalle to porion
5. UI/MxP = angle of upper incisors to maxillary plane
6. LI/MnP = angle of lower incisors to manidbular plane
7. LAFH/TAFH = lower AFH divided by Total AFH
8. SN/Mxp = cranial base to maxillary plane angle

Question 3

avg values

Answer 3

1. SNA = 81 +/-3
2. SNB = 78 +/-3
3. ANB = 3 +/-2
4. MxP/MnP = 27 +/-4
5. UI/MxP = 109 +/-6
6. LI/MnP = 93 +/-6
7. LAFH/TAFH = 55%

Question 4

severity of class I, II and III skeletal classes based off ANB

Answer 4

class II
* mild = 4-6 dicrepancy
* moderate = 6-8
* severe = >8
-
class III
* mild = 0-2
* moderate = -3-0
* severe = >-3