Lab 3 Measurement Analysis: Down's Analysis & Steiner's Analysis

Question 1

This is one of the most frequently used cephalometric analysis, consisting of 10 parameters (5 skeletal, 5 dental).

Answer 1

Down’s analysis

Question 2

What are the 3 limitations of Down’s analysis?

Answer 2

1. Too many landmarks
2. Too many measurements
3. Time consuming

Question 3

What are the 5 skeletal parameters (Down’s)?

Answer 3

1. Facial angle
2. Angle of convexity
3. A-B plane angle
4. Mandibular plane angle
5. Y-axis (growth axis)

Question 4

What are the 5 dental parameters (Down’s)?

Answer 4

1. Cant of occlusal plane
2. Inter-incisal angle
3. Incisor occlusal plane angle
4. Incisor mandibular plane angle
5. Upper incisor to A-pog line

Question 5

This analysis is developed with an idea of providing maximal information with the least number of measurements.

Answer 5

Steiner’s analysis

Question 6

Steiner’s analysis are divided into 3 parts, which are..?

Answer 6

• Skeletal
• Dental
• Soft tissue

Question 7

What are the 5 skeletal analysis (Steiner’s)?

Answer 7

1. SNA Angle
2. SNB Angle
3. ANB Angle
4. Mandibular plane angle
5. Occlusal plane angle

Question 8

What are the 5 dental analysis (Steiner’s)?

Answer 8

1. Upper incisor to N-A (angle)
2. Upper incisor to N-A (linear)
3. Inter-incisal angle
4. Lower incisor to N-B (angle)
5. Lower incisor to N-B (linear)

Question 9

The facial contour line on Steiner’s soft tissue analysis, formed by drawing a line on the soft tissue contour of the chin to the middle of the lower border of the nose, is called..?

Answer 9

S line