Crowding

Question 1

List methods of measuring crowding

Answer 1

Contact point displacements

Brass wire to measure tooth to arch ratio

Question 2

What are the measurements to differentiate between the amount of
crowding?

MILD

Answer 2

Less than 4 mm

Question 3

What are the measurements to differentiate between the amount of
crowding?

MODERATE

Answer 3

More than 4mm-8 mm

Question 4

What are the measurements to differentiate between the amount of
crowding?

SEVER

Answer 4

More than 8mm

Question 5

Describe removable space maintainer

Answer 5

Removable appliance
• base plate
• cribs 4’s 6’s
• labial bow or Southend clasp

Question 6

Describe fixed space maintainer

Answer 6

Band and loop.
Band placed around an erupted tooth and a soldered loop for the space

Question 7

What are the potential/documented causes of late lower incisor crowding in the untreated patient?

Answer 7

• Inherent mesial migration
• Facial growth pattern/rotation
• Soft tissue pressures
• Jaw size decreasing with age
• Narrow contact points of lower incisors

Question 8

What is “Bolton” analysis?

Answer 8

Bolton analysis is the comparison of the tooth sizes of the maxilla and mandible.

Anterior (6 front teeth), ideal 77.2%

Overall (12 teeth), ideal 91.3%

This is calculated by
Sum of mandible teeth
Sum of maxillary teeth X 100 ꓿ ……%