Overjet Reduction

Question 1

What is an average overjet?

Answer 1

2-4mm

Question 2

What is the definition of overjet?

Answer 2

The extent of horizontal overlap of maxillary teeth over mandibular teeth

Question 3

What are the causes of an increased overjet?

Answer 3

• skeletal
• dental - proclined upper, retroclined lower
• soft tissues - lip trap
• habits

Question 4

What are advantages of sliding mechanics?

Answer 4

• minimal wire bending
• less time consuming
• easier to maintain arch form compared with closing loops

Question 5

What are the disadvantages of sliding mechanics?

Answer 5

• high friction compared with closing loops
• can have uncontrolled tipping if on a light wire
• loss of anchorage