Design principles of the direct retainers by “Ney” system Flashcards
1
Q
Survey line
A
- Line drawn on teeth to determine position of clasps
- Marks HOC
2
Q
High survey lines are due to
A
Abnormal inclination of teeth
3
Q
Medium survey lines are due to
A
Slight occlusal-gingival incline
4
Q
Low survey lines are due to
A
Marked inclination of teeth
5
Q
Clasp function
A
- Retentive component of removable appliance
- Helps retain appliance and resist displacement
- Engage into undercuts
