Guiding Planes

Question 1

Vertically parallel surfaces of abutment teeth oriented so as to contribute to the direction of the path of placement and dislodgement of removable partial dentures

Answer 1

Guiding planes

Question 2

Do flat surfaces exist on natural teeth?

Answer 2

No

Question 3

Functions of ______:
•Provide for one path of placement/removal
•Ensure the intended actions of the RPD components*
•Eliminate/decrease gross food traps**
•Increase frictional component of minor connectors
•Lowers the height of contour on proximal surfaces to allow better positioning of arms

Answer 3

Guiding planes

Question 4

For guiding plane, The large undercut adjacent to the proximal surface should be _____ in size.

Answer 4

reduced in size

Question 5

The reduction can be accomplished by ________ of the cast or by _______ of the enamel surface.

Answer 5

altering the tilt; selective grinding

Question 6

Most often, using_________, the undercut is reduced and a guiding plane is prepared.

Answer 6

selective grinding

Question 7

As length is ______, frictional retention is increased and resistance to rotation is increased

Answer 7

increased

Question 8

Width of Guiding Planes should be ______the bucco-lingual width of the tooth

Answer 8

1/3

Question 9

Width of Guiding Planes should be ______ the distance between the cusp tips

Answer 9

1/2

Question 10

For Kennedy Class 3 and 4, how long should the guiding planes be (tooth supported abutments)?

Answer 10

3-4 mm

Question 11

For Kennedy Class 1 and 2, how long should the guiding planes be (tooth-tissue supported abutments)?

Answer 11

1-2 mm