RPI -Lec 4

Question 1

Location of the fulcrum for a distal extension.

Answer 1

The rest

Question 2

The proximal plate in an RPI extends ____ mm above the gingival portion of the guide plane.

Answer 2

1

Question 3

What kind of rest is the mesial rest in an RPI?

Answer 3

Ball and socket.

Question 4

Location of the rest in an RPI.

Answer 4

Mesial

Question 5

Extension of the proximal plate in an RPI.

Answer 5

Past the DL line anglee.

Question 6

Requires relief gingivally.

Answer 6

RPI proximal plate

Question 7

The proximal plate is what width of the cusps?

Answer 7

2/3

Question 8

Occlusal loading of an RPI causes the I bar to move…

Answer 8

Apically and mesially.

Question 9

The I bar is placed ___ to the rotational axis of an RPI.

Answer 9

Distal

Question 10

Encirclement for an RPI comes from:

Answer 10

1) Minor connector
2) Guide plane
3) I bar

Question 11

A longer proximal plate…

Answer 11

Moves the axis of rotation from the mesial rest to the proximal plate.

Question 12

The prevent distal movement in an RPI.

Answer 12

1) Minor connector

2) I bar

Question 13

Contraindications to an RPI:

Answer 13

1) Insufficient undercut
2) Severe rotation of the abutment
3) Severe mesial inclination of the abutment (prevents correct creation of the guide plane)
4) Height of the floor of the mouth -> Less than 8 mm distance requires the use of a lingual plate, which moves the rotational axis from the rest to the area of plate contact.