Lec 4.3.3: Measurements - Direct Retainer

Question 1

Retentive arm of simple akers

Answer 1

14 or #16 1/2 round (tapering)

Question 2

Reciprocal arm of simple akers

Answer 2

14 or #16 1/2 round (non-taper)

Question 3

Part of retentive clasp (simple akers) engaging the undercut

Answer 3

Terminal 1/3 of clasp

Question 4

Degree of abutment encirclement by the clasp

Answer 4

Greater than 180 degree

Question 5

Clearance of the approaching arm of RPI from gingival margin

Answer 5

2-3mm

Question 6

Ideal position of the retentive clasp on the abutment

Answer 6

Cervical 1/3

Question 7

Ideal position of the reciprocal clasp on the abutment

Answer 7

Junction of the middle & cervical 1/3

Question 8

I-bar exits from this area of the mesh

Answer 8

Between pontics

Question 9

I-bar

Answer 9

Tapered wax #12 1/2 round

Question 10

Maximum number of direct retainers

Answer 10

4 (2 per quadrant)

Question 11

Tip of retentive arm (simple akers)

Answer 11

Curved slightly upward

Question 12

Bilateral configuration of the direct retainer

Answer 12

2 direct retainers

Question 13

Triangular configuration of the direct retainer

Answer 13

3 direct retainers

Question 14

Quadrilateral configuration of the direct retainer

Answer 14

4 direct retainers