Before Midterm: Review of Partial Denture Design

Question 1

TF? Circumferential clasps can be used for distal extension:

Answer 1

F

Question 2

TF? Circumferential clasps are stress releasing.

Answer 2

F

Question 3

Important consideration for deeper UC’s:

Answer 3

use wrought wire

Question 4

UC needed for T clasp:

Answer 4

DB

Question 5

TF? We always need an indirect retainer for a D extension.

Answer 5

T

Question 6

How to avoid tori?

Answer 6

anterior posterior bar

Question 7

What might prevent the use of a cingulum rest on the canine in some cases?

Answer 7

occlusal contact

Question 8

Indications for survey crown:

Answer 8

extensive caries, large restorations, excessive wear, unusalbe contours, severe tipping (less than 30’), no usable UC, severe extrusion, endo treated teeth, need for splinting (for proper resistance form of crown), iatrogenic damage, anticipation of future partial denture

Question 9

TF? The indications for a survey crown are the same as for a full coverage crown.

Answer 9

T

Question 10

Adv fo survey crowns:

Answer 10

choice of clasp type optimized, ideal GP’s, precise retentive UC’s, ideal reciprocal surface, ideal rest shape

Question 11

Probelms that can happen if you make abutment tooth crowns without a plan for rests seats, GPs, or clasps:

Answer 11

must be remade or modified, risking porcelain fracture

Question 12

Steps to make survey crown:

Answer 12

tx plan. Complete tooth mods for partial RDP, Prep crown(s), impression for crown(s), cement crown(s), make partial RDP impression for framework

Question 13

TF? Tooth modifications are done first then the crown is prepared for survey crowns.

Answer 13

T

Question 14

Benefit to making tooth mods on unrestored abutments for survey crowns first:

Answer 14

optimum contours can be developed during fabrication of crown (technician waxes up to existing contours of other abutments), more effective than trying to perform tooth mods after crown insertion.

Question 15

TF? When prepping a tilted tooth for a survey crown, it should be prepped according to the long axis of the tooth

Answer 15

F. POI of the partial

Question 16

What will happen if you prep a tilted tooth to the long axis and not the poi of partial?

Answer 16

overtapering

Question 17

Which surface to prep 1st for a tilted tooth to be survey crowned?

Answer 17

Surface that requires the greatest amt of reduction

Question 18

How much to reduce side opposite the direction of the tilt:

Answer 18

only enough to get ideal taper and space for crown

Question 19

TF? A tipped tooth can sometimes be used if you can recontour alone

Answer 19

T

Question 20

Which side will require more reduction for a tilted tooth, the side to which the tooth is tilted or the opposite?

Answer 20

the side to which the tooth is tilted

Question 21

Purpose of tripoding master cast for the lab:

Answer 21

can place survey crown on survey crown and develop the GP, etc to the POI

Question 22

When to check the contours of a survey crown from the lab:

Answer 22

Before pts appt