2013 #4 Crown Preparation Designs: An Evidence-Based Review Author: Soukup

Question 1

What happens to retention and resistance as CA decreases?

Answer 1

Retention and resistance increases

Question 2

What can also increase retention and resistance?

Answer 2

Larger H/D ratio
Increased surface area
axial groves

Question 3

Are subgingival preparations recommended to increase retention and resistance?

Answer 3

No, although there are minor gains in retention and resistance form there is the potential for deleterious effects on the periodontium

Question 4

What are 5 potential negative outcomes associated with subgingival margins?

Answer 4

1 increased plaque accumulations
2 gingival inflammation
3 deep pocket formation
4 attachment loss
5 gingival recession