When Using Elastomers,which of the Following Should Be Blocked Out

Multiple Choice

When using elastomers,which of the following should be blocked out with utility wax to prevent the impression material from locking under them and preventing removal of the impression tray?
1) Undercuts around bridge pontics
2) Open embrasures around periodontally involved teeth
3) Fixed implant fixtures
4) Hamular notch

A) 1,2,3,4
B) 1,2,3
C) 2,3,4
D) 1,3,4