Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
|
What should the depth of a class V be?
|
just into dentine 1mm-1.25 due to thinner enamel toward cervical
|
|
|
What do you need to be mindful of in a Class V?
|
pulp as can be closer to the surface
|
|
|
What is the general shape of the gingival margin?
|
usually curved following gingival tissue margin
|
|
|
What angulation should you have when preparing a class V?
|
perpendicular to the surface, slight changes to the orientation of the hand piece because of convexity of surface
|
|
|
Where is caries removed from?
|
DEJ
|
|
|
What are retentive features in a Class V?
|
all walls slightly divergent
locks or grooves placed |
|
|
Where are the grooves placed?
|
45* angles toward occlusal or gingival walls, not directly in either wall (assuming just inside DEJ)
|
|
|
Where do grooves need to be?
|
in dentine
|
|
|
What won't composite bond to?
|
dentine, so could get leakage due to crevicular fluid as there is less enamel
|
|
|
If doing a comp on a Class V what do you need to do to cavo surface?
|
bevel
|
|
|
Why do you bevel?
|
allows etch to open up enamel rods to get micromechanical locking,
bevel only enamel margins |
|
|
For a comp class V when might you need to use locks and grooves?
|
large preps of the gingival wall on cementum
|
|
|
should you clean tooth before doing rest if close to gingival margin?
|
best to clean and get OH under control so less bleeding
|
|
|
What is polymerisation?
|
shrinking of comp resin
|
|
|
Why do you restore abrasion?
|
so that it doesn't get to pulp
|
