The objectives for the extension of the proximal margins are all except:
Correct Answer: The location of the final proximal margins should be established with No.245 bur
Description: The objectives for the extension of the proximal margins are to:
Include all caries lesion, defects or existing restorative material.
Create approximately 90o cavosurface margins (i.e., butt-joint margins).
Establish (ideally) not more than 0.5 mm clearance with the adjacent proximal surface facially, lingually, and gingivally.
The location of the final proximal margins (i.e., facial, lingual, gingival) should be established with hand instruments (i.e., chisels, hatchets, trimmers) and not the No.245 bur, so as to prevent unnecessary overextension.
Reference: Sturdevant operative dentistry. 7th EDITION, Page No:341
Category:
Dental
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now