Dental Retention form of endodontics is: A Creation of an apical stop to prevent extrusion of material of beyond apex. B Creation of nearly parallel walls in apical 3rd to give tug back to master cone. C Access should be expanded so that the instrument do not bind. D None of the above 💡 Explanation Retention form of endodontics is: ✓ Correct Answer: B. Creation of nearly parallel walls in apical 3rd to give tug back to master cone.