10 Questions
What is the purpose of the Reverse S Curve shape in a Class II amalgam preparation?
Improves resistance to amalgam fracture
Why is the axial wall of a Class II amalgam preparation typically made convex?
To strengthen the preparation and improve amalgam retention
What is the primary benefit provided by the gingival floor of a Class II amalgam preparation?
Improves adaptation of the restoration to the cavity walls
Why is the buccal wall of a Class II amalgam preparation designed to meet the tooth surface at a 90˚ exit angle?
To maximize resistance form and prevent restoration deformation
What is the significance of creating a retention groove in a Class II amalgam preparation?
Enhances retention of amalgam material within the cavity
What is the purpose of ensuring Gingival Contact is open at least 0.5 mm in Class II Amalgam Preparation?
To prevent caries in the etched area below the contact
What should be the mesiodistal thickness of the marginal ridge in Class II Amalgam Preparation according to the lab manual?
0.6-0.8 mm
What does Step 3 involve in Class II Amalgam Preparation according to the provided text?
Ditching for the box
What motion is recommended while ditching for the box in Class II Amalgam Preparation?
Pendulum motion
How much should the walls converge in Class II Amalgam Preparation according to the lab manual?
3˚-4˚ each
Learn to identify and differentiate between the various parts of a Class II Amalgam preparation, including reverse S curve, lingual wall, buccal wall, axiopulpal line angle bevel, and gingival floor. Understand the specific shapes and angles involved in each part.
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