5 MCQs • Practice Free attempt
Conservative Dentistry — 5 Questions
What is the primary clinical advantage of using carbon steel over stainless steel for hand cutting instruments? 1) Corrosion resistance 2) Chemical stability 3) Ductility 4) Edge retention
Carbon steel can be made harder than stainless steel, allowing it to maintain a sharp cutting edge longer during operative procedures.
Which type of stainless steel is primarily used for the working ends of cutting instruments due to its ability to be hardened by heat treatment? 1) Austenitic 2) Martensitic 3) Duplex 4) Ferritic
Martensitic steel has a high carbon content that allows it to be hardened through quenching and tempering, making it ideal for sharp edges.
During cavity preparation, the most common area for exposure is a Class V cavity in the first premolar. A Class V cavity is a five-sided cavity that involves the gingival margin of the tooth and the proximal surface. These cavities are particularly prone to exposure because the gingival tissue in this region can be thin, and the proximity to the bone can lead to inadvertent damage during the preparation process.
In Class V restorations, which are located at the gingival third of the facial or lingual surfaces of teeth, the occlusal wall is typically wider than the gingival wall. This design helps in providing retention and resistance to the restoration, as the occlusal wall is more subject to occlusal forces.
In a Class III cavity preparation, which typically involves the anterior teeth and is located on the proximal surfaces, the axial wall is considered the base. This wall is oriented parallel to the long axis of the tooth and provides support for the restoration. The gingival wall is also important, but the axial wall is the primary base in this context.
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