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NEET MDS Shorts

54726
Conservative Dentistry

When punching holes to place a rubber dam for a class V cavity on the facial surface, punching holes larger and facially provides better access and visibility. This allows for easier placement and removal of the dam, as well as less risk of damaging the adjacent tissue

53240
Conservative Dentistry

One of the main disadvantages of composite materials in Class II posterior restorations is their susceptibility to occlusal wear, which can compromise the longevity of the restoration.

62474
Conservative Dentistry

The CAD-CAM system utilizes digital imaging, often through a video camera or scanner, to capture the prepared tooth for designing restorations.

84343
Conservative Dentistry

The upper limit of urinary mercury attributed to extensive amalgam restoration is typically considered to be 4 micrograms/g of creatinine. While the actual limit can vary based on the individual and the extent of amalgam fillings, a level of 4 micrograms/g of creatinine is commonly used as a benchmark for evaluating potential health concerns related to mercury exposure from dental amalgam.

35827
Conservative Dentistry

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.

20927
Conservative Dentistry

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.

59632
Conservative Dentistry

A shoulder margin provides adequate bulk for the porcelain to prevent fracture and allows for a better aesthetic outcome and marginal seal for a porcelain jacket crown.

 A chamfer margin is generally used for metal or metal-ceramic crowns, 

 a knife-edge margin is rarely used due to poor definition and inadequate resistance form.

19030
Conservative Dentistry

Gingivally, the depth of a class V cavity is typically 0.75-1 mm. This depth is sufficient to provide a good bond with the tooth structure and prevent microleakage without causing significant gingival irritation or damage.

37925
Conservative Dentistry

Failure of a cast to seat properly on the cast during the restoration process can be due to various factors such as distortion during fabrication or changes in the cast material. To overcome this, the cast can be scraped with a sharp instrument to remove any excess material that may be preventing proper seating. Washing the casting with HCI (hydrochloric acid) may help to clean and smooth the surface, but it is not a common practice for this specific purpose. Forcefully positioning the casting can cause damage to the cast and is not recommended. If the discrepancy is more than 0.3 mm, it is generally advised to discard the cast and make a new one to ensure a precise and accurate fit.

86515
Conservative Dentistry

Annealing gold foil is the process of heating gold to remove impurities and restore its cohesion properties. 

Annealing of gold foil is a heat treatment process used to alter the physical and sometimes chemical properties of the material. The primary purpose of annealing gold foil is to remove any contaminants and stresses that may be present on the surface of the material. This is achieved by heating the gold foil to a specific temperature, typically around 400°C (750°F), and then allowing it to cool slowly. The process can also help in improving the foil's ductility, making it more malleable and easier to work with. However, the direct effect of annealing on the rigidity, ductility, and proportional limit is not explicitly stated in the question, and thus the correct answer is that annealing of gold foil primarily serves to remove contaminants from the surface.

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