NEET MDS Shorts
71200
Conservative DentistryDuring 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.
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Conservative DentistryExplanation: When dealing with adjacent Class III cavities, it is generally recommended to prepare the larger cavity first and fill it last. This approach allows the dentist to have better access and visibility when preparing the larger cavity, which can be more complex. Filling the larger cavity last helps to avoid contamination and ensures that the smaller cavity can be filled with precision without compromising the integrity of the larger restoration.
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Conservative DentistryFor a class V gold restoration, the mesial and distal cavity margins should end at the line angles of the tooth to ensure proper adaptation and prevent overhangs. This is important for both functional and aesthetic reasons
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Conservative DentistryPorcelain restorations are known for their superior esthetics, primarily due to their ability to mimic the natural color, translucency, and harmony of natural teeth, which is a significant advantage over other tooth-colored restorations like composite resins.
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Conservative DentistryIn 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.
10444
Conservative DentistryComposites, particularly in dentistry (e.g., dental composites), are typically retained by the phenomenon of mechanical interlocking. This process involves creating microscopic irregularities on the surface of a material (like a tooth) and then flowing a bonding agent or composite material into these spaces, which then hardens.
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Conservative DentistryThe axial wall in class V cavity in transverse section appears convex mediodistally and uniformly placed in the dentin. This is because the cavity is typically shallower in the center and deeper towards the line angles, providing a good seal and preventing food and plaque accumulation.
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Conservative Dentistry
The final polish of a cast gold alloy to achieve a smooth polished surface is
done by
1) Pickling: This is a process used to remove oxides and impurities from the
surface of a metal before applying a final finish. However, it does not provide
the final polish.
2) Electropolishing: This technique uses an electrical current to dissolve the
metal surface and create a smooth finish, but it is not commonly used for gold
alloy restorations.
3) Sandblasting: This method involves propelling an abrasive material against
the metal surface to smooth and clean it, but it is too aggressive for the final
polish of a gold alloy restoration.
4) Rouge: Rouge is a fine abrasive paste used with a polishing wheel or point to
achieve the final polish on a cast gold alloy restoration. It removes minor
imperfections and gives a high luster to the metal.
The correct answer is 4) Rouge, as it is the standard technique for achieving a
smooth, polished surface on cast gold alloys.
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Conservative DentistryOne 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.
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Conservative DentistryResin cements have the lowest solubility in the oral cavity due to their hydrophobic nature and polymerization process, which makes them highly resistant to water sorption and dissolution.