NEET MDS Shorts
35990
Conservative DentistryThe process of condensation (compaction) of gold foil in dentistry involves cold-welding layers of gold to build a solid restoration. As the gold is compacted, a phenomenon known as work hardening occurs, which increases the material's hardness and strength.
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.
89212
Conservative Dentistry
The direction of the force is the most critical factor for the adaptation of gold foil to cavity walls because the force must be directed at a \(45^{\circ }\) angle to the cavity wall to ensure proper condensation and a tight seal.
54331
Conservative DentistryComposite resin is the material of choice for restoring anterior teeth angle fractures due to its aesthetic qualities, ability to bond directly to the tooth structure, and conservative preparation requirements.
33675
Conservative DentistryExplanation: In a Class V amalgam restoration, the occlusal wall (or the wall facing the occlusal surface) is typically wider than the gingival wall (the wall facing the gingiva). This design feature helps to provide adequate bulk for the restoration, ensuring strength and resistance to fracture. The other options, such as retention undercuts and wall convergence, are not characteristic features of Class V restorations, which are primarily concerned with the gingival and occlusal relationships.
51501
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.
79402
Conservative DentistryPitting of a direct gold filling is primarily caused by improper stepping of the condenser, which leads to inadequate condensation and a lack of homogeneity in the gold layers. This results in voids and porosities that manifest as pitting on the surface.
95165
Conservative Dentistry
54726
Conservative DentistryWhen 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
32929
Conservative Dentistry