Conservative Dentistry Shorts - NEET MDS Dental PG Prep

#1 Conservative Dentistry

Resin 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.

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Answer

The cement which is least soluble in oral cavity
1) Glass ionomer
2) Resin cement
3) Polycarboxylate cement
4) Silico-phosphate cement

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#2 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.

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Answer

Gingivally the depth of a class V cavity is
1. 0.5-1 mm
2. 0.75-1 mm
3. 1-1.25 mm
4. 2-3 mm

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#3 Conservative Dentistry

Amount of force needed to condense direct filling gold depends on the surface area of the condenser. The larger the surface area, the less pressure is required to achieve proper condensation. The force applied affects the compaction of the gold, but it is the size and shape of the condenser point that dictate the actual pressure exerted on the material.

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Answer

Amount of force needed to condense direct filling gold depends on
1. Angle of compaction
2. Surface area of the condenser
3. Amount of the remaining dentin
4. Type of direct filling gold

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#4 Conservative Dentistry

Aluminium oxide (Al₂O₃) is primarily derived from bauxite, which is an ore that contains a high percentage of aluminium. The Bayer process is commonly used to extract aluminium oxide from bauxite.

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Answer

Aluminium oxide polishing powder is obtained from
1) Aluminium
2) Cryolite
3) Bauxite
4) Vulcanite

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#5 Conservative Dentistry

Porcelain 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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Answer

The main advantage exhibited by the porcelain compared to the tooth coloured restorations
1) Good marginal integrity
2) High tensile strength
3) Better colour hormony
4) Highly insoluble

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#6 Conservative Dentistry

Acid etching is a dental procedure that creates a micromechanical bond between the tooth surface and a restorative material. This bonding process significantly reduces microleakage, which is the microscopic space between the tooth and the restoration where bacteria and fluids can penetrate.

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Answer

Acid etching significantly reduces
1) Microleakage
2) Setting shrinkage
3) Coefficient of thermal expansion
4) All of the above

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#7 Conservative Dentistry

Surface defects in porcelain act as stress concentrators, which can lead to crack initiation and propagation when the restoration is under load.

Filling these defects before the final glazing and firing process helps to eliminate these weak points, thereby increasing the overall strength and durability of the finished porcelain inlay.

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Answer

Surface defects in porcelain inlay should be filled before glazing to
1) Obtain good aesthetic effect
2) To obtain smooth surface
3) To obtain uniform surface glaze
4) Increase the strength of the finished restoration

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#8 Conservative Dentistry

Explanation: In a conventional Class III amalgam cavity preparation, the axial wall should be straight and parallel to the long axis of the tooth. This design ensures that the restoration has adequate resistance form and is less likely to dislodge under occlusal forces. The wall being deeper incisally than gingivally helps to maintain the integrity of the tooth structure and provides a stable base for the amalgam restoration.

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Answer

In conventional class III amalgam cavity preparation the axial wall in inciso gingival direction should be
1. Straight and parallel to the long axis of the crown, deeper incisally than gingivally
2. Convex and parallel to the long axis of the tooth
3. Concave and parallel to the incisogingival contour of the tooth
4. None of the above

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#9 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.

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Answer

The best gingival margin for porcelain jacket crown
1) Chamfer
2) Knife edge
3) Shoulder
4) None of the above

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