‘Sandwich technique’ of restoration of carious lesion involves application of following materials

 # ‘Sandwich technique’ of restoration of carious lesion involves application of following materials:

A. Dycal/GIC/Composites

B. Dycal/GIC/Phosphate

C. Phosphate/Miracle mix/Amalgam

D. ZOE/Amalgam/Composite

The correct answer is A. Dycal/GIC/Composites

When composite is placed over an RMGI material, this technique is often referred to as a ‘sandwich’ technique. The potential advantages of this technique are:

- The RMGI material bonds to the dentin without the need for a dental adhesive

- The RMGI material, because of its bond to dentin and potential for fluoride release (potential anti-cariogenicity), may provide a better seal when used in cases where the preparation extends gingivally onto root structure

- The favourable elastic modulus of the RMGI may reduce the effects of polymerization shrinkage

stresses. These suggested advantages are considered controversial, as no conclusive published research

based on longitudinal clinical trials evaluating the technique is available.

Reference: Sturdevant’s Art and Science of Operative Dentistry Second South Asia Edition 2019, Page No: 504

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The root amputation procedure involving the removal of one half of the crown and one root

# The root amputation procedure involving the removal of one half of the crown and one root in a mandibular molar is called as:

A. Bi-cuspidization

B. Hemisection

C. Root resection

D. Apicoectomy 

The correct answer is B. Hemisection.

RADISECTOMY AND HEMISECTION

Definition: Radisectomy denotes the removal of one or more roots of a molar.

Hemisection refers to sectioning of the crown of a molar tooth, with either the removal of half the crown and its supporting root structure or the retention of both halves, to be used after reshaping and splinting as two premolars.

Reference: GROSSMAN’S ENDODONTIC PRACTICE 14TH EDITION, Page NO: 447

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Best technique of wedging for a patient with the gingival recession

 # For a patient with the gingival recession, The best technique of wedging is:

A. Piggy back

B. Double wedging

C. Wedge wedging

D. Single wedge

The correct answer is A. Piggy Back.

Piggy-back wedging technique

If the wedge is significantly apical of the gingival margin, a second (usually smaller) wedge may be placed on top of the first to wedge adequately the matrix against the margin. This type of wedging is particularly useful for patients whose interproximal tissue level has receded.

Reference: Sturdevant’s Art and Science of Operative Dentistry Second South Asia Edition 2019, Page No: 362

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Agent used as a die hardener

# Which of the following agents is used as a die hardener?

A. Cyanoacrylate

B. Nail polish

C. Volatile relief agents

D. Composite resin

The correct answer is A. Cyanoacrylate.

Gypsum dies are sometimes modified to (1) make them more abrasion-resistant, (2) change the dimensions of the dies, (3) increase the refractoriness of the dies, or (4) produce a combination

of these effects. Several means are used to increase the abrasion resistance, including silver plating, coating the surface with cyanoacrylate adhesive, and adding a die hardener to the gypsum.

Reference: PHILLIPS’ SCIENCE OF DENTAL MATERIALS, Anusavice, Shen, Rawls, 12th Edition, Page No: 211

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