Pulp Protection in Operative Dentistry

<p>Release of eugenol for pulp protection (C)</p> Signup and view all the answers

<p>Provide thermal insulation and pulpal protection (D)</p> Signup and view all the answers

<p>Can inhibit polymerization of composites (C)</p> Signup and view all the answers

<p>Uniform and thicker dentin bridge (D)</p> Signup and view all the answers

<p>Remaining dentin thickness (RDT) (B)</p> Signup and view all the answers

<p>It contains irregular dentinal tubules. (A)</p> Signup and view all the answers

<p>Liners are thicker than base materials. (B)</p> Signup and view all the answers

<p>To offer electrical insulation to adjacent restorations. (A)</p> Signup and view all the answers

<p>20-25 μm (A)</p> Signup and view all the answers

<p>Copal resin (C)</p> Signup and view all the answers

<p>They dry faster due to higher solvent content. (C)</p> Signup and view all the answers

<p>It ensures flexibility and rapid drying. (C)</p> Signup and view all the answers

<p>It forms as a reactionary deposit to injury. (A)</p> Signup and view all the answers

<p>To alleviate discomfort from mild-to-moderate pulpal inflammation (C)</p> Signup and view all the answers

<p>Calcium hydroxide liner (B)</p> Signup and view all the answers

<p>To provide mechanical support and distribute local stresses (D)</p> Signup and view all the answers

<p>Nontoxic and nonirritant (A)</p> Signup and view all the answers

<p>Zinc phosphate (C)</p> Signup and view all the answers

<p>Minor amounts of calcium hydroxide released from the liner (D)</p> Signup and view all the answers

<p>90% zinc oxide as the main ingredient (C)</p> Signup and view all the answers

<p>It forms a conventional type made from two separate bottles (D)</p> Signup and view all the answers

A type of dentin formed in response to injury or irritation. It forms a localized deposit.

Thin layers of material used in deep cavities beneath restorations.

Thin-film dental liners, typically 2-5 µm thick, quickly drying thin films.

Dental liners producing thicker films (20-25 µm) than solution liners.

Dental liners are classified by their thickness: thin (1-50 µm) and thick (0.2-1 mm).

Liners provide a seal, electrical isolation, and thermal insulation.

Electrical current between metallic restorations and other teeth.

A varnish is mainly copal resin (10%) dissolved in a mix of ether, alcohol, and acetone.

Used for moderately deep tooth preparations. Alleviates pulpal discomfort using eugenol's palliative action.

Used in deep tooth preparations or suspected pulp exposures. Stimulates reparative dentin and encourages dentinal bridging.

Thick cement bases used beneath restorations, providing mechanical and thermal support.

A dental cement with Zinc Oxide powder and Phosphoric acid liquid. Provides mechanical and thermal support to restorations.

A dental cement with Zinc Oxide powder and Poly-acrylic acid liquid. Forms conventional and water-settable types.

Nontoxic, insoluble, antibacterial, adheres chemically to tooth, low film thickness, matched thermal expansion, dimensionally stable on setting.

Distribute stress from the restoration to the dentin, offering thermal protection to underlying pulp.

Dental cements are typically made of powder and liquid components, combined to achieve desired properties. Different types have different elements within them.

Polycarboxylate cement is more biocompatible than zinc phosphate cement due to its lower intrinsic toxicity and a faster rise in pH towards neutrality.

Removing the smear layer from tooth surfaces (with polyacrylic acid) increases bond strength by providing a better surface for bonding materials.

Polyacrylic acid bonds chemically to tooth structure via reactions with calcium in hydroxyapatite, forming primary bonds, and also via hydrogen bonds with organic enamel/dentine constituents.

Resin-modified glass ionomer (RMGI) is a good choice for dental base material as it bonds well, releases fluoride, and has sufficient strength.

Decisions regarding using liners and bases depend on remaining dentin thickness (RDT) and the type of restorative material.

For shallow excavations, use varnish, dentin sealer, or bonding system for pulpal protection, depending on the restorative material (amalgam or composite).

For moderate excavations, a liner (like ZOE or calcium hydroxide) may be needed in areas with less-than-ideal dentin protection.

ZnO Eugenol (ZOE) is not suitable for use under composite restorations as it can inhibit the polymerization process