Cavity Liners and Varnishes

The video tutorial covers the use of cavity liners, bases, and varnishes in dental procedures. Cavity liners are thin layers applied to protect pulpal tissue, while bases are thicker layers providing insulation and protection. Varnishes are resin solutions that prevent microleakage and protect restorations. The tutorial explains the composition, application, and benefits of each material, emphasizing their roles in dental restoration and protection.

What is the primary purpose of applying cavity liners?

• To protect pulpal tissue from chemical irritation

• To enhance the color of the tooth

• To increase the size of the cavity

• To make the tooth more sensitive

When should cavity liners be applied based on remaining dentinal thickness (RDT)?

• When RDT is more than 5 mm

• When RDT is less than 0.5 mm

• When RDT is exactly 1 mm

• When RDT is between 2 mm and 3 mm

What is the main component of cavity liners?

• Zinc oxide

• Resin

• Calcium hydroxide

• Fluoride

What is the typical thickness range for cavity bases?

• 0.1 to 0.3 mm

• 0.5 to 0.75 mm

• 2 to 3 mm

• 1 to 1.5 mm

Which of the following is NOT used as a material for cavity bases?

• Zinc phosphate cement

• Zinc polycarboxylate cement

• Calcium hydroxide

• Reinforced zinc oxide eugenol cement

What is the primary function of cavity varnish?

• To increase the size of the cavity

• To serve as a barrier between restoration and dentinal tubules

• To make the tooth more sensitive

• To add color to the restoration

How thick are varnishes typically applied?

• 2 to 5 microns

• 10 to 15 microns

• 30 to 35 microns

• 20 to 25 microns

Which type of varnish is used to prevent tooth decay in young children?

• Antimicrobial varnish

• Fluoride varnish

• Desensitizing varnish

• Tooth whitening varnish

What is the purpose of applying varnish layerwise?

• To make it more sensitive

• To change the color

• To increase the thickness

• To ensure even application

Based on curing, how are varnishes classified?

• By taste

• By color

• By thickness

• Physically cured or chemically cured