- What are dental cements, and why are they used in dentistry?
- Dental cements are materials used in dentistry for various purposes, such as bonding, filling, and sealing dental structures.
- What are the primary components of dental cements?
- Dental cements typically consist of a powder and a liquid component.
- What is the main component of the powder in dental cements?
- The primary component of the powder is usually an inorganic compound, such as zinc oxide or glass particles.
- What is the main component of the liquid in dental cements?
- The liquid component is often composed of an acidic solution, which can be water or an organic acid.
- How is the setting reaction initiated in dental cements?
- The setting reaction in dental cements is initiated by mixing the powder and liquid components.
- What is the role of water in the setting reaction of dental cements?
- Water is necessary for the setting reaction as it reacts with the components in the powder to form a solid matrix.
- What type of dental cement is commonly used for luting (cementing) crowns and bridges?
- Zinc phosphate cement is commonly used for luting crowns and bridges.
- What are the components of zinc phosphate cement?
- Zinc oxide powder and phosphoric acid liquid are the primary components of zinc phosphate cement.
- What is the working time of zinc phosphate cement, and how is it determined?
- The working time of zinc phosphate cement is determined by the ratio of powder to liquid, and it is typically around 3-6 minutes.
- What is the main disadvantage of zinc phosphate cement?
- It can irritate the pulp and has low tensile strength.
- Which dental cement is often used for temporary restorations and temporary crowns?
- Zinc oxide eugenol cement is commonly used for temporary restorations and temporary crowns.
viva question and answers related to zinc polycarboxylate cement
- What is the major component of zinc oxide eugenol cement?
- Zinc oxide and eugenol (clove oil) are the primary components.
- What are the advantages of zinc oxide eugenol cement?
- It has sedative properties and can be used as a temporary filling material.
- What is the drawback of using zinc oxide eugenol cement in some cases?
- It should not be used in direct contact with composite resins as it can inhibit their polymerization.
- Which dental cement is known for its excellent adhesion to enamel and dentin?
- Glass ionomer cement is known for its adhesion to enamel and dentin.
- What are the main components of glass ionomer cement?
- Glass ionomer cement consists of a glass powder and an aqueous solution of polyacrylic acid.
- How does the setting reaction occur in glass ionomer cement?
- The setting reaction involves an acid-base reaction between the glass powder and polyacrylic acid.
- What is the main advantage of glass ionomer cement in restorative dentistry?
- It releases fluoride ions, which can help prevent secondary caries.
- Which dental cement is commonly used for permanent cementation of metal and ceramic restorations?
- Resin-modified glass ionomer cement is often used for permanent cementation of such restorations.
- What is the major difference between traditional glass ionomer and resin-modified glass ionomer cements?
- Resin-modified glass ionomer contains resin, which enhances its physical properties and adhesion.
- What is the primary component of resin-modified glass ionomer cement?
- It contains a mixture of glass powder, polyacrylic acid, and resin.
- What is the setting mechanism of resin-modified glass ionomer cement?
- It sets through a combination of acid-base reaction and light-curing of the resin.
- Which dental cement is known for its high strength and durability?
- Composite resin cement is known for its high strength and durability.
- What are the key components of composite resin cement?
- Composite resin cement contains a resin matrix and inorganic fillers, similar to restorative composite materials.
- How is composite resin cement cured?
- It is cured using a dental curing light, which activates the polymerization process.
- What is the main advantage of composite resin cement over other cements?
- It offers superior aesthetics and is suitable for bonding esthetic restorations.
- Which dental cement is commonly used for temporary cementation of crowns and bridges?
- Temporary resin cement is often used for temporary cementation.
- What is the main component of temporary resin cement?
- The primary component is a resin material with a low degree of conversion.
- What is the purpose of using temporary resin cement?
- It allows for easy removal of temporary restorations when needed.
- How can you remove excess cement after the placement of a dental restoration?
- Excess cement can be removed using scalers, floss, and by curing and then removing any uncured resin-based cement.
