MDS PREP
What are the general ideal requirements for a temporary restorative material?
1) High compressive strength and good thermal conductivity
2) Low compressive strength and good thermal conductivity
3) High compressive strength and good marginal sealing
4) Low compressive strength and good marginal sealing
Temporary restorative materials should have low compressive strength (less than 35 MP1) and good marginal sealing to facilitate easy removal and minimize thermal microleakage.
What are the requirements for a good temporary cementing agent?
1) High compressive strength and good thermal conductivity
2) Low compressive strength and good thermal conductivity
3) High compressive strength and low thermal conductivity
4) Low compressive strength and low thermal conductivity
The ideal requirements for temporary cements include promoting the healing process and having a low compressive strength to facilitate removal.
What is the ideal thickness of a luting agent film for it to be effective?
1) 50 µm
2) 25 µm
3) 10 µm
4) 5 µm
An effective luting agent must be able to flow into a continuous film of 25 µm thickness or less without fragmentation.
What is the chemical structure of Giomers?
1) They contain fluoraluminosilicate glass and silica-filled urethane resin.
2) They are purely organic ceramic-filled polymers.
3) They are a combination of glass ionomer and resin-modified glass ionomer.
4) They have a matrix of polyacrylic acid and ceramic filler particles.
Giomers are a combination of fluoraluminosilicate glass and silica-filled urethane resin. This unique composition allows for the release of fluoride and improved physical properties compared to traditional composites.
What is the minimum 24-hour compressive strength required for dental cement according to ANSI/ADA Specification No. 96 (ISO 9917)?
1) 50 MPa
2) 70 MPa
3) 100 MPa
4) 150 MPa
The text states that the standard luting consistency of dental cement must exhibit a minimum 24-hour compressive strength of 70 MPa.
What is the typical range of pH for almost neutral cements?
1) pH 4-7
2) pH 7-10
3) pH > 10
4) pH 4-10
Almost neutral cements have a pH range of 7-10, with zinc oxide-eugenol being an example.
What is the primary concern with using zinc oxide-eugenol cement in large restorations?
1) Low compressive strength
2) Potential for pulpal toxicity
3) High thermal conductivity
4) High solubility
The primary concern is the potential for pulpal toxicity due to the diffusion of eugenol.
What is the function of benzoyl peroxide in the composition of denture base resin powder?
1) It acts as a filler
2) It acts as a cross-linking agent
3) It acts as an initiator
4) It acts as an inhibitor
Benzoyl peroxide in the powder of denture base resin is responsible for initiating the polymerization process when it reacts with the monomer in the liquid component.