274+ quick-fire dental facts • tap a card to flip
Compomers are indeed known as Polyacrylic acid Modified Composite Resins (PMCRs). They are characterized by their ease of placement, minimal shrinkage, and ability to be shaped and polished after curing. These properties make them a popular choice for dentists due to their user-friendliness and good handling characteristics.
What are Compomers also known as, and what are their key characteristics?
1) Compomers are also known as Polyacrylic acid Modified Composite Resins (PMCRs), which are soft, non-sticky, and do not require mixing. They are known for their user-friendly nature and are a blend of Glass ionomers and Composite resins.
2) Compomers are also known as Glass-ionomer reinforced composites, which are hard, require mixing, and are difficult to place.
3) Compomers are a type of metal-reinforced composite that is used for inlays and onlays.
4) Compomers are a combination of Amalgam and Composite materials that provide high strength and aesthetics.
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 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
Resin cements are generally applied in a film thickness of 25 µm or less for optimal performance.
What is the typical film thickness for a resin cement?
1) 50 µm
2) 25 µm
3) 15 µm
4) 5 µm
With high-density noble metal alloy 6 grams is adequate for premolar and anterior castings, 9 grams is adequate for molar casting and 12 grams is adequate for pontics.
How many grams of high-density noble metal alloy is required for casting of a molar?
1) 3 gms
2) 6 gms
3) 9 gms
4) 12 gms
Resin cements are commonly used for cementing metal crowns and bridges due to their high bond strength and durability.
What type of cement is most commonly used for cementing metal crowns and bridges?
1) Zinc oxide-eugenol
2) Zinc phosphate
3) Glass ionomer
4) Resin cement
Epoxy resins
· Abrasion resistance is many times greater than gypsum
· More expensive
· Undergoes 0.1 – 0.2% shrinkage, thus their shrinkage is approximately equal to gypsum. This is less of problem with newer formulations & polyurethane resin.
· Their detail reproduction is better.
· Hydrocolloids, polysulfides are not compatible with them.
Epoxy resins are compatible with which of the following impression material :
1) Polysulphide impression material
2) Polyether impression material
3) Agar
4) Alginate
Luting agents are used to create a tight seal between the crown and the tooth and to enhance the retention of the restoration.
What are the two primary purposes of using a luting agent in the placement of a single crown?
1) To achieve a tight seal and to enhance esthetics
2) To provide insulation against thermal changes and to reduce sensitivity
3) To bond the crown to the tooth and to protect the pulp
4) To disinfect the tooth and to provide a base for the crown
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