Quiz 3 Flashcards
What are composite resins mainly composed of?
Composite resins are composed mainly of an organic resin matrix and inorganic silica filler particles joined together by a silane coupling agent.
Where is fluoride’s greatest anticaries benefit gained?
Fluoride’s greatest anticaries benefit is gained from topical fluoride exposure after the teeth have erupted.
Fluoride in the saliva surrounding the tooth is incorporated into the surface of enamel crystals during remineralization.
What is used to prepare the dentinal tooth surface for glass ionomer cement?
10% polyacrylic acid is applied for 10 seconds to the cavity preparation.
Which cause of tooth sensitivity may be treated with a desensitizing agent?
Exposed dentinal tubules due to loss of enamel and dentin from dietary acids.
What is the recommended maximum thickness for light-cured composite increments?
It is recommended that light-cured composite be placed in increments no thicker than 2.0 mm.
What are the fillers used in composite resins?
The fillers used in composite resins are inorganic silica particles.
Which of the following is not an indication for pit and fissure sealants?
Coalesced grooves.
What is an advantage of composite resin versus amalgam?
Composite resins have similar thermal conductivity as tooth structure.
Which type of curing light is currently the most popular?
Light-emitting diode (LED) lights are the most popular curing light units.
What is the particle size range for nanohybrids?
Nanohybrids have a particle size of 0.005 to 0.020 microns (µm).
What will occur if carious teeth are treated with sealants?
Treatment of carious teeth with sealants resulted in an 89% reversal from a caries-active to a caries-inactive state.
What should be used to reduce sticking of composite material to the placement instrument?
It is recommended to use a specially coated instrument.
What is correct regarding nanohybrid composite resins?
The shrinkage has been reduced from roughly 3% with earlier composites to less than 1% with some of the nanohybrids.
How should composite resins be placed into a preparation to avoid shrinkage?
Composite resins should be placed in small increments.
What is the term for the heat given off when composite resins are cured?
This is called an exothermic reaction.
What is a direct-placement esthetic material?
Composite resin is a direct-placement esthetic material.
What is correct regarding polymerization shrinkage of composite resin restorations?
Recent research indicates that the composite resin material does not shrink toward the light.
From which teeth are sealants most frequently lost?
Sealants are most frequently lost from second molars.
What is the accepted optimal level of fluoride in drinking water?
The accepted optimal level of fluoride in the drinking water is in the range of 0.7 to 1.2 mg/L.
How does filler content affect the coefficient of thermal expansion (CTE) in composite restorative materials?
The greater the filler content, the lower the CTE, and the greater the resin content, the greater the CTE.
