Dental Polymerization Processes Quiz

<p>Lower molecular weight monomers cause more shrinkage. (A)</p> Signup and view all the answers

<p>Greater DC results in higher shrinkage. (B)</p> Signup and view all the answers

<p>The variability of conversion from top to bottom of a layer. (B)</p> Signup and view all the answers

<p>Concentration of monomers, sensitizers, and accelerators. (D)</p> Signup and view all the answers

<p>Volume shrinkage of 2-4% occurs. (B)</p> Signup and view all the answers

<p>Polymerization (A)</p> Signup and view all the answers

<p>Photopolymerization (C)</p> Signup and view all the answers

<p>Cross-linked chains (D)</p> Signup and view all the answers

<p>Color of the resin (D)</p> Signup and view all the answers

<p>To transform resins into tough, hard structures (D)</p> Signup and view all the answers

<p>Development of solid structures (D)</p> Signup and view all the answers

<p>Light source (B)</p> Signup and view all the answers

<p>Packed cross-linked chains (A)</p> Signup and view all the answers

<p>Not specified (D)</p> Signup and view all the answers

<p>16 J/cm2 (C)</p> Signup and view all the answers

<p>Blue-light filters (orange blue-blockers) (A)</p> Signup and view all the answers

<p>40 seconds (B)</p> Signup and view all the answers

<p>400 to 800 mW/cm2 (C)</p> Signup and view all the answers

<p>Camphorquinone (B)</p> Signup and view all the answers

<p>Pulpal irritation (D)</p> Signup and view all the answers

<p>To ensure effective polymerization of resins (B)</p> Signup and view all the answers

<p>QTH units have a wider wavelength range of 390 to 490 nm compared to LED units, which range from 430 to 470 nm. (B)</p> Signup and view all the answers

<p>Camphorquinone (A)</p> Signup and view all the answers

<p>Joules (C)</p> Signup and view all the answers

<p>430 to 470 nm (D)</p> Signup and view all the answers

<p>QTH units have a significantly broader wavelength emission range than LED units. (D)</p> Signup and view all the answers

<p>2.0 mm (C)</p> Signup and view all the answers

<p>Blue-light blockers (A)</p> Signup and view all the answers

<p>1200 mW/cm2 (D)</p> Signup and view all the answers

<p>Harm to pulp tissue (A)</p> Signup and view all the answers

<p>LED units produce less heat overall (B)</p> Signup and view all the answers

<p>Ambient temperature (B)</p> Signup and view all the answers

<p>LEDs (B)</p> Signup and view all the answers

<p>Taste perception (C)</p> Signup and view all the answers

<p>Tungsten filament (C)</p> Signup and view all the answers

<p>Through electron recombination in a semiconductor (C)</p> Signup and view all the answers

<p>Photons generated (A)</p> Signup and view all the answers

<p>Water sorption (D)</p> Signup and view all the answers

<p>Higher power consumption (B)</p> Signup and view all the answers

A chemical reaction where small molecules called monomers link together to form long chains called polymers.

A specific type of polymerization that uses light energy to initiate the reaction. This light energy is typically provided by a blue light curing unit.

The ability of a material to resist deformation under stress. This property is crucial for dental resins to withstand chewing forces.

A measure of how much a material can withstand before breaking. It's important that dental resins can withstand the forces of biting.

The ability of a material to resist scratching. This property is essential for dental resins because they're exposed to food and other substances in the mouth.

The ability of a material to return to its original shape after being deformed. This property is important for dental resins to withstand the constant pressure and forces of chewing.

The tendency of a material to absorb water. This can affect the strength and durability of dental resins, causing them to weaken or break down over time.

A device that uses blue light to activate the chemical reaction of photopolymerization. This allows the dental resin to harden and become a solid structure.

The first step of polymerization, where free radicals initiate the reaction chain.

The growth phase of the polymerization, where free radicals react with monomers, extending the polymer chain.

The termination of the polymerization, where free radicals combine, ending the growth of the polymer chain.

The reduction in volume that occurs during polymerization, as monomers pack closer together.

The percentage of double bonds that are converted into single bonds during polymerization.

The variation in the amount of polymerization occurring at different depths from the light source.

The extent to which light can pass through a material. It's important for light-cured resins, as they rely on light to harden.

The wavelength of light emitted by a light-curing unit determines how much light can be absorbed by the resin. Different wavelengths interact differently with materials.

The amount of light energy absorbed by a resin will affect how quickly and thoroughly it hardens.

The presence of inorganic fillers in a resin affects its light transmission properties. Higher filler content can make the resin more opaque and less transparent to light.

The degree of conversion is a measure of how well the monomers in a resin have linked together to form a solid structure.

The ability of a material to withstand forces without breaking. This is crucial for dental resins, as they need to hold up to biting forces.

The ability of a material to resist changes in color over time due to factors like exposure to light or food.

A type of light-curing unit that emits light in a wider spectral range, typically from 390 to 490 nanometers. It utilizes a quartz-tungsten halogen (QTH) bulb as its light source.

A type of light-curing unit that emits light in a narrower spectral range, typically from 430 to 470 nanometers. It utilizes light-emitting diodes (LEDs) as its light source.

The specific wavelength of light that is most effective at activating a photoinitiator. For camphorquinone, the peak wavelength is around 430 to 470 nm.

A chemical compound used in dental resins that absorbs light energy and initiates the polymerization process. It is a crucial component in light-activated composite resins.

A graph showing the intensity of light emitted by a light-curing unit at different wavelengths. It helps visualize the spectral output of the unit.

The amount of light energy emitted by a curing light, measured in milliwatts per square centimeter (mW/cm²).

The maximum depth that a curing light can effectively polymerize a dental material.

The amount of heat generated by a curing light, which can potentially damage the pulp tissue of a tooth.

A type of curing light that emits blue light to activate the polymerization of dental materials.

A device that absorbs blue light, reducing the risk of damage to the pulp tissue from curing lights.

The wavelength of light that is most effectively absorbed by a photoinitiator, initiating the polymerization process.

The wavelength of light emitted most intensely by a curing unit, designed to match the photoinitiator's peak absorption wavelength for efficient polymerization.

A type of curing unit that emits a broad spectrum of light, including wavelengths that are not as effective for polymerization.

A type of curing unit that emits mainly blue light, which is highly effective for polymerization of resins with camphorquinone photoinitiators.

The total amount of light energy delivered to a material, measured in joules per square centimeter (J/cm²).

Avoiding direct exposure to the curing light, especially its blue light, to minimize potential eye damage.