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22 Cards in this Set
- Front
- Back
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1State three goals of photocuring a restorative material
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1. bonding layer is uniformly polymerized; 2. similar extent of curing on surface and bottom; 3. reasonable amnt of time
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2State three components of a photocurable material, and indicate the basic mechanism involved.
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1. polymerizable resin mixture; 2. photoactive agents; 3. energy delivery to restorative material; mech- methacyrlate to C-C single bond with free radical
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3State six factors related to the curing light that affect curing effectiveness.
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1. Output frequency (wavelength); 2. Output value (irradiance); 3. Exposure duration; 4. Output energy; 5. Proximity of tip; 6. Cleanliness of tip
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4State two factors affecting composite cure and define “depth of cure.”
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low-fill resin, resin composites; depth of cure in 2mm thick increments
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5Define the term “radiant energy” and indicate how it differs from ”irradiance.”
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Radiant energy is just the energy of electromagnetic waves. Irradiance is energy density, or the POWER of electromagnetic radiation PER AREA, incident on the surface.
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6State five clinical technique aspects for optimizing the results of chair-side photo-curing, and discuss aspects of each.
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PASEO - Protection, Alignment, Stabilization, Exposure duration, Observation
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7State the potential of a light-curing unit to act as a “fomite;” an inanimate object capable of disease transmission
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bioload on the tips
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8State if clear curing light tip barriers significantly affect either energy transmission from a curing light, or its ability to produce effective composite curing.
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not signficant decrease in cure % monomer conversion
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9State the potential harm of blue light exposure, and what methods should be taken to avoid it.
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irreversible retinal burning
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t/f after about a year, all of the resin will have cured
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always have some amount that remains uncured...so we want to maximally polymerize
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3 characteristics of light when curing
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frequency, intensity, duration
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equation for output value; measurement?
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intensity/unit area...mW/cm^2 ...IRRADIANCE
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Energy equation detail
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irradiance*exposure; (mW/cm^2)*s
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Energy equation simple
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E = Power * Time
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energy density formula
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(power/AREA) * time aka irradiance
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power density is the same as
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irradiance
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define power
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rate at which work is done (work/s)
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define energy
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total POWER used over given time (power*s)
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Clinical Technique PASEO mnemonic stands for
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Protection, Alignment, Stabilization, Exposure duration, Observation
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what does MARC stand for
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Managing Accurate Resin Curing
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t/f watch what you are doing ALL throughout the exposure
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TRUE
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best tip end barrier
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single layer of saran wrap
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