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EFDA, I Composite (Ch 9) Questions and Answers 2024
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EFDA, I Composite (Ch 9)
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EFDA, I Composite (Ch 9)1. replace lost tooth structure
2. restore the form and function of the tooth
3. provide a closely matched color of natural tooth
4. mask discolored or mottled teeth
5. reshape teeth - answer Esthetic restorative materials are used to:
1. Porcelain
2. Silicate Cements
3. Unfilled Acrylic Resin - answer Before composites were available for use, what other
choices in dental materials did the dentist have?
Porcelain - answer first tooth colored dental restorative material, expensive, showed a
cement line (molded into the cavity prep, baked in oven, cemented into prep)
Silicate Cements - answer esthetic by old standards, powder contained silicate
aluminum glass that released fluoride, liquid contained phosphoric acid, relatively
opaque, rough, poor resistance to compressive force, soluble
Unfilled Acrylic Resin - answerorganic plastic material similar to denture bases and
teeth, formed by a reaction of polymer and monomer, easy to place/smooth, esthetic,
resists fractures, expands and contracts, wears away easily, poor color stability,
monomer can affect the pulp
easy to place and smooth - answerName one advantage to unfilled acrylic resin.
wears away easily - answerName one disadvantage to unfilled acrylic resin.
Composite - answeraka filled resin, most popular tooth colored material since 1960,
matrix is made of bisphenol a and glycidyl methacrylate (BIS GMA)
Organic, Inorganic Fillers - answerComposite resins are an _______ resin matrix that
contains ________ _______
1. Quartz or Silica
2. Lithium Aluminum Silicate
3. Barium Glasses
4. Nanofill - answerWhat materials can the inorganic fillers be made out of?
Composite Resin - answerResin Matrix (BIS-GMA) + Inorganic Fillers=
, Because of the mechanical retention between the tooth and bonding agent and the
chemical retention between the bonding agent and composite - answerWhy does
composite resin materials have a better marginal seal?
1. Mechanical Retention
2. Chemical Retention - answerWhat are the two types of retention that composite resin
restorations can have
Mechanical Retention - answerbetween the tooth and the bonding agent, enamel is
etched, flowable is flowed into micro pores and forms resin tags that interlock the resin
to the etched enamel
Chemical Retention - answerbetween the bonding agent and composite, less flowable
composite resin is placed over the unfilled bonding agent, chemically bonds to unfilled
resin, result is a strong bond between tooth and composite
32-40% - answerWhat percent of phosphoric acid is there in etchant?
1. Larger filler particles are not as polishable
2. Eugenol can inhibit reaction of composite
3. Varnish should never be used because it slows the bonding process
4. Air inhibits polymerization (wet film) - answerWhat are the disadvantages of
composite restorative material?
1. Macrofill (conventional or traditional)
2. Microfill
3. Hybrid
4. Microhybrid
5. Nanofill - answerWhat are the different types of composites?
Macrofill Composite - answeraka conventional or traditional,larger particles, rough
surface texture due to hardness and size of particles, used in posterior
Microfill Composite - answerpolishable, surface closely resembles tooth surface, small
particles, less susceptible to recurrent caries plaque buildup and extrinsic stain, may be
more susceptible to fractures but more resistance to tooth brush abrasion, radiolucent
and uncommon in posterior
Hybrid Composite - answercontains submicron particles mixed with larger particles,
smooth surface, combines good physical properties of conventional with smooth surface
of microfilled
Microhybrid Composite - answermix of particle sizes and become the most popular,
combine properties of microfill with hybrids to create more polishable and strong filling,
great esthetics, different opacities to simulate the color vitality of natural teeth
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