Dental Composites: A Comprehensive Review

~ Exam ~

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1. Composites are composed of fillers and matrix.

  a. True

  b. False


2. The most common composite is made of an acrylic matrix called:

  a. Glass ionomer.

  b. Resin modified glass ionomer.

  c. BIS-GMA

  d. Silane


3. The first form of bonding used in dentistry was:

  a. Dentinal bonding.

  b. Phosphoric acid conditioning

  c. Acid-etch enamel conditioning.

  d. All of the above.


4. Glass ionomer and polycarboxylate cements may be applied directly to unconditioned enamel and dentin without conditioning or primer application.

  a. True

  b. False


5. Mechanical retention remains the most commonly used method to retain crowns and large fillings onto teeth. This is done by:

  a. Acid-etch enamel conditioning.

  b. Undercuts inside the cavity.

  c. Phosphoric acid conditioning.

  d. None of the above.


6. All dental cements and tooth-colored filling materials are made of combinations of only two different powders and four different liquids.

  a. True

  b. False


7. Stabilizers make glass strong and water resistant. One type of stabilizer is called:

  a. Eugenol.

  b. Phosphoric acid.

  c. Calcium carbonate.

  d. Polyacrylic acid.


8. Glass particles in silicate cements are prone to dislodge from filling surfaces.

  a. True

  b. False


9. Alumino-fluoro-silicate glass is stabilized with:

  a. Alumina.

  b. Boron oxide.

  c. Eugenol.

  d. ZOE.


10. Margins and surfaces made with glass ionomers are less prone to chipping and crazing than materials used in other restorations.

  a. True

  b. False


11. Glass ionomer bases are less likely to debond from the pulpal floor during service than conventional composites. This is because:

  a. Micro sized particles are advantageous compared to macro sized particles.

  b. Thermal expansion of glass ionomer cements is close to that of dentin and Thermal expansion of glass ionomer cements is close to that of dentin and enamel.

  c. They are made with resin.

  d. None of the above.


12. Glass ionomers are very sensitive to water contamination during placement.

  a. True

  b. False


13. An example of zinc oxide powder is:

  a. Glass ionomer cement.

  b. Resin composite cement.

  c. Silicate cement.

  d. ZOE.


14. Zirconium and titanium oxides add color to glass.

  a. True

  b. False


15. Trace metals add opacity to glass.

  a. True

  b. False


16. Acrylic resin has two characteristics which make it unsuitable as a restorative material if used by itself without glass filler particles.

  a. Gaps between the restoration and tooth.

  b. Difficulty of use.

  c. Premature wear.

  d. A and C.


17. Two resins most commonly used to formulate dental composite matrixes are BisGma and urethane dimethacrylate.

  a. True

  b. False


18. Fluxes are used to:

  a. Lower the melting temperature of quartz.

  b. Prevent crazing.

  c. Dissolve silica.

  d. A and C.


19. Large glass particles in cements:

  a. Make cements easier to work with.

  b. Reduce shrinkage in the filling while setting.

  c. Are not polishable.

  d. All of the above.


20. Hybrid composites can be filled more densely with glass particles than composites containing only micro sized particles.

  a. True

  b. False


21. Increased surface area of micro particles increases internal friction.

  a. True

  b. False


22. The depty of cure depends on several factors:

  a. The opacity of filler particles.

  b. The density of filler particles.

  c. The shade of the composite, darker shades having less depth of cure than lighter shades.

  d. All of the above.


23. Compomers have two main constituents. They are:

  a. A resin modified with dimethacrylate monomers with two carboxylic groups present in their structure and a filler that is similar to alumino-fluoro-silicate present in glass ionomer cements.

  b. A thermal expansion of 9 ppm/°C and glass ionomers.

  c. A and B.

  d. None of the above.


24. It is desirable for composites and cements to have similar thermal expansion coefficients as does enamel.

  a. True

  b. False


25. Restorative composites, porcelain, or various dental cements are not inherently radiopaque.

  a. True

  b. False