"Mock" Written EFDA Board

Why is a thin layer of calcium hydroxide considered therapeutic when placed in a deep prep? - Answer- Stimulates a thickening of dentin At which line angles are the retention grooves in a class II amalgam located? - Answer- Linguoaxial and buccoaxial What is dentin primarily composed of? - Answer- Dentinal tubules with protoplasmic extensions What is enamel composed of? - Answer- 95% organic matter At which portion of the tooth is enamel thicker? - Answer- Incisal/occlusal Which is darker in color, enamel or dentin? - Answer- Dentin ZOE placed in a deep DO amalgam to replace axial and pulpal walls should have what type of base shape? - Answer- Rounded/beveled axis-pulpal line angle Which material is NOT compatible with composite? - Answer- Zinc oxide eugenol cement A lingual pit on tooth #7 is what type of restoration? - Answer- Class I Where would you place a base? - Answer- On dentin surfaces Which metal adds strength and decreases expansion of amalgam? - Answer- Copper What is the order of placement in a very deep prep for amalgam that has a near-pupal exposure and loss of axial wall contour? - Answer- Calcium hydroxide, cavity varnish, zinc phosphate cement What component results in decreased expansion of amalgam? - Answer- High copper content What is galvanization? - Answer- Occurs when dissimilar metals touch inside the mouth and produce an electric current that causes pain Which material has poly acrylic acid as a component of its liquid? - Answer- Glass ionomer cement Why are bonding agents used before composite? - Answer- To provide a bond to both the dentin and composite