EFDA study guide UPDATED ACTUAL
Exam Questions and CORRECT Answers
Undertrituration - CORRECT ANSWER - Products of a drier mix that lacks mercury
cohesiveness to mass when it is placed
High % of mercury - CORRECT ANSWER - Amalgam is easier to mix and sets slower
% of copper - CORRECT ANSWER - Low <5% high 13-30% copper to alloy
Copper reduction - CORRECT ANSWER - Increasing the copper in alloy reduces
problems with creep and gamma 2 phase
Creep - CORRECT ANSWER - Slow movement of material under compressive forces
over a period of time
Corrosion resistance - CORRECT ANSWER - Copper adds strength and decrease
expansion of amalgam
Tin - CORRECT ANSWER - A combination of mercury and alloy known for its
workability
Silver - CORRECT ANSWER - Main component of amalgam and gives it its strength
Bevel - CORRECT ANSWER - Removes the outer layer of fluoride rich enamel rods
Modified type - CORRECT ANSWER - Does not extend into the Dentin, class V and III,
use diamond bits bevel at 45 degrees, small surface defects
,Composite prep - CORRECT ANSWER - Minimum pulp irritation, conservative,
mechanical bond between resin, etched and enamel, marginal integrity, reduced microleakage
Sandwich Technique - CORRECT ANSWER - Restoration-Glass Ionomer-Tooth
Resin Modified Glass Ionomer (RMGI) - CORRECT ANSWER - Acts like composite
mixture of glass ionomer organic acid, and resin. No adhesive needed holds better than GI, used
on the class I, II, III, V and baby teeth, pit and fissures, geriatric, root caries and core build ups.
Cannot be used on occlusal surfaces on adults
Compomers - CORRECT ANSWER - Have GI properties, more like composites than GI,
requires adhesive, used in class I, II, and V, pit and fissures, ortho band cements, and baby teeth
Nano fils - CORRECT ANSWER - Similar micro hybrids, cluster of .01-.002 microns,
enamel like finishing
MicroHybrids - CORRECT ANSWER - 40-60% inorganic particles, esthetics is superb,
light opacities similar to natural teeth
Hybrid resins - CORRECT ANSWER - 70-80% particles, submicron particles, finish and
polishes great, good physical properties
Microfilled resins - CORRECT ANSWER - 40-60% particles, polishable, improved rough
surfaces, no large particles, subsceptible to recurrent carries, less filler by weight, physical
characteristics inferior, subsceptible to shear fractures, increased coefficient thermal expansion,
radiolucent, and displays greater wear resistance to toothbrush abrasion
Air inhibited layer - CORRECT ANSWER - Air exposed tooth will not polymerize
Copal varnish - CORRECT ANSWER - Defeats the bonding process and cannot be used
with composite, used to close the tubelous. Placed after any material that will help the dentin. Ex.
Calcium hydroxide and ZOE. Use 2 applications
, Exothermic - CORRECT ANSWER - When Zinc phosphate heats up
Large filler particles - CORRECT ANSWER - Are not polishable
Hybrid layer - CORRECT ANSWER - Strong bond between agent and composite
Etchant - CORRECT ANSWER - Opens the tooth and allows bonding agent to
mechanically interlock into enamel
Silane coupling - CORRECT ANSWER - Increases strength of composite resins and
reduces solubility and water absorption
BIS-GMA resin matrix - CORRECT ANSWER - Bisphenol A Glycidlmeth Acrylate
interferes with the endocrine estrogen chemical
Filled composite resin - CORRECT ANSWER - Created in the 1960's is the most popular
and has replaced silicate
Unfilled acrylic resins disadvantages - CORRECT ANSWER - Poor coefficient, thermal
expansion, abrasion resistance is poor, monomer material affects the pulp
Unfilled acrylic resins advantages - CORRECT ANSWER - Easy to place, smooth, and
resist fractures are a form of organic plastic restorative material used for denture bases and teeth
Acrylic resins unfilled - CORRECT ANSWER - Created in 1945-1960's used for denture
bases and teeth
Silicate cement - CORRECT ANSWER - Created In The 1960-1970's, releases fluoride
and is soluble
Exam Questions and CORRECT Answers
Undertrituration - CORRECT ANSWER - Products of a drier mix that lacks mercury
cohesiveness to mass when it is placed
High % of mercury - CORRECT ANSWER - Amalgam is easier to mix and sets slower
% of copper - CORRECT ANSWER - Low <5% high 13-30% copper to alloy
Copper reduction - CORRECT ANSWER - Increasing the copper in alloy reduces
problems with creep and gamma 2 phase
Creep - CORRECT ANSWER - Slow movement of material under compressive forces
over a period of time
Corrosion resistance - CORRECT ANSWER - Copper adds strength and decrease
expansion of amalgam
Tin - CORRECT ANSWER - A combination of mercury and alloy known for its
workability
Silver - CORRECT ANSWER - Main component of amalgam and gives it its strength
Bevel - CORRECT ANSWER - Removes the outer layer of fluoride rich enamel rods
Modified type - CORRECT ANSWER - Does not extend into the Dentin, class V and III,
use diamond bits bevel at 45 degrees, small surface defects
,Composite prep - CORRECT ANSWER - Minimum pulp irritation, conservative,
mechanical bond between resin, etched and enamel, marginal integrity, reduced microleakage
Sandwich Technique - CORRECT ANSWER - Restoration-Glass Ionomer-Tooth
Resin Modified Glass Ionomer (RMGI) - CORRECT ANSWER - Acts like composite
mixture of glass ionomer organic acid, and resin. No adhesive needed holds better than GI, used
on the class I, II, III, V and baby teeth, pit and fissures, geriatric, root caries and core build ups.
Cannot be used on occlusal surfaces on adults
Compomers - CORRECT ANSWER - Have GI properties, more like composites than GI,
requires adhesive, used in class I, II, and V, pit and fissures, ortho band cements, and baby teeth
Nano fils - CORRECT ANSWER - Similar micro hybrids, cluster of .01-.002 microns,
enamel like finishing
MicroHybrids - CORRECT ANSWER - 40-60% inorganic particles, esthetics is superb,
light opacities similar to natural teeth
Hybrid resins - CORRECT ANSWER - 70-80% particles, submicron particles, finish and
polishes great, good physical properties
Microfilled resins - CORRECT ANSWER - 40-60% particles, polishable, improved rough
surfaces, no large particles, subsceptible to recurrent carries, less filler by weight, physical
characteristics inferior, subsceptible to shear fractures, increased coefficient thermal expansion,
radiolucent, and displays greater wear resistance to toothbrush abrasion
Air inhibited layer - CORRECT ANSWER - Air exposed tooth will not polymerize
Copal varnish - CORRECT ANSWER - Defeats the bonding process and cannot be used
with composite, used to close the tubelous. Placed after any material that will help the dentin. Ex.
Calcium hydroxide and ZOE. Use 2 applications
, Exothermic - CORRECT ANSWER - When Zinc phosphate heats up
Large filler particles - CORRECT ANSWER - Are not polishable
Hybrid layer - CORRECT ANSWER - Strong bond between agent and composite
Etchant - CORRECT ANSWER - Opens the tooth and allows bonding agent to
mechanically interlock into enamel
Silane coupling - CORRECT ANSWER - Increases strength of composite resins and
reduces solubility and water absorption
BIS-GMA resin matrix - CORRECT ANSWER - Bisphenol A Glycidlmeth Acrylate
interferes with the endocrine estrogen chemical
Filled composite resin - CORRECT ANSWER - Created in the 1960's is the most popular
and has replaced silicate
Unfilled acrylic resins disadvantages - CORRECT ANSWER - Poor coefficient, thermal
expansion, abrasion resistance is poor, monomer material affects the pulp
Unfilled acrylic resins advantages - CORRECT ANSWER - Easy to place, smooth, and
resist fractures are a form of organic plastic restorative material used for denture bases and teeth
Acrylic resins unfilled - CORRECT ANSWER - Created in 1945-1960's used for denture
bases and teeth
Silicate cement - CORRECT ANSWER - Created In The 1960-1970's, releases fluoride
and is soluble
