HOSMERIT
DENTAL HYGIENE NATIONAL BOARD EXAM WITH
COMPLETE SOLUTIONS LATEST UPDATE
What is the difference between adhesion and cohesion? - ANSWER adhesion is thechemical
attraction between UNLIKE molecules while cohesion is the attraction between LIKE molecules
What is an index which indicates how one material reacts to temperature extremes inrelation to
another? - ANSWER Coefficient of thermal expansion
What is a SLOW dimensional change caused by compression? - ANSWER Creep
What is the ability to undergo change of form without breaking? - ANSWER Ductility
What is an electrical current generated by dissimilar metals in an acidic environment? -ANSWER
Galvanism
What is a typical example of galvanism? - ANSWER A newly places silver amalgamrestoration
adjacent to a cast gold crown
What is gelation? - ANSWER The process of gelling, or solidification by cold
What is the volume of one cubic centimeter or milliliter of water? - ANSWER Gram
What is the absorption of solvent by a gel? - ANSWER Imbibition
What is the material's ability to be shaped by force or pressure? - ANSWER malleability
What is one example of malleability? - ANSWER modeling clay or play dough
, What is the passage of oral fluids/bacteria into and out of tooth structure due to marginal gap or
failure of marginal (restorative) seal? - ANSWER Micro-leakage(percolation)
What is the linking, branching, or cross-linking of smaller molecules? - ANSWERpolymerization
What is the force at which a material cannot return to its original shape? - ANSWERproportional
limit
What is the contraction of a gel on account of loss of solvent? - ANSWER syneresis
What force is required to stretching a material to the point of fracture? - ANSWERTensile
Strength
What is the resistance to flow? - ANSWER Viscosity
What does truism mean? - ANSWER If you change a material's components, you changeits
properties
What dental material is an alloy of mercury? - ANSWER Amalgam
What are some desirable features of Amalgam? - ANSWER Durable, similar compressivestrength
to enamel, and relatively inexpensive
What are some undesirable features of Amalgam? - ANSWER Unattractive, high thermal
conductivity, dimensionally unstable, delayed expansion if contaminated by saliva, requires tooth
support
What would be the final polish to use on an amalgam? - ANSWER tin oxide
Why is polishing a benefit to an amalgam? ANSWER polishing can reduce the rate ofcorrosion
(less surface area)
DENTAL HYGIENE NATIONAL BOARD EXAM WITH
COMPLETE SOLUTIONS LATEST UPDATE
What is the difference between adhesion and cohesion? - ANSWER adhesion is thechemical
attraction between UNLIKE molecules while cohesion is the attraction between LIKE molecules
What is an index which indicates how one material reacts to temperature extremes inrelation to
another? - ANSWER Coefficient of thermal expansion
What is a SLOW dimensional change caused by compression? - ANSWER Creep
What is the ability to undergo change of form without breaking? - ANSWER Ductility
What is an electrical current generated by dissimilar metals in an acidic environment? -ANSWER
Galvanism
What is a typical example of galvanism? - ANSWER A newly places silver amalgamrestoration
adjacent to a cast gold crown
What is gelation? - ANSWER The process of gelling, or solidification by cold
What is the volume of one cubic centimeter or milliliter of water? - ANSWER Gram
What is the absorption of solvent by a gel? - ANSWER Imbibition
What is the material's ability to be shaped by force or pressure? - ANSWER malleability
What is one example of malleability? - ANSWER modeling clay or play dough
, What is the passage of oral fluids/bacteria into and out of tooth structure due to marginal gap or
failure of marginal (restorative) seal? - ANSWER Micro-leakage(percolation)
What is the linking, branching, or cross-linking of smaller molecules? - ANSWERpolymerization
What is the force at which a material cannot return to its original shape? - ANSWERproportional
limit
What is the contraction of a gel on account of loss of solvent? - ANSWER syneresis
What force is required to stretching a material to the point of fracture? - ANSWERTensile
Strength
What is the resistance to flow? - ANSWER Viscosity
What does truism mean? - ANSWER If you change a material's components, you changeits
properties
What dental material is an alloy of mercury? - ANSWER Amalgam
What are some desirable features of Amalgam? - ANSWER Durable, similar compressivestrength
to enamel, and relatively inexpensive
What are some undesirable features of Amalgam? - ANSWER Unattractive, high thermal
conductivity, dimensionally unstable, delayed expansion if contaminated by saliva, requires tooth
support
What would be the final polish to use on an amalgam? - ANSWER tin oxide
Why is polishing a benefit to an amalgam? ANSWER polishing can reduce the rate ofcorrosion
(less surface area)
