Dental Materials NBDHE Dental Materials NBDHE from Dental Hygiene Seminars Board Review 2020 textbook Questions and Answers
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Course
Dental Materials NBDHE
Institution
Dental Materials NBDHE
Adhesion
Ans- the chemical attraction between *unlike* molecules
Cohesion
Ans- the chemical attraction between *like* molecules
Coefficient of thermal expansion
Ans- An index which indicates how one material reacts to temperature
extremes in relation to another
Compressive strength
Ans- th...
Dental Materials NBDHE
Dental Materials NBDHE
from Dental Hygiene
Seminars Board Review
2020 textbook Questions
and Answers
Adhesion
Ans- the chemical attraction between *unlike* molecules
Cohesion
Ans- the chemical attraction between *like* molecules
Coefficient of thermal expansion
,Ans- An index which indicates how one material reacts to temperature
extremes in relation to another
Compressive strength
Ans- the force at which a material breaks under pressure
Creep
Ans- slow dimensional change caused by compression
Ductility
Ans- the ability to undergo change of form without breaking
Elasticity
Ans- a material's ability to recover its initial shape after undergoing a force
Galvanism
,Ans- An electrical current generated by dissimilar metals in an acidic
environment
Gelation
Ans- The process of gelling (solidification by cold)
Imbibition
Ans- Absorption of a solvent by a gel
Malleability
Ans- A material's capacity to be shaped by force or pressure
Microleakage (percolation)
Ans- passage of oral fluids/bacteria into and out of tooth structure due to a
marginal gap or failure of the marginal (restorative) seal
Polymerization
, Ans- the linking, branching, or cross-linking of smaller molecules to generate a
larger molecule, as seen with composite bonding and impression setting
Proportional limit
Ans- the force at which a material cannot return to its original shape
Syneresis
Ans- Contraction of a gel due to the loss of a solvent
Tensile strength
Ans- The force needed to stretch a material to the point of fracture
Viscosity
Ans- resistance to flow (the higher it is, the lower the flow)
*mouthwash has lower than toothpaste
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