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Dental Materials NBDHE exam with complete solution 2024_2025
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Adhesion The chemical attraction between unlike molecules Cohesion The chemical attraction between like molecules Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:01 / 0:15 Full screen Brainpower Read More Coefficient of thermal expansion An index...

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  • September 10, 2024
  • 10
  • 2024/2025
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  • dental materials nbdhe exam with complete solution

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Dental Materials NBDHE exam with
complete solution 2024/2025



Adhesion - ANSWER- The chemical attraction between unlike molecules

Cohesion - ANSWER- The chemical attraction between like molecules

Coefficient of thermal expansion - ANSWER- An index which indicated how one
material reacts to temperature extremes in relation to another

Compressive Strength - ANSWER- The force at which a material breaks under
pressure

Creep - ANSWER- Slow dimensional change caused by compression

Ductility - ANSWER- The ability to undergo change of form without breaking

Elasticity - ANSWER- Material's ability to recover its initial shape after undergoing
a force

Galvanism - ANSWER- An electrical current generated by dissimilar metals in an
acidic environment

Gelation - ANSWER- The process of gelling (solidification by cold)

Imbibition - ANSWER- Absorption of a solvent by a gel

Malleability - ANSWER- A material's capacity to be shaped by force or pressure

Microleakage (percolation) - ANSWER- Passage of oral fluids/bacteria into and
out of tooth structure due to marginal gap or failure of marginal (restorative) seal

Polymerization - ANSWER- The linking, branching, or cross-linking of smaller
molecules

, Proportional limit - ANSWER- The force at which a material cannot return to its
original shape

Syneresis - ANSWER- Contraction of a gel due to the loss of a solvent

Tensile strength - ANSWER- The force needed to stretch a material to the point of
fracture

Viscocity - ANSWER- Resistance to flow

Amalgam - ANSWER- By definition: an alloy of mercury
In dentistry: an alloy of mercury with silver, copper, tin, and zinc
Silver, a base metal, susceptible to corrosion
Copper added to minimize the corrosion (gamma II phase eliminated)

Amalgam desirable features - ANSWER- Durable
Similar compressive strength to enamel
Relatively inexpensive

Amalgam undesirable features - ANSWER- Unattractive
High thermal conductivity
Dimensionally unstable (creep)
Delayed expansion if contaminated by saliva
Requires tooth support
Fracturable by excessive occlusion
Susceptible to galvanism when new

Polishing Amalgam - ANSWER- Move from coarse to fine agents to remove
surface tarnish, stains, flash and roughness
Polishing can reduce rate of corrosion (less surface area)
Final polish in mouth is tin oxide
Use light touch with water and short bursts to avoid odontoblast damaging heat

Ways to avoid amalgam overhang formation - ANSWER- Using properly placed
band and wedge(s)
Detect overhang with explorer

Bonding agents; Dental Resins (BIS-GMA* or urethane dimethacrylate) -
ANSWER- Establishes micro mechanical retention with enamel and dentin by
adapting to relief areas created by conditioning with phosphoric acid

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