Chapter 3: Physical and Mechanical Properties of Dental Materials Flashcards
What is the hardness, and likelihood of breaking or cracking, of a material?
Brittleness
What is the measure of the weight of a material compared with its volume?
Density
What is the resistance of a solid to penetration?
Hardness
What is the maximal amount of stress a material can withstand without breaking?
Ultimate strength
What is the ability of a material to recover its shape completely after deformation from an applied force?
Elasticity
What is the greatest stress a structure can withstand without permanent deformation?
Proportional limit
What is the ability of an object to be pulled or stretched under tension without rupture?
Ductility
What is the ability to be compressed and formed into a thin sheet without rupture?
Malleability
What are restorations placed directly into a cavity preparation?
Direct restorative material
What are materials used to fabricate restorations outside the mouth that are subsequently placed into the mouth?
Indirect restorative material
What is the amount of time allotted to bring the components of a material together into a homogeneous mix?
Mixing time
What is the time permitted to place and manipulate the material in the mouth?
Working time
What is the time at which the material can no longer be manipulated in the mouth?
Initial set time
What is the time at which the material has reached its ultimate state?
Final set time
What are the materials that set through a timed chemical reaction with the combination of a catalyst and base?
Chemical set materials
