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DENT MAT PRELIM

QuestionAnswer
- “Father of Modern Dentistry” Pierre Fauchard
– wax impressions & plaster models Pfaff
– patented “mineral paste” porcelain teeth de Chamant
- pioneered restorative dentistry G.V Black
a measure of how much it expands per unit length if heated one degree higher. Linear Coefficient of thermal expansion (LCTE)
results from the presence of dissimilar metals in the mouth Galvanism
Dissolution of metals in the mouth result from galvanism or from chemical attacks of metals by food or saliva Corrosion
- concentration of molecules at the surface of a solid or liquid, Adsorption
(grinding) If the direction of the force is towards the center Compressive stress
(chewing sideways/ sliding) Chewing sideways, the direction of the force passed through both ways Shear stress
discontact of teeth when chewing when pulled apart Tensile stress
the change in length of a material produced by stress. Strain
a measure of the stiffness of a material Elastic modulus/ Modulus of Elasticity
measures of the stress allowed before permanent deformation Proportional limit and Yield strength
the stress at which fracture occurs Ultimate strength
= ductility Elongation
= malleability Compression
: energy to deform a material Resilience
: energy to fracture a material Toughness
the resistance of a material to indentation & scratching Hardness
Raw material gypsum Calcium sulfate dihydrate
heating process to remove the water of crystallization turning it into a powder CALCINATION
- temperature lag between gel temperature and liquefaction temperature Hysteresis
- shrinkage due to dehydration Syneresis
- swelling due to water absorption Imbibition
Created by: nixieee
 

 



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