Dental Materials & Properties
What is the difference between ductility and malleability?
Ductility is the ability of a material to have its shape changed by being stretched or pulled
Malleability is the measure of a material's ability to be extended in all directions by a compressive force.
The purpose of a dental liner
What are pulpal protection and the promotion of healing?
A luting agent
What is a cement used to seat crowns, bridges, or inlays/onlays?
Alginate is used for
What are preliminary impressions for study models?
A dental lathe
What is used for polishing dental appliances?
Two materials used for esthetic restorations
One unique property of calcium hydroxide
What is the stimulation of secondary dentin formation?
One temporary cement and its use
The definitions of imbibition and syneresis
Syneresis: What is loss of water?
Imbibition: What is absorption of water?
Two safety precautions in the dental lab
What are wearing PPE and handling chemicals/materials according to SDS or manufacturing instructions?
The cause of galvanic shock in the oral cavity
What is two dissimilar metals in saliva?
The smear layer (definition and why it is removed).
What is a layer of debris on dentin? It is removed to allow proper bonding by the opening of dentinal tubules.
An exothermic reaction during cement mixing
What is heat released during chemical setting?
The curing stages of elastomeric materials
What are initial set, final set, and final cure?
The double-pour method
What is the technique used when the anatomic portion is poured first and then a second mix is prepared for the art portion? A base/mold is used for the art portion.
Four metals used in amalgam alloy and their functions
What are silver (strength), tin (workability), copper (corrosion reduction), and zinc (oxidation reduction)?
The bonding process for dentin
What are etching, priming, and bonding resin application?
The difference between resin-based and glass ionomer cements
Resin: added strength, better esthetics.
GI: Fluoride release.
The difference between stock and custom trays
Stock: What is pre-made/standard fit?
Custom: What is specifically made for an individual patient?
Vacuum former
What is used to make custom trays and mouthguards?
Thermal changes affect dental materials
What are expansion and contraction that cause leakage and or fracture?
The process of applying dental varnish
What is applying a thin layer to cavity walls before restoration?
The three classifications of dental cements
What are luting agents, bases, and liners?
Hysteresis in a reversible hydrocolloid
What is the difference in temperature to allow for transformation from one physical state (sol) to another (gel)?
Three types of dental waxes and their uses
What are pattern wax (casting), processing wax (lab procedures), impression wax (bite registration), boxing wax (form around an impression for pouring), sticky wax (casting), Baseplate (occlusal rims), corrective impression wax (used with other impression materials).