L116: Fundamentals of Dental Materials Science Flashcards
What are the main things to consider when choosing a dental material?
- What is available for the treatment?;
- Is it fluoride releasing?;
- Composition;
- Characteristics;
- Working and setting time.
What is amalgam creep?
The movement (change of shape and protrusion) of amalgam over time.
What kind of forces can cause amalgam to fracture over time?
Continuous low level forces
What component of composite filling determines its viscosity?
Glass filler particles
What is the purpose of etching teeth prior to the application of composite?
To create a rough surface on the tooth, leading to better adhesion to the tooth material and surrounding enamel
What is the purpose of fluoride releasing restorative materials?
To increase the enamel’s resistance to development of caries
Does amalgam or composite resist compressive strength/ fracturing best?
Amalgam
What is thermal expansion and why must restorative material expand/contract?
Expansion and contraction with the tooth material to prevent microleakage and further caries
Low viscosity impression materials…
are most accurate for recording tooth surface detail.
High viscosity impression materials…
are most dimensionally stable after setting and removing.
Which type of impression material is used in impression trays?
High viscosity
Which type of impression material is used around individual teeth?
Low viscosity
Give an example of a negative replica:
Impression
Give an example of a positive replica:
Dental cast
Young’s modulus =
Elasticity