Dental Materials Unit 2 Exam

What does the MOHS scale rank

Relative abrasion resistance, relative hardness

Why do we polish a restoration

To remove excess material, smooth rough surfaces and aesthetics

What is an impression

A negative mold to create a positive replication

What is the anatomic portion of a model

Part of the study model that records the hard and soft tissue

What materials can be used for provisionals

Stainless steel crown, acrylic and composite

What is a polymer

The powder in an acrylic mix

What are diagnostic casts used for

Patient education and records

What is the purpose of crosslinking polymers

Used to improve physical and mechanical property of a final product

What is alginate

An irreversible hydrocolloid and preliminary impression material

What is a provisional

A temporary restoration such as crown or bridges

What is the art portion of a model

Plaster or stone base that supports the anatomical portion of a model

What is the first step after taking an impression

Disinfect it

What are types of elastomeric impression material

Polyvinyl siloxane

What is crosslinking of polymers

Used to improve physical and mechanical properties

What is a monomer

The liquid in an acrylic mix

What is used to add to the back of an impression tray if it does not fit properly

Utility wax rope, adapts the periphery of impression tray to fit pt mouth better

What is a preliminary impression used for

Diagnostic study model, custom tray and provisional restoration

What determines a proper fit of a provisional restoration

Interproximal surface that contacts adjacent teeth

What is PVS alginate

Most commonly used material

What are wax bite wafers and elastomeric impression material used for

Bite registration “occlusal”

How do we store wax bites

A cool dry place

PVS alginate advantages

Dimensionally stable, can be repoured repeatedly, doesn’t need to be poured instantly

Trimming Maxillary steps

Back, side premolar to molar parallel , canine to central both sides, heel cut

Trimming Mandibular steps

Back, side premolar to molar parallel, canine to canine rounded, heel cut