Restoration Materials & Instruments Flashcards
What does good cavity prep consist of?
Removal of all caries
Removal of minimum amount of healthy tissue
Avoid accidental exposure of pulp
Protect pulp (linings)
Produce a retentive cavity for restoration
Factors that affect the choice of restoration?
Cavity size Cavity position Tooth involvement Extent of caries Patient's wishes
What is the purpose of a mouth mirror?
To aid vision
Reflect light onto tooth
Retract and protect soft tissues
Purpose of right angled probe?
Check aviary margins
Assess soft dentine with a cavity
Detect overhangs in restorations
Purpose of excavators?
Removes softened dentine
Small/large spooned shape
Purpose of an amalgam plugger?
Packer
Push and adapt filling material to suit cavity shape
Make sure that no air spaces are left
Purpose of a burnisher?
Press and adapt restoration to the cavity margins to prevent leakages
Ball/pear shaped
Purpose of enamel chisel?
Remove unsupported enamel from cavity edges
Item is becoming obsolete and is being replaced with the use of various burs
What are methods of moisture control?
High speed suction Low speed suction Cotton wool Dry guards Rubber dam 3in1 tip
Another name for fast handpiece?
Air Turbine
How many revolutions does a fast handpiece do per minute?
500,000
How many revolutions does a slow hand piece do per minute?
40,000
What does a round bur do?
Gains access to cavities and at a low speed for removing caries
What does a pear shaped but do?
Shapes and smooths cavities
What does a fissure but do?
Shapes and outlines cavities
Types of mandrels
Huey mandrel
Moore mandrel
Pinhead mandrel
What is the purpose of restorative materials?
Prevent pain/sensitivity
Restore function
Improve aesthetics
Types of temporary restorations
Zinc oxide and eugenol
Zinc phosphate
Zinc polycarboxylate
What is zinc oxide and eugenol used for?
Cavity liner
Temp dressing with soothing qualities
Temp cement
What is zinc phosphate used for?
(Thick) temp fill or base of permanent restoration
(Thin) luring cement: crown, inlay,ortho
What is zinc polycarboxylate used for?
Cement crowns,bridges,inlays & ortho
Cavity lining
Temp filling or deciduous teeth permanent
What is the purpose of a lining?
To protect pulp from thermal shock
Encourage secondary dentine
What is the chemical symbol for amalgam?
Hg
What is amalgam made up of?
Silver up to 74%
Copper up to 30%
Tim
Zinc
What are dentine pins used for?
Improves retention of restoration
What does a matrix system do?
Prevents overhangs
Holds filling
What are the two types of matrix systems?
Siqveland and tofflemire
What is a matrix system used for class V restorations?
Cervical
What is the instrument used for supra-gingival calculus?
Jaquette
What are wedges used for?
Placed inter dentally to help secure matrix system
What are the five finishing instruments?
Ward's carve Flat plastic Burnisher Greenstone drills Articulating paper
What are the three way mercury poisoning can occur?
Inhalation
Ingestion
Absorption
Which waste does amalgam go into?
Special containers
Hazardous waste - non infectious/chemical
What are the three types of composite?
Microfine composites - anterior teeth/polishes/glosses
Hybrid comp - posterior teeth/high strength/ better wear resistance
Universal comp - anterior & posterior/combo of both
How much phosphoric acid is in etch?
33%
What material would be used for class V restorations?
Glass ionomer
