Operative Test 1 Flashcards
GI is _ based
Composites are _ based
Water
Polymer
How does GI attach
Chelates with HA surfaces
Composite adhesives need what
Demineralized dentin surface with exposed collagen
GI conditioners are what and what do they do
Mild organic acids
Solubilizes smear layer
Removes smear layer
Leaves smear plugs intact
T/F conditioners demineralization dentin and enamel
False. Don’t demineralization either
Conditioners vs. enchants
C: leaves smear plugs intact
Doesn’t demineralize
Cleans surface
E: removes smear layer
Demineralizes surface dentin
Leaves collagen surface with pores
What s the powder in RMGI
What is the liquid GI vs. RMGI and pH
CaFAlSiO2 glass
GI:
Water
Polyacid copolymers
pH 1
RMGI: 35% water 35% methacrylate modified polyacid copolymers 30% HEMA pH 2
Disadvantages of GI
Slow setting Early dissolution Opaque Bad stain resistance Weak
Class V axial depth
1.2
4 functions of dentin/pulp complex
Formative (1/2 dentin)
Defensive (reparative dentin)
Nutritive
Sensory
5 things tubule fluids detect
Osmolarity changes Thermal changes Desiccation Pressure changes High-speed cutting
Reversible pulpitis needs to be treated how
With a base
3 tests to test pulp status
Cold/hot
Electric pulp test
Percussion test
Purpose of liners and bases
Protect pulp and minimize sensitivity
Liner to use with amalgam
Copalite
Liner to use with composite
Vitribond, seals dentin below composite
Purposes of liners
Protect dentin from residual reactants
Electrical insulation
Thermal protection
Pulpal treatment
Why are liners important for composites
Etching can cause a negative rxn if not sealed
5 types of liners and an example of each
Solution liners(copalite, adhesive)
Suspension liners(CaOH2)
Cement liner (GI)
Eugenol liners (ZOE)
Dentin bonding systems (optibond)
Setting rxn of solution liner
Evaporation
Affected vs. infected dentin
Take out infected dentin
Leave affected dentin
4 types of bases
Zinc phosphate
ZOE
Polycarboxylate
GI/RMGI
What do you use with RMGI
Light cured CaOH
Where do you mix ZnPO4, why
On a cool slab, absorbs heat of rxn and permits more powder to be incorporated
GI vs ZnPO4
GI: adheres to tooth structure Fluoride release Better retention Dimensionally stable Biocompatible
How do CaOH liners work
Release OH ions
Stimulate odontoblast formation
ZOE is a _ _ material
Intermediate restorative material
For deep excavation (RDT <0.5 mm), OSU recommends _ after _
GI/RMGI after CaOH
When to replace a cusp
Facial or lingual extension exceeds 2/3 from primary groove to cusp tip
Pin size we use
0.021”/ 0.525mm
2/2/2/2 rule
2mm pin hole depth
2 drill diameters inside DEJ
2mm length of pin
2mm of amalgam over pin
