EFDA Oregon study Exam Questions
and Answers 100% Pass
Etchant ? - ✔✔Critical for enamel and dentin in the cavity prep for good chemical
bond.
Glass Ionomer used as a base? - ✔✔Good adhesion to enamel and dentin, release
fluoride and has bonding strengths.
Zinc-oxide-eugenol type 1used as a base? - ✔✔Sedative, insulating helps with irrated
pulp. CANT USE UNDER GLASS IONOMER AND COMPOSTIE.
Zinc phosphate type 2 used as a base? - ✔✔Good base for it thermal insulation qualities
and can be used under polycarboxylate, ionomer and it can irrate the pulp.
Trituration - ✔✔Means mixing dental alloy with mercury.
Amalgamation - ✔✔Actual chemical reaction that occurs between the alloy and
mercury.
Alloy - ✔✔Combination between alloy and mercury.
Polycarboxylate used as a base? - ✔✔Has elastic properties and contains fluoride and
can be put under any restoration. Also proactive and insulating.
IRM used as a base? - ✔✔last for 6-12 months and is temp. Also has a sedative base.
Sedative base ? - ✔✔Help with soothing the pulp for decay that is irrating the pulp.
© EMILY CHARLENE YEAR 2025-2026, ALL RIGHTS RESERVED 1
, Insulating base? - ✔✔Placed in deep cavity preps to protect the tooth from thermal
shock.
Protective base? - ✔✔Placed before the restoration is place to protect the pulp.
Primer? - ✔✔Can also be know as desensitizer. Placed under restorative material.
Fluoride varnish? - ✔✔Release fluoride on enamel, root structure and the dentin
surfaces.
Varnish? - ✔✔Organic solvent, seals dentin tubules and reduces microleakage.
Micro- mechanical? - ✔✔Retention between the tooth structure and the restoration.
Three things dental bases can do for the tooth? - ✔✔1. protective base
2. insulating base
3. sedative base
Calcium Hydroxide? - ✔✔Used as a base/ liner, promotes secondary dentin.
Smear layer? - ✔✔Very thin layer of debris on newly prepared dentin.
Crown matrix former? - ✔✔Plastic form that is shaped as a crown. You put prepared
cement in the crown former.
Provisional? - ✔✔temporary cement until the permant restoration is ready to be
cemented.
Permant Polycarboxylate? - ✔✔Cement stainless steel crowns, and ortho bands.
ZOE TYPE 2 (perm) - ✔✔Type one isn't strong enough. Type two is strong enough to
use for perm cementation.
© EMILY CHARLENE YEAR 2025-2026, ALL RIGHTS RESERVED 2
and Answers 100% Pass
Etchant ? - ✔✔Critical for enamel and dentin in the cavity prep for good chemical
bond.
Glass Ionomer used as a base? - ✔✔Good adhesion to enamel and dentin, release
fluoride and has bonding strengths.
Zinc-oxide-eugenol type 1used as a base? - ✔✔Sedative, insulating helps with irrated
pulp. CANT USE UNDER GLASS IONOMER AND COMPOSTIE.
Zinc phosphate type 2 used as a base? - ✔✔Good base for it thermal insulation qualities
and can be used under polycarboxylate, ionomer and it can irrate the pulp.
Trituration - ✔✔Means mixing dental alloy with mercury.
Amalgamation - ✔✔Actual chemical reaction that occurs between the alloy and
mercury.
Alloy - ✔✔Combination between alloy and mercury.
Polycarboxylate used as a base? - ✔✔Has elastic properties and contains fluoride and
can be put under any restoration. Also proactive and insulating.
IRM used as a base? - ✔✔last for 6-12 months and is temp. Also has a sedative base.
Sedative base ? - ✔✔Help with soothing the pulp for decay that is irrating the pulp.
© EMILY CHARLENE YEAR 2025-2026, ALL RIGHTS RESERVED 1
, Insulating base? - ✔✔Placed in deep cavity preps to protect the tooth from thermal
shock.
Protective base? - ✔✔Placed before the restoration is place to protect the pulp.
Primer? - ✔✔Can also be know as desensitizer. Placed under restorative material.
Fluoride varnish? - ✔✔Release fluoride on enamel, root structure and the dentin
surfaces.
Varnish? - ✔✔Organic solvent, seals dentin tubules and reduces microleakage.
Micro- mechanical? - ✔✔Retention between the tooth structure and the restoration.
Three things dental bases can do for the tooth? - ✔✔1. protective base
2. insulating base
3. sedative base
Calcium Hydroxide? - ✔✔Used as a base/ liner, promotes secondary dentin.
Smear layer? - ✔✔Very thin layer of debris on newly prepared dentin.
Crown matrix former? - ✔✔Plastic form that is shaped as a crown. You put prepared
cement in the crown former.
Provisional? - ✔✔temporary cement until the permant restoration is ready to be
cemented.
Permant Polycarboxylate? - ✔✔Cement stainless steel crowns, and ortho bands.
ZOE TYPE 2 (perm) - ✔✔Type one isn't strong enough. Type two is strong enough to
use for perm cementation.
© EMILY CHARLENE YEAR 2025-2026, ALL RIGHTS RESERVED 2
