NBDE Part II - Operative UPDATED ACTUAL Questions and
CORRECT Answers
dentin bonding mechanisms relay on what? properties of difunctional coupling agents (i.e. silane)
able to penetrate into moist dentin surfaces and copolymerize with composite
resins
majority of bond strength is obtained from what? penetration and adaptation of the bonding agent to the demineralized
interlobular dentin and exposed collagen fibers
optimal range of drinking water fluoridation defined by 0.7 - 1.2 ppm
the CDC?
benzoyl peroxide is used for what? as an initiator for self-cure or auto-curing composite resins
attrition loss of tooth structure by contact with another tooth
abrasion loss of tooth structure by external source
erosion loss of tooth structure through chemical dissolution by acids NOT of bacterial
origin
abfraction loss of tooth structure caused by flexural forces applied by cyclic loading of
enamel that occurs at the CEJ
non-carious loss of cervical tooth structure that occurs due to cyclic loading of
teeth by occlusal forces
compound caries are found where? 2 surfaces of the same tooth
complex caries are found where? more than 2 tooth surfaces
the formation of ________ induces sealants to polymerize free radicals
water absorption is greater in smaller particles or larger larger particles
particles?
water absorption is greater in higher filler contents or lower filler content
lower filler content?
dentin smear layer debris, calcific in nature, that is produced by reduction instrumentation of enamel,
dentin, and cementum
interferes with any adhesive bond formed between tooth structure and
restorative
, dentin smear layer removal leads to what? makes micro leakage more significant (bc barrier of bacteria to pulp is removed)
increases dentin wetness
increases bond strength
advantages of indirect resin restorations over direct 1. improved proximal contacts
restorations 2. decreased marginal leakage
3. increased strength
4. decreased post-operative sensitivity
when restorations are finished with smooth surfaces, what larger size
impression does it give off?
what are the indications for resin composite in posterior 1. buccal lingual width of preparation is LESS than 1/3 intercuspal distance
teeth?
2. gingival margin of preparation is on intact enamel
3. esthetics are important
NOT for large preparations
flowable resin composites vs inferior conventional flowable resin composites have inferior mechanical properties compared to
composite traditional resin composites
which factor of caries susceptibility is modified most by host
occlusal sealants?
where should the rubber dam be punched for a class V 1mm facial to the designated tooth
restoration?
initial demineralization of enamel occurs at which pH? 5.5
how deep should retention grooves be placed to resist 0.5mm
explorer tip displacement?
which enamel bevel do you place on the facial side of a esthetic bevel
class IV preparation?
what describes the line or angle formed by the junction cavosurface angle
of a cavity wall with the unprepared surface of the tooth?
angle formed between 2 cavity walls and a floor or point angle
between three angles
angle formed between 2 walls or a wall and a floor of a line angle
cavity
where 2 walls of a prepared cavity meet
CORRECT Answers
dentin bonding mechanisms relay on what? properties of difunctional coupling agents (i.e. silane)
able to penetrate into moist dentin surfaces and copolymerize with composite
resins
majority of bond strength is obtained from what? penetration and adaptation of the bonding agent to the demineralized
interlobular dentin and exposed collagen fibers
optimal range of drinking water fluoridation defined by 0.7 - 1.2 ppm
the CDC?
benzoyl peroxide is used for what? as an initiator for self-cure or auto-curing composite resins
attrition loss of tooth structure by contact with another tooth
abrasion loss of tooth structure by external source
erosion loss of tooth structure through chemical dissolution by acids NOT of bacterial
origin
abfraction loss of tooth structure caused by flexural forces applied by cyclic loading of
enamel that occurs at the CEJ
non-carious loss of cervical tooth structure that occurs due to cyclic loading of
teeth by occlusal forces
compound caries are found where? 2 surfaces of the same tooth
complex caries are found where? more than 2 tooth surfaces
the formation of ________ induces sealants to polymerize free radicals
water absorption is greater in smaller particles or larger larger particles
particles?
water absorption is greater in higher filler contents or lower filler content
lower filler content?
dentin smear layer debris, calcific in nature, that is produced by reduction instrumentation of enamel,
dentin, and cementum
interferes with any adhesive bond formed between tooth structure and
restorative
, dentin smear layer removal leads to what? makes micro leakage more significant (bc barrier of bacteria to pulp is removed)
increases dentin wetness
increases bond strength
advantages of indirect resin restorations over direct 1. improved proximal contacts
restorations 2. decreased marginal leakage
3. increased strength
4. decreased post-operative sensitivity
when restorations are finished with smooth surfaces, what larger size
impression does it give off?
what are the indications for resin composite in posterior 1. buccal lingual width of preparation is LESS than 1/3 intercuspal distance
teeth?
2. gingival margin of preparation is on intact enamel
3. esthetics are important
NOT for large preparations
flowable resin composites vs inferior conventional flowable resin composites have inferior mechanical properties compared to
composite traditional resin composites
which factor of caries susceptibility is modified most by host
occlusal sealants?
where should the rubber dam be punched for a class V 1mm facial to the designated tooth
restoration?
initial demineralization of enamel occurs at which pH? 5.5
how deep should retention grooves be placed to resist 0.5mm
explorer tip displacement?
which enamel bevel do you place on the facial side of a esthetic bevel
class IV preparation?
what describes the line or angle formed by the junction cavosurface angle
of a cavity wall with the unprepared surface of the tooth?
angle formed between 2 cavity walls and a floor or point angle
between three angles
angle formed between 2 walls or a wall and a floor of a line angle
cavity
where 2 walls of a prepared cavity meet
