NDAEB 2025 EXAM QUESTIONS AND
CORRECT DETAILED ANSWERS WITH
RATIONALES (VERIFIED ANSWERS)
ALREADY GRADED A+
Incisors are used for - ans✔cutting
canines are used for - ans✔Holding
Posterior teeth are used for - ans✔Biting and chewing
Premolars are used for - ans✔Hold and grind
Enamel is - ans✔96% in organic
Dentin is - ans✔70% inorganic
dentinogenesis imperfecta - ans✔incomplete or improper development of dentin tissue
Dentin and cementum can - ans✔Repair itself
Cementum - ans✔50% inorganic
primary teeth - ans✔Wider mesial to distal
Short crowns
Thinner enamel/dentin (more white)
Permanent teeth - ans✔Smaller pulp chamber
Larger roots
Not as white
What tooth is unlike any other tooth in either dentition? - ans✔Primary maxillary 1 molar
Ester - ans✔Topical
More chance of allergy
Milliamperage (mA) - ans✔A measurement unit for electrical current
,Kilovoltage peak (kVp) - ans✔The maximum or peak voltage that is used during an x-
ray exposure.
Critical organgs - ans✔Eyes
Bone marrow
Thyroid gland
Skin
trabeculae - ans✔supporting bundles of bony fibers in cancellous (spongy) bone
Make spaces filled with bone marrow
filiform papillae - ans✔Touch
Epithelial attachment - ans✔Healthy gingivae cover the alveolar bone and attach to the
teeth on the enamel surface just above the neck of the tooth. This structure is known as
the
lamina dura - ans✔thin compact bone that lines the alveolar socket
Incisive papilla - ans✔Pear-shaped pad of tissue that covers the incisive foramen
gingival sulcus - ans✔Rarely 2-3mm deep
Structure units of enamel - ans✔Prisms
Interradicular fibers - ans✔Aid in resisting of tipping and twisting
alveolar process - ans✔a ridge that forms the borders of the upper and lower jaws and
contains the sockets of the teeth
Support teeth in functional position
circular fiber group - ans✔Form neck of teeth
Free gingiva - ans✔Base of sulcus to mucogingival junction
Height of contour - ans✔widest part of the tooth
primate - ans✔Normal spaces in primary teeth
Cusp of Carabelli - ans✔a fifth cusp on the mesial lingual surface of most maxillary first
molars
Gingival papilla - ans✔The gingival projection that fills the interproximal space
taste receptors - ans✔Tip of tongue
,lacrimal bone - ans✔small fragile bone making up part of the front inner walls of each
eye socket and providing room for the passage of the lacrimal ducts
contact point - ans✔The exact spot at which the teeth actually touch each other.
Curve of Spee - ans✔Curvature formed by the maxillary and mandibular arches in
occlusion
Polycarboxylate - ans✔permanent cementation for crowns, inlays, onlays, and bridges
Strength and non irritating quality
Copland varnish - ans✔Good for amalgam
zinc oxide eugenol - ans✔Temporary cement - sedates the pulp
Powder to water ratio - ans✔Depends on intended use
Polycarboxylate finished - ans✔Glossy
Type 1 zinc phosphate - ans✔Accurate seating
Etch - ans✔Better adhesion
zinc phosphate - ans✔Luting agent for permanent restorations
Varnish - ans✔Over liner or base
GI capsules mixed - ans✔Mechanical trituration
mixing zinc phosphate - ans✔Dry cool slab decreases setting time
Macrofilled composites - ans✔Strength
Smooth tray use - ans✔Adhesive before final impression material
Wash - ans✔Syringe material
No bubbles in light bodied material - ans✔Extruding with keeping tip in the material
Vinyl gloves - ans✔Silicon putty
Polysiloxane - ans✔condensation silicone, impression material, mixing time 30-45
seconds. (THICK)
Light bodied material around tooth - ans✔Before heavy bodied
, Extruder guns - ans✔Mixes material through mixing tip as it moves
Hydrophobic - ans✔water hating
Auto cure composite resin - ans✔Activate setting process
Bonding system - ans✔Supplemental to mechanical retention
tensile strength - ans✔A measure of how much stress from pulling, or tension, a
material can withstand before breaking.
porcelain - ans✔Most used ceramic
Gold alloy removable partial denture - ans✔extra hard, type lV
Luting - ans✔Bonding or cementing together
adding water to gypsum - ans✔makes weaker
box and pour method - ans✔The impression is surrounded with a "box" made from
boxing wax
First woman to graduate from dental school - ans✔Lucy Hobbs Taylor
Short acting local anesthetics - ans✔60-180mins
Color coding system - ans✔correct ratio
correct brand
Needle length - ans✔1 5/8 inches
any infection - ans✔anesthetic won't work
general anesthesia - ans✔safest in hospital
general anesthesia stages - ans✔stage 1: beginning anesthesia
stage 2: excitement
stage 3: surgical anesthesia
stage 4: medullary depression
blister - ans✔a lesion that extends above mucosal surface
benign tumor - ans✔not a form of cancer, and it is not life-threatening
a neoplasm
CORRECT DETAILED ANSWERS WITH
RATIONALES (VERIFIED ANSWERS)
ALREADY GRADED A+
Incisors are used for - ans✔cutting
canines are used for - ans✔Holding
Posterior teeth are used for - ans✔Biting and chewing
Premolars are used for - ans✔Hold and grind
Enamel is - ans✔96% in organic
Dentin is - ans✔70% inorganic
dentinogenesis imperfecta - ans✔incomplete or improper development of dentin tissue
Dentin and cementum can - ans✔Repair itself
Cementum - ans✔50% inorganic
primary teeth - ans✔Wider mesial to distal
Short crowns
Thinner enamel/dentin (more white)
Permanent teeth - ans✔Smaller pulp chamber
Larger roots
Not as white
What tooth is unlike any other tooth in either dentition? - ans✔Primary maxillary 1 molar
Ester - ans✔Topical
More chance of allergy
Milliamperage (mA) - ans✔A measurement unit for electrical current
,Kilovoltage peak (kVp) - ans✔The maximum or peak voltage that is used during an x-
ray exposure.
Critical organgs - ans✔Eyes
Bone marrow
Thyroid gland
Skin
trabeculae - ans✔supporting bundles of bony fibers in cancellous (spongy) bone
Make spaces filled with bone marrow
filiform papillae - ans✔Touch
Epithelial attachment - ans✔Healthy gingivae cover the alveolar bone and attach to the
teeth on the enamel surface just above the neck of the tooth. This structure is known as
the
lamina dura - ans✔thin compact bone that lines the alveolar socket
Incisive papilla - ans✔Pear-shaped pad of tissue that covers the incisive foramen
gingival sulcus - ans✔Rarely 2-3mm deep
Structure units of enamel - ans✔Prisms
Interradicular fibers - ans✔Aid in resisting of tipping and twisting
alveolar process - ans✔a ridge that forms the borders of the upper and lower jaws and
contains the sockets of the teeth
Support teeth in functional position
circular fiber group - ans✔Form neck of teeth
Free gingiva - ans✔Base of sulcus to mucogingival junction
Height of contour - ans✔widest part of the tooth
primate - ans✔Normal spaces in primary teeth
Cusp of Carabelli - ans✔a fifth cusp on the mesial lingual surface of most maxillary first
molars
Gingival papilla - ans✔The gingival projection that fills the interproximal space
taste receptors - ans✔Tip of tongue
,lacrimal bone - ans✔small fragile bone making up part of the front inner walls of each
eye socket and providing room for the passage of the lacrimal ducts
contact point - ans✔The exact spot at which the teeth actually touch each other.
Curve of Spee - ans✔Curvature formed by the maxillary and mandibular arches in
occlusion
Polycarboxylate - ans✔permanent cementation for crowns, inlays, onlays, and bridges
Strength and non irritating quality
Copland varnish - ans✔Good for amalgam
zinc oxide eugenol - ans✔Temporary cement - sedates the pulp
Powder to water ratio - ans✔Depends on intended use
Polycarboxylate finished - ans✔Glossy
Type 1 zinc phosphate - ans✔Accurate seating
Etch - ans✔Better adhesion
zinc phosphate - ans✔Luting agent for permanent restorations
Varnish - ans✔Over liner or base
GI capsules mixed - ans✔Mechanical trituration
mixing zinc phosphate - ans✔Dry cool slab decreases setting time
Macrofilled composites - ans✔Strength
Smooth tray use - ans✔Adhesive before final impression material
Wash - ans✔Syringe material
No bubbles in light bodied material - ans✔Extruding with keeping tip in the material
Vinyl gloves - ans✔Silicon putty
Polysiloxane - ans✔condensation silicone, impression material, mixing time 30-45
seconds. (THICK)
Light bodied material around tooth - ans✔Before heavy bodied
, Extruder guns - ans✔Mixes material through mixing tip as it moves
Hydrophobic - ans✔water hating
Auto cure composite resin - ans✔Activate setting process
Bonding system - ans✔Supplemental to mechanical retention
tensile strength - ans✔A measure of how much stress from pulling, or tension, a
material can withstand before breaking.
porcelain - ans✔Most used ceramic
Gold alloy removable partial denture - ans✔extra hard, type lV
Luting - ans✔Bonding or cementing together
adding water to gypsum - ans✔makes weaker
box and pour method - ans✔The impression is surrounded with a "box" made from
boxing wax
First woman to graduate from dental school - ans✔Lucy Hobbs Taylor
Short acting local anesthetics - ans✔60-180mins
Color coding system - ans✔correct ratio
correct brand
Needle length - ans✔1 5/8 inches
any infection - ans✔anesthetic won't work
general anesthesia - ans✔safest in hospital
general anesthesia stages - ans✔stage 1: beginning anesthesia
stage 2: excitement
stage 3: surgical anesthesia
stage 4: medullary depression
blister - ans✔a lesion that extends above mucosal surface
benign tumor - ans✔not a form of cancer, and it is not life-threatening
a neoplasm
