Oral Anatomy: General Flashcards
T/F: Incisors are all longer incisogingivally than mesiodistally.
True
In most incisors, the crown outlines on the ______ are more convex than on the ______.
distal; mesial
*Mandibular central is symmetrical
The distoincisal line angles are often more _______ than the mesioincisal line angles.
obtuse
In most incisors, the _________ contact is in the incisal third, while the _______ contact is more cervical.
distal; mesial
*mandibular centrals
T/F: Roots of most incisors are wider faciolingually than mesiodistally.
True
*Max centrals are about equal
What is the most common bend in incisor roots?
Distal bend in apical third of root
T/F: Crowns of incisors are often slightly longer than their roots.
False
Longer roots
Where are the facial and lingual crests of curvature for incisors?
Cervical third
T/F: The C:R ratio on max centrals is going to be closer to 1 than on laterals.
True
Laterals have proportionally longer roots/smaller crowns
T/F: The cingula of max central incisors are off-center to the mesial.
False
Distal (max laterals are centered)
T/F: Humans have a heterodont dentition.
True
Teeth have different morphology
T/F: Humans have a diphyodont dentition.
True
Two sets of teeth
What are lobes and what seperates the lobes of teeth?
Lobe = the primary center of enamel formation (cusps, mamelons, cingula)
Seperated by developmental depressions or grooves
How many mamelons are seen on incisors?
Three (one for each facial lobe)
T/F: The incisal edge of a canine is considered a cusp.
True
A _________ is an extra formation of enamel on the crown of a tooth (ex. cusp of Carabelli)
tubercle
The ___________ runs incisocervically in the center of the facial crown surface and is only found on canines.
labial ridge (esp on maxillary canines)
The _____________ runs occlusocervically in the center of the buccal crown surface and is only found on premolars.
buccal (cusp) ridge
esp on 1st premolars
Which teeth exhibit a cervical ridge that runs mesiodistally in the cervical third of the buccal surface of the crown?
All primary teeth and permanent molars
Which way does the oblique ridge run and on which teeth is it found?
Runs from ML to DB cusps
Found on all maxillary molars
T/F: There is a triangular ridge on all posterior teeth.
True
Which cusp has two triangular ridges?
The ML cusp of maxillary molars
_________ are most common on maxillary premolars and mandibular molars. They connect triangular ridges from buccal and lingual cusps.
Transverse ridges
Which teeth are least likely to be lost to carries?
Mandibular incisors
A ____________ is a well-defined, shallow, linear depression in enamel that separates cusps, lobes, and marginal ridges.
Developmental groove
A __________ is a narrow crevice at the deepest portion of the developmental groove.
fissure
T/F: Pits are found at the termination or junction of developmental grooves.
True
T/F: Supplemental grooves are linear grooves that separate major tooth parts.
False
Small irregularly shaped, do not separate major tooth parts
T/F: All teeth have four point angles.
True
Anterior teeth have ___ line angles. Posterior teeth have ____ line angles.
6; 8
Where is the largest occlusal embrasure?
Between max canine and PM1
Which is the largest incisal embrasure?
Between max lateral and canine
Which is the smallest incisal embrasure?
between mandibular centrals
Lingual embrasures are typically larger than buccal embrasures except in which teeth?
The buccal embrasures of the max M1 are larger than lingual embrasures
All dental and periodontal arterial supply arises from the __________.
maxillary artery
All dental and periodontal venous return drains to the _____________.
pterygoid plexus of veins
The mesial contact is always more _________ than the distal.
Incisal
In general contacts are located more incisally from posterior to anterior
T/F: All contacts are located in the middle 1/3 from the occlusal view.
True
Posterior contacts are slightly buccal
The facial and lingual surfaces of all teeth are _________.
trapezoidal
Which shapes make up the proximal surfaces of the teeth?
Anteriors: triangular
Max posterior: trapezoidal
Mand posterior: rhomboidal
All facial HOC’s are located in the cervical third, except __________.
mandibular molars (junction of cervical and middle third)
Where is the lingual HOC on anterior teeth?
Cervical third at the cingulum
Lingual HOC of posterior teeth are located in the middle third except __________.
mandibular PM2 - occlusal third
Which teeth will have the maximum height of proximal CEJ contour?
Anteriors
The mesial CEJ contour is always _______ than the distal contour.
greater
Incisors and canines have _____ lobes.
four: 3 labial mamelons, 1 lingual cingulum
Which is the only premolar that does not have four lobes (3 buccal, 1 lingual)?
Mand PM2 (3 buccal, 2 lingual)
T/F: Second molars have more lobes than first molars.
False
First molars have 5 lobes, seconds have 4 lobes
T/F: The mandibular arch is slightly longer than the maxillary.
False
Max is slightly longer
