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Dental Anatomy

NBDE 1

TermDefinition
Morphology Homodont dentition All teeth have the same morphology
Morphology Heterodont dentition Teeth have different morphology (eg, humans).
Monophyodont dentition One set of teeth
Diphyodont dentition Two sets of teeth (eg, humans).
Polyphyodont dentition Multiple sets of teeth.
Anterior teeth Incisors and canines. 12 total (6 per arch).
Posterior teeth: Premolars and molars. 20 total (10 per arch).
Anatomic crown The portion of the tooth that extends from the cementoenamel junction (CEJ) to the incisal edge or occlusal surface (enamel covered portion of the tooth).
Clinical crown The portion of the tooth that extends incisally or occlusally from the gingival margin (clinically visible portion of the tooth).
Incisal edge The chewing surface of anterior teeth
Occlusal surface The chewing surface of posterior teeth consisting of cusps, ridges, and grooves.
Occlusal table The occlusal surface within the cusp and marginal ridges.
Lobe The primary center of enamel formation in a tooth
lobes are represented by cusps, mamelons, and cingula
Lobe are separated by developmental depressions (anterior teeth) or developmental grooves (posterior teeth).
Mamelon A round extension of enamel
Where is the Mamelon? on the incisal edge of all incisors.
How many Mamelon per incisor? three mamelons per incisor (one for each facial lobe)
What is the mamelon often? They are often translucent because of a lack of underlying dentin
Mamelon worn down by? by attrition and mastication;
Mamelon presence in adults is an indication of malocclusion.
Cingulum A bulbous convexity of enamel
Cingulum located on the cervical third of the lingual surface of all anterior teeth.
Cusp A large elevation of enamel
Cusps located on the occlusal surface of all posterior teeth
who is the interior tooth that has Cusps? and the incisal edge of canines.
Tubercle An extra formation of enamel on the crown of a tooth
Tubercle Often manifests as a supernumerary cusp such as the cusp of Carabelli.
Ridge A linear elevation on the enamel surface.
Marginal ridge A ridge on all teeth that
What marginal ridge form and where? forms the mesial and distal margins of posterior occlusal surfaces and anterior lingual surfaces
Labial ridge only only on canines
Labial ridge prominent prominent in maxillary canines
Buccal (cusp) ridge only only on premolars
Buccal (cusp) ridge prominent More prominent in first premolars
Cervical ridge on all primary teeth and permanent molars
Cervical ridge where in the cervical third of the buccal surface of the crown.
Oblique ridge on all maxillary molars
oblique ridge extended from the ML to DB cusps (it separates the MB and DL cusps).
Triangular ridge on all posterior teeth that extends from the cusp tip to the central groove
who has two triangular ridge The ML cusp of all maxillary molars has two triangular
Transverse ridge on most posterior teeth
Transverse ridge most common on maxillary premolars and mandibular molars.
Sulcus A V-shaped depression on the occlusal surface of posterior teeth between ridges and cusps.
Fossa An irregularly shaped depression in the enamel surface.
Developmental groove A well-defined, shallow, linear depression in enamel that separates the cusps, lobes, and marginal ridges of a tooth.
Fissure A narrow crevice at the deepest portion of the developmental groove in enamel
Pit A small pinpoint concavity at the termination or junction of developmental grooves.
Supplemental groove short groove auxiliary to a developmental groove that does not separate major tooth parts.
Caries are most likley to occur in pits, fissure, groove.
Created by: Joseph.Shahin