Dental Anatomy: Introduction and Terminology

Labial Ridge = Facial surfaces of canines Lingual Ridge = Lingual surfaces of canines Marginal Ridge = Mesial and distal margins of the lingual surface of anterior teeth Triangular Ridge = Center of the occlusal surface of posterior teeth

Buccal Ridge = Results from overdevelopment of the middle buccal lobe Incisal Ridge = Transformed into edge by attrition Transverse Ridge = Connects two triangular ridges of two opposing cusps, found in lower premolars Oblique Ridge = Connects two triangular ridges of two non-opposing cusps, crosses the occlusal surface obliquely, found in upper molars

Cervical Ridge = Located in facial surfaces at the cervical 1/3 of all teeth Marginal Ridge = Found on the mesial and distal margins of the occlusal surface of posterior teeth Cusp Ridge = Forms an angle at the cusp tip when viewed from the facial and lingual aspect, may also be called cusp slopes or cusp arms Triangular Ridge = Descends from any cusp tip to the center of the occlusal surface of posterior teeth

<p>Labial Ridge = Canines Marginal Ridge on Lingual Surface = Anterior teeth Transverse Ridge = Lower premolars Oblique Ridge = Upper molars</p> Signup and view all the answers

<p>Incisal Ridge = Transformed into edge by attrition Triangular Ridge = Descends to the center of the occlusal surface of posterior teeth Cusp Ridge = Forms an angle at the cusp tip when viewed from facial and lingual aspect Marginal Ridge on Lingual Surface = Found on mesial and distal margins of anterior teeth</p> Signup and view all the answers

<p>Buccal Ridge - Labial Ridge = Overdevelopment of middle labial lobe in canines and buccal lobe in premolars Lingual Ridge - Marginal Ridge on Lingual Surface = Mesial and distal margins on lingual surfaces Transverse Ridge - Oblique Ridge = Connecting two triangular ridges in different types of teeth Cervical Ridge - Triangular Ridge = Found at cervical 1/3 in facial surfaces and descends to center of occlusal surface</p> Signup and view all the answers

<p>Mamelons = Three small round projections of enamel present in the incisal third of newly erupted incisors Cingulum = Enlargement or bulge on the cervical third of lingual surface of the crown in anterior teeth Cusps = Elevation of various shape &amp; size present on the Incisal portion of canine and the occlusal surface of posterior teeth Tubercle = Small elevation produced by excessive formation of enamel</p> Signup and view all the answers

<p>Lobe = Primary centers of calcification and growth formed during the crown development, can be three, four, or five in number Ridge = Linear elevated structure on the crown surface Pulp Horns = Extensions of pulp chamber corresponding to lobes formed during crown development Linear Circumscribed = Type of depression on the crown surface</p> Signup and view all the answers

<p>Cervical Lingual Middle Buccal = Middle third Mesial Middle Distal = Thirds division Incisal &amp; Occlusal Lingual Middle Buccal = Incisal portion and occlusal surface Cervical Middle Apical Distal half Mesial half Buccal half Lingual half = Cervical, middle, and apical divisions</p> Signup and view all the answers

<p>Mamelons = Projections on incisal third of incisors representing labial lobes Tubercle = Small elevation made of excessive enamel formation Cusps = Elevations present on canine's incisal portion and posterior teeth's occlusal surface Ridge = Linear elevated structure on crown surface</p> Signup and view all the answers

<p>Crown Elevations = Primary centers of calcification and growth during crown development, can vary in number Depressions = Concave areas on the crown surface Socket and Crypt = Regions where roots are embedded in the jawbone Elevations Lobe Tubercle Ridge = Different types of elevations present on teeth</p> Signup and view all the answers

<p>Distal half Mesial half Buccal half Lingual half = Half divisions along different surfaces of the tooth Apical Distal half Mesial half Buccal half Lingual half = Location-based divisions within a tooth</p> Signup and view all the answers

<p>Fissures = Linear depression found in the bottom of the developmental groove Sulcus = Broad depression or valley on the occlusal surfaces of posterior teeth Fossa = Small depression found in both anterior and posterior teeth Pits = Pinpoint depression present at the junction or at the ends of the developmental grooves</p> Signup and view all the answers

<p>Lingual fossa = Found on the lingual surface of anterior teeth Mesial &amp; distal triangular fossa = Found on the occlusal surfaces of posterior teeth mesial and distal to the marginal ridges Central fossa = Found on the occlusal surface of molars True pit = Present in the bottom of central, mesial and distal triangular fossae</p> Signup and view all the answers

<p>Crown Depressions = Denoting union of lobes, found on occlusal surface and may extend to buccal and lingual surfaces of posterior teeth Supplemental grooves = Small irregular branches of developmental grooves, found on occlusal surfaces of third molar and second premolar Developmental grooves = Result from incomplete union of primary lobes, incomplete enamel formation Circumscribed depressions = Linear depression, not denote union of lobes</p> Signup and view all the answers

<p>Linear depression Circumscribed depressions = Found on the occlusal surface and may extend to the buccal and lingual surfaces of posterior teeth Fossa Mesial &amp;distal fossae = Found on the occlusal surfaces of posterior teeth mesial and distal to the marginal ridges Central fossa pit = Present in the bottom of central fossa Mesial &amp;distal triangular fossa Circumscribed depressions = Found on the occlusal surfaces of posterior teeth mesial and distal to the marginal ridges</p> Signup and view all the answers

<p>Denoting union of lobes Found on the occlusal surface and may extend to the buccal and lingual surfaces of posterior teeth = Crown Depressions It results from incomplete union of primary lobes (incomplete enamel formation) = Fissures It is a broad depression or valley on the occlusal surfaces of posterior teeth = Sulcus It is a small depression found in both anterior and posterior teeth = Fossa</p> Signup and view all the answers

<p>Central pit = Pinpoint depression present at the junction or at the ends of developmental grooves Mesial &amp; distal pits = Pinpoint depression found at the bottom of mesial and distal triangular fossa Lingual fossa = Small depression found on lingual surface of anterior teeth Central fossa pit True pit = Present in bottom of central, mesial, and distal triangular fossae</p> Signup and view all the answers