Oral Anatomy (Prelims)

Mesial and distal aspect of anterior teeth.

Triangle

Buccal & lingual aspect of all teeth, and mesial & distal aspect of upper premolars and molars.

Trapezoid

Mesial & distal aspects of lower premolars and molars.

Rhomboid

Investing, supporting, attachment and covering system of teeth.

Periodontium

Gingiva & Periodontal Ligament

Soft Tissues

Alveolar bone & Cementum

Hard Tissues

Junctions of middle thirds and it prevents food impaction

Proximal Contact Areas

Triangular shaped areas filled with gingival tissues

Interproximal Spaces

Spillway for food material during mastication and enhances self cleansing process of tooth.

Embrasures

Increase in size anterior to posterior

Incisal or Occlusal Embrasures

Decrease in size anterior to posterior

Cervical Embrasures

True or False: Lingual embrasures are wider than facial embrasures.

True

Stable line whose curvature is related to the widths and lengths of the crown.

Curvature of the Cervical Line (CEJ)

Anteroposterior Direction and the alignment of the cusp tips of the posterior teeth.

Curve of Spee

Mediolateral curve or frontal view, created by the lingual inclination of posterior teeth.

Curve of Wilson

• Pointed elevation or mound of the crown

• Divisional part of occlusal surface

Cusp

Smaller elevation of some portion of the crown.

Tubercle

• Located in the lingual surface of anterior teeth.

• Resembles a gridle encircling the lingual surface at the cervical third.

Cingulum

Any linear elevation on the surface of the tooth.

Ridge

• Cervicoincisal prominence across the labial surface of canines.

• More distinct in maxillary canines.

Labial Ridge

• Rounded borders of enamel that form the mesial and distal margins.

• Occlusal surfaces of posterior teeth and lingual surface of anterior teeth.

Marginal ridge

Descend from the cusp tip of molars and premolars toward the central part of the occlusal surfaces.

Triangular ridge

Union of buccal and a lingual triangular ridge crossing transversely on occlusal surfaces.

Transverse ridge

Ridge crossing obliquely the occlusal surfaces of posterior of maxillary molars.

Oblique ridge

Irregular depression or concavity

Fossa

Located on the lingual surface of incisors

Lingual fossa

Located on the occlusal surfaces of posterior of molars.

Central fossa

• Adjacent to marginal ridges.

• Found on occlusal surfaces of posterior of molars and premolars.

Triangular fossa

• Long depression or valley.

• Seen between ridges and cusp.

Sulcus

Shallow groove or line between primary parts of crown.

Developmental groove

• Less distinct

• Also shallow linear depression on the surface of tooth.

Supplemental groove

Small pinpoint depressions located at the junction of developmental grooves or at terminal of those grooves.

Pits

• Three rounded protuberances found on the incisal ridges of newly erupted incisor teeth.

• Baby teeth.

Mamelons

One of the primary sections os formation in the development of the crown.

Lobe

Primary dentition eruption sequence:

A-B-D-C-E

Primary mandibular central incisor eruption

6-10 months

Primary mandibular lateral incisor eruption

10-16 months

Primary mandibular canine eruption

17-23 months

Primary mandibular first molar eruption

14-18 months

Primary mandibular second molar eruption

23-31 months

Primary maxillary central incisor eruption

8-12 months

Primary maxillary lateral incisor eruption

9-13 months

Primary maxillary canine eruption

16-22 months

Primary maxillary first molar eruption

13-19 months

Primary maxillary second molar eruption

25-33 months