Introduction to Oral Anatomy and Nomenclature

Flashcards based on the Oral Anatomy Lecture covering dentition cycles, tooth structures, morphology, numbering systems, and anatomical landmarks.

At what point in utero does the primary dentition begin to form?

At about $6$ weeks in utero.

What is the mean age at which primary teeth begin to appear in the oral cavity?

$6$ months.

The completed primary dentition consists of how many teeth?

$20$ teeth.

What is the name for the period where both deciduous and succedaneous teeth are present?

Mixed Dentition.

Which term describes permanent teeth that replace or succeed primary teeth?

Succedaneous teeth.

Which permanent teeth are considered non-succedaneous because they do not replace primary teeth?

Permanent molars.

At what age does the mixed dentition period usually begin?

$6$ years of age.

What is the colloquial name for the mixed dentition stage?

Ugly Duckling stage.

The completed permanent dentition consists of how many teeth?

$32$ teeth.

What is the hardest substance in the human body, serving as the protective external layer of the anatomic crown?

Enamel.

What is the mineral composition of enamel?

$95\%$ calcium hydroxyapatite.

What name is given to the hard mineralized tissue underlying the enamel and cementum?

Dentin.

What are the specialized cells that form cementum?

Cementoblasts.

What are the two specific portions of the pulp cavity?

The coronal portion (pulp chamber) and the root portion (pulp canal).

Which term refers specifically to the amount of tooth visible in the oral cavity?

Clinical crown.

What line separates the anatomic crown from the anatomic root?

Cervical Line (also known as the CEJ).

What is the terminal end of the root portion of a tooth called?

Apex.

How is the division of the root in multirooted teeth described?

Furcation (either bifurcation or trifurcation).

In the Universal Notation System, how are the teeth of the primary dentition identified?

Using upper case letters.

Which tooth surface is directed toward the cheeks?

Buccal Surface.

Which tooth surface is directed toward the midline of the dental arch?

Mesial Surface.

What is a cingulum?

The lingual lobe of an anterior tooth that makes up the bulk of the cervical third of the lingual surface.

What is the definition of a transverse ridge?

The union of two triangular ridges.

What are mamelons?

Any of the $3$ protuberances found on the incisal ridges of newly erupted incisor teeth.

What is the narrow cleft or crevice at the depth of a groove, caused by incomplete enamel fusion, where decay often begins?

Fissure.

What is the junction of three tooth surfaces called?

Point Angle.

What term describes the space between two adjacent teeth in the same arch that is not caused by a missing tooth?

Diastema.

What purpose do embrasures serve in the mouth?

They serve as spillways to direct food away from the gingiva.