Dental Anatomy- Chapter 11

Dentition

the natural teeth in the jawbones

how many dentitions do we have

3- primary, mixed, permanent

primary dentition

The first set of 20 primary teeth; also known as deciduous or baby teeth

Mixed dentition

A mixture of permanent teeth and primary teeth that occurs until all primary teeth have been lost, usually between the ages of 6 and 12.

permanent dentition

consists of 32 teeth that are designed to last a lifetime

how many dental arches are there?

2; maxillary and mandibular

maxillary arch

upper jaw; part of the skull; is fixed and not capabale of movement

mandibular arch

lower jaw; is capable of movement

occlusion

is the natural position while biting

How many quadrants are there?

4 quadrants

How many sextants are there?

6

what teeth are the anterior teeth?

incisors and canines

How many anterior teeth are in the permanent dentition?

12

What are the posterior teeth?

premolars and molars

how many types of teeth is the permanent dentition divided into?

4; incisiors, canines, premolars, molars

how many types of teeth is the primary dentition divided into?

3; incisiors, canines, molars

what does the permanent dentition have that the primary doesn't?

premolars

How many incisors are there?

8: for cutting like scissors

How many canines are there?

4: for tearing

How many premolars are there?

8

How many molars are there?

12; to chew and grind food

How many surfaces does each tooth have?

5

facial/ labial

structures closest to the facial surface or lips

lingual/ palatal

inner most surface toward the tongue or palate

Occlusal

Chewing surface of posterior teeth

Mesial

Surface of the tooth toward the midline

Distal

surface of the tooth away from the midline

Proximal

contact/ inbetween

Buccal

cheek area

Incisal

Biting edge of anterior teeth

contact area

Area of the mesial or distal surface of a tooth that touches the adjacent tooth in the same arch

Height of contour

bulge or widest point on a specific surface of the crown

Embrasure

Triangular space in a gingival direction between the proximal surfaces of two adjoining teeth in contact.

line angle

formed by the junction of two surfaces

point angle

Angle formed by the junction of three surfaces

Centric occlusion

occurs when the jaws are closed in a position that produces maximal stable contact between the occluding surfaces of the maxillary and mandibular teeth

Functional occlusion

Contact of the teeth during biting and chewing movements

Malocclusion

abnormal contact between the teeth

Closure

anterior teeth are not designed to fully support the occlusal forces on the entire dental arch

Curve of Spee

Occlusal surfaces of the posterior teeth do not form a flat plane

Universal National System

Numbering system (1-32 for the permanent teeth and 1-20 for the primary teeth) that begins with the maxillary right and concludes at the mandibular right

how many tooth numbering systems are there?

3; we use universal national system

How many teeth are in the primary dentition?

20

how many teeth are in the permanent dentition?

32 teeth

How many nonsuccedaneous teeth are there in the adult dentition?

12 teeth; 3 molars on each side of the mouth

Succedaneous

Permanent teeth that replace primary teeth

Nonsuccedaneous

Permanent teeth without primary predecessors, namely the molars