Ch.11 Dentition

How many dentitions do humans have in a lifetime?

Two

• Primary (baby teeth)

• Permanent (adult teeth)

What are the three dentition periods?

Primary, Mixed, Permanent

How many teeth are in the primary dentition?

20 teeth (10 upper, 10 lower)

How many teeth are in the primary dentition?

32 teeth (including 3rd molars)

What age range is mixed dentition period?

Approx, 6-12 years old

What tooth usually erupts first in the mixed dentition?

Permanent mandibular first molar

Maxillary arch

• Upper

• Fixed in skull

Mandibular arch

• Lower

• Moveable with TMJ

What is occlusion?

Contact of the maxillary and mandibular teeth when jaws close

How many quadrants are there in the mouth?

4 quadrants

How many teeth are in each permanent quadrant?

8

How many teeth in each primary quadrant?

5

How many sextants are in the mouth?

6

Which teeth are in the anterior sextants?

Incisors + Canines

Which teeth are in the posterior sextants?

Premolars + Molars

What are the four types of teeth?

• Incisors

• Canines

• Premolars

• Molars

Function of incisors?

Cut food

Function of canines?

Tear food

Function of premolars?

Crush and grind

Function of molars?

Chew with force, grind

Facial surface = ?

Labial (front teeth) or Buccal (back teeth)

Lingual surface = ?

Surface facing tongue

Palatal surface = ?

Lingual surface of maxillary teeth

Masticatory surfaces = ?

• Incisal (anterior)

• Occlusal (posterior)

Mesial surface = ?

Toward the midline

Distal surface = ?

Away from the midline

Proximal surfaces = ?

Mesial and distal surfaces between adjacent teeth

Interproximal space = ?

Space between two teeth

Contact area = ?

Spot where two teeth touch side by side

Embrasure = ?

Triangular space around contact area

What are the divisions of the root?

• Apical

• Middle

• Cervical

What are the divisions of a crown?

• Occlusocervical

• Mesiodistal

• Buccolingual

What is a Class I occlusion?

Normal molar relationship

What is a Class II occlusion?

Mandibular teeth positioned back relative to maxillary

What is an Class III occlusion?

Mandibular teeth positioned forward relative to maxillary

Difference between Class II Division 1 and 2?

• Division 1 = Upper incisors protrude

• Division 2 = Upper incisors retrude

What is the Curve of Speed?

Curve front to back

What numbering system uses 1-32 and A-T?

Universal

• 1-32 = Permanent

• A-T = Primary

What numbering system uses two-digit codes (quadrant + tooth)?

ISO/FDI

What numbering system uses brackets with numbers/letters?

Palmer Notation