DH 105 - Primary (and Mixed) Dentition

What is another name for primary teeth?

Deciduous teeth

The 20 permanent teeth that replace or succeed their primary teeth predecessors are called...

Succedaneous teeth

The 12 molars have no predecessors and are therefore called...

Non-succedaneous teeth

Aside from the function of chewing food, what are other important functions of the primary dentition?

1. Support lips and cheeks

2. Reserving space for the permanent teeth in proper alignment

3. Formulations of speech

What are the 4 time period of tooth development?

1. Edentulous (no teeth): birth - 6 months

2. Primary dentition: 6 months - 6 years

3. Mixed dentition: 6 years - 12 years

4. Permanent dentition: 12+ years

When do crowns begin to calcify and complete calcification?

Begin: 4-6 months in utero

Complete: first year after being born

What time frame do primary teeth erupt?

6-30 months

What is the order of eruption?

Mandibular centrals

Maxillary centrals

Maxillary laterals

Mandibular laterals

Primary first molars

Canines

Primary second molars

What are the last primary teeth to erupt?

Primary maxillary second molars

Primary root formation is completed between _____ and _____.

18 months; 3 years

The combined mesiodistal arch space occupied by the primary canines and molars in each quadrant is greater than that occupied by the permanent canines and premolars. The difference in space is called...

Leeway space

As the bones grow, spaces created between the anterior teeth is called...

Primate space

Where are you most likely to see primate spaces?

Mesial to the maxillary canines, and distal to the mandibular canines

A gradual breakdown of the primary roots to allow for eruption of the permanent crowns is called...

Root resorption

The process of shedding teeth is called?

Exfoliation

What is the timeframe for permanent crown formation?

Begins at birth and continues to about age 16

Where do primary teeth constrict more?

At the CEJ

Do primary incisors have mamelons?

No

Roots of primary teeth are _____ in proportion to their crown.

Longer

The anterior teeth roots bend _____.

Labially

- This is to allow space for the developing succedaneous incisors.

What is unique about the primary maxillary canines?

The mesial cusp ridge is longer than the distal cusp ridge

Primary second molars are _____ compared to primary first molars.

Larger

Which tooth is wider, the primary second molar or the second premolar that replaces it?

Primary second molar

Describe the roots of primary molars.

Primary molar roots are thin, little to no root trunk, and spread out beyond the outlines of the crown.

- This makes room for the developing succedaneous premolar teeth.

How many roots do primary molars have?

Primary maxillary molars: 3

Primary mandibular molars: 2

How many cusps does a primary mandibular second molar have? What permanent mandibular molar is similar to this?

5 cusps; similar to the permanent mandibular first molar

How many cusps does a primary maxillary second molar have? What permanent maxillary molar is similar to this?

4 major cusps and often a 5th Cusp of Carabelli; similar to the permanent maxillary first molar

Which primary maxillary crown is unique in appearance?

Primary maxillary first molar

How does a primary maxillary first molar resemble a maxillary first premolar?

Although it has 4 cusps, it only has 2 larger cusps giving it the appearance of a premolar

Which primary tooth does not resemble any other tooth?

Primary mandibular first molars

Where is most of the pulp chamber on primary molar teeth?

In the crown because they have very small root trunks