Anatomy of Primary Dentition Flashcards
Why are primary teeth important? 5 reasons.
- Need for mastication
- Support cheeks and lips
- Need for speech
- Guide permanent teeth
- Need as space maintainers
Do caries progress faster in primary or permanent teeth?
Primary
Early exfoliation or extraction of primary teeth may lead to…
Orthodontic problems because baby teeth are “space maintainers”
What type of teeth are not included in the primary dentition?
Premolars
From what ages do you expect to find a primary dentition?
6 months to 6 years old
From what ages do you expect to find a mixed dentition?
6 years to 12 years old
What does exfoliation mean?
Primary teeth are being lost
What does succedaneous mean?
Teeth that replace primary teeth
What teeth are nonsuccedaneous?
Permanent molars
From what ages do you expect to find a adult dentition?
After age 12
What permanent teeth replace primary molars?
Premolars
How are primary teeth labeled in the universal notation?
Letters A-T
What is the acronym to remember the second primary molars letters?
Apple Juice Kills Teeth
What is the acronym to remember first primary molar letters?
BILS, pay your bills first
How are primary enumerated teeth labeled?
By adding an “S” to the end of the most adjacent tooth
How are permanent enumerated teeth labeled?
By adding 50 to the number of the most adjacent tooth
How are primary teeth labeled in the palmer numbering system?
Using A-E and symbol for each quad
Do primary or permanent teeth tend to have more consistent shapes and fewer anomalies?
Primary
The primary incisors and canines are _______ mesio-distally than the permanent dentition.
Narrower
The primary molars are _______ mesio-distally than the permanent dentition.
Wider
What is the space mesial to maxillary canines and distal to the mandibular canines?
Primate space
What is the CDE segment that is wider mesio-distally than the 3-4-5 mesio-distal width?
Leeway space
What is the ideal spacing between primary teeth called?
Baume Type 1
What is the limited/no spacing between primary teeth called?
Baume Type 2
Do girls or boys teeth tend to come in first?
Girls
Teeth tend to erupt in…
Pairs
Do mandibular or maxillary teeth erupt first typically?
Mandibular
What color are primary teeth?
Bluish white tint
What color are permanent teeth?
Tend to be more yellow/gray compared to baby teeth
What is the overall shape of primary teeth?
Small and bulbous crowns with sharp constriction cervically
Primary teeth have a sharp inclination in what direction?
Sharp lingual inclination occlusually
The roots are more slender and tapering and longer in proportion to the crown in what teeth?
Primary teeth
What is the purpose of diverging roots of primary teeth?
So adult teeth can follow
What is the pulp anatomy of primary teeth?
Pulp outline follows the DEH more closely than permanent teeth
Is the pulp larger or smaller in primary teeth?
Larger
Is the pulp closer or farther from the enamel surface in primary teeth?
Closer
Is the microscopic structure of the tissues of primary teeth the same as permanent teeth?
Yes
When does primary teeth development start?
Prenatal life
When does the formation of enamel and dentin of permanent teeth occur?
Postnatal life
How is the enamel surface situated in reference to the DEJ?
Enamel surface is parallel to the DEJ
What is the thickness of primary enamel?
Primary enamel is half the thickness of permanent teeth
What is attrition?
Tooth wear from tooth-to-tooth contact
What causes attrition in primary teeth?
Less mineralized enamel
What shape overall are primary anterior teeth?
Square
Are there mamelons on primary teeth?
No
What are the two characteristics of primary anterior roots?
- Longer and narrower roots
- Root bends 10 degrees labially
Are primary central incisors wider mesio-distally or incisally-cervically?
Mesio-distally
Are primary lateral incisors wider mesio-distally or incisally-cervically?
Incisally-cervically
What shape are primary canines?
Pentagon
Is the mesial cusp ridge longer or shorter than the distal cusp ridge of a primary canine?
Mesial cusp ridge is longer
What shape contact areas do primary molars have?
Broad and flat contact areas
Are primary maxillary molars wider bucco-lingually or mesio-distally?
Bucco-lingually
Are primary mandibular molars wider bucco-lingually or mesio-distally?
Mesio-distally
Why are the first primary molars unique?
They can be infected easily
Are the primary molars smaller or bigger than their permanent successors (premolars)?
Larger
What primary tooth has the highest failure rate for class II restorations?
Mandibular first primary molars
How many cusps do the mandibular first primary molars have?
4
How many cusps do the maxillary first primary molars have?
3
How many roots do the maxillary first primary molars have?
3
How many roots do the maxillary second primary molars have?
3
