Primary Dentition and Tooth Eruption Flashcards
What teeth are found in each quadrant of the deciduous dentition
2 incisors
1 canine
2 molars
Describe the shapes of the crowns and roots of upper right central incisors
- Acute angle mesially
- Smooth curve distally
- Convex cingulum
- Concave lingual fossa
- Oval to circular root
Describe the shapes of the crowns and roots of lower right central incisors
- Mesially forms obtuse angle from apex of root to crown
- Distally = straight line from apex of root to crown
- Slightly convex cingulum
- Slightly concave lingual fossa
- Flattened oval root
Describe the shapes of the crowns and roots of deciduous upper right central incisors (A’s)
- Mesial right angle on crown
- Distal smooth curve on crown
- Convex cingulum
- Shallow lingual fossa
- mesiodistal length greater than crown height
- Oval root
Describe the shapes of the crowns and roots of deciduous lower right central incisors (A’s)
- Mesial and distal = obtuse angle from apex of root to crown, distal = more obtuse
- Convex cingulum
- Slightly concave lingual fossa
- Slight labial bulge
- Flattened oval root
Describe the shapes of the crowns and roots of deciduous upper right lateral incisors (B’s)
- Mesial acute angle on crown
- Distal smooth curve on crown
- Convex cingulum
- Concave lingual fossa
- Labial bulge
- Flattened root
Describe the shapes of the crowns and roots of deciduous lower right lateral incisors (B’s)
- Mesial acute angle on crown
- Distal smooth curve on crown
- Mesial and distal obtuse angle from apex of root to crown
- Crown rotated towards canine
- convex cingulum
- Shallow lingual fossa
- Circular root
Describe the shapes of the crowns and roots of upper right canines
- slightly convex crown mesially
- markedly convex crown distally
- Mesial slope shorter than distal slope, on crown
- convex cingulum
- Slightly concave fossa
- Wide buccal/lingual dimensions
Describe the shapes of the crowns and roots of lower right canines
- crown and root in a straight line
- markedly convex
- mesial slope shorter than distal
- slightly concave lingual fossa
Describe the shapes of the crowns and roots of deciduous upper right canines
- Short convex cervial curve mesially
- Long convex curve distally
- Mesial slope longer than distal
- Convex cingulum
- Shallow lingual fossa
- Curved triangular root
Describe the shapes of the crowns and roots of deciduous lower right canines
- Slightly convex mesially
- convex distally
- Mesial slope shorter than distal
- Convex cingulum
- Shallow lingual fossa
- Curved triangular root
When do the permanent and deciduous dentition develop relative to each other
They develop simultaneously
Where do teeth develop within
Alveolar bone
What happens to deciduous teeth before they are replaced with permanent teeth
Root resorption
Exfoliation (loss)
What is classified as clinical emergence of teeth
When the tooth is visible in the oral cavity
Describe what tooth eruption is
A process of tooth movement from within alveolar bone up to functional occlusion
What are the 5 stages of passive and active eruption stages
- Pre-eruptive movement
- Intra-osseus
- Mucosal penetration
- Pre-occlusal
- Post-occlusal movement
Describe the active stages of tooth eruption
- Intra-osseus - tooth in alveolar bone, alveolar eruption
- Mucosal penetration - clinical/gingival emergence
- Pre-occlusal - prior to reaching functional occlusion
What is the dental follicle
A sac containing the developing tooth and its odontogenic organ.
What does the dental follicle differentiate into
The periodontal ligament
Roughly when does the first permanent tooth erupt
around 6 years
Roughly when does the last of the first 28 permanent teeth erupt
around 13 years
Roughly in what order do deciduous teeth erupt
- Lower central and lateral incisors, upper central and lateral incisors (6-12 months)
- Eruption of first molars (14 months)
- Eruption of canines (18 months)
- Eruption of second molars (24 months)
What are the different stages of developing dentition
- before any teeth have erupted
- deciduous dentition
- mixed dentition (early)
- mixed dentition (ugly duckling)
- permanent dentition
Roughly in what order do permanent teeth erupt
- lower central incisors and lower 1st molars (6yrs)
- lower lateral incisors and upper central incisors (7yrs)
- upper lateral incisors (8yrs)
- pre molars (10-11yrs)
- canines and 2nd molars (11-12yrs)
- 3rd molars (16-20yrs)
How do permanent mandibular incisors erupt relative to deciduous incisors
lingually
What is active and passive eruption
Active eruption - movement of the tooth
Passive eruption - exposure of the crown by migration of the gingival attachment
When do the first and last teeth of deciduous dentition erupt
1st - 6months ish
last = 2.5 yrs each
When do permanent teeth begin to erupt relative to root growth
Permanent teeth begins to erupt during early root growth
