Dental Pedo Eruption Sequence
Understanding the sequence and timing of primary tooth eruption is crucial for monitoring a child's dental development.
Primary Tooth Eruption
1
First Tooth
The first primary tooth usually erupts around 6-12 months of age, often the lower central incisors.
2
Complete Dentition
By the age of 2-3 years, a child's full set of 20 primary teeth should have erupted.
3
Shedding Begins
Around age 6, the primary teeth begin to shed to make way for the permanent dentition.
Eruption Chronology
Mandibular Teeth
Lower central incisors (6-12 months), lateral incisors (10-16 months), first molars (12-18 months), canines (16-22 months), second molars (20-30 months).
Maxillary Teeth
Upper central incisors (8-12 months), lateral incisors (9-13 months), first molars (13-19 months), canines (16-22 months), second molars (20-30 months).
Eruption Pattern
Teeth generally erupt in pairs, with the mandibular teeth preceding the maxillary teeth by a few months.
Factors Affecting Eruption
1
Genetics
Genetic factors can influence the timing and sequence of tooth eruption.
2
Nutrition
Nutritional deficiencies, such as vitamin D, can delay tooth eruption.
3
Health Conditions
Certain medical conditions, like endocrine disorders, can affect the eruption process.
4
Local Factors
Trauma, cysts, or crowding in the dental arch can also impact tooth eruption.
Developmental Milestones
Key Eruption Milestones
By 12 months: First 4 teeth (lower and upper central incisors)
By 24 months: Complete set of 20 primary teeth
By 6 years: First permanent molars erupt
By 24 months: Complete set of 20 primary teeth
By 6 years: First permanent molars erupt
Variations in Eruption Timing
- Early eruption: can occur as early as 3-4 months
- Late eruption: may be delayed up to 18 months
- Asymmetric eruption: one side may precede the other
Dental Arch Changes
1
Dental Arch Expansion
As primary teeth erupt, the dental arches expand to accommodate the growing dentition.
2
Spacing and Crowding
Spacing between primary teeth is normal, but crowding may occur as the permanent teeth begin to erupt.
3
Arch Shape Changes
The dental arches evolve from a more rounded shape in infancy to a more U-shaped form by early childhood.
Eruption Abnormalities
Delayed Eruption
Teeth that fail to erupt by the expected time may indicate an underlying medical condition.
Ectopic Eruption
When a tooth erupts in an abnormal position, often causing problems with adjacent teeth.
Impaction
A tooth that is unable to fully erupt due to lack of space or obstruction.
Supernumerary Teeth
Extra teeth that develop in addition to the normal set, which may cause crowding.
Importance of Monitoring
