Primary teeth begin eruption at around 6 months and Permanent teeth at around 6 years. In general, lower tooth erupts before it’s upper counterpart with few exceptions (lower before upper rule). Age of 6-12 years is a period of mixed dentition (eruption of permanent 1st molar to eruption of 2nd permanent molar).
Primary (Temporary Teeth)
Rules and Exceptions:
- Eruption progresses from medial to lateral except canines which erupt between 1st and 2nd molar.
- Incisors erupt in clockwise fashion at a difference of 2 months starting from lower central incisor.
- Lower and upper canines and molar at around similar time.
- 2-4-6 rule for canines and molars.
Eruption:
- Lower central incisor: 6 months
- Upper central incisor: 8 months
- Upper lateral incisor: 10 months
- Lower lateral incisor: 12 months
- 1st molars: 12 months + 2 = 14 months
- Canines: 14 months + 4 = 18 months
- 2nd molars: 18 months + 6 = 24 months
Secondary (Permanent) Teeth
Rules and Exceptions:
- Sequence: Mama Is In Pain, Papa Can Make Medicine, i.e. 1st molar, 1st Incisor, 2nd Incisor, 1st Premolar, 2nd Premolar, Canine, 2nd Molar, 3rd Molar
- Eruption occurs sequentially at a difference of 1 year except the 3rd molar which erupts between 18-24 years.
- Lower teeth appears few months earlier with exception of the lower canines which erupts almost 2 years earlier, i.e. 9 years.
- Premolars appear earlier in upper jaw, i.e. lower 1st premolar would appear at 10 years and lower 2nd premolar would appear at 11 years.
- Add 3 years to the age of eruption for the age of completion of calcification.
Eruption:
- 1st molar: 6 years
- 1st incisor: 7 years
- 2nd incisor: 8 years
- 1st premolar: 9 years
- 2nd premolar: 10 years
- canine: 11 years
- 2nd molar: 12 years
- 3rd molar: 18-24 years
Awesome pneumonic loved it.
Can you tell me from which book has this image been taken from? I used to study from its pdf but can’t remember the name pf the book.
Source: APC Textbook of Forensic Medicine and Toxicology By Anil Aggrawal