Chronology Flashcards
What are the four main stages of human dentition development?
- Edentulous stage (birth to 6/8 months) 2. Primary dentition stage (6 months to 6 years) 3. Mixed dentition stage (6 to 12 years) 4. Permanent dentition stage (+12 years).
What is the ‘gappy tooth stage’?
It occurs during the mixed dentition stage due to shedding of primary teeth, resulting in spaces and gaps.
What is the timing for primary teeth eruption?
6 months to 2.5 years, starting with mandibular central incisors.
When do the first molars and incisors erupt during the mixed dentition stage?
During Phase 1 (6-9 years).
What happens during Phase 2 of the mixed dentition stage?
Eruption of canines, premolars, and second molars (9-12 years).
What is dental age estimation?
Estimating age by assessing tooth development, often used when chronological age is unknown.
When is the first indication of tooth development?
At 6 weeks of prenatal life.
What happens after a tooth emerges through the gingiva?
Three-fourths (3/4) of the root is formed, and root completion takes 1.5 years for primary teeth.
What is the sequence of primary teeth emergence?
Man. CI → Max. CI → Both LI → Both 1st Molars → Both Canines → Both 2nd Molars.
When does calcification of primary dentition occur?
Between 14-19 weeks post-fertilization.
What are natal and neonatal teeth?
Natal teeth are present at birth, and neonatal teeth appear within the first month of life.
What are some problems associated with early tooth emergence?
Nursing difficulty, ulceration, and risk of aspiration due to mobility.
What dental changes occur during permanent dentition stage?
By age 15, second permanent molars are fully erupted and apex closed.
What is the significance of dental age estimation in forensic cases?
It helps establish identity when documentation is unavailable or unreliable.
How is the dental crown and root formed?
The crown forms first, followed by root development after crown completion.
