In age determination from dental remains, which is the most common tooth used for estimating age in subadults through the assessment of root development and eruption?

Explanation

## Age Determination from Dental Development in Subadults **Key Point:** The mandibular first molar is the most commonly used tooth for age estimation in subadults because it erupts early, shows clear developmental stages, and is frequently preserved in skeletal remains. ### Why the Mandibular First Molar is Preferred 1. **Early Eruption Timeline** - First permanent tooth to erupt (age 5–6 years) - Provides a reliable anchor point for age estimation in young children - Root completion by age 9–10 years 2. **Clear Developmental Stages** - Crown formation: ages 0–4 years - Root development: ages 4–9 years - Root completion: age 9–10 years - Apical closure: age 10–12 years - Each stage is distinct and easily observable 3. **Durability and Preservation** - Large, robust tooth with thick enamel - Frequently survives in skeletal remains - Less prone to post-mortem damage than incisors ### Dental Age Estimation Methods | Method | Tooth Used | Age Range | Accuracy | |--------|-----------|-----------|----------| | **Eruption Sequence** | All teeth | 0–18 years | ±1–2 years | | **Crown Formation** | First molars | 0–5 years | ±6 months | | **Root Development** | First molars | 5–10 years | ±1 year | | **Root Completion** | Canines, premolars | 10–16 years | ±1–2 years | | **Apical Closure** | Third molars | 16–25 years | ±2–3 years | **High-Yield:** The **mandibular first molar erupts first among permanent teeth** (age 5–6 years) and is the most reliable single tooth for subadult age estimation. Demirjian's method uses this tooth prominently in its scoring system. **Clinical Pearl:** In Indian forensic cases involving child remains, the mandibular first molar is often the only tooth available for age estimation because it is the most robust and frequently preserved. **Mnemonic: MFM-FIRST** — **M**andibular **F**irst **M**olar erupts **FIRST** and is used **FIRST** for age estimation. ### Eruption Sequence (Permanent Teeth) 1. Mandibular first molars (5–6 years) 2. Maxillary first molars (6–7 years) 3. Mandibular central incisors (6–7 years) 4. Maxillary central incisors (7–8 years) 5. Mandibular lateral incisors (7–8 years) [cite:Vij's Textbook of Forensic Medicine and Toxicology 6e Ch 8; Demirjian et al. 1973]