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Sex & Race Determination from Teeth

Forensic Odontology • NEET MDS Study Guide • AI-Generated Notes

⭐ High-Yield Facts for Exam

  • Barr body = inactivated X (female).
  • Male teeth generally larger.
  • Mandibular canine index = sexing aid.
  • Shovel incisors = Mongoloid.
  • Carabelli cusp more common in Caucasians.

Sex & Race Determination from Teeth

Sex Determination

  • Barr body (sex chromatin, inactivated X) — present in females; can be assessed in cells.
  • Male teeth are generally larger; the mandibular canine index is used as a sexing aid.
  • Amelogenin gene analysis (X vs Y) gives reliable molecular sexing.

Race/Ancestry Clues

  • Shovel-shaped incisors — associated with Mongoloid populations.
  • Cusp of Carabelli — more frequent in Caucasians.
  • Other crown/cusp traits vary by population.

Exam Tips ⭐

Barr body = female; mandibular canine index for sex; shovel incisors = Mongoloid; Carabelli more in Caucasians.

📝 Practice MCQs — Sex & Race Determination from Teeth

Q1. The Barr body represents:
A. Y chromosome
B. Inactivated X chromosome (sex chromatin)
C. Mitochondria
D. Nucleolus
Show Answer
✅ Answer: B
The Barr body is the inactivated X, seen in females.
Q2. Shovel-shaped incisors are associated with which population group?
A. Caucasoid
B. Mongoloid
C. Negroid
D. None
Show Answer
✅ Answer: B
Shovel-shaped incisors are common in Mongoloid groups.
Q3. A dental index used for sex determination is the:
A. Bolton index
B. Mandibular canine index
C. Pont's index
D. DMFT
Show Answer
✅ Answer: B
The mandibular canine index aids sex determination.
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