Odontolgy notes

Chapter Overview

  • Forensic Odontology: Study of the anatomy and growth of teeth and associated diseases.

  • Forensic Odontologist: Specialist uses knowledge of teeth for victim identification, police assistance, and abuse verification.

Objectives

  1. Structure of a typical tooth.

  2. Compare permanent and deciduous dentition.

  3. Value of odontology in forensic investigations.

  4. Teeth and craniofacial features in estimating age, ancestry, and sex.

  5. Differentiate human dentition from that of other animals.

Case Study: Ted Bundy

  • Background: Notorious serial killer operating in the 1970s in the Northwestern U.S.

  • Pattern of college women going missing.

  • Arrest linked to evidence found in his car and apartment.

  • Involved bite marks on victims leading to notable forensic investigations.

Structure and Function of Teeth (Objectives 11.1, 11.2)

  • Tooth Regions:

    • Crown: Above gum line.

    • Neck: Junction of crown and root.

    • Root: Embedded in bony socket.

  • Tissue Components:

    • Dentin: Connective tissue providing shape.

    • Pulp: Contains nerves and blood vessels.

    • Enamel: Hard outer layer (calcium carbonate and phosphate).

    • Cementum: Covers root dentin.

    • Periodontal ligament: Anchors tooth to bone.

  • Dentition:

    • 20 deciduous (baby) teeth.

    • 32 permanent (adult) teeth.

    • Tooth types: Incisors, Canines, Molars.

Estimating Physical Characteristics (Objectives 11.3, 11.4)

  • Dental Records Comparison:

    • Antemortem records (before death) vs. postmortem records (after death).

    • Consider dental alterations: fillings, caps, bridgework, dentures.

  • Characteristics for Age Estimation:

    • Ubelaker's Chart indicates emergence patterns of human teeth at different ages.

Ancestry Estimation

  • Physical Characteristics:

    • Cannot definitively determine ancestry; certain traits are common in specific groups.

    • Incisor shape can be indicative with less than 10% occurrence in European and African descent.

Sex Estimation

  • Determination Challenges:

    • Male teeth: generally larger.

    • Female teeth: canines often more pointed.

    • Craniofacial features provide more accurate sex determination than teeth alone.

Identifying Remains (Objectives 11.3, 11.5)

  • Presumptive vs. Positive Identification:

    • Presumptive: personal effects, family ID, location.

    • Positive: fingerprints, DNA, medical and dental records.

  • Role of Dental Records:

    • Essential in forensic investigations, particularly in identifying unknown decedents.

Human Bite Marks

  • Context and Characteristics:

    • Bite marks vary in appearance based on surface type (skin vs. hard surfaces).

    • Postmortem bites do not show typical bruising or swelling.

    • Patterns: typical bite shows double horseshoe configuration.

  • Examination Procedure:

    • Analysis of color and black-and-white photos.

    • Measuring bite dimensions for comparison.

Animal Bite Marks

  • Comparison with Human Bites:

    • Different dentition patterns observed.

    • DNA and bite patterns analyzed similarly to humans.

Chapter Summary

  • Forensic odontologists use tooth knowledge for identifying unknown individuals, assisting in criminal investigations, and detecting abuse.

  • Humans possess two sets of teeth, critical for both mechanical digestion and forensic analysis.

  • Identification tools include dental records that withstand decomposition, making them vital for analyzing burned or decomposed bodies.

  • Bite marks can narrow suspect lists but are not standalone conclusive evidence; they may contain DNA traces for further identification.