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Effects of skin elasticity on bite mark distortion
Cheri Lewis1, Leonor A Marroquin2
18500 Wilshire Blvd, Beverly Hills, CA, United States.
Forensic Science International
|October 10, 2015
Summary
Bite mark analysis accuracy is significantly impacted by distortion, with tooth width changing up to 53.8%. This distortion, influenced by factors like age and weight, affects the reliability of bite mark evidence in legal contexts.
Area of Science:
- Forensic Odontology
- Biomechanical Analysis
Background:
- Bite marks are considered valuable forensic evidence, comparable to fingerprints.
- Concerns exist regarding the accuracy and reliability of bite mark interpretation due to potential distortion.
Purpose of the Study:
- To quantify the degree of distortion in bite mark impressions under varying conditions.
- To assess the impact of body positioning on bite mark measurements.
Main Methods:
- Inked denture stamps simulated bite marks on 40 volunteers' shoulders.
- Four arm positions were photographed with an ABFO #2 reference scale.
- Measurements of tooth width and intercanine distance were compared across positions.
Main Results:
- Maximum tooth width distortion reached 53.8%.
- Maximum intercanine distance distortion was 41.9%.
- Distortion increased with participant age and weight and varied across the dental arch.
Conclusions:
- Significant distortion occurs in bite mark impressions, challenging interpretation.
- Factors such as body position, age, and weight demonstrably affect bite mark measurements.
- The findings highlight the need for caution and advanced methods in bite mark analysis for forensic applications.
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