Forensic Odontology

An Introduction to Forensic Dentistry

J E S S I C A W O N G S B F 6 - 0 4

Forensic Odontology

F O R E N S I C O D O N T O L O G Y I S T H E A P P L I C A T I O N O F D E N T I S T R Y I N L E G A L P R O C E E D I N G S D E R I V I N G F R O M A N Y E V I D E N C E T H A T P E R T A I N S T O T E E T H .

Why Teeth?

    Every human body ages in a similar manner, the teeth also follow a semi-standardized pattern. These quantitative measurements help establish relative age of person.

Each human has an individual set of teeth which can be traced back to established dental records to find missing individuals.

Teeth is made of enamel (hardest tissue of the body) so it can withstand trauma (decomposition, heat degradation, water immersion, and desiccation) better than other tissues in body. Teeth are a source of DNA: dental pulp or a crushed tooth can provide nuclear or mitochondrial DNA that to help identify a person.

Who practices Forensic Odontology and what do they do?

Top: Forensic Odontologist analyzing animal teeth for comparison.

Side: Seal for American Board of Forensic Odontology.

  Forensic Odontologists   Must have DDS degree Should have specialized training in the field through lectures (not required) Forensic dentists help:   Identify human remains (individual and mass) Analyze bite marks    Bite marks are compared to known teeth molds to find origin of bite injuries Estimate age of the victim and perpetrator Trace dental malpractice

History of Forensic Odontology

  

66AD – First body identified using teeth

 Lollia Paulina

Revolutionary War

 Paul Revere was the first forensic dentist in the United States because he identified fallen revolutionary soldiers.

1849 – Mass deaths at Vienna Opera House Fire

 Dental evidence is first admitted into court system in US

Organizations of Forensic Odontology



Bureau of Legal Dentistry (BOLD)



American Board of Forensic Odontology (ABFO)



International Organization for Forensic Odonto-Stomatology (IOFOS)

Teeth

H A R D E S T P A R T O F B O D Y A T T A C H E D T O J A W S . I T S E R V E S T O H E L P D I G E S T F O O D , A C T A S A D E F E N S E M E C H A N I S M , E T C . T E E T H A R E M A D E O F A C R O W N W I T H E N A M E L S U R R O U N D I N G A P U L P .

Teeth Basics

   Approximately 32 teeth in adult mouth Four types of teeth:  Molars    Incisors Teeth differ in:  Premolars Canine Size   Shape Root type

Types of teeth.

Left to right: Incisor, Canine, Premolar, molar.

Childhood

Teeth through the years

Adulthood

 Primary teeth sprout from milk buds and are temporary. Once they fall out, permanent teeth as seen on the other side appear.  Permanent adult teeth come in when primary teeth fall out; they are permanent because they establish roots inside the gums. Third molar come in around the mid teenage years.

Individual Characteristics

      Size of tooth Shape of tooth Shape of root Placement of tooth Quantity of teeth Combinations of dental work done:      Crowns Extractions Bridge Fillings Root canals Various dental work

Analyzing Teeth



The Universal System

1.

2.

3.

Teeth are given a specific number. (Primary teeth are given specific capital letter) Any dental work done on surface is noted Sheets kept on dental file forever. When person is missing, files are transferred to the missing person’s office

Individual Identification

   Postmortem description is generated  X rays and radiographs Positive identification is compared to ante-mortem data Negative identification, a biological profile is generated

Identification

Mass Identification

   Same process is used as individual identification Organization is crucial Family is asked to come identify the body, and narrow down the pool of victims.

Various Teeth Found

Bite Marks

I M P R E S S I O N S F R O M T E E T H F O U N D O N S K I N O R I T E M S L E F T A T A S C E N E . U S U A L L Y O U T L I N E T E E T H P L A C E M E N T .

Where are bite marks found?



Impressions left on food, skin or other items left at a scene.

 Porous surfaces that absorb the impact enough to make an impression  Impressions vary  Depending on the pressure applied, the impression will show accordingly. The more pressure there is, the more detail to the bite.

Analyzing bite marks

     Bite marks are photographed with a scale  Bite marks on skin are taken over repeated intervals Casts of impression are taken Impression traced onto transparencies Casts of suspects teeth are taken Comparison between suspect cast and bite mark

Various Bite Marks

State of Florida v. Ted Bundy

Evidence, various pictures from trial Ted Bundy, was an American serial killer who murdered numerous young women between 1974 and 1978. He confessed to 30 murders, however the total amount of victims remains unknown. He would bludgeon his victims, then strangle them to death. He engaged in rape and necrophilia.

Computer Odontology

    Automatic dental code matching  Bites are run through the computer to find a match OdontoSearch  Compare a data base of missing peoples, felons, government workers Automatic dental identification system  A few minutes will produce a list of people who have the same dental code number 3D Bite mark analysis   3D scans of dental casts are used to generate overlays using various pressure and deviation.

The overlays are compared with the photograph of the bite marks.

• http://www.forensicdentistryonline.org/Forensic_pages_1/ident_guidelines.htm

• http://www.dentalforensics.com/bite%20mark%20injury.htm

• http://www.cse.msu.edu/~cse891/Sect601/CaseStudy/ForensicOdontology.pdf

• http://www.all-about-forensic-science.com/forensic-odontology.html

• http://www.abfo.org/ • http://www.theiai.org/disciplines/odontology/index.php

• www.forensicsciencesfoundation.org

• http://en.wikipedia.org/wiki/Ted_Bundy • http://health.allrefer.com/health/dental-x-rays-development-of-permanent-teeth.html

References

• SLIDE 1 : http://www.angelliftdental.com/sitebuildercontent/sitebuilderpictures/.pond/3652330 800x720.jpg.w300h333.jpg

• SLIDE 2: www.forensicsciencesfoundation.org

• SLIDE 3: www.forensicsciencesfoundation.org

• SLIDE 4: http://img55.imageshack.us/img55/4073/zdg9.jpg

• SLIDE 5: http://www.dentalforensics.com/bite%20mark%20injury.htm

• SLIDE 6: http://www.cse.msu.edu/~cse891/Sect601/CaseStudy/ForensicOdontology.pdf

• SLIDE 7: http://www.cse.msu.edu/~cse891/Sect601/CaseStudy/ForensicOdontology.pdf

• SLIDE 8: http://www.nlm.nih.gov/medlineplus/ency/imagepages/1138.htm

• SLIDE 9: http://www.diyfather.com/files/baby_teeth.jpg

http://medicalimages.allrefer.com/large/development-of-permanent-teeth.jpg

• SLIDE 10: http://a.abcnews.com/images/TheLaw/nm_bite_080514_mn.jpg

• SLIDE 11: http://www.dentalforensics.com/bite%20mark%20injury.htm

• SLIDE 12: http://www.cse.msu.edu/~cse891/Sect601/CaseStudy/ForensicOdontology.pdf

• SLIDE 13: http://www.sciencemag.org/content/vol309/issue5736/images/small/309_892_F2.gif

• SLIDE 14: http://thetoothfairy.net/images/awm.jpg

http://forensicfact.files.wordpress.com/2008/05/image015.jpg

http://www.dentalforensics.com/bite%20mark%20injury.htm

• SLIDE 15-17: http://www.cse.msu.edu/~cse891/Sect601/CaseStudy/ForensicOdontology.pdf

• SLIDE 18: http://phampl.com/biteck.jpg

http://www.dentalforensics.com/bite%20mark%20injury.htm

http://eforensicmed.googlepages.com/800px-Cyst_-_wisdom_tooth.jpg/800px-Cyst_-_wisdom_tooth full.jpg

• SLIDE 19-20: http://www.cse.msu.edu/~cse891/Sect601/CaseStudy/ForensicOdontology.pdf

References for pictures