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Dentistry solving the unsolved mysteries(forensic odontology)
- 1. GOOD MORNING
- 2. ( • DENTISTRY -SOLVING THE UNSOLVED MYSTERIES (FORENSIC ODONTOLOGY). By K.Mani Kanda Prabhakaran B.D.S IV YEAR Asan Memorial Dental College and Hospital Chengalpet
- 3. INTRODUCTION • Forensic odontology is the application of dental knowledge to those criminal and civil laws that are enforced by police agencies in a criminal justice system. • Forensic dentists may also be asked to assist in determining age ,race, occupation, previous dental history and socio- economic status of the unidentified human beings.
- 4. REVIEW OF LITERATURE • Determination relationship between tooth length of permanent maxillary central and lateral incisors with the stature of srilankan people JEYAWARDHENA et.al • COMPARITIVE EVALUATION OF PERMANENT MAXILLARY CENTRAL INCISSOR CROWN LENGTH WITH FACIAL HEIGHT AND BODY HEIGHT OF 100 PEOPLE. RAGHAVENDRA et al
- 5. FORENSIC SCIENCE • Forensic science is the application of science to criminal and civil laws , mainly-on the criminal side-during criminal investigations, as governed by the legal standards of admissible evidence and criminal procedures.
- 7. • Teeth hardest substance in the body survive in most condition • No two humans have identical dentition • It is straightforward and cheaper. Advantages
- 8. LOCARD’s Principle • According to Locard’s principle – there is exchange of traces between the victim and the convict which forms the basic principle of forensic science.
- 10. • Adolf Hitler died in Berlin (1945). • Charred pieces of bone such as pieces of skull ,the lower jaw and part of upper jaw and part of lower jaw consisting of bridge with nine units were found.
- 11. HITLER’S X-RAY Upper bridge unit LOWER BRIDGE UNIT
- 12. CASE :2 • 19 year girl was killed and burned into ashes. • Forensic people can collect only piece of teeth . • Forensic odontologist found that lining material containing a large amount of zinc
- 13. • Later found that the victim restored her molar with bonded acid etched amalgam restoration using RELY X ARC (1991 ) contains zinc • Percentage of zinc in restorative material equals zinc in the tooth fragment , • Confirms the victim.
- 14. PERUMBAROOR MURDER CASEVictim:- women of 29 years old Place: Perumbaroor , kerala Date of murder :28/04/2016 CASE:-3
- 15. EVIDENCE COLLECTED • Saliva is left on victims dress and DNA is extracted. • Bite marks shows midline diastema 3mm space (most common in keralaites). Two bite marks on left shoulder of the victim (12 cm from the root of the neck,6 cm below the shoulder).
- 16. • . • Mold of teeth of all suspects were made and compared by experts from Gujarat. • The criminal was arrested and evidence is submitted based on the bite marks and the DNA collected from the saliva in the dress of the women match with the suspect ,here bite marks play a key role in identification of the murderer.
- 17. MURDER CASE NO:4 VICTIM:- 27 year old lady. Date of murder:-09/09/2002 Suspect :-51 year old man neighbour of the victim.
- 18. E Removable partial denture recovered from the crime site. Single tooth partial denture for upper right central incissor (11). Projection extending from buccal to palatal surface. Missing upper right central incissor (11). Deep notch extending from buccal to palatal surface i.r.t (11). Spacing in the upper right incissor and canine(12 &13). RPD RECOVERED FROM CRIME SITE ORAL EXAMINATION OF THE SUSPECT
- 19. Confirmation of the suspect CAST REFERENCE OF THE SUSPECT SHOWS DEEP NOTCHING ,SPACING,INCISSIVE PAPILLAE SIMILAR TO THE RPD RECOVERED FROM THE CRIME SITE.
- 20. • The suspect age 51 years was arrested as murderer in this crime . • Report was submitted by forensic odontologist based on Removable Partial Denture of the suspect collected from the crime scene.
- 21. • Victim :Burned in an car accident • Evidence recovered:- Charred body of mandible . • Body of the mandible was carbonized , loss of hard tissue due to fire. • Presence of amalgam restoration in 10 teeth CASE:5 HUMAN BURNED VICTIM IN A CAR ACCIDENT
- 22. • Presence of hard orthodontic appliance,brackets, bands. By comparing treatment of upper right first molar which presented a fracture in palatal surface.
- 23. • By comparing this evidence with the dental history of the man confirms the victim • Here dental recordings and his restoration ,fixed appliance helps in identifying the victim
- 24. CASE:6 DELHI NIRBHYA CASE • In 2012 DELHI NIRBHYA case involved death of a 23 year old female physiotheraphy student. • 4 people was suspected and evidence was submitted by forensic odontologist Dr.Ashith B Acharya based on bite marks on the victim.
- 25. • Plaster of paris impresions of bite marks found on victims body and POP teeth models of all accused are made. • Bite marks matched with the models of three suspects helps in identification of the criminals .
- 26. 1.Preparing the bite mark area by removing hair and debris 2.IMPRESSION TAKEN BY LIGHT BODY IMPRESSION MATERIAL COTTON BACKING
- 27. CONCLUSION • Though forensic odontologist marks its importance in crime investigation • In India it is yet to develop • So dental documentation should be routinely practised and we can maintain the antemortem records.
- 28. REFERENCE • Concise textbook of forensic medicine and toxicology,2nd edition ,2008,elsevier publication by R.K..SHARMA. • Manorama - Dec 18 ,2017 article on Perambaroor case. • The Health site(sep 14 2013) Dr.Ashith B Acharya - The dentist who helped solve the Delhi gang rape case.