Craniofacial identification: superimposition, reconstruction, sinuses

What it is

When a skull has no records for dental comparison or no DNA match, three methods use its shape. Craniofacial superimposition overlays an image of the skull on a photograph taken in life of the presumed person, matching landmarks such as the eyes, nose and jaw; it depends heavily on matching the camera's viewpoint and distance, on the quality of the photograph and on the analyst's experience. Frontal sinus comparison overlays postmortem and antemortem radiographs of the skull: the outline of the frontal sinuses varies a great deal between people and can be very specific, but it needs an X-ray taken in life in a similar projection. Facial approximation (reconstruction) builds a face on the skull using soft-tissue thickness data; it does not identify anyone, but it can prompt someone to recognise the person and so lead to a primary method.

Accuracy and limits

• A mismatch excludes; a good match supports but rarely proves identity on its own.
• Validation studies show that material quality and analyst experience strongly influence results.
• Soft-tissue thickness varies between populations and regions, so data must match the person's group.
• Facial approximation accuracy has not been established; it is an investigative tool.

What it is based on

• The soft tissues of the face follow the skull with fairly predictable thicknesses at standard points.
• The frontal sinuses form air spaces whose outline differs between people.
• A photograph is a two-dimensional projection, so the skull must be placed in the same position and perspective.

How it is applied

1. Confirm that primary methods (teeth, DNA, fingerprints) are not possible or have no comparison data.
2. Collect good photographs from life of the presumed person, ideally several views.
3. For superimposition, scan or photograph the skull and match its position and perspective to each photograph.
4. Compare anatomical landmarks and outlines; grade the result as exclusion or as limited, moderate or strong support.
5. For the sinuses, X-ray the skull in the same projection as the antemortem film and compare the outlines.
6. For facial approximation, use soft-tissue data from the right population and present it as a lead only.
7. Report the method, the material used and its limits.

Next step: what to do and document

• Keep the skull and teeth intact and avoid damaging the frontal bone during the autopsy of an unidentified body.
• Ask the authority to look for skull or sinus radiographs from life (for example from an old head injury).
• Use these methods to guide or exclude, and confirm identity with a primary method whenever possible.
• State the level of support in the report, not a definite identification.

Common mistakes

• Reporting a superimposition match as a positive identification.
• Comparing sinus radiographs taken in different projections.
• Presenting a facial approximation as a portrait of the person.
• Using soft-tissue data from another population.

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Educational content on forensic and legal medicine; not legal advice and no substitute for the technical guides of Colombia's National Institute of Legal Medicine and Forensic Sciences. Laws change: each page links the official text and says when it was last checked. For a real case, follow the guide in force and ask the competent authority.

Sources: The Critical Photographic Variables Contributing to Skull-Face Superimposition Methods to Assist Forensic Identification of Skeletons: A Review (Journal of Imaging (Healy SS, Stephan CN), 2024); Computer-aided craniofacial superimposition validation study: the identification of the leaders and participants of the Polish-Lithuanian January Uprising (1863-1864) (International Journal of Legal Medicine (Martos R et al.), 2024); Uniqueness of radiographic patterns of the frontal sinus for personal identification (Imaging Science in Dentistry (Patil N et al.), 2012); Facing the Unknown: Integration of Skeletal Traits, Genetic Information and Forensic Facial Approximation (Genes (Adserias-Garriga J et al.), 2025); Facial soft tissue thickness in forensic facial reconstruction: Impact of regional differences in Brazil (PLoS One (Moritsugui DS et al.), 2022).

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