Suzuki-Tsuchihashi Classification
Definition
The 1970 system that divides lip groove patterns into five main types (I, I', II, III, IV, V) based on groove direction, branching, intersection, and reticularity, with the full print coded by examining each of four lip quadrants independently.
- System developed
- 1970
- Number of pattern types
- Five main types plus variants (six labels total: I, I’, II, III, IV, V)
- Examination method
- Four lip quadrants coded independently
Common questions
What are the pattern types in the Suzuki-Tsuchihashi system?+
The system defines six labels across five main types: Type I features straight vertical grooves, Type I’ is a variant of straight grooves, Type II has branching grooves, Type III shows intersecting patterns, Type IV is reticular or net-like, and Type V is irregular. A single lip usually shows a mix of these types across its different quadrants.
How do forensic analysts use this classification?+
Examiners divide the lip into four quadrants and identify which groove patterns appear in each. This creates a coded print profile for each person. The classification makes it easier to document and compare lip prints in investigations.
Why look at lip prints at crime scenes?+
Lip prints can persist on surfaces, glassware, and bodies. Like fingerprints, they are distinct to each individual and can help link suspects to locations or victims.
Related terms
- Cheiloscopy
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- Forensic Odontology
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- Latent Lip Print
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- Lip Print Persistence
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- Otoscopy (Earprint)
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- Vermilion Border
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Explained in these topics
- Cheiloscopy: Lip Prints and Their Forensic ValueThe 1970 system that divides lip groove patterns into five main types (I, I', II, III, IV, V) based on groove direction, branching, intersection, and reticular...
- Lip, Ear and Bite Marks: Cheiloscopy and Forensic OdontologyFive types of lip-print groove patterns: Type I straight vertical, Type II branched, Type III intersected, Type IV reticular (net-like), Type V irregular. A si...