{
    "title": "Purple Nutsedge vs Tooth Decay",
    "inventor_name": null,
    "publication_year": 2014,
    "device_name": null,
    "goal": "Determine whether ingestion of Cyperus rotundus (purple nutsedge) tubers contributed to the unusually low incidence of dental caries in an ancient Sudanese population.",
    "problem_addressed": "High prevalence of tooth decay associated with carbohydrate-rich diets in early agricultural societies.",
    "concept_summary": "Archaeological dental calculus from 2,000-year-old Sudanese skeletons contained chemical markers of Cyperus rotundus. Laboratory extracts of the plant inhibit Streptococcus mutans, the primary bacterium responsible for caries. The study suggests that chewing the tubers may have acted as a primitive antibacterial oral hygiene measure, explaining the low cavity rate observed in the population.",
    "detailed_description": null,
    "category": "Medical & Dental Technologies",
    "principles": [
        "Antibacterial activity of plant secondary metabolites",
        "Mechanical cleaning of teeth by chewing fibrous tubers",
        "Chemical fingerprinting of ancient dental calculus"
    ],
    "scientific_domains": [
        "Archaeology",
        "Dental Science",
        "Microbiology",
        "Analytical Chemistry"
    ],
    "mechanisms_of_action": [
        "Inhibition of Streptococcus mutans growth by terpenoid compounds",
        "Physical disruption of plaque biofilm during chewing"
    ],
    "materials": [
        "Cyperus rotundus tuber (purple nutsedge)",
        "Essential oil constituents (monoterpenoids, sesquiterpenoids)",
        "Dental calculus (mineralised plaque)"
    ],
    "energy_sources": [],
    "inputs": [
        "Cyperus rotundus tubers (ingested or chewed)",
        "Oral bacterial flora"
    ],
    "outputs": [
        "Reduced growth of S. mutans",
        "Lower incidence of dental caries"
    ],
    "claimed_performance": "Fewer than 1 % of the examined teeth showed cavities, abscesses, or other signs of decay.",
    "experimental_evidence": "GC-MS analysis of dental calculus identified C. rotundus terpenoids; independent laboratory tests showed that extracts of the plant inhibit S. mutans growth.",
    "replication_status": null,
    "keywords": [
        "Cyperus rotundus",
        "Dental calculus",
        "Streptococcus mutans",
        "Ancient diet",
        "Antibacterial plant compounds"
    ],
    "related_technologies": [
        "Dental calculus chemical analysis",
        "TD/Py-GC-MS",
        "Archaeological biomolecular techniques"
    ],
    "controversy_level": "low",
    "confidence_score": 0.9,
    "practicability_score": 0.5,
    "fringe_score": 0.2,
    "evidence_strength": 0.6,
    "risk_score": 0.1,
    "trl_estimate": 4,
    "source_urls": [
        "http://news.nationalgeographic.com/news/2014/07/140716-sudan-sedge-toothbrush-teeth-archaeology-science/#",
        "http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0100808"
    ],
    "organizations": [
        "University of Missouri-St. Louis",
        "Autonomous University of Barcelona",
        "Center for Sudanese and Sub-Saharan Studies"
    ],
    "applications": [
        "Natural oral-hygiene agents",
        "Historical dietary reconstruction",
        "Development of plant-based antibacterial formulations"
    ],
    "limitations": [
        "Correlation does not prove causation between tuber consumption and low caries",
        "No direct clinical trials on modern humans",
        "Potential bitterness of tubers may limit acceptance",
        "Sample size limited to one archaeological site"
    ],
    "open_questions": [
        "What concentration of C. rotundus compounds is required for effective caries prevention?",
        "Did the antibacterial effect act alone or synergistically with other dietary factors?",
        "Are there any long-term health effects from regular consumption of the tubers?"
    ],
    "red_flags": [],
    "evidence_quotes": [
        "\"Fewer than one percent of the teeth had cavities, abscesses, or other signs of tooth decay...",
        "\"Extracts of the weed impede the growth of the bacteria most widely implicated in tooth decay.\"",
        "\"Laboratory testing of C. rotundus extract has demonstrated that this inhibits S. mutans.\"",
        "\"Chemical evidence for ingestion of C. rotundus... identification of mono- and sesquiterpenoids ...\"",
        "\"The low prevalence of dental caries may have been contributed to by chewing C. rotundus tubers.\""
    ]
}