Silness-Löe Plaque Index Calculator

Actual Silness–Loeplaque index, declared independently scored surfaces/tooth sites mean of known ordinalcodes0–3. Actual instrument version, surface selection and clinician scoring independently verified; partial mean explicitly not complete-mouth index or diagnosis.

Description

The Silness–Löe plaque index uses defined site codes.

The Silness–Löe plaque index uses defined site codes.^[1]

A known-site mean summarizes recorded observations and keeps unassessed sites separate. Use this tool to calculate the stated observation or conditional model from supplied measurements.

When to use Silness-Löe Plaque Index Calculator

Use this tool to calculate the stated observation or conditional model from supplied measurements. Establish the qualified examination or measurement context, matching instrument/protocol edition, site order and units.

How to use Silness-Löe Plaque Index Calculator and understand its results

Establish the qualified examination or measurement context, matching instrument/protocol edition, site order and units.
Enter independentlyCodedSiteScores, siteEvidenceKnownFlags, using the field meanings and rules below, then run the tool.
Read result.observedKnownSiteMeanScore, result.knownSiteCount, result.unknownSiteIndices. Interpret each field using the units, signs and evidence rules below.
If input validation fails, correct the reported field and run again. Before applying a successful result, check the stated reference scope, units, assumptions and any retained unknown evidence.

Input field	Meaning	Value type	Requirement
independentlyCodedSiteScores	Independently coded site scores	list of number	Required
siteEvidenceKnownFlags	Site evidence known flags; 1 means known and 0 means unknown; keep the same item order	list of number	Required

Supply nonempty aligned site-score and binary known-flag lists. Every score, including unknown placeholders, must be an integer from 0 through 3. Select scores with known=1; require at least one known site, compute its arithmetic mean, report the known count and retain zero-based unknown indices. This calculates the submitted known-site summary without choosing sites or diagnosing severity.

meanKnownScore=Σ_known(score_i)/knownCount; unknownIndices={i:known_i=0}

Apply the field units and exact ordering, boundary and evidence rules above.

Output field	Meaning	Value type
result	Structured result containing the calculation or selected reference fields below	object
result.observedKnownSiteMeanScore	Arithmetic mean of the known submitted site codes	number
result.knownSiteCount	Number of site observations with known flag 1	number
result.unknownSiteIndices	Zero-based positions of unknown site observations	list of values

json

{
  "input": {
    "independentlyCodedSiteScores": [
      1,
      1,
      1,
      1
    ],
    "siteEvidenceKnownFlags": [
      1,
      1,
      1,
      1
    ]
  },
  "output": {
    "result": {
      "observedKnownSiteMeanScore": 1,
      "knownSiteCount": 4,
      "unknownSiteIndices": []
    }
  }
}

Limitations and assumptions

A known-site mean summarizes recorded observations and keeps unassessed sites separate. Results depend on the independently established measurement basis and the exact model assumptions above.

Every listed input requires an explicit value. Unexpected fields, incorrect value types, nonfinite numbers and sparse numeric arrays fail validation; tool-specific bounds and alignment rules apply as described above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful calculation that reports a false comparison or retains unknown evidence.

Alternative or Complementary methods

Use Debris Index Calculator to examine a related aspect: A debris index summarizes independently coded deposits at examination sites.

Use Calculus Index Calculator where its separate inputs and scope apply: A calculus index summarizes qualified deposit codes at known sites.

References

Silness-Löe Plaque Index Calculator — tool.io

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Debris Index Calculator
A debris index summarizes independently coded deposits at examination sites.
Calculus Index Calculator
A calculus index summarizes qualified deposit codes at known sites.