Description
Calculate visible surfaces as a share of assessed eligible surfaces.
Dental records depend on surface notation, assessed and excluded denominators, missing versus observed zero, reporting quanta and recorded equipment dates. Calendar-day counts can be elapsed or inclusive, and nominal expiry comparisons do not establish sterility. Local surface fractions and source labels are not automatically validated clinical indices.
Calculate visible surfaces as a share of assessed eligible surfaces.
When to use this tool
Use Plaque Chart Visible Surface Fraction when you already have visibleSurfaces, assessedEligibleSurfaces and need to calculate visible surfaces as a share of assessed eligible surfaces.
How to use the tool and how it works
- Enter visibleSurfaces, assessedEligibleSurfaces. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read visibleFraction. Use the output convention below.
Require positive safe assessedEligibleSurfaces and visibleSurfaces within total; return visible/eligible.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| visibleSurfaces | Visible Surfaces | Required. Safe integer; minimum 0. |
| assessedEligibleSurfaces | Assessed Eligible Surfaces | Required. Safe integer; minimum 1. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| visibleFraction | Visible Fraction | Required. Finite number. |
{
"input": {
"visibleSurfaces": 12,
"assessedEligibleSurfaces": 40
},
"output": {
"visibleFraction": 0.3
}
}Limitations and assumptions
- This is the supplied surface fraction, not automatically a validated plaque index, full-mouth coverage or measure of oral health.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use original chart, observation and reprocessing records with the complete scoring or controlled workflow. Keep denominator, missingness and date conventions explicit; local arithmetic does not determine oral-health status, appropriate recall intervals or readiness for care.
References
Similar or alternative tools
- Dental Chart Tooth Missing Denominator
Calculate a tooth denominator under a supplied missing-tooth policy.
- Dental Surface Excluded Denominator Flag
Check a supplied observed/nonexcluded surface denominator flag.