Tooth Crown Height Wear Stage Rater

Screen measured relative tooth crown loss against caller wear bands on comparable unworn reference crowns; no embedded species ages, reconstructed wear history or diet diagnosis.

Description

Relative crown loss compares a worn tooth with a comparable unworn reference.

Relative crown loss compares a worn tooth with a comparable unworn reference. Stage codes are a caller-defined partition of that loss.

Screen measured relative tooth crown loss against caller wear bands on comparable unworn reference crowns; no embedded species ages, reconstructed wear history or diet diagnosis.

When to use Tooth Crown Height Wear Stage Rater

Use this tool to screen measured relative tooth crown loss against caller wear bands on comparable unworn reference crowns; no embedded species ages, reconstructed wear history or diet diagnosis.

Prepare the fossil measurements or occurrence records and the chosen calibration parameters. Retain the stated coordinate, age and measurement conventions.

How to use Tooth Crown Height Wear Stage Rater and understand its results

Prepare the fossil measurements or occurrence records and the chosen calibration parameters. Retain the stated coordinate, age and measurement conventions.
Enter observedCrownHeightsMm, referenceUnwornCrownHeightsMm, callerWearLossLowerEdges using the field table and calculation rules, then run the tool.
Read crownHeightLossFractions, callerWearStageCodes. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
observedCrownHeightsMm	Observed crown heights mm	list of number	Required
referenceUnwornCrownHeightsMm	Reference unworn crown heights mm	list of number	Required
callerWearLossLowerEdges	Caller wear loss lower edges	list of number	Required

Align nonnegative observations with positive references and require loss in [0,1]. Use 2–128 increasing fraction edges beginning at zero. Return zero-based stages, with equality entering the stage starting at the edge.^[1]

Paired lists must be nonempty and have equal lengths. Each sequence checked for increasing order must contain at least two strictly increasing values.

loss fraction = 1 − observed height/reference height

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
crownHeightLossFractions	Crown height loss fractions	list of number
callerWearStageCodes	Caller wear stage codes	list of number

json

{
  "input": {
    "observedCrownHeightsMm": [
      5,
      2
    ],
    "referenceUnwornCrownHeightsMm": [
      10,
      10
    ],
    "callerWearLossLowerEdges": [
      0,
      0.3,
      0.7
    ]
  },
  "output": {
    "crownHeightLossFractions": [
      0.5,
      0.8
    ],
    "callerWearStageCodes": [
      1,
      2
    ]
  }
}

Limitations and assumptions

No species age, wear history or dietary diagnosis is embedded.

Numbers and computed results must be finite; overflow produces an error. Numeric lists are limited to 100,000 entries; the rules above may require smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Hypsodonty Index: Compute caller convention unworn crown height/buccolingual width hypsodonty and screen a comparison band; observed worn height is a different tool, and neither index establishes diet. For a complementary task, use Mesowear Angle Diet Classifier: Compare caller mesowear relief/angle morphology criteria, preserving discordance rather than labeling actual diet; calibration, wear stage and taxonomic applicability remain external.

References

Tooth Crown Height Wear Stage Rater — tool.io

Similar or alternative tools

Hypsodonty Index
Compute caller convention unworn crown height/buccolingual width hypsodonty and screen a comparison band; observed worn height is a different tool, and neither index establishes diet.
Mesowear Angle Diet Classifier
Compare caller mesowear relief/angle morphology criteria, preserving discordance rather than labeling actual diet; calibration, wear stage and taxonomic applicability remain external.