Clinical Attachment Loss Calculator

Actual CALcoordinate=probingdepth+signed gingival margin displacement apical to CEJ; coronal margin NEGATIVE. Matching anatomical site/calibrations required. Negative coordinate retained as inconsistency/coronal attachment for review, not diagnosis.

Description

Clinical attachment level combines probing depth with the gingival margin's signed location relative to the CEJ.

Clinical attachment level combines probing depth with the gingival margin's signed location relative to the CEJ.^[1]

An apical-positive convention keeps coronal margin positions negative. Use this tool to calculate the stated observation or conditional model from supplied measurements.

When to use Clinical Attachment Loss 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 Clinical Attachment Loss Calculator and understand its results

Establish the qualified examination or measurement context, matching instrument/protocol edition, site order and units.
Enter independentlyMeasuredProbingDepthMm, independentlyMeasuredSignedGingivalMarginApicalToCejMm, using the field meanings and rules below, then run the tool.
Read result.signedClinicalAttachmentLevelMm. 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
independentlyMeasuredProbingDepthMm	Independently measured probing depth mm	number	Required
independentlyMeasuredSignedGingivalMarginApicalToCejMm	Independently measured signed gingival margin apical to cej mm	number	Required

Require nonnegative probing depth and finite signed gingival margin position in millimeters, using apical-to-CEJ as positive. Add them for signed attachment level; negative outputs are accepted. No anatomical assessment, disease category or zero clamp is applied.

signedAttachmentLevelMm=probingDepthMm+signedMarginApicalToCejMm

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.signedClinicalAttachmentLevelMm	Signed Clinical Attachment Level Mm; use the units, sign convention and calculation stated above	number

json

{
  "input": {
    "independentlyMeasuredProbingDepthMm": 4,
    "independentlyMeasuredSignedGingivalMarginApicalToCejMm": 2
  },
  "output": {
    "result": {
      "signedClinicalAttachmentLevelMm": 6
    }
  }
}

Limitations and assumptions

An apical-positive convention keeps coronal margin positions negative. 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 Recession Depth Percentage Calculator to examine a related aspect: Recession as a percentage requires a stated root-length reference.

Use Average Probing Pocket Depth Calculator where its separate inputs and scope apply: Mean probing depth summarizes independently measured periodontal sites.

References

Clinical Attachment Loss Calculator — tool.io

Similar or alternative tools

Recession Depth Percentage Calculator
Recession as a percentage requires a stated root-length reference.
Average Probing Pocket Depth Calculator
Mean probing depth summarizes independently measured periodontal sites.