Description
Measure an apex-locator mark's signed difference from a reference mark.
Endodontic records use explicit tooth/canal identifiers, length references and device-mark conventions. A numeric offset changes a recorded length without determining anatomical endpoints. A source-qualified canal label preserves supplied wording rather than confirming identification or a clinically appropriate working length.
Measure an apex-locator mark's signed difference from a reference mark.
When to use this tool
Use Apex Locator Reference Mark Gap when you already have observedMarkPosition, referenceMarkPosition and need to measure an apex-locator mark's signed difference from a reference mark.
How to use the tool and how it works
- Enter observedMarkPosition, referenceMarkPosition. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read signedGap. Use the output convention below.
Return observedMarkPosition-referenceMarkPosition without absolute value or clamping.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| observedMarkPosition | Observed Mark Position | Required. Finite number. |
| referenceMarkPosition | Reference Mark Position | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| signedGap | Signed Gap | Required. Finite number. |
{
"input": {
"observedMarkPosition": 21,
"referenceMarkPosition": 20
},
"output": {
"signedGap": 1
}
}Limitations and assumptions
- Positions must share one scale and reference. This does not calibrate an apex locator, determine anatomy or select a clinical working length.
- 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
Review the original clinical record, verified measurement references and complete assessment when a treatment question arises. Keep supplied offset arithmetic and label formatting separate from actual anatomy, instrument position, device interpretation and clinical decisions.
References
Similar or alternative tools
- Root Canal Working Length Offset
Apply a supplied signed offset to a recorded canal reference length.
- Canal Orifice Label
Record explicitly supplied canal-orifice wording and source.