Description
Measure signed calendar days between retainer issue and replacement.
Dental model coordinates depend on scale, reference midlines, laterality and unit conventions. A wire diameter conversion differs from selecting a wire or estimating force, and a planar point distance differs from a complete arch measurement. Appliance labels and local geometry do not choose treatment stages or establish clinically suitable adjustments.
Measure signed calendar days between retainer issue and replacement.
When to use this tool
Use Retainer Issue Replacement Gap when you already have issueDate, replacementDate and need to measure signed calendar days between retainer issue and replacement.
How to use the tool and how it works
- Enter issueDate, replacementDate. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read signedGapDays. Use the output convention below.
Parse real UTC dates; return replacementDate-issueDate in days.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| issueDate | Issue Date | Required. Text; maximum UTF-16 length 8192. Real proleptic Gregorian YYYY-MM-DD; four-digit years 0000-9999 accepted. |
| replacementDate | Replacement Date | Required. Text; maximum UTF-16 length 8192. Real proleptic Gregorian YYYY-MM-DD; four-digit years 0000-9999 accepted. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| signedGapDays | Signed Gap Days | Required. Finite number. |
{
"input": {
"issueDate": "2026-10-01",
"replacementDate": "2026-11-01"
},
"output": {
"signedGapDays": 31
}
}Limitations and assumptions
- No replacement recommendation, device condition, treatment progress or actual issue event is verified.
- 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.
Alternative or Complementary methods
Use calibrated dental models and the original coordinate, midline and appliance-plan definitions for a full geometric review. Keep simple unit changes and local offsets separate from choosing a wire, stage, force or treatment adjustment.
References
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