Universal to FDI Numbering Converter
Convert standard USUniversal1–32/A–Tto FDI permanent/primary. Exact upper-case primary labels required; actual anatomy external.
Description
Universal and FDI notation identify the same teeth using different code systems.
When to use Universal to FDI Numbering Converter
Use this tool to convert independently identified tooth identifiers between the stated notation systems. Establish the qualified examination or measurement context, matching instrument/protocol edition, site order and units.
How to use Universal to FDI Numbering Converter and understand its results
- Establish the qualified examination or measurement context, matching instrument/protocol edition, site order and units.
- Enter independentlyIdentifiedUniversalTooth, using the field meanings and rules below, then run the tool.
- Read result.fdiTooth. 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 |
|---|---|---|---|
| independentlyIdentifiedUniversalTooth | Independently identified universal tooth | string | Required |
Enter an exact case-sensitive string for an independently identified tooth. The committed crosswalk covers 32 permanent and 20 primary teeth: FDI quadrants 1–4 with positions 1–8 and 5–8 with positions 1–5, matched to Universal 1–32 and A–T. Construct the inverse FDI-to-Universal map and select the FDI value for the exact Universal token. Unrecognized, padded or supernumerary tokens fail. No tooth identification from images or anatomy occurs.
| FDI token | Universal token |
|---|---|
| 11 | 8 |
| 12 | 7 |
| 13 | 6 |
| 14 | 5 |
| 15 | 4 |
| 16 | 3 |
| 17 | 2 |
| 18 | 1 |
| 21 | 9 |
| 22 | 10 |
| 23 | 11 |
| 24 | 12 |
| 25 | 13 |
| 26 | 14 |
| 27 | 15 |
| 28 | 16 |
| 31 | 24 |
| 32 | 23 |
| 33 | 22 |
| 34 | 21 |
| 35 | 20 |
| 36 | 19 |
| 37 | 18 |
| 38 | 17 |
| 41 | 25 |
| 42 | 26 |
| 43 | 27 |
| 44 | 28 |
| 45 | 29 |
| 46 | 30 |
| 47 | 31 |
| 48 | 32 |
| 51 | E |
| 52 | D |
| 53 | C |
| 54 | B |
| 55 | A |
| 61 | F |
| 62 | G |
| 63 | H |
| 64 | I |
| 65 | J |
| 71 | O |
| 72 | N |
| 73 | M |
| 74 | L |
| 75 | K |
| 81 | P |
| 82 | Q |
| 83 | R |
| 84 | S |
| 85 | T |
result=inverseToothMap[exactUniversalToken] 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.fdiTooth | Exact FDI tooth token selected or constructed from the supplied independently identified tooth | string |
{
"input": {
"independentlyIdentifiedUniversalTooth": "8"
},
"output": {
"result": {
"fdiTooth": "11"
}
}
}Limitations and assumptions
Conversion requires an independently identified tooth and a stated dentition. 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 Palmer to FDI Numbering Converter to examine a related aspect: Palmer notation combines a quadrant with a position counted from the midline.
Use FDI to Universal Numbering Converter where its separate inputs and scope apply: FDI tooth codes encode quadrant and position, while Universal codes enumerate permanent teeth or letter primary teeth.
References
-
Universal to FDI Numbering Converter — tool.io
-
Universal Tooth Designation System — American Dental Association
Similar or alternative tools
- Palmer to FDI Numbering Converter
Palmer notation combines a quadrant with a position counted from the midline.
- FDI to Universal Numbering Converter
FDI tooth codes encode quadrant and position, while Universal codes enumerate permanent teeth or letter primary teeth.