Purpose
Correctly identify each tooth and surface when it appears in dental records, claims and insurance communication.
Time: 10 min
Universal Numbering System (USA)
The standard used in Open Dental, claims, and insurance portals:
| Tooth type | Notation | Range |
|---|---|---|
| Permanent teeth | Numbers | 1 to 32 |
| Primary (baby) teeth | Letters | A to T |
Direction: Counted from right to left of patient (view from outside). Tooth #1 is upper right third molar. #16 is upper left third molar. #17 drops to lower left third molar; #32 ends at lower right third molar.
Quadrants
| Abbreviation | English | Spanish | Teeth |
|---|---|---|---|
| UR | Upper Right | Superior derecho | 1–8 |
| UL | Upper Left | Superior izquierdo | 9–16 |
| LL | Lower Left | Inferior izquierdo | 17–24 |
| LR | Lower Right | Inferior derecho | 25–32 |
Application: Treatments like SRP (D4341/D4342) are reported by quadrant, not by individual tooth.
Tooth surfaces
| Abbreviation | Surface | Definition | Clinical application |
|---|---|---|---|
| M | Mesial | Toward midline of face | Cavities between adjacent teeth |
| D | Distal | Away from midline | Cavities on back face |
| B / F | Buccal / Facial | Outer surface toward cheek/lips | Cosmetic, visible restorations |
| L | Lingual | Inner surface toward tongue (lower) | Hard to reach for cleaning |
| P | Palatal | Inner surface toward palate (upper) | Inner restorations |
| O | Occlusal | Top surface of molars/premolars | Sealants, chewing-surface cavities |
| I | Incisal | Edge of front teeth | Fractures, cosmetic |
Common combinations
Surfaces are combined in filling codes:
- MO: Mesio-Occlusal (between + chewing)
- MOD: Mesio-Occlusal-Distal (all three)
- BO: Bucco-Occlusal
- DL: Disto-Lingual
Example: "Filling on tooth #14 surface MOD" = restoration on upper left first molar covering mesial, occlusal and distal surfaces.