Understanding the World Standard FDI Two-Digit Notation
The International Dental Federation (FDI World Dental Federation) two-digit numbering system is the universal standard for clinical dental documentation. It eliminates confusion by assigning every tooth a unique two-digit code where the first digit represents the quadrant and the second digit identifies the tooth position from the midline.
Quadrant Mapping Summary
- Permanent Quadrants (1 to 4): Q1 (Maxillary Right 11-18), Q2 (Maxillary Left 21-28), Q3 (Mandibular Left 31-38), Q4 (Mandibular Right 41-48).
- Primary Quadrants (5 to 8): Q5 (Upper Right 51-55), Q6 (Upper Left 61-65), Q7 (Lower Left 71-75), Q8 (Lower Right 81-85).
Pediatric Primary Dentition Quadrants (51-85)
For primary (deciduous) dentition, the FDI system uses quadrant numbers 5, 6, 7, and 8:
- Quadrant 5: Upper Right Primary (51 to 55)
- Quadrant 6: Upper Left Primary (61 to 65)
- Quadrant 7: Lower Left Primary (71 to 75)
- Quadrant 8: Lower Right Primary (81 to 85)
Visual Odontogram Charting in iDentist.Live
iDentist.Live delivers an interactive graphical odontogram where clicking any tooth opens a surface-level condition selector:
- Occlusal / Class I Caries: Red highlighted pit and fissure overlay.
- Root Canal Treatment (RCT): Blue root canal obturation line.
- Fixed Partial Denture (Bridge): Connected crown abutments and pontic lines.
- Dental Implant: Titanium fixture icon overlay on missing tooth sites.
Clinical Demonstration & Workflow Insight
Detailed tooth-by-tooth odontogram mapping for adult and pediatric clinical procedures.
Live Platform Interface Showcase — iDentist.Live
iDentist.Live FDI Odontogram Interface: Interactive adult (11-48) and pediatric (51-85) tooth notation with visual diagnostic condition overlays.
Frequently Asked Questions (FAQs)
Q: What is the FDI tooth numbering system?
The FDI system is an international two-digit tooth numbering standard where the first digit denotes the quadrant (1-4 for adult, 5-8 for primary) and the second denotes tooth position (1-8 or 1-5).
Q: How does digital FDI charting save time in dental clinics?
Digital FDI charting allows dentists to record tooth conditions with single taps, instantly generating treatment estimates in Indian Rupees (₹ 15,000) and visual patient consultation reports.