Dental Notations

Introduction

Function of Teeth: Form part of the masticatory apparatus, embedded in the jaws.
Dental Arches:
- Maxillary Arch: Upper jaw.
- Mandibular Arch: Lower jaw.
Quadrants: Each arch is split by a midline into left and right quadrants, yielding four quadrants total.
Diphyodont Dentition:
- Humans have two sets of teeth:
  - Primary (deciduous): First set.
  - Permanent (succedaneous): Replaces the primary set.
Tooth Count & Distribution:
- Primary: 20 total — 2 Incisors, 1 Canine, 2 Molars per quadrant.
- Permanent: 32 total — 2 Incisors, 1 Canine, 2 Premolars, 3 Molars per quadrant.
Tooth Position Diagrams: Lists the positions and arrangement of both primary and permanent teeth, subdivided into upper/lower segments.

Definition: A system used to refer to teeth through written or verbal codes.
Purpose: Standardizes communication in dental practice.
Common Systems:
1. FDI Notation System (International)
2. Universal Numbering System (American)
3. Palmer Notation Method (Orthodontic/Chart-based)
Preference in Zambia: The FDI system is the standard.

Also Known As: ISO 3950 or International Standards Organization Designation System.
Global Usage: Favored by WHO and many international dental professionals.
Structure:
- Two Digits:
  - First digit: Denotes quadrant.
  - Second digit: Indicates the tooth's position from the midline.
Quadrant Codes:
- Permanent Teeth:
  - 1: Upper Right
  - 2: Upper Left
  - 3: Lower Left
  - 4: Lower Right
- Primary Teeth:
  - 5: Upper Right
  - 6: Upper Left
  - 7: Lower Left
  - 8: Lower Right
Examples:
- Permanent upper right central incisor: 11 (spoken as "one-one").
Diagrams:
- Full graphical representation of permanent and primary dentition using FDI codes.
Self-Assessment: Six answers (e.g., 21, 34, 47, etc.) to test understanding.

Origin: Adopted by the American Dental Association (ADA).
Structure:
- Permanent Teeth: Numbered 1–32.
  - Begins at upper right third molar (1), proceeds to upper left (16), then continues from lower left (17) to lower right (32).
- Primary Teeth: Identified using:
  - Letters A–T.
  - Or numbers 1d–20d.
Unique Feature:
- Each tooth receives a unique symbol, ideal for keyboard use.
Diagrams:
- Includes side-by-side illustrations of maxillary and mandibular dentition.
Self-Assessment:
- Answer key with formats like “16,” “D/4d,” “T/20d,” etc.

Historical Origin: Developed by Adolf Zsigmondy (1861).
Structure:
- Symbol (bracket or quadrant line) designates quadrant.
- Number (1–8) or letter (A–E) specifies position from midline.
  - Permanent Teeth: Numbers 1–8.
  - Primary Teeth: Letters A–E (formerly Roman numerals I–V).
Example Notation:
- 2] or 2/ = Maxillary right lateral incisor.
- /2 = Mandibular left lateral incisor.
Challenges:
- Difficult to reproduce graphically in electronic formats.
- Alternatives: use slash (/) or backslash () to approximate quadrant lines.
Diagrams:
- Schematic of quadrant-based dental arches.
Self-Assessment:
- Examples include “3],” “3/,” “L5,” “15,” “LA,” “JA,” “C/,” etc.

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