Human teeth numbering system
Pro Research Analysisby 
Searched over 200M research papers
Overview of Human Teeth Numbering Systems
Teeth numbering systems are essential for accurate identification, communication, and record-keeping in dentistry. Several systems are used worldwide, each with its own strengths and weaknesses, and new systems continue to be proposed to address existing challenges Peck1993Khan2020Mulla2024.
Commonly Used Teeth Numbering Systems
Universal Numbering System
The Universal Numbering System is widely used in the United States. It numbers the permanent teeth from 1 to 32, starting from the upper right third molar and moving around the arch to the lower right third molar. For primary (deciduous) teeth, it uses uppercase letters A through T Bernstein1985Khan2020Santosh2024. This system is straightforward but can be confusing when matching specific teeth to their quadrants or anatomical locations .
FDI Two-Digit System
The Federation Dentaire Internationale (FDI) system is a two-digit notation used globally, except in the USA. The first digit indicates the quadrant (1-4 for permanent teeth, 5-8 for primary teeth), and the second digit identifies the tooth position within the quadrant (1-8) Peck1993Khan2020Mulla2024+1 MORE. The FDI system is praised for its logical structure and compatibility with digital records, but confusion can arise due to the lack of separators between digits, especially when compared to the Universal system Peck1993Santosh2024.
Palmer (Zsigmondy) Notation
The Palmer notation divides the mouth into four quadrants, using numbers (permanent teeth) or letters (primary teeth) and specific symbols to indicate the quadrant. It is commonly used in academic settings, but its symbols can be difficult to reproduce in digital formats Peck1993Khan2020Mulla2024.
Challenges and Drawbacks of Existing Systems
All major systems have drawbacks. The Universal system lacks clear anatomical references, the FDI system can be confusing without separators, and the Palmer system is not easily adapted to digital records Peck1993Mulla2024Santosh2024. Additionally, these systems are designed primarily for dental professionals, often leaving patients confused about which teeth are being referenced Tikku2022Mulla2024.
Recent Innovations and Proposed Systems
TT (Tikku and Tikku) System
The TT system was developed to be more intuitive for both dental professionals and patients. It uses simple, self-reflecting codes that are easier for non-dental professionals to understand. However, some users still find it confusing, especially from a patient’s perspective Tikku2022Mulla2024.
qpdb System
The qpdb system divides the mouth into four quadrants, each represented by a letter (q, p, d, b). It aims to reduce confusion and simplify data entry, but it is still new and lacks widespread adoption or validation .
Havale's Alphaneumarical Dental Notation
This system was designed to be easy to read, write, and type, maintaining the anatomical midline and being suitable for routine use. While it is user-friendly for beginners, there can be confusion or overlap when recording mixed dentition .
Proposed Revisions to FDI System
A recent proposal suggests adding a separator (such as a dot) between the two digits in the FDI system to reduce confusion with the Universal system and improve clarity in both clinical and academic settings .
Teeth Numbering in Digital and Automated Systems
Automated systems for dental radiographs use algorithms to classify and number teeth based on common numbering systems, achieving high accuracy in both classification and numbering. These systems rely on features like tooth shape and position, and they typically use the Universal or FDI systems for reference Lin2010Mahoor2005.
Conclusion
Human teeth numbering systems are vital for dental practice, but each has limitations in clarity, ease of use, and patient understanding. While the Universal, FDI, and Palmer systems remain the most widely used, new systems and modifications are being proposed to address their shortcomings. Innovations such as the TT, qpdb, and revised FDI systems aim to make tooth identification simpler and more accessible for both professionals and patients, but further validation and adoption are needed to determine their effectiveness in practice Shehabeldin2024Tikku2022Thimmegowda2021+2 MORE.
Sources and full results
Most relevant research papers on this topic
DOI