Under this naming system, primary and permanent teeth are named differently. Universal Teeth Numbering System In Adult DentitionĪ teeth numbering system was first used in 1882 by Dr. So let’s dive deeper into different types of teeth numbering systems and what it all means? These numbers become more confusing for patients who are looking to communicate with overseas dental clinics. Sometimes, these numbers are spoken aloud during an examination, and often patients have no idea what all these numbers mean. Dentists maintain patients’ records of tooth conditions based on these numbers. Teeth numbering is a terminology used within the dental industry to communicate the identity and position of teeth. However, there are three most common numbering systems. Left and Right on the teeth chart correspond to the patient's left and right respectively (patient's view).Teeth numbering is often confusing for many patients who travel overseas as the teeth numbering varies in different parts of the world. Primary (Baby or Deciduous) Teeth Names & Numbersįor primary teeth, most dentists in United States use a modified version of the Universal Numbering System, with each primary tooth assigned a letter (from A to T) instead of a number. Left and Right on the teeth chart correspond to the patient's left and right respectively (patient's view). Next to its tooth you can see the tooth number based on:Ī) the Universal Numbering System (UNS) used in the United States and b) the FDI notation (FDI) Permanent Teeth Names & Numbers central and lateral for incisors, first and second for premolars, first, second, and third for molars.īased on these characteristics, the teeth names for the permanent dentition are the following (starting from the upper right back tooth and moving anti-clockwise): A secondary name for the teeth types that appear more than once in each quadrant of the mouth e.g. The type of tooth: incisor, canine, premolar, and molar.The jaw where they are located: upper and lower (alternatively the terms maxillary and mandibular can be used).Teeth names are created by a combination of 4 different characteristics: This tooth numbering system is called, the Two-Digit World Dental Federation Notation or FDI notation system. The combination of these two numbers (Quadrant code number & Tooth code number) specifies how are teeth numbered. In the FDI notation each one of these 8 teeth is assigned a number from 1 to 8, starting from the center front tooth (central incisor) and moving backwards up to the third molar (number 8).Įach quadrant is also assigned a number, from 1 to 4 for the adult (permanent) teeth or 5 to 8 for the baby (primary or deciduous) teeth. Each quadrant of the mouth has 8 different teeth that are mirrored horizontally and vertically to the other quadrants. The human teeth are symmetrically arranged in the mouth. The second system, developed by the Fédération Dentaire Internationale (FDI), World Dental Federation notation is also known as ISO-3950 notation. The primary teeth are designated by upper case letters A through T, with A being the patient's upper right second primary molar and T being the lower right second primary molar. However, most dentists today use a modified version of the Universal Numbering System for children, with letters instead of teeth numbers. In the original system, children's 20 primary teeth are numbered in the same order (from 1 to 20), except that a small letter "d" follows each number to indicate deciduous (primary) teeth. Up to the tooth farthest back on the bottom right side of the mouth (number 32).Īll teeth that should be there are numbered, including those teeth that have been removed for any reason or have not erupted yet (e.g. The tooth numbering continues by assigning teeth numbers descending to the lower left third molar (number 17) and follows the lower (mandibular) jaw Numbering of teeth continues along the upper teeth toward the front and across to the last molar tooth back on the top left side (number 16). In the universal tooth numbering system, tooth number 1 is the patient's upper right third molar, on the right side of the mouth in the upper (maxillary) jaw. The Universal Numbering System is a simplified method of identifying teeth that is approved and adopted by the American Dental Association.
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