biology

Palmer notation

Palmer notation is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Palmer notation rather than just read about it. In short: Palmer notation (sometimes called the military system) is a dental notation system (tooth numbering system) named for 19th-century American dentist Corydon Palmer from Warren, Ohio. Despite the adoption of the FDI World Dental Federation notation (ISO 3950) in most of the world and by the World Health Organization, the Palmer notation continued to be the overwhelmingly preferred method used by orthodontists, dental…

Key takeaways

Palmer notation belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Palmer notation to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Palmer notation from memory before moving on to harder problems.

Reference excerpt

Palmer notation (sometimes called the military system) is a dental notation system (tooth numbering system) named for 19th-century American dentist Corydon Palmer from Warren, Ohio. Despite the adoption of the FDI World Dental Federation notation (ISO 3950) in most of the world and by the World Health Organization, the Palmer notation continued to be the overwhelmingly preferred method used by orthodontists, dental students and practitioners in the United Kingdom as of 1998. The notation was originally termed the Zsigmondy system after Hungarian dentist Adolf Zsigmondy, who developed the idea in 1861 using a Zsigmondy cross to record quadrants of tooth positions. Adult teeth were numbered 1 to 8, and the child primary dentition (also called deciduous, milk or baby teeth) were depicted with a quadrant grid using Roman numerals I, II, III, IV, V to number the teeth from the midline. Palmer changed this to A, B, C, D, E, which made it less confusing and less prone to errors in interpretation. The Palmer notation consists of a symbol (⏌⎿ ⏋⎾) designating in which quadrant the tooth is found and a number indicating the position from the midline. Adult teeth are numbered 1 to 8, with deciduous (baby) teeth indicated by a letter A to E. Hence the left and right maxillary central incisor would have the same number, "1", but the right one would have the symbol "⏌" underneath it, while the left one would have "⎿".

Table of codes Orientation of the chart is traditionally "dentist's view", i.e. patient's right corresponds to notation chart left. The designations "left" and "right" on the chart, however, nonetheless correspond to the patient's left and right, respectively.

One advantage of Palmer notation is that it can produce a very graphical image, akin to a 'map' of the dentition; tooth transpositions or edentulous spaces can easily be depicted if desired. It would also be feasible to introduce additional alphabetic characters or other symbols, for example to denote supernumerary teeth or bridge pontics, to which a purely numerical method such as the FDI system does not lend itself easily.

Computerization With the move from written dental notes to electronic records, some difficulty in reproducing the symbols has been encountered. On a standard keyboard 'slash' and 'backslash' may be used as a crude approximation to the symbols with numbers placed before or afterwards; hence 3/ is 3⏌ and /5 is ⎾5. The Miscellaneous Technical block in Unicode provides Palmer notation symbols in U+23BE through U+23CC. The symbols are not to be confused with box-drawing characters (┘└ ┐┌), which have the horizontal line at the middle. These symbols are inherited from JIS X 0213 Dentist symbols. Daniel Johnson has put together a Palmer Tooth Notation TrueType font called FreePalmer. It is covered by the GPL 3 license. This font is descended from FreeSans. It can be used in OpenOffice and other software. A "MP7" derivative which enables the grid patterns to be produced that correspond to handwritten Palmer tooth notations is available for download as well. The FreePalmer characters are placed in the Latin-1 part, overriding existing characters. A more technically correct way would be to program orthographic ligatures into the font.

Victor Haderup notation (Danish variant) The Danish dentist Victor Haderup devised a variation of the Palmer notation where the (⏌⎿ ⏋⎾) symbols are replaced by plus/minus signs, which can either be placed in front or behind the number. A plus (+) indicates upper position while minus (−) indicates lower. When the sign is in front of the number, it indicates left while after it indicates right. For instance −6 indicates the 6th lower left tooth, i.e. first mandibular molar.

See also Dental notation FDI World Dental Federation notation Universal numbering system

References

Sources Bunn S (19 May 2006). "Tooth Numbering". Retrieved 2010-04-21.

External links Palmer numbering system video demonstration

Illustrations

Worked examples

Example 1 — a first encounter with Palmer notation

Start with the simplest possible case. Write down what Palmer notation claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Palmer notation before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Palmer notation ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Palmer notation

In research: Palmer notation appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Palmer notation in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Palmer notation is common in secondary-school and first-year university syllabi. It links to neighbouring topics Dentistry terminology, Human mouth anatomy, so understanding it makes those chapters shorter.
In everyday life: Look for Palmer notation outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Palmer notation in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Palmer notation means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Palmer notation out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Palmer notation in simple terms?

Why does Palmer notation matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Palmer notation?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Palmer notation.