 Hello everyone, welcome back to another session in dentistry and world today's topic is tooth numbering system We have basically three numbering systems, which is commonly used to there are many Tooth numbering systems are available what we are commonly used three systems, but most Accepted one is FDA system So Let's see the three systems of tooth numbering So as we all know we have 20 teeth in deciduous rendition and 32 teeth in Permanent rendition so we have additional 12 teeth in permanent rendition because we don't have Premolars in deciduous rendition so we have two primolars that is these two are primolars So we have two primolars in one quadrant. We say it is quadrant because it is part of a four segment Okay, so that is what it is known as quadrant So we have two teeth. This is a quadrant. So we have Four segments one two three four. So this is a quadrant. This is a quadrant. This is a quadrant This is a quadrant. This is upper right. This is upper left. This is Lower left and lower right. So you always View as a patient. So if this is a patient's mouth, this will be patients, right? This will be patients left and this is a lower teeth and this is upper teeth So I was talking about the difference in teeth number that is 20 in deciduous and 32 in permanent So the 12 teeth are additional that is a primolars These two primolars on one quadrant. So we have four quadrant. So eight additional teeth, okay But we need 12 additional teeth. Okay, so where is that? Four additional teeth which is the third molar. Okay, so the third molar This is a third molar Which is not present in deciduous teeth. So all the third molars are added. So it is four. So One two three. So three teeth are additional in one quadrant. So we have four quadrant So 12 teeth four into three 12. So we have 12 additional teeth in permanent dentition So the chord is icm. This is icpm. So this is i for incisors. This is canine. This is molars incisors canine primolars and molars So we have two incisors One canine and two molars. Okay, so upper we have Two incisors one canine two molars. So five in one quadrant. So 10 in upper arch or maxillary arch Five in one quadrant. So 10 in lower arch or mandibular arch total 20 Similarly in permanent dentition, we have two incisors one canine troop Premolars and three molars. So it makes eight teeth in one quadrant 16 teeth in upper arch or maxillary arch Eight teeth in one quadrant 16 teeth in lower arch Or mandibular arch and total 32 teeth in Permanent dentition, okay So that is just introduction part and there are lots of differences between deciduous and permanent dentition That will be dealt in next session. So let's see three systems of tooth numbering So the common one is universal system. So it is just using alphabets in deciduous dentition and numbers in permanent dentition. So it starts from upper right quadrant So a b c d e It stops here. That is upper right quadrant is over then upper left quadrant. So it continues f g h i j So it stops there upper left. Now we are into lower left quadrant. Okay This is lower left This is lower right. So it just continues like this. Okay a b c d e f g h i j k l m and o p q r s d So in what quadrant we have five teeth. So it just continues just continues continuous So we have 20 alphabets starting from a ending three. Okay. So a to e is the Upper right second deciduous molar. This is the upper Central incisor right central incisor f is upper left central incisor o is lower left central incisor p is lower right Central incisor t is lower right second molar So let's see the universal system in permanent dentition. It's using the numbers. It starts from 1 and it ending 32 so 1 to 8 is upper right quadrant 9 to 16 is upper left quadrant 17 to 24 is lower left quadrant And 25 to 32 is Lower right quadrant. So this is the upper right third molar. This is upper right central incisor 8 9 is Upper left central incisor 16 is upper left third molar 24 is lower left central incisor And 25 is lower right central incisor 32 is Lower right third molar. So I'm just Saying all the edge teeth. So we can say 7 is right lateral incisor upper right lateral incisor if 23 is lower left lateral incisor 28 is lower right First premolar and 30 is lower right First molar and next we have Zygmondi Parma system which was introduced by this scientist So here it is a different way. We are not using entire alphabets. We are just using 5 alphabets in deciduous dentition and 8 Digits that is 1 to 8 in permanent dentition. We are just using the quadrant. Okay. So this is the upper right quadrant And this is the upper left quadrant. This is the Lower left quadrant. This is the lower right quadrant. Okay. So we are just using quadrant symbols So if it is this simple, it is upper right central incisor And if it is like this, this is lower right canine, okay if it is like This this is upper left first molar. Okay. So this A is central incisor B is lateral incisor C is canine D is first molar E is second molar just changing the quadrant here But it is different A is first mo second molar B is First molar C is canine D is lateral incisor E is central incisor And it changes F is central incisor G is lateral H is canine I is first molar J is second molar So similarly in universal system also it changes So similarly in permanent dentition. So it is starting from 1 to 8 1 is central incisor 2 is lateral incisor 3 is canine first premolar second premolar First molar second molar and third molar only thing it We need to think about the quadrant. Okay So this is upper right second molar. This is upper left first molar. This is Lower left central incisor. This is lower right canine. Okay. So it is changing based on the Quadrant but all the teeth has In one quadrant has same number. So one means it is central incisor two is lateral incisor Three is canine eight is third molar But it is not like that in universal system. Every tooth has different Denotation here all the sets of teeth has same denotation only change is a quadrant. Okay. So that is Zygmondi-Pama system So universal system is very rarely used Zygmondi system Which is not very commonly used but it is very easy to use. It is Practiced in our clinical practice when we are writing but it is not officially used system The most accepted and officially used system in academic side is FTI system So here are these changes here. It is also known as two-digit system. Okay two digit. We are using two digit. Okay So here you can see that There are two letters for each tooth That is five one seven four Six three like that here also one five four six three three two four So the thing is the tooth numbering is same that is one is for Central two is for lateral three is for canine four first premolar five second premola six first molar seven second molar eight Third molar the only change is the quadrant Is denoted by The symbol here, but it is denoted by the number. So we have Four quadrants, which is denoted by one two three four in permanent teeth One means upper right two means upper left three is lower left four is lower right Similarly in deciduous it has become five seven five six seven eight five is upper right Six is upper left seven is lower left Eight is lower right. So five one means it is the upper right Central incisor eight four means lower right For smaller seven four means lower left for smaller six five is lower upper left second molar One seven means upper right second molar three four means lower left first premolar So this is a commonly used system in our academic side. So we should follow this fda system Or fda system or two digit system. Okay. So only Change from Zygmondi Palmer system is instead of this Quadrant simple we are using numbers to indicate the quadrant that is one two three four in permanent condition and five six seven eight in Deciduous condition. So that is a very simple Session but it is little tricky to understand the concept But once it is very clear it is easy to practice So universal system Zygmondi Palmer system and fda system universal system is just going through the letters and numbers Starting from a to t one to 32. This is quadrant a to e and 128 but using the Quadrant simple what fda system or two digit system just put forward by federation dentaire international a Which is using two digit the first digit is of the quadrant and second digit is a tooth number So I'll come up with the difference between deciduous on permanent condition and my next session. Thank you