 Hello everyone, welcome back to another session in dentistry and more so in dental anatomy We need to learn 16 teeth anatomy that is from central incisor to third molar. So eight teeth will be coming in maxilla and Similarly eight teeth will be in Mantable so this is central incisor lateral incisor can I first premola second premola first mola second mola and third molar? So the maxilla and mandible they are entirely different in size and morphology So all teeth are important. So any teeth can be asked as a long essay in university Dental anatomy paper. So we are starting with maxillary central incisor. So as you see the picture here Which is sent down in the maxilla one on either side of median line with missile surface of each in contact with missile surface of The other tooth their twin number, which is larger than the lateral incisor So these teeth supplement each other in function and they are similar anatomically So major function is to punch and cut food material during the process of mastication It has incisal edge or ridge and it is not like cusps which are found on the posterior teeth such as carine and Premola smallus it is having incisal edge or ridge So this is maxillary central incisor and And its system so we have basically three numbering system that is universal system then Zygmondi Palmer system and the third one which is well accepted or Currently using FDA system so in universal system Which is 8 or 9 so it starts from 1 here 16 17 32 just goes like this So 8 and 9 is the right central incisor and left central incisor But as a Zygmondi Palmer system, it is having quadrant System that is one and one so it just mentioned as one one So in clinical scenario, we might have seen this one. So this is Zygmondi Palmer system Instead of 32 it just divide into quadrant and this shows the various Quadrant, okay, whereas the FDA system that is a two-digit system, which is known as one one and two one because the first Letter indicates a quadrant. So this is the first quadrant second quadrant third quadrant and fourth quadrant Next one is a number so that we have one to eight So one one means the first quadrant and the first tooth that is a central incisor So this is two one. So the first number is a second quadrant and the first two that is a central incisor So that is a tooth numbering system of maxLAV central incisors So the dimension average dimension in millimeter the crown length is around 10.5 millimeter root length is 13 millimeter meso distilled dimension is 8.5 and The same meso distilled dimension at cervical in line is litter lesser than the Crown that is 7 millimeter then the labial ingle Diameter is again 7 labial ingle diameter of cervical line is 6 millimeter and Chronology the first evidence of calcification is that 3 to 4 months that is the first Calcification starts it is very early than eruption and crown completion by 4 to 5 years So after count completion there will be eruption that is after 2 to 3 years That is 7 to 8 years it erupts into oral cavity, but still root completion takes more time So it erupts into oral cavity by 7 8 7 to 8 years, but root completion by 10 to 11 years So it takes another 2 to 3 years So crown completed by 4 to 5 years So you can see then it erupts into oral cavity then the root completion Happens. Okay, that is a chronology of maxLAV central incisors Now we'll learn each aspect the first we have labial aspect We have five aspect that is labial, lingual, mesial, distal and incisal So labial aspect of crown so labial surface of crown is usually convex especially towards cervical third and some Central incisors are flat at midline incisal portion The mesial outline of crown is slightly convex with a crest of curvature that is representing the contact area Approaching the mesial incisal angle. So it's a mesial incisal angle and Distal outline as you see the picture here, which is more convex than the mesial outline with a crest of curvature That is a contact point higher towards the cervical line. Okay, this is towards the incisal edge this is towards the cervical line and The distal incisal angle is not as sharp as mesial incisal angle. Mesial incisal angle is very sharp. This is a little curved and incisal outline is usually regular and straight in a mesial direction so crown length is greater at center than a two mesial angle and Cervical outline of the crown follows a semi circular direction, which the with the curvature through twice So there will be developmental depressions present that is two straight developmental depression and shallow depression which is Extend from incisal edge towards the ginger wall and fade out in the middle third and Implication lines. Implication lines are faint. So first thing we learned Developmental depression. Okay developmental Depression so each can be a short note Now we have Implication line So implication line as you see here It is a faint curved lines which roughly parallel the seizure in cervical sort of surface and will not be present always And the height of contour the height of contour of the label surface is located at the cervical third Now we have the lingual aspect lingual aspect has more features The lingual outline is a reverse of that found on the label aspect lingual aspect has convexities and a concavity The outline of the cervical line is similar But immediately below the cervical line there is a smooth convexity which is known as Singular which is very commonly as short note So between the marginal ridges below the singulum there is a shallow concavity which is known as lingual fossa Can see the lingual fossa here the singulum and marginal ridges So lingual fossa is bordered by measly by the measly margin rich in sizely by the lingual portion of incisal rich distally by the distal margin rich and Surveillance by the singulum and developmental groups extending from the singulum into the lingual fossa Now we have the measly aspect In measly aspect as you see here crown is weight-shaped or triangular with base of triangular Servix and apex at incisal rich So a line drawn through the crown and root from measly aspect through the center of tooth Will bisect the apex of root and incisal ridge of the crown as you see a Line drawn which will be bisect the tooth Now the lingual outline As you see here the convex that is a crest of curvature at singulum then Concave at middle portion and slightly convex at lingual incisal ridge. So this is going like this okay Now cervical line the cervical line which is measly on maxillary central incisor Curves incisally to an noticeable degree Now the distal aspect it is a fourth Aspect the distal surface closely resembles measly surface with following exception That is the distal surface is generally smaller than the measly surface That is how you identify the right-hand left Central incisor because of this incisor cervical dimension is shorter and distal surface is more convex incisor Ginja valley and cervical margin does not Curve as far incisally because it can contacts with the lateral incisor which is a smaller tooth and The curvature of cervical line Outlining the CJ is less in extent on the distal than the measly surface Now the last part is incisal Aspect so a view of the crown from this aspect super imposes it over the root entire So that the root is not visible so root will not be visible when you properly hold it and view from the incisal Aspect so label face of the crown is relatively broad and flat in comparison with the lingual surface That is especially towards incisal third and cervical portion of the crown Label is convex. Although the R described is broad Outline of the lingual portion tapers lingually towards a singulum then singulum of crown makes up the cervical portion of lingual surface So crown of this tooth Shows more bulk from incisal aspect than from measly or distal aspect. Okay So the labial lingual calibration of crown is more than two-third as great as mesia or distal calibration. So this is the Labial lingual and this is mesia or distal. So labial lingual calibration is more than two-third as great as Mesia or distal and the crown conforms to a triangular outline reflected by outline of the root cross-section at cervix Now the last part is root Now we learned the five aspect of crown now the root is single which is conical relatively straight and tapers to a rounded apex and Horizontal cross-section of root near cervical line shows a rounded triangular outline And normally the root is wider labial which is the base of the triangle and arrow at the lingual which is the apex So mid root cross-section usually reveals a somewhat avoid outline which is wider Labial lingually than mesia or distal Okay, so when you Write this for exam you need to draw Picture with proper dimension the dimension I mentioned how many centimeters it is so proper dimension You need to write and each aspect you can draw in a small box and explain the points So next video is about Maxillary lateral incisor be understood maxillary central incisor. So I'll come up with the lateral incisor in next video. Thank you