 Hello everyone welcome back to another session in dentistry and more so we are continuing our dental anatomy sessions last session was about maxillary central incisor now we have maxillary lateral incisor there are two in number maxillary central incisor is present on the mesial side and canines present on the distal sides so basic functions are shearing or cutting foot speech and support for lips supplement central incisor in function and are similar anatomically now the tooth numbering we have three system as we learned in our last session universal zygmuntiparma system and the accepted FDA system so by now hope you are well versed with this system so I will just tell the numbers 7 and 10 because this is going 8 9 16 17 24 25 and 32 so our lateral incisor will come here that is 7 and 10 this is in the universal system whereas the zygmunti system it is like this and FDA system this one two and two two this represent the quadrant and this is the tooth okay one two three four five six seven eight so two is a lateral incisor and chronology as you see her first evidence of calcification is 10 to 12 months then completion of enamel by 4 to 5 years the eruption by 8 to 9 years and the road completion by 11 years so this is first evidence of calcification then crown is completed then irreps and finally the root completion okay so all the reasons why the time gap is I mentioned in the last video so you need to study first central then lateral then can I in that order then it will be very easy don't pick up one tooth and study you have to start from central till maxillary third molar and the dimensions the cervical incisor length is 9 mm the length of route is 13 mm mesiodistral diameter is 6.5 mesiodistral diameter of crown at cervix is 5 then the labia buccal diameter is 6 and the same at cervix is 5 and the curvature of cervical line measly is 3 that is very deep and on distal it is less it is 2 mm now we'll start with the labial aspect the labial aspect crown outline is trapezoid mesial margin is approximately similar to maxillary central incisor the height of contour on the mesial margin it is near to junction of incisal and middle third and distal margin it is more rounded than maxillary central incisor and mesio incisal and distal incisal line angles are more rounded than maxillary central incisor so that is why i'm saying don't pick up one tooth and study the next one you should start from central incisor then comes to lateral then you can easily compare and study the incisal outline is similar to maxillary central incisor but it is not straight and the crest of curvature on the labial aspect is at the cervical third now we have the lingual aspect lingual aspect the mesial margin is more convex than maxillary central incisor and distal margin is more rounded than maxillary central incisor and lingual forza which is deep triangular shaped um occupies two-third of the lingual surface of crown so once you study maxillary central incisor very detailed the remaining teeth will be very easy because all the terminologies and all the newer new words you will get very easy to understand okay so the lingual forza and the singulum all we have already studied in maxillary central incisor so it is very easy to understand and the singulum is limited to cervical third so you can see the picture here cervical line the v-shaped forza singulum in the cervical third and lingual pit present on the point of v and there is lingo gentrival groove which emanates from lingual pit usually on the distal side and may extend over the cemento enamel junction so you can see the singulum lingo gentrival groove lingual forza distal marginal ridge mesial marginal ridge incisal edge the pit and lingo gentrival fissure the marginal ridges and singulum are more prominent than central incisor the forza will be rounded at the mesio marginal ridge which is straight and longer whereas a distal marginal ridge will be slightly curved and small root is narrower now we have the mesial aspect which is very similar to central incisor with uh less than dimension because the tooth is a little smaller than central so curvature of the cervical line is marked in the direction of incisal ridge and contact area incisal third very near to junction of incisal and middle third it is similar to uh in shape to contact with the maxillary central incisor because a maxillary central incisor contact areas in that uh part of tooth and root appears as tapered con with blindly rounded apical end if a line drawn through center of the root tends to bisect the incisal ridge of the crown and proximal contact and junction of incisal third near the junction of incisal and middle third whereas a distal aspect distal surface is smaller and more convex in all dimension than mesial surface the curvature of cervical line is usually a millimeter or so less in depth than on the mesial side the curvature is less deeper and proximal contact junction of incisal and middle third and lastly we have the incisal aspect so it almost resembles central incisor more or less avoid in form singular may be large as is incisal and labial lingual dimension may be greater than usual in comparison with the mesiodistral dimension and it exhibit more convexity labially and clinically from incisal aspect than maxillary central incisor the mesiolabial and the distal labial line angle are much more rounded so we are talking about incisal aspect so lobs of labial surface are less clearly demarcated in lateral incisor because of high degree of convexity of labial surface because of this high degree of convexity the lobs are less clearly demarcated so sometimes a question might come compare maxillary central incisor and lateral incisor so you need to compare with respect to each aspect so the maxillary central incisor and lateral incisor on the labial aspect with regard to the mesio incisal angle distal incisal angle they are sharp in central but slightly rounded and distinctly rounded in lateral the mesial profile is straight but slightly rounded in lateral the distal profile is round and highly rounded in lateral and the contact area the mesial contact on incisal third on central it is on the incisal and middle third on lateral distal contact on the junction of incisal and middle third but in lateral it is on the middle third labial surface is relatively flat in central but it is round in lateral incisor then lingual aspect the marginal ridges and singulum lingual fossa they are moderately pronounced and moderately deep but more prominent and deep in lateral incisor on the mesial aspect cj it is moderately curved in lateral it is less curved contact area is at incisal third lateral it is at the junction of incisal and middle third singulum it is moderately convex lateral it is convex and incisal aspect outline is triangular in central avoid in lateral labial surface is slightly convex in lateral it is highly convex lobs it is visible labially but slightly visible and mesial and distal labial angles they are prominent here but it is rounded here so it is a very commonly asked question to differentiate maxillary central incisor and lateral incisor you need to write all these points that is why I was repeating each line all these points you need to write that is the labial aspect lingual aspect mesial and distal and incisal aspect sometimes question might come like maxillary lateral incisor and mantibular lateral incisor so anyway we are going to study about mantibular lateral incisor but still maxillary lateral incisor has rectangular and broad account but mantibular it is long and narrow or mesiodistally so you can imagine mantibular is very small crown or small tooth in maxillary it is the mesial and distal outline is convex but it is almost straight in mantibular and the line angles are rounded in maxilla it is straight and sharp in mantibular prominent marginal ridge in maxilla and less prominent marginal ridge in mantibular lateral incisor fossa is almost d-pan v-shaped but there is no fossa on mantibular lateral incisor more prominent singular form maxillary lateral incisor and less prominent singular form mantibular lateral incisor so it is a commonly asked question difference between maxillary lateral and mantibular lateral or the maxillary central and maxillary lateral so you need to write in all the aspect level or the maxilla and mantibular you can easily make out the difference okay so next we have the maxillary canine so make sure that you learn maxillary central incisor properly then it will be very easy to learn maxillary lateral incisor so i'll come up with maxillary canine in my next session thank you