 Hello everyone, welcome back to another session in dentistry and more. So we are continuing our dental anatomy sessions. So last session we finished maxillary canine. This session is about mandibular canine. After that we will move on to the premola section. We are suddenly jumping to mandibular canine just because studying canines together is easy because many features are common. So we will start with mandibular canine. First the tooth numbering system. We have three system which are there. One is the universal, then comes Zygmunti Parma system, then the FT system. So I am not drawing again and again so hope you know the system very well. So in universal the number is 22 and 27. So it will come here 22 and 26, 27. So we are talking about mandibular canine. Now the Zygmunti system we know it will come like this and FT system is 3, 3 and 4, 3. This is the quadrant and this is the tooth. Now the chronology. Chronology, the first evidence of calcification it is 4 to 5 months enamel completed at 6 to 7 years, eruption by 9 to 10 years and root completion by 12 to 14 years. And the dimension as you see here. So the crown length is 11 millimeter, root length is 16 millimeter, visu distilled diameter at contact area is 7 and its cervix is 5.5 and labilingule is 7.5 and 7, one is at contact area and one is at the cervical line. And the curvature of cervical line is easily 2.5 and distilled it is 1. Now we have the various surface that is the labile aspect. So labile aspect mandibular canines are similar to maxillary canines except that they are slightly narrower, visu distilled. You can see it is smaller comparatively smaller than the maxillary canine. And next feature is mesial outline of the crown is straight and in line with the mesial outline of the root, you can see it is in line with the mesial outline of the root also. Whereas the maxillary canine it is the crown is little bulkier so it won't come in the same line. And the mesial cusp ridge is smaller than the distal cusp ridge. The mesial outline is straight and obtuse mesial incisal ankle whereas the distal outline is convex and rounder distal incisal ankle. The incisal aspect it is not sharp as maxillary canine. Now the lingual aspect, lingual aspect the mesial distal and incisal outlines these margins mimic those of the labile aspect and singulum is less prominent and marginal ridges are less distinct whereas the maxillary canine the singulum, lingual forza and all those margins are very prominent and very distinct. So here it is not very distinct and not prominent. So we don't have much features in mandible canine lingual area and the mesial and distal aspect also. So these aspects are very similar and the cervical line curves more on the mesial aspect. So I mentioned repeatedly, mesially it is more curvature than the distal one. And the contact area on the mesial aspect is in the incisal third and little higher that is a more cervical on the distal third. So there are some common rules for all the teeth because on the mesial side it is more towards the incisal and on the distal side it more towards the cervical. And the incisal aspect just like maxillary canine the labile lingual dimension is more than the mesial distal dimension. And the cusp tape appears inclined in a lingual direction. And finally the root. The root is shorter by 1 or 2 mm than the maxillary canine. Maxillary canine has around 17 mm so longest root and this is around 1 or 2 mm that is around 16 mm. And the developmental depression is more pronounced on the lower canine than maxillary canine. Okay, so that is all about mantibular canine. It is very shorter video but it has got features but you need to compare it with the maxillary canine. Sometimes question might come as compare maxillary and mantibular canine. So that is why I have taken mantibular canine just after maxillary canine before moving to primolus. So hope you understood this. Again I am telling you when you are writing this any question of tooth anatomy you need to start with some general introduction. Just like cornerstone of maxillary tooth and its basic functions then the chronology then dimensions then start with the diagrams on each aspect and stop with the root. Okay so I will come up with maxillary first primolar in my next video. Thank you.