 Hello everyone, welcome back to another session in dentistry and more. So we are continuing our dental anatomy sessions So today's session is about maxillary second premolar. So far we finished maxillary central lateral canine first premolar and mantibulock So we have three systems of tooth numbering in universal system the right second maxillary premolar will be four and And The left second premolar will be 13 Okay, so this is central lateral canine first premolar second premolar first second third molar central lateral canine First premolar second premolar first second third molar in sigmondi power system. It will be five Because it starts like one two eight Central lateral canine first premolar second premolar on both side. So it will be just like this an FDA system it will be 15 and 25. Okay, so the one and two is a quadrant and five is a Tooth number in each quadrant. Now we have the chronology that is the first evidence of calcification it is two to Two and a half years then enamel completed at around six to seven years then eruption by 10 to 12 years and root completion by 12 to 14 years and The dimension of tooth it is 8.5 millimeter crown length 14 Root length then mesiodistral diameter of crown is seven and it is five at the cervix and the bucklingle diameter is at eight nine sorry nine and eight at cervix and The mesial curvature line is one mm and the distal one is zero. So we'll start with the buckle aspect So as you see here the outline is almost like a trapezoidal With the mesial outline is slightly convex whereas a distal one is more convex and cusp is shorter one with less pointed and The mesial slope of the cusp is shorter than the distal slope and tip is as you can see here the tip is displaced to the mesial side and The contact areas are at mesial it is at the junction between middle and occlusal one-third and the distal is At the middle of middle one-third and there is a buckle and cervical ridges the cervical line is convex in regard to the root and The root is a single tapering from cervical to apical with a distal curved apex Regarding the lingual aspect the lingual convergence is there and there is reversed outline with respect to mesial and distal and And lingual cusp is sharp and it is almost same length as the buckle cusp now the mesial aspect the Outline is trapezoidal The buckle and lingual are slightly convex and cusps are almost same length and There is greater distance between the cusp which widened the occlusal surface because it is a posterior teeth and the crest of curvature on the buckle side it is at the junction between middle and cervical and On the lingual side it is at the middle of the middle one-third On the buckle side it is at the junction between middle and cervical one-third on the lingual side it is at the middle of middle one-third and The aspect is a little bit convex and smooth with no depressions and Mesial marginal ridge is more Occlusively present than the distal marginal ridge just like any other teeth and the cervical line is concave with respect to the root Regarding the root from the mesial side It is single broad bakulinguli with relatively blunt apex and there is a shallow developmental depression On the distal aspect it is almost similar to the mesial aspect the distal contact area is wider and more cervical And distal marginal ridge is more cervical The straighter cervical line is present compared to the mesial one and there is a deeper developmental depression Whereas the occlusal aspect the oval or round shaped symmetry there is cusps both at the same size with wide distance in between them and Marginal edges, they are thick strong and well developed There is presence of central groove which is shot with multiple Supplemental grooves and there is two triangular foeza which is near to each other Distal triangular foeza is larger than the larger and deeper than mesial triangular foeza Now we need to study the comparison with maxillary first and second primolar on the bakal aspect on the bakal aspect On the mesial side the outline is concave and distal is less concave here Whereas the second primolar mesial is slightly convex and distal is more convex and Mesial slope is larger than the distal one tip is displaced to distal Mesial slope is shorter than the distal tip is displaced to mesial side Contact area on the first primolar mesial just occlusal to the middle of the middle one third and distal at the junction between middle and occlusal one third on the second primolar Mesial at the junction between middle and occlusal one third whereas a distal at the middle of middle one third From the lingual aspect on the first primolar it is shorter than 1 mm Buckle but 1 mm shorter than the buckle one But it is same as the buckle on the second primolar on the first primolar the lingual cusp is sharp although the whole lingual surface is convex and the second primolar the Cusp is sharp On the mesial aspect to regard to first primolar There is canine foeza Mesial marginal developmental groove is there Here the smooth end convex with no depression With regard to root bifurcation level is at mid root Here it is only single and broad root That is developmental depression in both cases On the distal aspect there is no canine foeza here. There is no mesial marginal developmental groove But on the second primolar It is almost similar to mesial aspect to regard to root The bifurcation level at the apical one third on the first and There is deeper developmental depression present on the second primolar and the occlusal aspect first primolar Outline is hexagonal and Second primolar it is more oval or rounded and the cusp buckle and lingual cusp Same in both cases marginal adjusts are thicker ones in second primolar the depression In first primolar we have long central groove here. We have short central groove Then the mesial marginal developmental groove is there There is supplemental Grooves are present on second primolar to triangle foeza In both the cases So that is the comparison between maxillary first and second primolar very commonly asked Short essay the difference between maxillary first and second primolar That's all about The maxillary second primolar next session will be about the maxillary more less That is for second and third molas. So I'll come up with maxillary first molar. Thank you