 Hello everyone, welcome back to another session in dentistry and more. So today we have a very easy topic that is the basic difference between primary dentition and permanent dentition. So primary dentition which is also known as deciduous dentition, milk teeth, baby teeth and temporary teeth. So let us see the difference between these two dentitions. So we all know the deciduous dentition or primary dentition which starts by 6 months that is the first tooth erupts into oral cavity which is the mantibular or the lower central incisors. Then it goes on erupting up to the second molars. By 2 years most of the teeth will be erupted that is around 20 teeth will be erupted whereas in permanent dentition it starts by 6 year that is again the lower central incisor will be erupted by 5 to 6 year. It varies based on the gender and individual to individual it may vary. So that is the eruption duration that is 6 months to 2 years this is 6 to 21 years. So the last tooth which is erupting in permanent dentition is third molars that also varies person to person it may erupt as soon as 17 years or it may delay up to 22-23 years. So let us see the difference between these two before that we need to divide our dentition into primary dentition mixed dentition and permanent dentition. So primary dentition is exclusively the teeth as only primary dentition that is 6 months to 6 years by 6 years the permanent dentition starts erupting. So till 12 years the person will be having both deciduous and permanent dentition that is between 6 to 12 years. So around 12 to 13 years most of the deciduous dentition will be exfoliated and the person will be having only permanent dentition that is 12 years onwards. So we have primary dentition that is 6 months to 6 years mixed dentition 6 to 12 years and permanent dentition that is after 12 years. It is not exactly 12 6 and 6 months it may vary person to person age, gender variations will be there. So let us see the difference between primary and permanent dentition. So as I mentioned it starts from 6 months to 2 years it starts from 6 years to 21 years. We have 20 teeth in primary dentition whereas the permanent teeth is 32 in number. So we know we have 4 categories of teeth that is we have incisors, we have canine, premolars, no premolars in deciduous we have molars. Here we have incisors, canine, premolars and molars. So incisors is 8, this is 4, this is again 8. So total 20 teeth, here it is different incisors is again 8, canine is 4 whereas premolars is 8 and molars is 12. So each quadrant we need to divide by 4. So each quadrant there will be 2 incisors, 1 canine and 2 molars. Here each quadrant there will be 2 incisors, 1 canine, 2 premolars and 3 molars. That is how it is coming 20 and 32 teeth in deciduous and permanent teeth. And regarding the crowns, in deciduous or primary dentition the crowns are very short whereas the permanent dentition has bigger crowns as you can imagine in kids mouth small crowns whereas adult mouths the crowns are bigger which has narrow occlusion table in primary dentition whereas bigger occlusion table in adult dentition. And the cervical region there will be a constriction in primary dentition. So such constriction are not very marked or very evident in permanent dentition and thinner enamel and dentine in relation to primary whereas permanent dentition has thick enamel and thick dentine. So the direction of enamel towards in cervical third in primary dentition it is towards the occlusion side whereas in permanent dentition it is towards the gingerival side. And broader and flat contacts between the teeth whereas in permanent dentition it has point contacts that is between the teeth. The regarding the color the primary dentition is more whiter, lighter in color whereas the permanent dentition is more darker and slightly on yellowish side. In primary dentition the incisors which has no mamalones and no developmental groups in permanent dentition mamalones and developmental groups can be present. But in primary dentition there will be a meso buccal bulge that is at the cervical regions of molars will be prominent. So this type of meso buccal bulge on the cervical side will not be prominent in permanent dentition. And as I mentioned ICPM that is a code incisors canines primolars and molars. Two incisors one canine no primolars two molars two one two three that is two incisors one canine two primolars and three molars. So regarding the pulp the deciduous dentition has large pulp chamber the pulp horns are more closer to the outer surface so the treatment procedures there will be accidental pulp exposure because it has a bigger pulp chamber and it is very close to the outer surface of enamel and more cellularity and more vascularity so it is just opposite or just lesser in permanent dentition. Cellularity and vascularity is comparatively low and the pulp chambers are not very big and it is away from the outer to the surface and roots are larger and slender and smaller trunks whereas the roots are shorter and bulbous roots and it has larger trunk which is towards the apical direction where the trunk is towards the cervical region and the mesiodistral dimension of roots is narrower in primary dentition whereas it has a broader mesiodistral dimension. Physiologic resorption is seen only in primary dentition because it is a natural process the roots will be resolved and permanent dentition will be replaced. Such resorption is not seen in permanent dentition and inter globular dentine is absent in primary dentition whereas it is present in permanent dentition and there will not be much ginger whitish or recession which is periodontal problems mostly it is absent in primary dentition but it is very very evident and it is present in permanent dentition so this is some of the few examples so we can have tooth-wise comparison and each category like enamel, dentine, pulp, cement and periodontal ligament so I include most of the differences so this will most commonly asked a seclusion or sometimes a shorter knot or a very short knot so if it is asked as a seclusion you need to elaborate under enamel, dentine, pulp, cement and periodontal ligament, ginger, alveoli, all the subheadings you need to include that only you will get more marks so if it is a short knot or a very short knot like three marks or five marks you can write this making a table and write the important so this includes most of the characteristics but not very much in detail explanation is given so that is about the difference between primary dentition and permanent dentition so I will come up with a new topic in dentistry demo thank you