 Hello everyone, welcome back to a new session on dentistry and more. Today's topic is denti-cherus cyst. So last class we have seen radicular cyst or periapical cyst. The second most common cyst after the radicular cyst is denti-cherus cyst. So let's see the details of denti-cherus cyst. Denti-cherus cyst, the name itself gives an idea about its origin that is denti-cherus. This means a germinal, so dental, tooth forming cells associated with a cyst is known as denti-cherus cyst. Exactly the enamel epithelium, we know reduced enamel epithelium which is the outermost covering when the tooth erupts into the oral cavity. So some malformation or some improper reaction happening with the reduced enamel epithelium creating a cyst which is known as denti-cherus cyst which is the second most common cyst after radicular or periapical cyst that is ordentogenic cyst. It is also known as follicular cyst because it creates a follicle above the tooth crown so it is also known as a follicular cyst. So usually these type of patients comes to the clinic with a swelling and an unerupted tooth. So there is a swelling associated with unerupted tooth. So you might keep a differential diagnosis of denti-cherus cyst. So that is a common symptom associated with this. So we will begin with there is an enclosure of part or all of the unerupted tooth in denti-cherus cyst. So a part or whole of the tooth just like this this is a whole of the tooth or part of tooth is enclosed by the cyst. So there is fluid accumulation between the reduced enamel epithelium and the enamel surface of unerupted or impacted tooth. So tooth is there. So as the tooth erupts into the oral cavity this reduced enamel epithelium supposed to move away but what happens is there is some reaction happening fluid is getting accumulated between this tooth crown that is enamel and the reduced enamel epithelium and creating a cyst that is a fluid accumulation. So it is basically from dental follicle. Moving on to the clinical features it is most commonly seen between first, second and third decade. There is no gender predilection it is commonly seen equally distributed males and female are equally affected but it is most commonly mandibular areas are affected compared to maxilla. 70 percentage cases are reported in mandible compared to the maxilla where it is 30 percentage. So the mandible it is most commonly the ankle of mandible then canine regions. So maxillary and mandibular canine regions are affected after that maxillary third molar area. The most common site is ankle of mandible and least common site is maxillary third molar area. It is usually a painless condition or a painless cyst but it become painful when there is a secondary infection and it is a aggressive lesion it grows in a aggressive nature. There will be bone expansion and facial asymmetry because it is affecting mostly the mandibular posterior region tooth remain uninterrupted that is the thing because it is the cyst is over the tooth crown connecting the cemento enamel junctions are a part of tooth. So tooth will be most of the time uneruptured. So how this happening pathogenesis? So first there will be cystic changes in the remnants of enamel organ. So it encloses the crown of an uninterrupted tooth which is attached to cemento enamel junction. So what happens there is expansion of follicle when fluid collects or the space is created between the reduced enamel epithelium surrounding and developing tooth which degenerates. So when erupting tooth compress the tooth follicle which obstructs venous outflow which induces serum to cross through the capillary wall. So that is just the process which is happening so it is a very simple process tooth erupts into the oral cavity. So when a tooth erupts this reduced enamel epithelium should move away and the tooth erupts. But what happens here here the tooth with reduced enamel epithelium is not moving away there is collection of fluid is happening between this reduced enamel epithelium and the developing tooth. So there will be expansion of this follicle and fluid will be collected between this space and later cystic changes happening and it becomes a proper cyst. In radiographic features it will be just like any cyst well defined radiolusin area it can be uni or multi-locular it covers entire crown of uninterrupted tooth and in radiographic way it expands three direction one is it can be circumferential or lateral or coronal. So these three types of growth can happen or it can be seen in radiographic feature it is not easy to see these three ways of expansion in a clinical setup so we need to make this more clearer by using a radiograph. In histologic features there is a cystic lining which is composed of reduced enamel epithelium and there will be occasional caracanization by metaplesia and inflammatory cells chronic inflammatory cells will be there if it is infected. So that is about histologic features and we can do investigation using a OPG and CT scan IOPA can be taken and biopsy should be taken to get a clear picture about this dentistry cyst and treatment options we have enucleation, marsupialization or a combination of enucleation and marsupialization and also a curatage associated with enucleation also can be performed in dentistry cyst treatment modality. So that is all about dentistry cyst or follicular cyst. So let us see the OKC that is ordentogenic keratocyst next session. Thank you.