 Hello everyone welcome back to another session in industry and more today's topic in prosthodontics is neutral zone concept So neutral zone concept is nothing but a potential space in the oral cavity Where the force is from outside that is from the lips and cheeks and Forces from inside that is a tongue muscles will get neutralized So this should be the potential space for danger fabrication Where the muscles action from outside and inside are neutralized or there is no much effect? So that we can have a danger with good retention and stability So let's learn neutral zone in detail So as per definition given by GPT neutral zone Is a potential space between the lips and cheeks on one side and the tongue on the other? That area or position where the forces between the tongue and Cheeks or lips are equal or it get neutralized Okay, so this is a concept we apply in danger fabrication That it for each individual patient there exists a specific area within the Denture where the function of the musculature will not unseat the denture. Okay So when we create Fabricate a danger our ultimate aim is there should not be any hindrance By the muscles To the denture so we should make our danger in harmonious with the muscle action Otherwise, what happens the muscle action will dislodge the dislodge the denture or there will be moment of Danger that is it is affecting its retention When tongue movement happens, there will be dislodgement or lip movements or the cheek movements So the many muscles involving all these areas so The muscle action should be neutralized. So that area is known as neutral zone where the muscle action is equally Cancelled each other or it is a neutral song that is a potential space. Okay, so this is a Picture of our oral cavity. We have maxilla here. We have mandible here We have tongue here. We have the cheek muscles And The blank space is a potential danger space So this is the area where we are keeping our denture. Okay, so forces from inside that is by the tongue muscles And forces from outside that is why the lip muscles and cheek muscles are neutralized here in the neutral zone So this concept was first introduced by Wilfred fish. Okay, Wilfred fish in 1931 so he mentioned it as a dead space in Oral cavity. Okay, so this dead space later become neutral zone So he was the person He talked about neutral zone for the first time and he mentioned it as dead space So this complete denture it is primarily Mechanical devices. Okay So since they are functioning in the oral cavity, they must be In harmony with the normal neuromuscular function So like I said, it has many oral functions. It has to manage Oral functions such as speech mastication Swallowing smiling laughing all this involves various actions of tongue lip cheeks and floor of the mouth which All together makes very complex and highly Intuitive so we need to take in care of all these muscles all together to have a good retentive and stability Retentive denture with good stability. Okay, so our aim is to construct a denture in the neutral zone and This denture should be with harmony in The surrounding musculature that is from the lip muscles cheek muscles and with the tongue muscles So this neutral zone approach has been Used for patients who have highly atrophic mandible Trophic mandible then patients with any type of mandible or resection or nerve damage or patients with Glossectomy partial glossectomy In all these type of patients this neutral zone approach will be much effective because these patients would be having Unfavorable danger bearing areas so we need to Use the neutral zone approach for fabrication of dangers in these patients So if the danger is placed in the neutral zone It will be retained more effectively during functions, but if we keep our danger Outside the neutral zone. It will be unstable during the activities of talking so allowing amastication So that is a concept of neutral zone Where the muscular action is neutral? Okay? So I just want to highlight the concept of neutral zone Not going into the details of each step how we should perform So the concept is simple the neutral zone where the forces from outside and inside are get Balanced or it is neutral. Okay, we should keep our dentures for better retention and stability So that's all for now the concept of neutral zone. Hope you understood this concept It is commonly asked as a short note. You can write it in the long essay if it is asked as a complete danger concepts So I'll come up with a new topic in prosodontics. Thank you