 Hello everyone, welcome back to another session on dentistry and more. So today's topic is curve of speed Curve of speed is nothing but a compensatory curve and balancing occlusion and it is put forward by anatomist further than speed in 1890 Which is a anterior posterior curve in a sagittal plane and it is viewed best on the Lateral side. So let's see what is curve of speed of speed is nothing but this red line It is an anatomical curve Established by the occlusion alignment of the teeth. So this occlusion alignment As projected onto the median plane beginning with the cusp tip of mantibular canine following the buckle cusp tips of premolars and molars Continuing through the anterior border of Continuing through the anterior border of ramus of mandible and ending to the anterior aspect of Mantibular Contile. So it is starting from Manipular canine Premolars, molars, anterior border of ramus of mandible and reaching to the anterior aspect of Mantibular Contile This arc of a curved plane that is tangent to incisal edges are and the buckle cusp tips of Mantibular Dendition viewed from a sagittal plane So when we view from a sagittal plane this arc is a curved plane and which is tangent to the incisal edges and Buckle cusp tips of Mantibular Dendition So that is curve of speed So it is an anterior posterior curvature of occlusion surface starting from the tips of lower cusp tips That is canine by cusp tips, molars, contiles and if this curvature extended it would reach a four inches Circle a diameter of four inches circle it would make So this was given by Ferdinand Spee and it is very much vital in balancing occlusion because if it is a steep contiler path Requires there should be a steep Compensating curve. So ideally we would require a flat mild curve of speed for an ideal Balanced occlusion. Why this compensatory curve or curve of space important because the anterior posterior lateral curves There are many curves incorporated during the artificial teeth arrangement during dental construction and these Curves are to compensate for something called as Christiansen's phenomena Christiansen's phenomena is nothing but when a flat occlusion scheme is given an Opening takes place in the posterior region Okay, when a flat occlusion scheme given an opening takes place in the posterior region during the protrusive moment So when the protrusive moment happens, there is an opening takes place in the posterior region of Mantibular So this opening is because of the effect of contour inclination So because of this contour inclination an opening takes place at the posterior part during the protrusive moment So the compensatory curve Are determined by the inclination of the posterior teeth and their vertical Relationship to the occlusion plane. So that is how we plan our compensatory curve So that it becomes in harmony with the movement of Mantibular Guided by the Contissuer path. So we need to Keep in mind that to avoid the Christiansen's phenomena the Curve should be in harmony with the movement of the condyles So this curve of speed has importance in Authorontics, prosodontics and even rasterity dentistry So this two-dimensional curve of speed which moves up or and from Antire to posterior direction And if it is measured at the deepest point near Primola region, it has one two one point five millimeter of concavity and That is an acceptable range So the concavity increases or deepens in deep pipe patient So if the deep bite is there this concavity of one to one point five millimeter increases and A flat reverse curve of speed a flat reverse curve of speed It is like this get a flat reverse curve of speed in Patience with open bite so This curve of speed is important in Balancing occlusion in prosodontics in orthodontics and even rasterity dentistry it should avoid the Christiansen's phenomenon and It will be very deep in deep pipe patient and the opposite will see an open bite patient. So creating an ideal or perfect curve of speed is very much important in Managing or creating a balanced occlusion So that is why this compensatory curve is important in occlusion So that's all about curve of speed It is Imaginary curve on sagittal plane starting from canine to Contile to make a perfect balanced occlusion. So I'll come up with a new session on dentistry and mode. Thank you