 Hello everyone, welcome back to a new video on dentistry and more so today's topic is functional matrix theory So that is the fourth theory in theories of growth We are covered genetic theory future theory and cartilaginous theory We have seen What causes growth and development in each theory The genetical involvement the future involvement and the cartilaginous involvement Now let's move on to a different concept that is functional matrix theory In functional matrix theory It is all about a functional cranial component Now let's see what is functional matrix hypothesis are also known as most functional matrix theory. It was given by Melvin most functional matrix theory it claims that the origin growth form position and maintenance of all skeletal tissues and organs are always secondary compensatory and obligatory responses to temporary and operationally prior events that occur in specifically related non skeletal tissues organs or functioning Spaces are also known as functional matrices So actually the main thing happens The structures which are related to these bonds The non skeletal tissues organs or functioning spaces are actually creating the growth So that is the concept of functional matrix theory The theory itself suggests that the organs the skeletal tissues are always secondary and compensatory responses happening because of the Events occur in the functional matrices which are non skeletal tissues It is a very different concept Put forward by Melvin most actually it was a work of vanter claw and later Melvin most modified this So this space are also known as functional matrices actually has two unit that is functional matrix and skeletal unit So in functional matrix does again we can divide this into capsular matrix and periosteal matrix So functional matrix is About a one function then cranial component This matrix and skeletal unit. So periosteal and capsule are matrices the periosteal matrices Actually it is Influences born directly it influences one. So this might be surrounding a bond and it directly influences that particular bond through periosteum and causing Born deposition and resorption So actually it is known as micro skeletal units So born growth is occurs by transformation. That is deposition and resorption So what are the periosteum? Matrices we can say that it could be a temporalis muscle. It could be a blood vessel It could be a gland which causing deposition and resorption of that particular bond and causing transformation growth changes This is known as micro skeletal units So born formation is by direct influences of this periosteum matrix So it could be temporalis muscle blood vessels or gland anything which surrounds the Particular bond and the next thing is capsular matters Capsular matters is nothing but which is a capsule surrounding a mass or space so it is a Thing which is covering a mass just like the dura matter and Scalp which covers the neural mass and orbit which covering the orbital tissues. So these are known as Capsular matrices So capsular matrix Which is a covering unit which actually forms the epigenetic growth factors which has epigenic growth factors which causes the Growth and it creates a Translational growth or it creates translational or volumetric changes and it is known as macro skeletal unit So macro skeletal unit the capsular matrices act upon the macro skeletal unit and causing translation The periosteum matrix which is acting upon the micro skeletal unit which is causing Transformation by bond deposition and resorption. So transformation and translation which ultimately results in growth So this is the basic concept of functional matrix theory So basically the totality of soft tissues Associated with a single function is termed as functional matrix So basically two distinct time types of functional matrices that is periosteum And capsular matrices periosteum matrices are already mentioned Before that functional cranial component functional cranial component is nothing but The function we were talking about Now it has two components that is functional matrix which is actually perform the functional Functional duty of a Bond and the skeletal unit which provides a bio mechanical role of protection and support to this functional matrix So the scranial component functional matrix is actually act as a matrix and the skeletal unit which provides support through a bio mechanical role So functional matrix are basically two types of capsular matrix and periosteum matrices So periosteum matrices influence bond through periosteum By direct deposition and resorption. It can be temporalis muscle, teeth, blood vessels, nerves and glands So periosteum matrices form the local environmental factors which affect the growth and The influence of periosteum matrices restricted to just a part of bond that is it affects the micro skeletal units, but whereas a capsular matrix Which includes a capsule that surrounds the masses and spaces just like neural masses containing the scalp and Dura matter and also orbital mass which is Supporting tissues of which has supporting tissues of eye Or or nasal pharyngeal spaces are surrounded by various tissues that form capsule Neurocranial capsular matrixes many matrices are there. So these matrices Coarse growth of a whole bone not a just a part of one the entire whole bone Through a volumetric expansion of capsular matrix It is creating a spatial translation of whole bone or macro skeletal unit so whole bone Formation or travolumetric expansion occurs by the effect of capsular Matrices now, let's see. What is a skeletal unit now? Let's see what is micro skeletal and macro skeletal unit already. We have seen what is micro skeletal and macro skeletal Just for a comparison Micro skeletal it's just a part of bone that is forming by the action of periosteal matrix Okay, so functional matrix the periosteal matrix is at the point the small part of one by transformation that is by formation or the Resorption and deposition that transformation is happening by Micro skeletal units and it affects the size and shape Fx a size and shape. Okay, that is micro skeletal unit But the macro skeletal unit it is not just the part of bone. It is a core of bone and By the action of capsular matrix, okay This capsular matrix act upon macro skeletal unit. It is by the process of trans translation that is volumetric expansion is happening and It is the Not just size and shape. It is the position. So positional changes happening with the Macro skeletal unit. So these two compare to Happen the growth of that particular bone. So, let's see some example and it's corresponding micro skeletal unit that is periosteal matrix if this temporalis it is associated with the coronal process tooth the alveolar bone The medial and lateral teregoid muscle associated with angloframus which are the micro skeletal unit, which is a part of a bone And the capsular matrices such as nasal mass eye mass and or official capsule nasal mass it The macro skeletal unit is cranium then eye mass its orbit and the or official Capsule the core of mandible and maxilla. So that is the basic idea of periosteal matrix and Micro skeletal unit and also the capsular matrix and macro skeletal unit. So according to this theory The growth potential actually lies outside the bone that is a functional space or a functional matrix where the Things are happening rather than the bone itself. So that is the most accepted theory That is functional matrix theory the functional cranial component. It's functional matrix on its skeletal units And the capsular matrix is and periosteal matrices. It's micro skeletal and macro skeletal units So what are the clinical implications of this functional matrix theory? Because orthodontic corrections of malocclusion is done either by intraoral on or extraoral appliances So force application by these appliances tend to alter the functional matrix So we are applying this concept in orthodontic appliances. So alteration of periosteal functional matrices produces changes in micro skeletal unit That is micro skeletal unit And alteration in the capsular functional matrix is produces macro skeletal Unit changes in the macro skeletal unit So what happens the periosteal matrix? That is a tooth. This is a periosteal matrix tooth The movement orthodontic after the orthodontic treatment there is change in alveolar bone And capsular matrix such as dendrofacial Orthopedics like dendrofacial complex. There is macro skeletal unit. That is joe's Okay, joe movement or joe changes will happen. That is the capsular matrices So that's all about the theories the major theories of growth We have covered the theories genetic theories, virtual theory, cartilaginous theory and Functional matrix theory. So these are the four important theories which commonly are for the university exam Uh The functional matrix theory is a little complicated, but it is Just the two parts and if you have this flow chart in your mind, it will be easy So I'll come up with a new session if you have any particular chapter or particular subject would like to have glasses on Do mention in the comment box So I'll come up with a new topic And dentistry and more Thank you