Biomechanics 3(how to achieve various tooth movements)
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- čas přidán 17. 04. 2020
- Here you will find the way to calculate moment of couple and how to manage ratio between moment of force and moment of couple to achieve tipping translation and torque
Finally I understood the mechanics behind twisting wire and increasing couple.
Thank you so much sir....
I could never show you, dr enough gratitude for I have never understood orthodontics the way I have from seeing your videos
One of the best videos i have ever seen …thank you sir
This is a blessing 🙏..thank you so much..keep doing more videos Sir!!
pleasw continue this series in biomechanics . it is very helpful ; especially for beginners
Sir you are amazing 🙏🏻 I am breaking my head to understand these concepts..... you are like a god for me now..... please make more videos sir..... please make a video on brackets and types sir
Amazing way for explanation the concepts ...
Best regards to you
Thank you so much. This explanation was amazing and is helping me a lot.
Thank you so much your lessons are such a help ! hope you will do more lessons ❤️
You are the best. I have never in my life seen a teacher like you. Thanku.
Thanks a lot :)
thank you for this wonderful explanation
Excellent explanation god bless you
Sir make more vedios,u r best Teacher of world
Thank you doctor for this video❤
❤❤❤thank you somuch! Dr!
Sir amazing.
Kindly add videos on bracket and archwires,bracket placement
Thanks you so much sir, amazing !!!
Thanks doctor many thanks really
MashaAllah!
Great work doctor
Keep it going
Thank you sir ...plz upload video of biomechanics using TADA for retraction.
Sir you cleared the total concept like it was but "'a piece of cake"
Sir pls make more video's on biomechanics
Sir your vedio are amazing an humble request if you can make a vedio to explain lace back and tie
Thanks so much sir. Eventually i understood how to cure the Class 2 divison 1
Big Fan Sir 🇵🇰
Thankyou so much sir
Sir i request to give more examples..
3-4 more videos on same
Respect ❤
Very good plz carry on 🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹
Excellent
Wish u to be my supervisor in case i get into ortho😅👏
Thank you so much, this is basically the greatest video i have ever seen on orthodontics.
i have a question , do we clinically twist the wire in bracket or is it passively twisted when retraction is performed.
let's say i want to achieve translation retraction of incisors , how do i measure the right twist needed to achieve a specific moment of a couple to counteract the moment of force?
Thanks for appreciation. Usually we don't have to twist wires if we are retracting on heavy rectangular wires bcz of built in torques in bracket which is very high in MBT system nowadays.
If we observe retroclination on retraction then it's clinical judgement to give twist/ torque bend/ curve or any other mechanics to create couple
Thank you
Sir what is this one couple force two couple force..Can you please explain
Hi dr,im getting increasing proclination of my incisors during my levelling and alignment.Will torque during square wire improve this round tipping?
Hi. Rectangular wires can do torquing but sometimes space is deficient so space creation might be required
❤❤
The only thing you need to improve that is your local-English pronunciation.
By the way Sir, your presentation and illustration is amazing. I could comprehend your vid with pleasure.
good evening doctor! can you elaborate how the twisting of rectangular wire is done? is it done only in SS rectangular wires? thank you
Hiii. Yes usually in rectangular SS. Although it can be given in TMA too.
Twisting of wire can be easily achieved by pliers. The way you rotate rubik's cube up and down, the same movement to be given to the wire. I am making a presentation on 3rd order bends for fixed appliance playlist. Soon I'll elaborate your query in that.
At what point of time do we use rectangular wire sir.. ?? When we start the treatment?? Or later??
Later. After alignment is done with thin round wires
Elastics should be used along with rectangular wires right sir??what is the guage of the wire which we have to use when we start the treatment sir??
Yes preferably rectangular. 19x 25 SS better
at @9:55 total force to be applied on wire is 1100 or 550(becuase it's a couple?)
500 / 0.45 = 1111 as per formula mentioned. Even if you want to calculate moment through other formula force x force arm then also the answer will be 1100 gms.
How? Calculate individually : 1100 gms force applied lingually and distance from CRes is 10 = 1100. Same force magnitude applied labial direction but distance from CRes is 10.45mm as the height of bracket is 0.45 mm = 11495. Difference between both moment calculated is 495 this is the moment you need here.
I have used exact figures from William profitts book so you can refer that too.
why the couple in the first example 100 ?
Initially there is uncontrolled tipping when there's no couple. Just moment is created which is 500gmmm in example.
Then there's creation of couple and tooth doesn't tip anymore. Tooth will only move bodily now if the wire is strong and doesn't deflect or get deformed. For bodily movement, 100 gm is needed as the width of bracket is 5mm. This will produce couple of 500 gmmm and tooth will move further. Mc and Mf will get equal then
I hope I cleared the query
what do you mean by twist the wire? you mean do wire bending ?
Yes. 3rd order bending
@@irfansinstituteofclinicalortho thank you for your reply doc
how did you calculate the couple? why did you decide that the couple is 100 in 3:44 ??
For translation your moment of couple has to be equal to moment of force.
Width of bracket is 5mm so to reach 500 gmmm (moment of force). Your couple should be 100 as the formula is force x distance between point of force application.
@@irfansinstituteofclinicalortho okay thanks for the clarification doctor, but what about in the second example at 8:07... how did you create a couple of 350? i suppose the distance is within the bracket right? if so then the distance is 0.45mm (as written on the picture)??
@@1996712 yes. Bcz bracket slot vertical height is either 18 mil which is equal to 0.45mm or 22 mil equal to 0.55mm.
To achieve 350gmmm moment of couple you will have to apply approx 700 gm couple force.
Sir , in 3:44 the couple = force (D1+D2)= 50 × 2.5+2.5 = 250gmms
When you keep on increasing force, a time comes when you start creating couple more and more. When couple reached 100gm (in example) then you will be able to generate moment of couple 500gmmm and bodily movement. Bcz width of bracket will always a constant, the only possible change is change in force. 250gmmm will not move tooth bodily.
i love you
While calculating the mf why did you take the distance as 10 mm
Assumption to give concept same as given in profitt. Usually, this is the average distance where CRes is located.
Sir how can we control force due to couple?
There are many ways to produce couple. For example by twisting the wire, torquing arch, even RCS can do that if given in rectangular wire.
@@irfansinstituteofclinicalortho Ok sir but how do we know the values?
@@rekhabharadwaj8557 that's actually clinical judgement. Let's say in patients follow up visit you notice more tipping then you will have to create more couple by twisting the wire etc. And vice versa.
Since We give couple in heavy wires, you have to give it little by little every time. Till you achieve your results. Although the are gauges like dontrix to measure forces but used to measure force of elastics and springs, not easy for wires.
@@rekhabharadwaj8557 secondly, the whole journey from standard edgewise to MBT is the gradual development of the bracket prescription in which you don't have to put your energy in wire bending and you achieve ideal bodily movements and tooth positions with least efforts.
Whether you are achieving bodily movements with twisting or bending the wire or just bcz of built in couple in brackets, calculation number is the same which i mentioned in video
@@irfansinstituteofclinicalortho ok sir thank you so much.
One more doubt sir , in the Mc formula you have taken the dimension of wire as the points of force..As the wire is twisted , the height will change , like isn't it so that the diagonal length about be taken?