Now the ivoclar says 500 flexure strength for the milled restoration. If we bond the restoration with the tooth, then there shouldn't be a issue with the strength.
Very Good comparison. Can you please share information about the hardness of these two materials in compare to the hardness of natural tooth enamel. May all be happy and at ease, free from dis-ease. 🙏❤️🙏
it depends of the tooth and individual.. generally the toughest is enamel on canines and is around 250mp on other teeth its variable but is generally in range of 150-200 mp ( but dont look at those numbers as something relevant there are other factors ..one is if crown is on implant then and other one on a natural tooth then there is huge difference a weakest natural tooth of lets say 100MP can be way more resilient then the Zir with 1350MP on implant >)
Pressing: - Waxing up the restoration - Investing - Burning out the wax - Pressing the superheated restorative material into the negative space To get the benefits of lithium disilicate, it needs to be pressed instead of milled ___ There are actually two different methods of milling: - Cutting - Grinding Cutting is the more precise method and uses burs that are designed to slice away the material in a very predictable fashion Grinding uses diamond burs to wear down the material into the desired shape ___ Fracture toughness is the ability of the material to resist surface fractures
@@Shadow1986 pressed same offers almost double the bonding strength with layered porcelain its approx. 100 vs 200.. and not just that pressed same have better fit generally on the margin (if margin is perfect then its equal ..but if margin is not (which is 9999 percent of real cases) then pressed(handmade) is better
Наука
nicely explained thanks alot
tnank a lot for this explanation =)
Now the ivoclar says 500 flexure strength for the milled restoration.
If we bond the restoration with the tooth, then there shouldn't be a issue with the strength.
Very Good comparison.
Can you please share information about the hardness of these two materials in compare to the hardness of natural tooth enamel.
May all be happy and at ease, free from dis-ease.
🙏❤️🙏
it depends of the tooth and individual.. generally the toughest is enamel on canines and is around 250mp on other teeth its variable but is generally in range of 150-200 mp ( but dont look at those numbers as something relevant there are other factors ..one is if crown is on implant then and other one on a natural tooth then there is huge difference a weakest natural tooth of lets say 100MP can be way more resilient then the Zir with 1350MP on implant >)
Thanks ☺️
You're welcome!
What's the cost?
We're we use milled emax....in which cases...
Pressing:
- Waxing up the restoration
- Investing
- Burning out the wax
- Pressing the superheated restorative material into the negative space
To get the benefits of lithium disilicate, it needs to be pressed instead of milled
___
There are actually two different methods of milling:
- Cutting
- Grinding
Cutting is the more precise method and uses burs that are designed to slice away the material in a very predictable fashion
Grinding uses diamond burs to wear down the material into the desired shape
___
Fracture toughness is the ability of the material to resist surface fractures
If fracture toughness of milled crown is better, how pressed e-max crown is better
Pressed is higher fracture toughness. watch video again
@@Shadow1986 pressed same offers almost double the bonding strength with layered porcelain its approx. 100 vs 200..
and not just that pressed same have better fit generally on the margin (if margin is perfect then its equal ..but if margin is not (which is 9999 percent of real cases) then pressed(handmade) is better
This was heavily biased