Class 2 composite bulk filling will satisfy the c factor rule but depth of curing light is only 2mm, so by bulk filling 4mm gingival depth class 2 cavity will leave an un cured composite will affect the strength of the restoration
C factor is not the only thing tat warrants incremental buildup....Thickness of restoration,area covered also affects the curing and warrants incremental buildup I think there are so many things about composites that make it a headache for clinicians coz its super technique sensitive.... These things are improving of crse...still long way to go...
Twenty seconds is mandatory. If you are using very high intensity light curing, composite might get cured in five seconds, but the chances for bond failure is more. I prefer to use moderate intensity light curing unit and curing for twenty seconds per increment and a final cure after finishing the restoration for forty seconds
Adhesive Dentistry and Endodontics: Materials, Clinical Strategies and Procedures for Restoration of Access Cavities: A Review Richard S. Schwartz DDS, Ron Fransman DDS, in Journal of Endodontics, 2005 The problem with polymerization shrinkage is amplified in access cavities because of a concept known as C-factor or configuration factor (43, 167). C-factor refers to the ratio of bonded surfaces to free or unbonded surfaces. The higher the C-factor, the greater the stress from polymerization shrinkage (43). Restorations with C-factor higher than 3:1 are considered to be at risk for debonding and microleakage (170). In a class 5 restoration, the ratio might be 1:1. In an access cavity, the C-factor might be 6:1 or even 10:1. In a root canal system obturated with a bonded resin material, it might be 100:1 Kindly read the above article. In root canal...we should use resin with less shrinkage and minimal resin volume....
so greatful that i found your channel today
god blessed you
Thank you, Thank you so much sir for making this topic very much easy. You're a gem. Thank you again.
Helpful presentation, Thank you sir
Clear explanation thank you very much Doctor 👍👍
Amazing vid Doc! Looking forward to more of your valuable lessons:)
Awesome, thank you!
Realy helpful doc..
Class 2 composite bulk filling will satisfy the c factor rule but depth of curing light is only 2mm, so by bulk filling 4mm gingival depth class 2 cavity will leave an un cured composite will affect the strength of the restoration
So well explained sir
Thanks doc very helpful
C factor is not the only thing tat warrants incremental buildup....Thickness of restoration,area covered also affects the curing and warrants incremental buildup
I think there are so many things about composites that make it a headache for clinicians coz its super technique sensitive....
These things are improving of crse...still long way to go...
Most people think composite restorations are very easy. But in reality, they are extremely technique sensitive
Explained in very simple and understandable way. Thankyou sir🙏🙏🙏
You're most welcome
Great video sir..... Thank you
So nice of you
Thank you so much sir for this wonderful presentation.🙏🏻
You are most welcome
Very helpful video
Thank you ...
This was great, thanks!
Glad you enjoyed it!
Useful sir thankyou
So nice of you
Amazing Video Sir . I have one question about flowable composite and light curable Base liner . Does C factor apply to them The Same ??
Very helpful
Glad to hear that
Thank you 🙏 so much could you please do a lecture on deep margin elevation in class ll compsite
👍👍👍
Amazing presentation...
what book can we read c factor ??
👏
😇😇👍🏽👍🏽
How many second should I lightcure the increment is it the same as 20 sconds or only 5 seconds is enough?
Twenty seconds is mandatory. If you are using very high intensity light curing, composite might get cured in five seconds, but the chances for bond failure is more. I prefer to use moderate intensity light curing unit and curing for twenty seconds per increment and a final cure after finishing the restoration for forty seconds
Thanks . Bt what should we do in post n core ? How to do it in increments?
Adhesive Dentistry and Endodontics: Materials, Clinical Strategies and Procedures for Restoration of Access Cavities: A Review
Richard S. Schwartz DDS, Ron Fransman DDS, in Journal of Endodontics, 2005
The problem with polymerization shrinkage is amplified in access cavities because of a concept known as C-factor or configuration factor (43, 167). C-factor refers to the ratio of bonded surfaces to free or unbonded surfaces. The higher the C-factor, the greater the stress from polymerization shrinkage (43). Restorations with C-factor higher than 3:1 are considered to be at risk for debonding and microleakage (170). In a class 5 restoration, the ratio might be 1:1. In an access cavity, the C-factor might be 6:1 or even 10:1. In a root canal system obturated with a bonded resin material, it might be 100:1
Kindly read the above article.
In root canal...we should use resin with less shrinkage and minimal resin volume....
DOES IT APPLY FOR FLOWABLE COMPOSITES TOO DR
Yes. Definitely. For flowable composite, the shrinkage will be more than restorative composite
SO SIR MORE THE BONDED AREA? MORE IS THE MICROLEAKAGE?
Yes