C - FACTOR IN COMPOSITE

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 CONFIGURATION FACTOR ( C- FACTOR)

 IN COMPOSITE 

  • It is a three dimensional configuration of a prepared cavity.
  • c - factor was introduced by feilzer in the year 1987
  • Configuration factor is calculated by the number of bonded surface to unbounded surface .
  • composite resin undergo polymerisation shrinkage : polymerisation shrinkage is a process that occurs when resin gets cured.
  • stress generation along bonded area as they are bonded micro mechanically
  • free surface - free flow of composite thereby decreasing stress.

  NOTE: REFER THE ABOVE IMAGE - In order to get a better understanding on bounded and unbounded surface in a prepared. cavity 


REASONS FOR POLYMERISATION SHRINKAGE

  • When composite resin gets cured ,during
  •  the polymerisation process since monomeric particles are more voluminous than polymer ,moneric chains gets unbounded vanderwal force of interaction gets converted to covalent bond.
  • matrix generally shrink from cavity wall,material cure towards the centre of bulk pulls material away from interface.

STEPS TO AVOID POLYMERISATION SHRINKAGE:

  1. Incremental addition of resin
  2. resin layer should not exceed 2 mm in depth
  3. oblique layering techniques
  4. flowable composite liner 
  5. increasing the filler particle content thereby decreasing polymerisation
  6. different technique of light curing 


DETERMINATION OF AMOUNT OF STRESS DISTRIBUTION:
  •  In class 1 cavity preparation the number of bonded surface is five ,unbounded surface is 1 ( occlusal) in this case the c - factor is 5 that indicates more stress generation 
  • In class four cavity preparation- the number of bonded surface is one ,unbounded surface is 4 so the c- factor is 0.25
  • In class five cavity preparation the number of bounded surface is 5 and number of unbounded is 1 so the configuration factor is 5/1
  • IN ABRASIVE LESION : C - FACTOR = 1 
  • If configuration factor is more than 1 that means it has more potential bond distribution
  • wider the cavity prepared less stress.
AIMS OF THIS POST:
  •  Configuration factor is a very important factor to be known while handling dental composite .
  •  Important keywords to mention are bounded surface and unbounded surface.
  • C- FACTOR FOR CLASS 1- 5;CLASS  4 -0.25,CLASS 5-5
  • We need to know the steps on how to handle the situation better in a clinical scenario in order to provide the best treatment.
                                            THANK YOU 

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