C - FACTOR IN COMPOSITE

-

 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 

Comments

Post a Comment

Popular posts from this blog

Sterilization technique in microbiology

-
Image
HELLO! DOCTOR VANAKAM, I hope you all are doing good today we will be discussing sterilization various methods of sterilization, about dry heat sterilization and moist heat sterilization along with different methods employed, and what are the materials to be placed in this method in detail about autoclave its principle, working and of course uses. As I have had already informed you all through my previous post on the contribution of Louis Pasteur and Koch postulates if we haven't checked it out yet do check it out using this link   https://www.stencildent.com/2020/07/contributions-of-louis-pasteur-and-koch.html  wherein I would explain the importance for the need of the HOUR and always to sterilize things to and from the patients and also get geared up for the next post on SHOCK wherein I would cover the definition, types, classification along with etiology, pathogenesis, flow chart, the complication of septic shock in detail so now without any further ado lets get started. STERILI
Read more

STAGES AND STEPS IN TOOTH PREPARATION

-
Image
                      STAGES AND STEPS IN                                        TOOTH  PREPARATION                 TOOTH PREPARATION INVOLVES 2 STAGES  1) INITIAL TOOTH PREPARATION:    OUTLINE FORM AND INITIAL DEPTH PRIMARY RESISTANCE FORM  PRIMARY RETENTION FORM CONVENIENCE FORM 2) FINAL TOOTH PREPARATION  REMOVAL OF REMAINING CARIES PULP PROTECTION SECONDARY RESISTANCE AND RETENTION FORM FINISHING OF EXTERNAL WALL FINAL PROCEDURE OF CLEANING AND INSPECTING  Each stage and step is explained in detail please refer to above notes . note:please do not  download and share all rights are reserved to stencildent.
Read more

Hypersensitivity microbiology notes

-
Image
                          HYPERSENSITIVITY   hello, doctor vanakam, I hope you all are doing good, as intimated through the last post on anaerobic culture method  https://www.stencildent.com/2020/08/anaerobic-culture-methods-microbiology.html  if u haven't checked it out do read using this link without any further ado lets get started. CONTENTS: 1)Definition 2)Classification 3)type 1 hypersensitivity reaction a)1st exposure b)2nd exposure c)mediators of reaction d)late-phase reaction 4)type 4 hypersensitivity 5)treatment  1)DEFINITION: It refers to a condition in which immune response results in excessive reaction leading to tissue damage, disease, or even death in a sensitised host. 2) CLASSIFICATION: Coomb and gel classification in 1963 into type 1 to 4  Type 1,    type 2, type 3       : They depend on the interaction of antigen with humoral antibodies They are the immediate-type reaction  type 4 : They are mediated by t lymphocyte Delayed-type of hypersensitive reaction 3)TYPE 1
Read more