Question

How to overcome polymerization shrinkage of composite?

Answer 1

Hy,
Polymerization shrinkage of composite can be overcomed by proper etching, bonding and then composite restoration. Nowadays, all in one bottle comes which contains etchant, adhesive and bonding agent in one bottle. Apply it, cure it for 20 secs. Then apply composite in increments. Remember to apply composite in incremental layers and then cure each layer for 20 seconds.
Mind it composite is never applied in bulk as we do for amalgam.
Now, use carbon paper and see the highpoints, remove them using airrotor. Then, finish and polish the restoration.
Reference - Textbook of Operative Dentistry by Sturdevant, 5th Ed.
Hope it helps
Regards
Dr Chinmay
Thanks

Answer 2

Here is your answer buddy,

Stress generation at tissue/resin composite interfaces is one of the important reasons for failure of resin-based composite (RBC) restorations owing to the inherent property of polymerization shrinkage. Unrelieved stresses can weaken the bond between the tooth structure and the restoration, eventually producing a gap at the restoration margins. This can lead to postoperative sensitivity, secondary caries, fracture of the restorations, marginal deterioration and discoloration. As polymerization shrinkage cannot be eliminated completely, various techniques and protocols have been suggested in the manipulation of, and restorative procedures for, RBCs to minimize the shrinkage and associated stresses. Introduction of various newer monomer systems (siloranes) may also overcome this problem of shrinkage stress. This review emphasizes the various material science advances and techniques advocated that are currently available or under trial/testing phase to deal with polymerization shrinkage in a clinical environment.


Hope this helps you.
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