In which of the following will the effects of polymerization shrinkage be greatest?
Direct veneer restoration
Preventive resin restoration.
Class I occlusal restoration
Class IV restoration
1 explanations
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. Most flowable composites have an average volume polymerization shrinkage rate of 5% [49]. Kusai Baroudi et al., concluded that the polymerization shrinkage-strain of flowable composites should be taken into consideration in combination with their filler-fraction [50], which highly influences their shrinkage behaviour. Lower filler loading materials, are more likely to be highly fluid. Even though these materials exhibited substantial polymerization shrinkage, they might be successfully used in microconservative occlusal cavities, as the consequences of polymerization shrinkage would be low because of the limited volume of the material used. However, in deep bulk-filled cavities fractures along the cavosurface enamel margin and cracks along the enamel wall have been detected [51].
answer is CLASS 1
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4525629/#:~:text=Most%20flowable%20composites%20have%20an,of%205%25%20%5B49%5D.
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