What do systematic reviews say?

Low polymerization shrinkage resin composite (silorane, ormocer, bulk-fill or other modified-monomer composite) vs Conventional methacrylate-based resin composite

At 24 months, marginal discoloration did not differ significantly (7 groups; p = 0.77; ungraded).

• Meta-analysis of the clinical behavior of posterior direct resin restorations: Low polymerization shrinkage resin in… 2018 All outcomes

  24 months · Posterior class I/II restorations in permanent teeth; multicenter randomized controlled trials conducted across Europe, the Americas, and the Middle East
  Odds ratio (OR) 1.08 [0.64, 1.84]
  6 studies
  GRADE not reported
• Meta-analysis of the clinical behavior of posterior direct resin restorations: Low polymerization shrinkage resin in… 2018 All outcomes

  60 months · Posterior class I/II restorations in permanent teeth; multicenter randomized controlled trials conducted across Europe, the Americas, and the Middle East
  Two articles (three experimental groups) evaluated marginal discoloration after 60 months; the meta-analysis showed no difference in the overall effect.
  2 studies
  GRADE not reported
• Meta-analysis of the clinical behavior of posterior direct resin restorations: Low polymerization shrinkage resin in… 2018 All outcomes

  12 months · Posterior class I/II restorations in permanent teeth; multicenter randomized controlled trials conducted across Europe, the Americas, and the Middle East
  OR 1.53 [0.98, 2.41]
  13 studies · 2082 participants
  GRADE not reported