What do systematic reviews say?

Composite resin with etch-and-rinse (total-etch) adhesion vs Composite resin with self-etch adhesion (same universal adhesive)

No comparative effect estimate was reported; etch-and-rinse had a higher tabulated failure rate.

• Clinical effectiveness of restorative materials for the restoration of carious primary teeth without pulp therapy: a… 2022 All outcomes

  1.5 years · University
  Annual failure rate (%) etch-and-rinse 19.5%; self-etch 7.0%
  1 study · 44 participants
  GRADE not reported

Single full-coverage metal-ceramic crown over composite core and post vs Direct adhesive composite restoration with post (conventional filling, no crown)

It is very uncertain whether single full-coverage metal-ceramic crown over composite core and post changes non-catastrophic failure of the restoration (requiring further… compared with direct adhesive composite restoration with post (conventional… (very low certainty).

• Single crowns versus conventional fillings for the restoration of root‐filled teeth 2015 · Cochrane All outcomes

  3 years
  RR 0.33 [0.04, 3.05]
  1 study · 117 participants
  Very low

Single full-coverage metal-ceramic crown over composite core and post vs Direct adhesive composite restoration with post (conventional filling, no crown)

• Single crowns versus conventional fillings for the restoration of root‐filled teeth 2015 · Cochrane All outcomes

  3 years
  SoF 'Catastrophic failure of restoration': assumed risk (conventional filling) 0, corresponding risk (single crown) 0; no events in either group so a relative effect was not estimable; 117 participants (1 study); GRADE…
  1 study · 117 participants
  Very low