What do systematic reviews say?

Periodontal treatment (scaling and root planing, alone or with antimicrobials) vs Alternative (less intensive) periodontal treatment, alone or with placebo

• Treating periodontal disease for preventing adverse birth outcomes in pregnant women 2017 · Cochrane All outcomes
  Preterm births < 35 weeks reported in four studies across three subcomparisons; none of the subcomparisons showed a difference; SRP versus alternative mechanical treatment not pooled due to considerable heterogeneity;…
  4 studies
  Very low

Periodontal treatment (scaling and root planing, alone or with antimicrobials) vs Alternative (less intensive) periodontal treatment, alone or with placebo

It is very uncertain whether periodontal treatment (scaling and root planing, alone or with… changes gestational age (preterm birth < 37 weeks) compared with alternative (less intensive) periodontal treatment, alone or with… (very low certainty).

• Treating periodontal disease for preventing adverse birth outcomes in pregnant women 2017 · Cochrane All outcomes

  SRP + antimicrobial vs alternative mechanical treatment + placebo
  RR 1.40 [0.67, 2.92]
  1 study · 243 participants
  Very low
• Treating periodontal disease for preventing adverse birth outcomes in pregnant women 2017 · Cochrane All outcomes

  SRP vs alternative mechanical treatment
  RR 0.87 [0.46, 1.67]
  4 studies · 1168 participants
  Very low
• Treating periodontal disease for preventing adverse birth outcomes in pregnant women 2017 · Cochrane All outcomes

  SRP + antimicrobial vs SRP + placebo
  RR 3.08 [1.15, 8.20]
  1 study · 243 participants
  Very low

Periodontal treatment (scaling and root planing, polishing, or surgery), alone or with oral hygiene counselling, antiseptics, or antimicrobials vs no treatment

It is very uncertain whether periodontal treatment (scaling and root planing, polishing, or… changes preterm birth < 35 weeks compared with no treatment (very low certainty).

• Treating periodontal disease for preventing adverse birth outcomes in pregnant women 2017 · Cochrane All outcomes
  RR 1.19 [0.81, 1.76]
  2 studies · 2557 participants
  Very low

Periodontal treatment (scaling and root planing, polishing, or surgery), alone or with oral hygiene counselling, antiseptics, or antimicrobials vs no treatment

It is very uncertain whether periodontal treatment (scaling and root planing, polishing, or… changes preterm birth < 32 weeks compared with no treatment (very low certainty).

• Treating periodontal disease for preventing adverse birth outcomes in pregnant women 2017 · Cochrane All outcomes
  RR 1.35 [0.78, 2.32]
  3 studies · 2755 participants
  Very low

Periodontal treatment (scaling and root planing, polishing, or surgery), alone or with oral hygiene counselling, antiseptics, or antimicrobials vs no treatment

Periodontal treatment (scaling and root planing, polishing, or… showed no clear difference in gestational age (preterm birth < 37 weeks) compared with no treatment (low certainty).

• Treating periodontal disease for preventing adverse birth outcomes in pregnant women 2017 · Cochrane All outcomes
  RR 0.87 [0.70, 1.10]
  11 studies · 5671 participants
  Low