What do systematic reviews say?

Hall technique vs Non-restorative caries treatment

It is very uncertain whether preformed metal crown (fitted using the Hall Technique) changes major failure compared with non-restorative caries treatment (very low certainty).

• Preformed crowns for decayed primary molar teeth 2015 · Cochrane All outcomes

  12 months
  RR 0.12 [0.01, 2.18]
  1 study · 92 participants
  Very low

Preformed crown (any material; conventional technique or Hall Technique) vs Filling (any material; with or without complete carious tissue excavation; with or without pulp treatment)

• Preformed crowns for decayed primary molar teeth 2015 · Cochrane All outcomes

  Short term (less than 12 months)
  Short term (less than 12 months): no failures in either group; effect not estimable (Analysis 1.1.1; 76 teeth, 38 participants; one study, Hutcheson 2012).
  1 study · 76 participants
  GRADE not reported
• Preformed crowns for decayed primary molar teeth 2015 · Cochrane All outcomes

  Long term (12 months to 48 months)
  RR 0.18 [0.06, 0.56]
  3 studies · 346 participants
  Moderate