DS = Dataset number; Vol. = Journal volume; DS-1 = Dataset/Composite resin versus amalgam; DS-2 = Dataset/HVGIC versus amalgam; OR = Odds ratio; CI = Confidence interval; ln = Natural logarithm; SE = Standard error; EurJProsthodontRestDent = European Journal of Prosthodontic and Restorative Dentistry; JADA = Journal of the American Dental Association; PractClinMed = Practical Clinical Medicine (journal); JDR = Journal of Dental Research; PAHO = Pan-American Health Organisation; HVGIC = High-viscosity glass-ionomer cement.