Table 2.

Excluded trials with reasons for exclusion

Article	Reason for exclusion
Hickel and Voss, 1990 [31]	Does not report on caries as trial outcome
Frencken et al., 2006 [33]	Does not report on caries as trial outcome
Smith et al., 1990 [34]	Does not report on caries as trial outcome
Smales et al., 1990 [35]	Does not report on caries as trial outcome
Yip et al., 2002 [36]	Does not report on caries as trial outcome
Phantumvanit et al., 1996 [16]	No computable data reported: Does not report on number of same type of units for caries (tooth surfaces) as total number of evaluated units (restored teeth), baseline number of units
Rahimtoola and van Amerongen, 2002 [17]	No computable data reported: Does not report on number of evaluated GIC/Amalgam restorations
Taifour et al., 2003 [18]	No computable data reported: Does not report on number of baseline, restorations, number of evaluated restorations, number of restorations with caries (GIC/Amalgam)
Qvist et al., 2004 [19]	No computable data reported: Does not report on number loss-to-follow up restorations per GIC/Amalgam
Rahimtoola and van Amerongen, 1997 [30]	Published study protocol-no results reported
Mjör and Jokstad, 1993 [32]	No computable data reported: Number of carious teeth not reported as quantitative units per GIC/Amalgam

GIC = Glass-ionomer cement.