1. Sensitivity analysis of Analysis 1.1 (with and without Ateih 2008).

Outcome (Analysis)	With all studies included			Excluding Atieh 2008
	Studies	Participants	Effect estimate	Studies	Participants	Effect estimate
1.1 Major failure
1.1.1 Short term (less than 12 months)	1	76	Not estimable	Not affected
1.1.2 Long term 12 months or more	3	346	RR 0.18 (CI 0.06 to 0.56)	Not affected
1.2 Pain
1.2.1 Short term (less than 12 months)	1	64	Not estimable	Not affected
1.2.2 Long term (12 months or more)	2	312	RR 0.15 (0.04 to 0.67)	Not affected
1.3. Peri/postoperative discomfort/pain	2	381	RR 0.56 (0.36 to 0.87)	Not affected
1.4 Gingival bleeding
1.4.2 Short term (less than 12 months)	2	226	RR 1.69 (0.61, 4.66)	1	76	5.00 (0.25, 100.80)
1.4.3 Long term (12 months or more)	2	195	1.74 (0.99, 3.06)	1	62	1.50 (0.47, 4.80)