Table 1.

Number of the micro-bars and the percentage of each failure mode of the μTBS tested specimens obtained from each tooth with cross-section size of 1×1 mm², 1×2 mm², and ×3 mm².

Micro-bar cross- section	Tooth	1		2		3		4
		Plasma treated	Control	Plasma treated	Control	Plasma treated	Control	Plasma treated	Control
1×1 mm2	Number of micro-bars	9	5	16	9	7	9	8	5
	Interface & mixed failure* (%)	33	60	63	44	29	44	100	100
	Cohesive failure* (%)	67	40	27	56	71	56	0	0
1×2 mm2	Number of micro-bars	9	5	8	5	7	8	11	9
	Interface & mixed failure (%)	33	80	100	100	71	100	82	89
	Cohesive failure (%)	67	20	0	0	29	0	18	11
1×3 mm2	Number of micro-bars	3	2	2	3	4	3	1	2
	Interface & mixed failure (%)	33	50	0	67	50	33	100	100
	Cohesive failure (%)	67	50	100	33	50	67	0	0

^*Interface failure: fracture occurred in adhesive with no fractured dentin on the resin and no remnants of resin on the dentin surfaces; Cohesive failure: fracture is completely located in dentin, resin or Zapit; Mixed failure: test specimen shows both interface and cohesive failures.