Table 3. Mean and standard deviation of shear bond strengths (unit: MPa).

Materials	Surface treatment				Total mean
	Control	Air abrasion	Monomer	Air abrasion + Monomer
Jet	1.64a (0.80)	2.07ac (0.89)	1.45a (0.50)	1.68ad (1.08)	1.71 (0.84)
Luxatemp	2.77b (0.61)	2.38bc (0.85)	2.76bc (1.08)	2.25bcd (0.56)	2.54 (0.81)

Same superscripted letters indicate no significant difference at level of 0.05.