Table 2.

Surface pretreatments of dentine

Pretreatment	method
M1	distilled water
M2	35% phosphoric acid 30 s
M3	5% NaClO solution 60 s
M4	15% EDTA gel 60 s
M5	15% EDTA gel 60 s, 5% NaClO solution 60 s
M6	15% EDTA gel 60 s, 10% NaClO solution 60 s
M7	35% phosphoric acid 30 s, 5% NaClO solution 60 s
M8	35% phosphoric acid 30 s, 10% NaClO solution 60 s

M: Pretreatment methods; M1-M8: the different pretreatment methods.