Abstract: Objective: To investigate the effect of EDTA pretreatment on dentin bonding in non-carious sclerosis of tooth neck. Methods: 40 teeth with representative wedge-shaped defects extracted from periodontal disease patients were randomly divided into four groups (C1, C2, C3, and C4), 10 in each group. Three experiments were carried out as follows: (a) the teeth were treated with different concentrations of EDTA (10%, 15%, 20%) for 60 s and 35% phosphoric acid for 30 s; then coated with Easy One adhesive, filled with resin, and hot and cold treated for 5000 cycles. The fracture mode and bonding strength of the bonding interface were observed; (b) the same as (a) except the Easy One adhesive with 0.1% rhodamine B; (c) the same as (a) except that the filled teeth were immersed in the 50% alcohol solution with 0.1% Rhodamine B and then performed 5000 cycles of cold and hot cycles. Results: The higher the concentration of EDTA, the more obvious the bonding effect of cervical sclerotic dentin (CSD), the higher the quality of mixed layer and resin protrusion, the closer the bonding between resin and CSD, the stronger the penetration of resin into CSD, and the less the microleakage of bonding interface (P<0.05). Conclusion: EDTA can be used as a surface pretreatment agent for CSD and can be widely used in the clinic to reduce the failure rate of CSD resin bonding.

Key words: EDTA pretreatment, CSD, bonding effect