Abstract
The purpose of the present study was to evaluate the microleakage at the composite-repair interface using different bonding systems. Composite resin specimens (Filtek Z250 - 3M-ESPE) were divided into five groups (n=20) according to the following bonding mechanism: C - control - etching with 35% phosphoric acid; SB1 - etching and application of one coat of Single Bond (3M-ESPE); SB2 - etching and application of two coats of Single Bond (3M-ESPE); SMP1 - etching, application of Scotchbond Multi-Purpose primer (3M-ESPE) followed by the adhesive and, SMP2 - etching, application of Scotchbond Multi-Purpose adhesive (3M-ESPE) without the primer. Thereafter, all groups received new resin application. Samples were thermocycled (500 cycles / 5ºC - 55ºC [±2]) and immersed for 4h in 2% methylene blue buffered dye solution (7.0 pH). Three examiners measured the extent of microleakage in a stereoscope microscope, using four representative scores. For all experimental groups, no significant difference in microleakage at the repair was identified by Kruskal-Wallis test (p > 0.05). Therefore, different types of bonding systems presented the same effect on the dye penetration along the repair interface.
Highlights
Repair is an alternative to the total replacement of a defective composite resin restoration
Complete removal of defective composite restorations may lead to larger cavities with further loss of tooth structure 6, 10
Half the mold was filled with composite resin Filtek Z250
Summary
Repair is an alternative to the total replacement of a defective composite resin restoration. Indications for such treatment include fractures 4; discolored or worn areas 2; poor anatomic form; secondary caries; tooth fracture and pain/sensitivity 12. Complete removal of defective composite restorations may lead to larger cavities with further loss of tooth structure 6, 10. Such treatment involves difficulties like recognizing the composite-tooth interface and the need for removing previously etched enamel to enable a new bonded restoration to be made 18, 20. Total replacement increases pulpal trauma and the cost of the procedure 6
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