›› 2013, Vol. 4 ›› Issue (2): 91-94.

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Study on the surface morphology and bond strength of aged composite resin

  

  • Received:2012-12-20 Revised:2013-05-20 Online:2013-06-25 Published:2013-06-26

Abstract: Objective:To determine the change of morphology and micro-tensile strength between fresh and aged composite resin. Methods:After being stored in distilled water at 37 ℃ for a month, ten specimens were used as substrate for the new Z350 composite to adhere to. Specimens were then tested for the micro-tensile bond strength (μTBS) in a universal testing machine at a crosshead speed of 1 mm/min until failure. The surface and incisal surface morphology was analyzed using stereoscopic microscope and scanning electron microscope. Results:μTBS of aged composite resin was significantly lower than that of the fresh resin composite. The nano particles vanished from the resin matrix on the surface of aged composite resin. A rough resin-resin interface appeared between fresh and aged composite resin. Conclusions:The surface of aged composite resin may affect the bond strength between fresh and aged composite resin.