مقايسه خارج دهاني استحكام برنشي باند چهار نوع باندينگ عاجي در دو لايه مختلف از عاج

An in vitro comparison study of shear bond strength of 4 dentin bondings in 2 different dentinal depths

Background & Aim: To determine the bond strength of four adhesive systems to either superficial or deep dentin. Methods & Materials: Eighty - eight extracted human impacted third molars had their crowns transversally sectioned either next to the occlusal DEJ or 1 mm above of the CEJ, to expose flat, superficial or deep dentin surface. The surfaces were bonded with: 1) Clearfil SE Bond (CSEB), 2) Single Bond (SB), 3) Scotch Bond MP (SBMP) and 4) Prompt L-POP (PLP) according to manufacturerʹs instruction. Composite build-ups were constructed incrementally with Z100. After storage in 25°C water, teeth were thermocycled. Then instron machine was used to measure the shear bond strength of each specimen with cross head speed of 1 mm/min. One way ANOVA and Tukey test were used to analyze the data. Results: Bond strength of SB, SBMP & SCEB performed equally when were bonded to superficial dentin; lowest value was obtained with PLP. On deep dentin, the bond strength of CSEB was significantly higher to superficial than to deep dentin. The rest of the adhesives showed almost similar bond strengths to both dentinal depths. Conclusion: CSEB & SBMP showed higher bond strength on both deep and superficial dentin. So, in regards to the results of this study, using these bondings in deep dentin areas is recommended.