Comparative Evaluation of Shear Bond Strength between Self-Adhesive Resin Composite and Different Adhesive Systems to Dentin at Different Storage Times (In Vitro Study)

E. Abd El-Naby, Saad; I. Mohammed, Nady; A. Abd El-Ghany, Ahmed

doi:10.21608/ajdsm.2020.71473

Comparative Evaluation of Shear Bond Strength between Self-Adhesive Resin Composite and Different Adhesive Systems to Dentin at Different Storage Times (In Vitro Study)

Document Type : Original Article

Authors

¹ Demonstrator, Department of Operative dentistry, Faculty of Dental Medicine, al Azhar University, Assuit.

² Assistant Professor Department of Operative dentistry, Faculty of Dental Medicine boys, al Azhar University. Cairo.

³ Lecturer, Department of Operative dentistry, Faculty of Dental Medicine, al Azhar University, Assuit.

10.21608/ajdsm.2020.71473

Abstract

Aim: This study was directed to evaluate the shear bond strength between self-adhesive resin composite and different adhesive systems to dentin at different storage times. Materials and method: Extracted human premolars teeth (n=99) were used, where their occlusal surfaces were prepared. Specimens were divided into three equal main groups according to the adhesive system used. (A1; Self-adhesive flowable composite, A2; One step self-etch adhesive system, A3; Two-steps etch and rinse adhesive system). Then each main group was subdivided according the storage time into three equal subgroups (B1; 24 hours, B2; Three months, B3; Six months) The final assembly was mounted on a universal testing machine (Lloyd instruments, LR 5K, England). A shear load was applied at a crosshead speed of 0.5 mm/min. until failure occurred. The data was recorded using computer software (Nexygen-MT Lloyd Instruments). Results: A statistically significant difference in shear bond strength was found between all the adhesive groups. After instrumentation where (p≤0.001). Also, a statistically significant difference in shear bond was found between three months and six months groups for all adhesives where (p≤0.001). Conclusion: Self-adhering flowable composite has poor bond strength to dentin and storage in water for long periods has a highly significant adverse effect on bond strength.