The effects of five repair systems on shear bond strength between composite and two different infra structures after thermocycling

Abstract

Abstract:Purpose: The purpose of this in vitro study was to evaluate the effect of five ceramic repair systems on shear bond strength between composite and two infrastructures (zirconia and nickle chromium alloy) and to determine the mode of bond failure after thermocycling.Materials and Methods: Disc-like specimens (N=100) were made of two dental ceramic infrastructure materials (zirconia, nickle chromium alloy). All the specimens were polished with silicon carbide paper, prepared for bonding by surface modification with airborne particle abrasion. Each infrastructure groups were divided into five subgroups (n=10). They were bonded using five repair systems: 1. Bisco intraoral repair kit, 2. Clearfil repair system, 3. Ceramic repair system(ivoclar), 4. Ultradent ceramic repair system and 5. single bond adhesive. All specimens were repaired with hybrid composite. Bonded specimens were stored in 37°C distilled water for 24 h and were thermocycled at 5–55°C for 1200 cycles with a 30-sec dwell time and 5-sec transfer time. Shear bond strengths were determined with a mechanical testing device. And mode of failure was recorded for each group.Results: Infrastructure groups displayed the following values in megapascals: Zr (clearfil) =18,61±5,37, Zr (bisco) = 18,91±4.33, Zr (ultradent)= 6,63±1,5. Zr (ivocar) = 15,24±5,30, Zr(singlebond)=3,63±0,62, N-Cr(clearfil)=17,37±4,46, Ni- Cr(bisco)= 20,93±,2,63Ni-Cr(ultradent)=8,17±2,48, Ni-Cr (ivocar)= 17,37±4,46, Ni-Cr (single bond )= 10,33±3,55. Every repair system have no significant difference on repairing both Zr and Ni-Cr except single bond. Single bond was weekest for repairing Zr samples. The three repair systems (ivoclar, clearfil and bisco) had both mixed and adhesive failures. For single bond and ultradent groups all the spicemens were failed adhesively. The mode of failure result also supports that the three repair systems (ivoclar, clearfil and bisco) were better than single bond and ultradent repair systems.Conclusion: The three repair systems (ivoclar, clearfil and bisco) were more effective than the other two systems for repairing both infrastructures and their mode of failures were both mixed and adhesive.