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Effect of calcium carbonate nanoparticles on the bonding strength of maxillofacial silicone to acrylic substrate    

**Fahd S. Ikram, *Salem A.L.Salem Al-Samarraie, **Jawad M. Mikaeel

*College of Dentistry, University of Sulaimani

**Hawler Medical University College of Dentistry, Erbil, Kurdistan region. Iraq.



The clinical life of a maxillofacial prosthesis averages about six months before it needs to be re-fabricated. Most of maxillofacial prosthesis attached to the acrylic resin via adhesive primers detached and have to be re-attached every few months. This in vitro study established to evaluate the effect of adding calcium carbonate nanoparticles at different concentrations on the bonding strength of maxillofacial silicone elastomer to the acrylic resin, before and after accelerated aging. Seventy samples were prepared, ten samples per each group. Each silicone sample sandwiched between two strips of acrylic resin via A-330-G adhesive primer. From each group five samples were undergoing accelerated aging. All samples were tested for shear bond strength by using Instron testing machine. Calcium carbonate nanoparticles have a significant effect on the shear bond strength of maxillofacial silicone to the acrylic resin and the groups that contain the lowest concentrations of calcium carbonate nanoparticles showed the most significant changes. It CaCO3 nanoparticles in trace amount can improve the shear bond strength of maxillofacial silicone elastomer to the acrylic resin after subjecting to accelerated aging.

Keywords: Maxillofacial silicone elastomers; calcium carbonate nanoparticles; A-330-G adhesive primer; acrylic

resin; shear bond strength.


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