• DOI:10.15406/JDHODT.2016.05.00148
• Corpus ID: 22187406

An In-Vitro Assessment of Micro-Shear Bond Strength of a Nano Adhesive to Dentin with Different types of Composite Restorative Systems

@article{Shamrani2016AnIA,
  title={An In-Vitro Assessment of Micro-Shear Bond Strength of a Nano Adhesive to Dentin with Different types of Composite Restorative Systems},
  author={Ammar Saleh Al Shamrani},
  journal={Journal of dental health, oral disorders \& therapy},
  year={2016},
  volume={5}
}

• A. Shamrani
• Published 30 September 2016
• Materials Science, Medicine
• Journal of dental health, oral disorders & therapy

Nearly half of all dental restorations fail within 10 years and replacing this account for 50–70% of all restorative dentistry [1]. Composites are popular restorative materials because of their esthetics and direct-filling capabilities [2-8]. One main problem, however, is that composite tend to accumulate more biofilm than other restorative materials in vivo [9-11]. Biofilms at the restoration margins could produce acids and cause secondary caries, one of the main reasons for restoration failure [12,13]. In addition to this, the polymerizations of resin based composites generate stresses due to their contraction. Shrinkage stress occurs when the contraction is obstructed and the material is rigid enough to resist sufficient plastic flow to compensate for the original volume. The magnitude of contraction stresses is highly dependent on the visco-elastic properties of the material [14]. Clinically, these stresses may be transferred to the margins of the restoration, possibly affecting marginal quality [15]. When marginal quality is not adequate, problems like leakage, recurrent caries and pulpal irritation may occur [16,17]. Even by considering that an absolutely perfect marginal seal is not achievable clinically, a good marginal seal should be the main objective for clinicians. Restorative materials and placement techniques are widely recognized as a major factor in the modification of shrinkage stresses [18]. The introduction of nano composites has significantly reduced the micro leakage and improved the overall marginal quality. Nano composites can be roughly classified into two categories: one is intercalated nano composites and the other is exfoliated. An intercalated nano composite, in which the silicate is well-dispersed in a polymer matrix with polymer chains inserted into silicate layers that retain their lateral order, and exfoliated nanocomposites where the silicate platelets become fully separated or delaminated, essentially individually dispersed in the polymer matrix [19]. Recently introduced Bulk Fill composites also possess specific characteristics, including enhanced flowability to achieve consistent adaptation to the cavity preparation. Elasticity and low polymerization shrinkage stress reduce micro leakage, postoperative sensitivity, and secondary caries. Improved depth of cure of at least 4 mm eliminates the need for layering [20]. The recent introduction of the Sonic Fill (Kerr corp, USA) combines the attributes of a low viscosity composite and a universal composite. By activating the composite with sonic energy, it is possible to fill the cavity and adapt the low viscosity material easily and then compact and model it while the composite changes its consistency until it reaches a higher viscosity. As per the manufacturer, the advantages are reduced working time and polymerization shrinkage, better adaptation to cavity walls and ease of use [21]. The purpose of this study was to evaluate micro-shear bond strength of a nanofilled Composite, Tetric EvoCeram Bulk fill and Sonic Fill Bulk fill composites bonded with a nano reinforced adhesive nano bond. Volume 5 Issue 2 2016