The shear bond strength difference of 8th generation bonding on nanocomposite resin and nanohybrid composite resin

Abstract

Composite resins are increasingly being used in dentistry, particularly as restorative materials. There are currently nanoscale composite resins, such as nanocomposite resins and nanohybrid composite resins. Composite resins with smaller particle sizes can produce more aesthetically pleasing fillings. The disadvantage of composite resin as a restorative material is that it cannot bond directly to the tooth structure, so bonding as an intermediate material is required. Nano-sized particles are used in eighth-generation bonding, which is expected to increase bond strength. A total of 24 maxillary premolars were selected and randomly divided into 4 groups. Six maxillary premolars were in each group. Group I was treated with the application of nanocomposite resin without a bonding material, group II was treated with the application of a nanohybrid composite resin without a bonding material, group III was treated with the application of nanocomposite resin with an eighthgeneration bonding material, and group IV were treated with the application of nanohybrid composite resin with an eighthgeneration bonding material. The mean shear bond strength was 0.16 MPa, 0.51 MPa, 2.30 MPa, and 3.00 MPa, respectively. In conclusion, the eighth-generation bonding material has a higher shear bond strength on nanohybrid composite resin than it does on nanocomposite resin