The authors would like to inform the readers of a needed clarification in this article:

There is miscalculation in fracture toughness values presented in article. The corrected values are 0.9 MPa m ^1/2 for Filtek Bulk Fill, 1.1 MPa m ^1/2 for Voco X-tra base, 1.2 MPa m ^1/2 for Venus Bulk Fill, 1.2 MPa m ^1/2 Tetric EvoCeram Bulk Fill, 1.7 MPa m ^1/2 for Alert, 1.8 MPa m ^1/2 for SonicFill, 1.8 MPa m ^1/2 for SDR and 2.9 MPa m ^1/2 XENIUS base. This will affect the fracture toughness values presented in abstract (page 835), Figure 1 (page 838) and those presented in results and discussion chapters (pages 838 and 839).

The authors would like to apologize for any inconvenience caused.