title: Comparison of Shear Bond Strength and Microleakage of Various Bulk-fill Bioactive Dentin substitutes: An in vitro Study.
abstract: BACKGROUND
  Various bulk-fill materials depending on their composition, viscosity, and flow ability have different physical and mechanical properties. The aim of this in vitro study was to determine and compare the shear bond strength and microleakage properties of activa restorative with other bulk-fill restorative materials surefil (SDR), Biodentine, ever X posterior.
  
  
  METHODS
  Forty permanent premolars were selected for shear bond strength, and 20 permanent premolars were selected with class II cavities on mesial and distal side for microleakage. Universal testing device was used to assess the shear bond strength. Microleakage was checked using dye penetration method under a stereomicroscope. Mean and standard deviation values were calculated from the recorded values. Intergroup comparison was done by one-way analysis of variance (ANOVA) followed by pairwise comparison using Tukey honestly significant difference (HSD) post hoc test.
  
  
  RESULTS
  The mean shear bond strength was highest for SDR surefil followed by Ever X posterior, Bioactive restorative, and Biodentine respectively. In this study, SDR (surefil) showed better shear bond strength and better microleakage properties compared with the other test materials (F = 186.7157, p < 0.05).
  
  
  CONCLUSIONS
  The result of this study showed that flowable and fiber-reinforced composites have better shear bond strength and microleakage properties.
  
  
  CONCLUSIONS
  Flowable bulk-fill composite resins can be used as dentin substitutes because of its superior properties.
authors.affiliation: Department of Restorative Dental Sciences, King Saud University, College of Dentistry, Riyadh, Kingdom of Saudi Arabia.
authors.forename: Fahad I
authors.initials: FI
authors.lastname: Alkhudhairy
authors.affiliation: Department of Endodontics, College of Dentistry, King Saud University, Riyadh, Kingdom of Saudi Arabia, e-mail: zeeshan-a-h@yahoo.com.
authors.forename: Zeeshan H
authors.initials: ZH
authors.lastname: Ahmad
mesh_terms: D000704:Analysis of Variance; D001641:Bicuspid; D017610:Calcium Compounds; D003188:Composite Resins; D001840:Dental Bonding; D003731:Dental Caries / Q000628:therapy; D003763:Dental Leakage; D003793:Dental Restoration, Permanent; D006801:Humans; D066298:In Vitro Techniques; D008422:Materials Testing; D033081:Shear Strength; D017640:Silicates
chemical_list: D017610:Calcium Compounds; D003188:Composite Resins; D017640:Silicates; C553871:Surefil SDR Flow; C506393:tricalcium silicate
keywords: Bulk-fill; Dentin substitute; Microleakage Shear bond strength.