title: An evaluation of shear bond strength of self-etch adhesive on pre-etched enamel: an in vitro study.
abstract: OBJECTIVE
  To determine the shear bond strength of self-etch adhesive G-bond on pre-etched enamel.
  
  
  METHODS
  Thirty caries free human mandibular premolars extracted for orthodontic purpose were used for the study. Occlusal surfaces of all the teeth were flattened with diamond bur and a silicon carbide paper was used for surface smoothening. The thirty samples were randomly grouped into three groups. Three different etch systems were used for the composite build up: group 1 (G-bond self-etch adhesive system), group 2 (G-bond) and group 3 (Adper single bond). Light cured was applied for 10 seconds with a LED unit for composite buildup on the occlusal surface of each tooth with 8 millimeters (mm) in diameter and 3 mm in thickness. The specimens in each group were tested in shear mode using a knife-edge testing apparatus in a universal testing machine across head speed of 1 mm/ minute. Shear bond strength values in Mpa were calculated from the peak load at failure divided by the specimen surface area. The mean shear bond strength of all the groups were calculated and statistical analysis was carried out using one-way Analysis of Variance (ANOVA).
  
  
  RESULTS
  The mean bond strength of group 1 is 15.5 Mpa, group 2 is 19.5 Mpa and group 3 is 20.1 Mpa. Statistical analysis was carried out between the groups using one-way ANOVA. Group 1 showed statistically significant lower bond strength when compared to groups 2 and 3. No statistical significant difference between groups 2 and 3 (p < 0.05).
  
  
  CONCLUSIONS
  Self-etch adhesive G-bond showed increase in shear bond strength on pre-etched enamel.
authors.affiliation: Professor, Department of Conservative Dentistry and Endodontics Saveetha Dental College, Chennai, Tamil Nadu, India.
authors.forename: Bhadra
authors.initials: B
authors.lastname: Rao
authors.affiliation: Senior Lecturer, Department of Conservative Dentistry and Endodontics Lenora Dental College, Rajahmundry, Andhra Pradesh, India e-mail: sattireddi@gmail.com.
authors.forename: Satti Narayana
authors.initials: SN
authors.lastname: Reddy
authors.affiliation: Reader, Department of Conservative Dentistry and Endodontics Bapuji Dental College and Hospital, Davanagere, Karnataka, India.
authors.forename: Abdul
authors.initials: A
authors.lastname: Mujeeb
authors.affiliation: Reader, Department of Conservative Dentistry and Endodontics Dr DY Patil Dental College, Mumbai, Maharashtra, India.
authors.forename: Kanchan
authors.initials: K
authors.lastname: Mehta
authors.affiliation: Reader, Department of Conservative Dentistry and Endodontics Pullareddy Dental College, Kurnool, Andhra Pradesh, India.
authors.forename: G
authors.initials: G
authors.lastname: Saritha
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D055117:Curing Lights, Dental / Q000145:classification; D001840:Dental Bonding; D003743:Dental Enamel / Q000648:ultrastructure*; D003764:Dental Materials / Q000737:chemistry; D003799:Dental Stress Analysis / Q000295:instrumentation; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D055115:Light-Curing of Dental Adhesives / Q000379:methods; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D033081:Shear Strength; D013314:Stress, Mechanical; D013499:Surface Properties
chemical_list: D003188:Composite Resins; D003764:Dental Materials; D017220:Dentin-Bonding Agents; C444701:Filtek Z250; C498353:G-Bond; D008689:Methacrylates; C115612:single bond; D017438:Bisphenol A-Glycidyl Methacrylate