title: The shear bond strength of resin-based composite to white mineral trioxide aggregate.
abstract: BACKGROUND
  It is unknown if resin-based composite can be placed on top of mineral trioxide aggregate (MTA) immediately after placement of the MTA. The authors aimed to measure the bond strength of a resin-based composite to white MTA (WMTA) with different bonding strategies at different intervals.
  
  
  METHODS
  The authors bonded resin-based composite to MTA with three bonding protocols (n = 45 per group) (group 1, total-etching adhesive; group 2, two-step self-etching adhesive; or group 3, one-step self-etching adhesive), immediately (subgroup A), 45 minutes (subgroup B) or 24 hours (subgroup C) after placement of the MTA. The authors measured shear bond strength by means of a universal testing machine and performed statistical analysis of the data by means of two-way and one-way analysis of variance (P < .05).
  
  
  RESULTS
  In all three groups, subgroup A demonstrated greater bond strengths than the other subgroups. Group/subgroup 3/A demonstrated the highest bond strength (mean [standard deviation] 49.2 [2.1] megapascals), which was significantly higher than that in all other groups (P < .05). This was followed by group/subgroup 1/A (40.2 [2.5] MPa), 2/A (38.4 [1.3] MPa) and 1/B (38.5 [1.91] MPa). The lowest bond strength was shown by group/subgroup 2/C (14.7 [1.90] MPa). There was a significant difference between the two-step and one-step self-etching adhesives at all three intervals (P < .05).
  
  
  CONCLUSIONS
  Within the limitations of this study, the representative one-step self-etching adhesive demonstrated the strongest bond to WMTA immediately after fabrication of MTA samples.
  
  
  CONCLUSIONS
  One-step self-etching adhesive may be used to bond resin-based composite to WMTA immediately after placement, thereby offsetting the need for a second appointment for permanent restoration.
authors.affiliation: Department of Conservative Dentistry and Endodontics, Saveetha Dental College, Saveetha University, Chennai, Tamil Nadu, India. prasanna_neelakantan@yahoo.com
authors.forename: Prasanna
authors.initials: P
authors.lastname: Neelakantan
authors.forename: Deeksha
authors.initials: D
authors.lastname: Grotra
authors.forename: Chandragiri Venkata
authors.initials: CV
authors.lastname: Subbarao
authors.forename: Franklin
authors.initials: F
authors.lastname: Garcia-Godoy
mesh_terms: D000180:Acrylic Resins; D017607:Aluminum Compounds / Q000737:chemistry; D000704:Analysis of Variance; D017610:Calcium Compounds / Q000737:chemistry; D003188:Composite Resins; D001840:Dental Bonding; D045662:Dental Etching / Q000379:methods*; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents; D004338:Drug Combinations; D010087:Oxides / Q000737:chemistry; D011109:Polymethacrylic Acids; D019279:Resin Cements / Q000737:chemistry*; D012387:Root Canal Filling Materials / Q000737:chemistry; D033081:Shear Strength; D017640:Silicates / Q000737:chemistry; D013997:Time Factors
chemical_list: D000180:Acrylic Resins; C489662:AdheSE cement; D017607:Aluminum Compounds; D017610:Calcium Compounds; C505694:Clearfil S3 Bond; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D004338:Drug Combinations; D010087:Oxides; D011109:Polymethacrylic Acids; C425843:Prime and Bond NT; D019279:Resin Cements; D012387:Root Canal Filling Materials; D017640:Silicates; C086631:mineral trioxide aggregate