title: Comparative evaluation of the regional micro-push-out bond strength of custom-made resin post system with a prefabricated resin post: an in vitro study.
abstract: OBJECTIVE
  The purpose of the study is to compare the regional micro-push-out bond strength of custom-made resin post and a prefabricated resin post luted using self-etch adhesive and/or etch and rinse adhesive system at various regions.
  
  
  METHODS
  Forty freshly extracted human maxillary central incisors were selected for this study; 1.5-2-mm coronal to the cemento-enamel junction was removed with a diamond disk using a slow speed handpiece under cooling water. Working lengths were established, root canals were sequentially enlarged upto the apex until ISO size 50-K-file and obturated using gutta-percha and AH plus sealer by cold lateral compaction. Post spaces were prepared to a depth of 10 mm using paeso-reamer upto size #3. After preparation, each specimen was embedded in chemically cured acrylic resin. The roots were randomly assigned to four groups: Group I: Custom-made resin post+Self-etch adhesive, Group II: Glass FRC post+Self-etch adhesive, Group III: Custom-made resin post+Etch and Rinse adhesive, Group IV: Glass FRC post+Etch and Rinse adhesive. Fabrication of custom-made resin post was done. All the posts were cemented using a dual cure resin luting cement. Each root was sectioned perpendicular to the long axis using a microtome and subjected to micro-push-out bond strength.
  
  
  RESULTS
  The micro-push-out bond strength in the coronal region, in Group I 13.5 ± 1.66 MPa, Group II 12.08 ± 0.8 MPa, Group III 11.15 ± 1.06 MPa, Group IV 11.81 ± 1.11 MPa. In the middle third region: Group I 11.43 ± 0.740 MPa, Group II 10.584 ± 0.504 MPa, Group III 10.0582 ± 0.830 MPa, Group IV 10.35 ± 0772 MPa. In the apical third: Group I 10.38 ± 0.878 MPa, Group II 9.59 ± 1.06 MPa, Group III 9.34 ± 0.73o MPa, Group IV 8.77 ± 1.02 MPa.
  
  
  CONCLUSIONS
  Within the limitations of the study, amongst all the four groups tested, custom-made resin post luted with self-etch system (CMPR-SE) showed higher micro-push-out bond strength values in all regions when compared to the other groups.
authors.affiliation: Department of Conservative Dentistry and Endodontics, Meenakshi Ammal Dental College and Hospital, Alapakkam Main Road, Maduravoyal, Chennai, India.
authors.forename: S
authors.initials: S
authors.lastname: Ranjithkumar
authors.forename: N
authors.initials: N
authors.lastname: Velmurugan
authors.forename: Anna
authors.initials: A
authors.lastname: Roy
authors.forename: S
authors.initials: S
authors.lastname: Hemamalathi
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D002484:Cementation / Q000379:methods; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003764:Dental Materials / Q000737:chemistry*; D017267:Dental Prosthesis Design; D003786:Dental Pulp Cavity / Q000648:ultrastructure; D003804:Dentin / Q000648:ultrastructure; D017220:Dentin-Bonding Agents / Q000737:chemistry; D005898:Glass / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D010756:Phosphoric Acids / Q000737:chemistry; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements / Q000737:chemistry; D012389:Root Canal Obturation / Q000379:methods; D018915:Root Canal Preparation / Q000295:instrumentation / Q000379:methods; D055116:Self-Curing of Dental Resins; D013314:Stress, Mechanical; D019227:Tooth Apex / Q000648:ultrastructure
chemical_list: D003188:Composite Resins; D003764:Dental Materials; D017220:Dentin-Bonding Agents; C444701:Filtek Z250; D010756:Phosphoric Acids; D019279:Resin Cements; C090969:Tetric; C009753:fiberglass; C115612:single bond; D017438:Bisphenol A-Glycidyl Methacrylate; C030242:phosphoric acid