title: Rigidity, retention, and resistance of titanium versus double taper light root canal posts: an in vitro evaluation.
abstract: OBJECTIVE
  to evaluate and compare the physical properties of titanium posts and double taper (DT) light posts.
  
  
  METHODS
  Sixty posts (30 titanium post and 30 DT light post) were selected and divided into three groups. In Group I: Ten posts of each type were subjected to a three-point bending test. In Group II: 20 posts extracted maxillary central incisors were restored with ten posts of each type and subjected to tensile loading. In Group III: 20 posts extracted maxillary central incisors were restored with ten posts of each type and subjected to compressive loading at an angle of 135°.
  
  
  RESULTS
  The results showed that DT light posts were significantly less rigid (P <0.001), more retentive and significantly less resistant to fracture (P <0.001) as compared to titanium posts.
  
  
  CONCLUSIONS
  It is suggested that although the DT light post system does not completely fulfill the requirements claimed by manufacturer but it would meet the requirements to combat the physiological forces operating in the oral cavity.
authors.affiliation: Department of Conservative Dentistry and Endodontics, Sri Guru Ram Das Institute of Dental Sciences and Research, Amritsar, Punjab, India. doctorramneek@hotmail.com
authors.forename: Ramneek
authors.initials: R
authors.lastname: Khatter
authors.forename: Ripu Daman
authors.initials: RD
authors.lastname: Singh
authors.forename: Renu
authors.initials: R
authors.lastname: Sroa
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D019245:Compressive Strength; D003764:Dental Materials / Q000737:chemistry*; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention; D003786:Dental Pulp Cavity / Q000033:anatomy & histology; D003799:Dental Stress Analysis / Q000295:instrumentation; D017220:Dentin-Bonding Agents / Q000737:chemistry; D055119:Elastic Modulus; D004548:Elasticity; D006801:Humans; D008422:Materials Testing; D063065:Organophosphonates / Q000737:chemistry; D018583:Pliability; D011109:Polymethacrylic Acids / Q000737:chemistry; D011176:Post and Core Technique / Q000295:instrumentation*; D011791:Quartz / Q000737:chemistry*; D019279:Resin Cements / Q000737:chemistry; D013314:Stress, Mechanical; D013718:Tensile Strength; D014025:Titanium / Q000737:chemistry*; D019553:Tooth, Nonvital / Q000628:therapy
chemical_list: C433205:Calibra; D003764:Dental Materials; D017220:Dentin-Bonding Agents; D063065:Organophosphonates; D011109:Polymethacrylic Acids; C103500:Prime & Bond; D019279:Resin Cements; C454540:Scotchbond etchant; D011791:Quartz; D017438:Bisphenol A-Glycidyl Methacrylate; D014025:Titanium