Effect of the dentin smeared layer on tensile strength of cemented posts.
The tensile strengths for post lengths of 4 and 7 mm were compared in vitro with 3 different cementing media. In one group, the post preparation was rinsed with 5.25% NaOCl and in the other with 17% EDTA followed by 5.25% NaOCl. The EDTA-NaOCl flush had a profound effect when unfilled resin was used to cement the posts. A 4 mm post cemented with resin in the EDTA-NaOCl group was one and one-half times as retentive as a 7 mm post cemented with zinc phosphate and twice as strong as the 7 mm post with polycarboxylate cement. The 7 mm post cemented with the resin after the EDTA-NaOCl rinse was twice as resistant to displacement as the 7 mm post cemented with zinc phosphate and three times stronger than the polycarboxylate cement.
D017438:Bisphenol A-Glycidyl Methacrylate; D003442:Crowns; D003738:Dental Cements; D003804:Dentin / Q000648:ultrastructure*; D003781:Denture Retention; D004492:Edetic Acid / Q000008:administration & dosage; D006801:Humans; D011076:Polycarboxylate Cement; D011109:Polymethacrylic Acids; D011176:Post and Core Technique; D012388:Root Canal Irrigants / Q000008:administration & dosage; D012973:Sodium Hypochlorite / Q000008:administration & dosage; D013718:Tensile Strength; D015036:Zinc Phosphate Cement
D003738:Dental Cements; D011076:Polycarboxylate Cement; D011109:Polymethacrylic Acids; D012388:Root Canal Irrigants; D017438:Bisphenol A-Glycidyl Methacrylate; D015036:Zinc Phosphate Cement; D004492:Edetic Acid; D012973:Sodium Hypochlorite