title: Comparison of different techniques for obturating experimental internal resorptive cavities.
abstract: Forty extracted maxillary central incisors were instrumented at the working length to a #50 file. The roots were sectioned transversely with a diamond disk at 7 mm from the anatomical apex. At the opening of the root canal of each section, hemicircular cavities were drilled with a specially designed bur. The corresponding root sections were cemented with glue, thus obtaining root canals with similar cavities that simulated internal resorptions. Teeth were embedded in plaster casts to facilitate their handling. The specimens were randomly separated into four groups of 10. The following obturation techniques were evaluated: lateral compaction (group A), hybrid technique (group B), Obtura II (group C), and Thermafil (group D). AH26 was used as the sealer. After obturation, the plaster was removed and the teeth were radiographed in buccolingual and mesiodistal directions to evaluate the quality of the obturation at the IRC. The incisors were then cut with a scalpel at the same level as the previous section, to examine, under a stereomicroscope, the type of material that filled the IRC. Obtura II gave the best results and in most of the specimens obturated with this technique, the IRC were filled mainly with gutta-percha. Statistical analysis of the data indicated that the differences between group C and the other groups were significant (P < 0.05).
authors.affiliation: Department of Endodontics, School of Dentistry, Universidad del Salvador-Asociación Odontológica Argentina, Buenos Aires, Argentine Republic.
authors.forename: F
authors.initials: F
authors.lastname: Goldberg
authors.forename: E J
authors.initials: EJ
authors.lastname: Massone
authors.forename: M
authors.initials: M
authors.lastname: Esmoris
authors.forename: D
authors.initials: D
authors.lastname: Alfie
mesh_terms: D001729:Bismuth / Q000627:therapeutic use; D003786:Dental Pulp Cavity / Q000000981:diagnostic imaging / Q000473:pathology; D003788:Dental Pulp Diseases / Q000000981:diagnostic imaging / Q000628:therapy*; D004338:Drug Combinations; D004853:Epoxy Resins; D006171:Gutta-Percha / Q000627:therapeutic use; D006801:Humans; D007180:Incisor; D008709:Methenamine / Q000627:therapeutic use; D010969:Plastics / Q000627:therapeutic use; D011336:Probability; D011859:Radiography; D012387:Root Canal Filling Materials / Q000627:therapeutic use; D012389:Root Canal Obturation / Q000379:methods*; D012834:Silver / Q000627:therapeutic use; D013499:Surface Properties; D014025:Titanium / Q000627:therapeutic use; D014091:Tooth Resorption / Q000000981:diagnostic imaging / Q000628:therapy*
chemical_list: D004338:Drug Combinations; D004853:Epoxy Resins; D010969:Plastics; D012387:Root Canal Filling Materials; C113130:obtura II; D012834:Silver; C028044:epoxy resin AH-26; D006171:Gutta-Percha; D014025:Titanium; D008709:Methenamine; D001729:Bismuth