title: In vitro comparison of three different lengths of remaining gutta-percha for establishment of apical seal after post-space preparation.
abstract: The quality of apical seal with regard to the length of remaining gutta-percha following post-space preparation is still controversial. The purpose of this in vitro study was to compare three different lengths of remaining gutta-percha for apical seal after post-space preparation. A total of 126 single-rooted extracted maxillary human anterior teeth with intact apices, straight roots, and without resorption were used in this study. The root canals were prepared and filled with gutta-percha and AH26 sealer. The post-space preparation was accomplished. Ninety-six teeth were randomly divided into three groups (4, 5 and 6 mm of gutta-percha was retained in group 1, 2 and 3, respectively).Thirty teeth were considered for the control groups in which 5 teeth served as positive and 5 teeth served as negative controls. The specimens were placed in India ink for 48 hours and then divided into two halves. The amount of leakage was observed and measured with a stereomicroscope at x 16 magnification and 0.1 mm accuracy. The results showed that there were significant differences among the three experimental groups (P < 0.05). The best apical seal after post-space preparation was associated with the maximum length of remaining gutta-percha in the apical portion of the treated teeth.
authors.affiliation: Department of Endodontics, Tabriz Dental School, Tabriz University (Medical Sciences), Tabriz, Iran.
authors.forename: Saeed
authors.initials: S
authors.lastname: Rahimi
authors.forename: Shahriar
authors.initials: S
authors.lastname: Shahi
authors.forename: Saeed
authors.initials: S
authors.lastname: Nezafati
authors.forename: Mohammad F
authors.initials: MF
authors.lastname: Reyhani
authors.forename: Sahar
authors.initials: S
authors.lastname: Shakouie
authors.forename: Leila
authors.initials: L
authors.lastname: Jalili
mesh_terms: D001729:Bismuth / Q000627:therapeutic use; D002244:Carbon; D004396:Coloring Agents; D001840:Dental Bonding; D003763:Dental Leakage / Q000145:classification; D004338:Drug Combinations; D004853:Epoxy Resins / Q000627:therapeutic use; D006171:Gutta-Percha / Q000737:chemistry / Q000627:therapeutic use*; D006801:Humans; D008422:Materials Testing; D011176:Post and Core Technique; D012387:Root Canal Filling Materials / Q000737:chemistry / Q000627:therapeutic use*; D012389:Root Canal Obturation; D018915:Root Canal Preparation / Q000379:methods*; D012834:Silver / Q000627:therapeutic use; D013499:Surface Properties; D014025:Titanium / Q000627:therapeutic use; D019227:Tooth Apex / Q000473:pathology*; D019553:Tooth, Nonvital / Q000473:pathology
chemical_list: D004396:Coloring Agents; D004338:Drug Combinations; D004853:Epoxy Resins; D012387:Root Canal Filling Materials; C028433:chinese ink; D012834:Silver; C028044:epoxy resin AH-26; D002244:Carbon; D006171:Gutta-Percha; D014025:Titanium; D001729:Bismuth