Fiber-post bond strength in canals obturated with a cross-linked gutta-percha core obturator.
The aim of this in-vitro study was to evaluate the bond strength of fiber posts cemented in a root canal filled using various root-canal obturation techniques. A total of 33 monoradicular samples, treated endodontically, were randomly assigned to three groups according to the root-canal obturation technique: group 1, continuous-wave technique; group 2, plastic-obturator-core technique; and group 3, cross-linked gutta-percha obturator-core technique. Fiber posts were luted in each sample and each was sectioned perpendicular to the post axis. The push-out test was performed using a universal machine and the maximum failure load was recorded in MPa mm(-2) . Several samples were randomly chosen for scanning electron microscopy evaluation. The mean debris and dentinal tubule-opening scores were calculated separately in the coronal and apical portions. Bond strength was significantly higher in group 1 than in groups 2 and 3. Debris scores were significantly higher in the apical portion of groups 2 and 3 than in group 1. Within the limitations of this study it can be affirmed that thermoplasticized alpha gutta-percha seemed to worsen the cleaning of post-space walls and hence reduced fiber-post bond strength.
Department of Surgical Sciences, Dental School Lingotto, University of Turin, Turin, Italy.
Nicola
N
Scotti
Francesco A
FA
Coero Borga
Mario
M
Alovisi
Emanuele
E
Bergantin
Silvia
S
Marchionni
Damiano
D
Pasqualini
Elio
E
Berutti
D003432:Cross-Linking Reagents / Q000737:chemistry; D001840:Dental Bonding; D003764:Dental Materials / Q000737:chemistry*; D003786:Dental Pulp Cavity / Q000648:ultrastructure; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure; D006171:Gutta-Percha / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D011176:Post and Core Technique / Q000295:instrumentation*; D012387:Root Canal Filling Materials / Q000737:chemistry; D012389:Root Canal Obturation / Q000295:instrumentation / Q000379:methods*; D018915:Root Canal Preparation / Q000379:methods; D013314:Stress, Mechanical; D013499:Surface Properties; D019227:Tooth Apex / Q000648:ultrastructure; D019553:Tooth, Nonvital / Q000628:therapy
D003432:Cross-Linking Reagents; D003764:Dental Materials; D012387:Root Canal Filling Materials; D006171:Gutta-Percha
endodontic obturation technique; fiber post; push-out; scanning electron microscopy