| Objective: The purpose of this in vitro study was to assess theinfluence of different root canal obturation techniques on the resistance tovertical root fracture of endodontically treated teeth when thematched-taper single-cone, warm vertical compaction or lateralcondensation technique was used.Methods: Sixty extracted single-canal mandibular premolar teethwere sectioned, leaving a standard root length of12mm. The buccolingualand mesiodistal diameters were measured, and the teeth were randomlydivided into5groups (n=12). There was no statistically significantdifference between the groups in terms of the diameters. In group1(control group), no instrumentation or obturation was performed. Therest of the roots were chemo-mechanically prepared with nickel-titaniumProTaper rotary instruments up to size F3at the working length. Group2was left unobturated. Groups3,4and5were obturated with the matched-taper single-cone,warm vertical compaction and lateralcondensation techniques using AH Plus, respectively. All of the roots weremounted vertically in self-curing acrylic resin blocks that exposed7mmof the coronal part. Then the roots were subjected to a vertical loadingforce (1mm/min) under the universal testing machine. The force requiredto produce root fracture was recorded in newtons. The data were analyzedby using Kruskal–Wallis and Nemenyi tests (P <.05) with SAS9.0.Results:There is significant difference between the root canal prepared butnot obturated group and the control group (p<0.05). In addition, there wasno difference between the root canal obturated groups and controlgroup(p>0.05); furthermore, these obturation techniques did not create astatistically different resistance to vertical fracture (p>0.05).Conclusion: Root canal preparation significantly weakens the teeth‘s fracture resistance which, however, can be compensated by root canalobturation; fracture resistance among roots obturated with differenttechniques doesn’t show significant difference. |
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