The fate of root canals obturated with Thermafil: 10-year data for patients treated in a master’s program
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Retrospective description of the 10-year success rate of endodontic treatments with Thermafil (TF).
Materials and methods
Patients treated by postgraduate students in an Endodontics Master’s Program (2006–2008) were enrolled. All treated root canals were filled with TF and AH Plus. Teeth satisfying the inclusion criteria (206 teeth in 89 patients) were reexamined clinically and radiographically to estimate a 10-year survival and periapical health. Demographic and medical data were registered; collected information included pre-, intra-, and postoperative variables. Teeth were classified as “healthy” (PAI ≤ 2 in absence of signs/symptoms), “endodontically diseased” (presenting at least one of the following: PAI ≥ 3, signs/symptoms, retreated in the course of the follow-up, or extracted for endodontic reasons), or “non-endodontically diseased” (extracted for non-restorable fractures or periodontal disease). For teeth lost during the 10-year follow-up, details and reason of extraction were analyzed. Two PAI-calibrated examiners assessed outcomes blinded to preoperative status. Bivariate and multilevel analyses were performed (α level set at 0.05).
At 10 years, 179 (87%) teeth survived and 27 were extracted: 20 for non-endodontic reasons (excluded from success analysis) and 7 for endodontic reasons (considered “endodontically diseased”). Multilevel analysis revealed that the probability of extraction was increased by the presence of preoperative pain (odds ratio = 6.720; 95% confidence interval, 1.483–30.448) and by maxillary location (odds ratio = 2.950; 95% confidence interval, 1.043–8.347). Concerning periapical status, 159/186 teeth (85%) were assessed as “healthy.” Multilevel analysis confirmed that maxillary location (odds ratio = 3.908; 95% confidence interval, 1.370–11.146), presence of flare up (odds ratio = 9.914; 95% confidence interval, 2.388–41.163), and fracture occurrence (odds ratio = 35.412; 95% confidence interval, 3.366–372.555) decreased the odds of healing, respectively.
After 10 years, teeth filled with Thermafil in a specialist master’s program presented a survival and a periapical health comparable to cohorts where root canals were filled with other obturation techniques.
Carrier-based techniques provide time savings for clinicians while satisfying clinical quality criteria for the root filling and consequently the clinical outcome.
KeywordsCarrier-based system Clinical outcome Long term Retrospective study Survival
The work was supported by the Master of Clinical Endodontology, School of Dentistry, Department of Biomedical and Neuromotor Sciences (DIBINEM), Alma Mater Studiorum University of Bologna, Bologna, Italy.
Compliance with ethical standards
Conflict of interest
Chiara Pirani declares that she has no conflict of interest. Fausto Zamparini declares that he has no conflict of interest. Ove Peters serves as a consultant to Dentsply Sirona. Francesco Iacono declares that he has no conflict of interest. Maria Rosaria Gatto declares that she has no conflict of interest. Luigi Generali declares that he has no conflict of interest. Maria Giovanna Gandolfi declares that she has no conflict of interest. Carlo Prati declares that he has no conflict of interest.
All procedures performed in the present study were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
Informed consent was obtained from all individual participants included in the study.
Although a variety of Dentsply products have been provided to the University of Bologna as part of Dentsply’s global “School Grant Program,” Dentsply was neither aware of this study nor informed of the results prior to publication. Dr. Ove Peters serves as a consultant to Dentsply Sirona.
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