Abstract
Background The main aim of the retrospective cohort study was to evaluate tooth survival after the endodontic treatment over a period of more than 20 years. Moreover, success of the treatment and the correlation between baseline parameters and the outcomes were analyzed, and causes were recorded. Materials and Methods Clinical records (including radiographs) of subjects treated with endodontic procedures (both primary and secondary (nonsurgical retreatment)) were collected and analyzed, covering a period of up to 29 years. Type of the treatment, technique, adequacy of treatment performed, presence of baseline radiolucency, and symptoms at baseline were recorded. Moreover, failure (presence of radiolucency 2 years after treatment) and tooth extraction data and causes of them were recorded. Outcomes were explored by using survival analysis (Kaplan–Meier estimates and survival table analysis) and regression analysis (Cox regression). Results A total of 2,679 endodontically treated teeth were included in the analysis. After 20 years from the treatment, the cumulative survival rate for primary and secondary treatments was 84.10% (80.99%–87.21%) and 89.79% (86.68%–92.90%), respectively. No differences were found between primary and secondary treatments or with regard to the technique adopted. The presence of periapical radiolucency was correlated to higher odds of tooth extraction. Conclusions Despite the limitations of the study, we can assume that the proportion of retained endodontically treated teeth was significantly high over a long-term period.
Highlights
Background. e main aim of the retrospective cohort study was to evaluate tooth survival after the endodontic treatment over a period of more than 20 years
One study conducted by Salehrabi and Rotstein, published in 2004, reported the results about teeth survival after mining an insurance database of about 1,462,936 treated teeth [7]. e authors reported that 97% of teeth were retained in the oral cavity after 8 years from the treatment, and they found that teeth without crowns were, in general, more prone to be lost than teeth covered with prosthetic crowns
A total of 2,679 treatments in 1,097 subjects were included in the analysis, belonging to a population made of 59.4% of men (43.2 + − 14.6 years old)
Summary
Long-Term Follow-Up of Nonsurgical Endodontic Treatments Performed by One Specialist: A Retrospective Cohort Study about Tooth Survival and Treatment Success. E main aim of the retrospective cohort study was to evaluate tooth survival after the endodontic treatment over a period of more than 20 years. Tooth survival becomes an important factor to be considered when evaluating endodontic treatment outcomes over a long-term period [6]. E aim of the present study is to report long-term outcomes (up to 29 years) of endodontically treated teeth, focusing on survival rates and on factors influencing tooth retention in the oral cavity. E primary outcome was to evaluate the long-term (20 years or more) survival rate (CSR%) of endodontically treated teeth in a single private practice. Logistics regression models were used to evaluate the correlation between the presence of symptoms after the treatments and the outcome and between the subjective evaluation of the treatment and the outcome. e level of significance was set at P 0.05
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