Survival of molar teeth improves with complex endodontic tre
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According to a study published by the Journal of Dentistry, the survival of molar teeth enhances when treated with complex endodontic treatment.

The objective of this retrospective practice-based study was to evaluate the survival of molar teeth and endodontic success after complex endodontic treatment up to 89 months.

Endodontically treated first and second molars were included. Open apices, combined surgical treatment, ETC score I, patients <18 years or with an ASA-score >2 were excluded. Cumulative survival estimates and Cox regression analysis were performed for tooth survival and endodontic healing according to the Glossary of Endodontic Terms. Restoration quality was assessed using the FDI criteria. Alpha was set at 0.05.

279 endodontically treated molars in 245 patients were included for survival analysis and 268 molars for endodontic success. The outcomes were;

--After 89 months, the cumulative survival was 91.7 %.

--The absence of adjacent teeth and deviance in root canal morphology significantly decreased the probability of tooth survival.

--Cumulative endodontic healing rates after 48 and 89 months were 82.2 % and 51.1 respectively.

--Deviance in root canal morphology and inadequate coronal seal significantly decreased the probability of endodontic healing.

--Indirect restorations obtained higher esthetic and biological FDI scores, however no difference between direct and indirect restorations were found concerning the functional FDI score.

Conclusively, After 89 months, the cumulative survival of molars in need of complex endodontic treatment was 91.7 %.

Source: https://doi.org/10.1016/j.jdent.2021.103611
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