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Chugal NM, Clive JM et al. Oral Surg 2007; 104: 576–582

Coronal leakage is considered a re-infection risk in endodontics. However, there is little evidence on the effect of early permanent restoration of endodontically treated teeth. In this study, data were obtained initially for 441 root canals in 200 teeth in 120 patients.

At follow-up 4 ± 0.5 yrs later, permanently restored teeth/roots (n = 375) had a success rate of 80%, compared with 60% of teeth/roots (30) with temporary restorations. However, teeth with normal preoperative periapical condition were significantly more likely to be restored with a cast restoration than teeth without. When initial periapical status was controlled in the analysis, there was no significant association between endodontic success and the presence of a permanent restoration.