A Practice-based Study on the Survival of Restored
Endodontically Treated Teeth
Jovito Adiel Skupien, DDS, MSc,*‡ Niek Opdam, DDS, PhD,* Rolf Winnen, DDS, MSc,§
Ewald Bronkhorst, MSc, PhD,* Cees Kreulen, DDS, PhD,† Tatiana Pereira-Cenci, DDS, MSc, PhD,‡
and Marie-Charlotte Huysmans, DDS, PhD*
Abstract
Introduction: This retrospective study evaluated the
survival of endodontically treated teeth (ETTs) and
investigated factors influencing restoration and tooth
survival. Methods: Data from 795 ETTs were recorded,
and success (restoration still intact) and survival (resto-
ration intact or failed/repaired/replaced and tooth still in
situ) were analyzed using Kaplan-Meier statistics.
A multivariate Cox regression analysis was performed
to assess the variables influencing success and survival.
Results: At the end of the observation period (mean
observation time = 4.48 years), 45 teeth had been ex-
tracted (annual failure rate for survival = 1.9% at 9.6
years) and 114 restorations had received a restorative
follow-up treatment (annual failure rate for success =
4.9% at 9.6 years). Conclusions: ETTs showed acceptable survival and success in the long-term. Variables
showing significant influence on survival were the
number of teeth in the dentition and the presence of
decay at the moment the patient entered the practice.
(J Endod 2013;39:1335–1340)
Key Words
Clinical trial, dental restoration, endodontic treatment,
longevity, retrospective study, survival
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