Abstract
Statement of Problem
Scientific data about the long-term survival of teeth treated with cast post and cores
are scarce. Retrospective studies often use different target events for their analyses.
A comparison is therefore complicated. For associated tooth-, jaw-, and patient-related
factors little evidence exists as to their effect on survival.
Purpose
The purpose of this study was to extend the knowledge on the survival of teeth treated
with cast post and cores for observation periods of more than 10 years. A decrease
or increase in survival times according to the presence or absence of associated parameters
needs to be evaluated.
Material and Methods
A retrospective evaluation was conducted of all cast post and cores inserted in 1
university clinic between January 1992 and June 2011. A Kaplan-Meier survival analysis
was carried out by using extraction as the target event. The survival curves for different
tooth types, the presence or absence of adjacent teeth, and the prosthetic restoration
of the respective jaws were compared by using the log-rank test (α=.05). A Cox regression
model was calculated for multivariate analyses.
Results
A total of 717 cast post and cores for 343 patients were recorded. The mean survival
time was 13.5 years. A statistically significant decrease in survival times was found
for canines (11.9 years) and premolars (13.4 years) versus molars (14.1 years), no
adjacent teeth (10.6 years) versus at least 1 adjacent tooth (13.8 years), and the
restoration with removable dental prostheses (12.5 years) versus fixed dental prostheses
and single crowns (13.9 years). The largest reduction in survival time was found for
teeth being used as an abutment for a double crown-retained removable partial dental
prosthesis (telescopic denture) (9.8 years). Tooth type and adjacent tooth status
remained as significant variables within the multivariate Cox regression model.
Conclusions
Cast post and cores have an acceptable long-term survival time. Because different
factors may influence survival, considering these factors in treatment planning may
increase the long-term success of these restorations.
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Article info
Publication history
Published online: April 07, 2015
Identification
Copyright
© 2015 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.
