Clinical evaluation of zirconia-based all-ceramic single crowns: an up to 12-year retrospective cohort study
- Cite this article as:
- Miura, S., Kasahara, S., Yamauchi, S. et al. Clin Oral Invest (2017). doi:10.1007/s00784-017-2142-y
Abstract
Objectives
This
study aims to investigate the incidence of clinical complications with
tooth-supported zirconia-based all-ceramic single crowns and identify
pertinent risk parameters.
Materials and methods
A
retrospective cohort study (May 2004 to April 2016) utilizing clinical
records of patients receiving yttrium-oxide–partially stabilized
zirconia (Y-TZP)-based all-ceramic crowns placed at Tohoku University
Hospital was performed. The length of time of treatment success
(complication event-free) and restoration survival (including minor
complication events and remaining clinically functional) were estimated
using Kaplan–Meier analysis. Multilevel survival analysis was used to
identify risk factors.
Results
One
hundred thirty-seven crowns were evaluated (mean follow-up time,
7.0 years). A total of 21 crowns experienced at least one complication
with fracture of veneering ceramic being the most common (16 crowns).
Estimated success and survival rates at 5 years (96.9 and 98.5%,
respectively) decreased at 10 years to 62.1 and 67.2%, respectively. The
risk of complications was significantly higher for molar crowns
compared to anterior crowns (p < 0.01). A significant association of complications with metal antagonist restorations was shown by univariate analysis (p < 0.01).
Conclusions
Given
the study limitations, Y-TZP single crowns placed on anterior teeth
demonstrated encouraging clinical results over a period of up to
10 years. However, there is a substantial risk of complications with
posterior teeth within 10 years of restoration placement.
Clinical relevance
Treatment
with zirconia-based all-ceramic crowns for molar teeth with metal
antagonist occlusion should be undertaken with caution.
Comments