Five-year results of a prospective randomised controlled clinical trial of posterior computer-aided design–computer-aided manufacturing ZrSiO4-ceramic crowns
Passia, N., Stampf, S. and Strub, J. R. (2013), Five-year results of a
prospective randomised controlled clinical trial of posterior
computer-aided design–computer-aided manufacturing ZrSiO4-ceramic crowns. Journal of Oral Rehabilitation. doi: 10.1111/joor.12075
Summary
The aim of this prospective randomised controlled clinical trial was to evaluate the clinical outcome of shrinkage-free ZrSiO4-ceramic
full-coverage crowns on premolars and molars in comparison with
conventional gold crowns over a 5-year period. Two hundred and
twenty-three patients were included and randomly divided into two
treatment groups. One hundred and twenty-three patients were restored
with 123 ZrSiO4-ceramic
crowns, and 100 patients received 100 gold crowns, which served as the
control. All crowns were conventionally cemented with glass–ionomer
cement. After an observation period of 6, 12, 24, 36, 48 and 60 months,
the survival probability (Kaplan–Meier) for the shrinkage-free ZrSiO4-ceramic
crowns was 98·3%, 92·0%, 84·7%, 79% and 73·2% and for the gold crowns,
99%, 97·9%, 95·7%, 94·6% and 92·3%, respectively. The difference between
the test and control group was statistically significant (P = 0·0027).
The gold crowns showed a better marginal integrity with less marginal
discoloration than the ceramic crowns. The most common failure in the
ceramic crown group was fracture of the crown. The 60-month results of
this prospective randomised controlled clinical trial suggest that the
use of these shrinkage-free ZrSiO4-ceramic crowns in posterior tooth restorations cannot be recommended.
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