Document Detail

ZrO2 three-unit fixed partial dentures: comparison of failure load before and after exposure to a mastication simulator.
MedLine Citation:
PMID:  17371566     Owner:  NLM     Status:  MEDLINE    
This study evaluated the failure load of different zirconia-based all-ceramic fixed partial dentures (FPD) before and after artificial aging. Forty-eight zirconia frameworks for three-unit FPDs were fabricated using different manufacturing systems [(DCS), Procera (Nobel Biocare) and Cerec inLab (Sirona)], veneered using Vita VM9 (Vita Zahnfabrik) opaque ceramic and conventionally cemented on human teeth. The restorations were divided according to the system used for manufacturing the frameworks into three groups of 16 specimens each (DCS, Procera and Vita YZ-Cerec). Half of each group was artificially aged through dynamic loading and thermal cycling, whereas, the other half was not subjected to artificial aging. Subsequently, all specimens were loaded occlusally until fracture occurred using a universal testing machine. Pair-wise Wilcoxon rank tests were performed to test for differences in failure loads at a statistical significance level of 0.05. All specimens subjected to artificial aging survived with no failures. The median (IQR=x0.25-x0.75) failure loads (N) before and after artificial aging were, respectively, as follows: group DCS, 2131 (1948-2239) and 1797 (1590-2074); group Procera, 1684 (1615-1873) and 1394 (1275-1495); and group Vita YZ-Cerec, 1845 (1621-1923) and 1625 (1521-1747). No significant differences were found for comparisons between different groups before artificial aging. After artificial aging, group Procera showed significantly smaller values than group DCS (P=0.042). All tested restorations have the potential to withstand occlusal forces applied in the posterior region and can therefore represent interesting alternatives to replace metal-ceramic restorations. Further assessments are needed before recommending these restorations for daily practice.
W Att; M Grigoriadou; J R Strub
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of oral rehabilitation     Volume:  34     ISSN:  0305-182X     ISO Abbreviation:  J Oral Rehabil     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2007-03-20     Completed Date:  2007-06-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0433604     Medline TA:  J Oral Rehabil     Country:  England    
Other Details:
Languages:  eng     Pagination:  282-90     Citation Subset:  D; IM    
Department of Prosthodontics, Faculty of Dentistry, Albert-Ludwigs University, Freiburg, Germany.
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MeSH Terms
Dental Materials*
Dental Porcelain
Dental Restoration Failure*
Dental Stress Analysis / methods
Denture Design / methods
Denture, Partial, Fixed*
Mastication / physiology*
Metal Ceramic Alloys
Stress, Mechanical
Time Factors
Reg. No./Substance:
0/Ceramics; 0/Dental Materials; 0/Metal Ceramic Alloys; 0/Procera; 12001-21-7/Dental Porcelain; 1314-23-4/zirconium oxide; 131552-79-9/Cerec; 7440-32-6/Titanium; 7440-67-7/Zirconium

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