Abstract:
:Thermal misfit is deemed as one reason for the chipping of veneered zirconia restorations. Aim of the present study was to assess the effect of thermal misfit on the fracture load of veneered zirconia frameworks and to evaluate the applicability of a universal veneering ceramic for both zirconia and titanium frameworks. Fracture loads of zirconia and titanium frameworks veneered with different ceramics were measured. Differences in the thermal expansion coefficients of core and veneer (Delta alpha), as well as differences between glass transition temperatures of the veneering ceramics and room temperature (Delta T)--which is considered as the effective temperature range for stress formation, were determined. In the zirconia group, fracture load ranged from 818.0 +/- 127.2 to 935.2 +/- 186.3 N without significant differences (Student's t-test, p < 0.05). Moreover, zirconia and titanium crowns veneered with the universal veneering ceramic revealed high fracture load. Results also showed a correlation to the product Delta alpha x Delta T, such that if 185 x 10(-6) < Delta alpha x Delta T < 1120 x 10(-6), a veneering ceramic adapted for titanium might be likewise applicable for zirconia.
journal_name
Dent Mater Jjournal_title
Dental materials journalauthors
Fischer J,Stawarczyk B,Tomic M,Strub JR,Hämmerle CHdoi
10.4012/dmj.26.766subject
Has Abstractpub_date
2007-11-01 00:00:00pages
766-72issue
6eissn
0287-4547issn
1881-1361journal_volume
26pub_type
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