Round robin test: wear of nine dental restorative materials in six different wear simulators - supplement to the round robin test of 2005.
OBJECTIVE
The purpose of the present study was to submit the same materials that were tested in the round robin wear test of 2002/2003 to the Alabama wear method.


METHODS
Nine restorative materials, seven composites (belleGlass, Chromasit, Estenia, Heliomolar, SureFil, Targis, Tetric Ceram) an amalgam (Amalcap) and a ceramic (IPS Empress) have been submitted to the Alabama wear method for localized and generalized wear. The test centre did not know which brand they were testing. Both volumetric and vertical loss had been determined with an optical sensor. After completion of the wear test, the raw data were sent to IVOCLAR for further analysis. The statistical analysis of the data included logarithmic transformation of the data, the calculation of relative ranks of each material within each test centre, measures of agreement between methods, the discrimination power and coefficient of variation of each method as well as measures of the consistency and global performance for each material.


RESULTS
Relative ranks of the materials varied tremendously between the test centres. When all materials were taken into account and the test methods compared with each other, only ACTA agreed reasonably well with two other methods, i.e. OHSU and ZURICH. On the other hand, MUNICH did not agree with the other methods at all. The ZURICH method showed the lowest discrimination power, ACTA, IVOCLAR and ALABAMA localized the highest. Material-wise, the best global performance was achieved by the leucite reinforced ceramic material Empress, which was clearly ahead of belleGlass, SureFil and Estenia. In contrast, Heliomolar, Tetric Ceram and especially Chromasit demonstrated a poor global performance. The best consistency was achieved by SureFil, Tetric Ceram and Chromasit, whereas the consistency of Amalcap and Heliomolar was poor. When comparing the laboratory data with clinical data, a significant agreement was found for the IVOCLAR and ALABAMA generalized wear method.


CONCLUSIONS
As the different wear simulator settings measure different wear mechanisms, it seems reasonable to combine at least two different wear settings to assess the wear resistance of a new material.
Heintze
S D
SD
R&D, Ivoclar Vivadent AG, Bendererstrasse 2, FL-9494 Schaan, Liechtenstein. siegward.heintze@ivoclarvivadent.com
Barkmeier
W W
WW
Latta
M A
MA
Rousson
V
V
D000180:Acrylic Resins / Q000737:chemistry; D000537:Aluminum Oxide / Q000737:chemistry; D000538:Aluminum Silicates / Q000737:chemistry; D001732:Bite Force; D003188:Composite Resins / Q000737:chemistry; D003723:Dental Amalgam / Q000737:chemistry; D003743:Dental Enamel; D003764:Dental Materials / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry; D019554:Dental Restoration Wear; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008422:Materials Testing / Q000379:methods; D008689:Methacrylates / Q000737:chemistry; D008897:Panicum; D019904:Polymethyl Methacrylate / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D012823:Silicate Cement / Q000737:chemistry; D013193:Stainless Steel / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014520:Urethane / Q000737:chemistry; D014867:Water / Q000737:chemistry
D000180:Acrylic Resins; D000538:Aluminum Silicates; D003188:Composite Resins; D003764:Dental Materials; D005899:Glass Ionomer Cements; C513708:Heliomolar; C075815:IPS-Empress ceramic; D008689:Methacrylates; D011140:Polyurethanes; C403464:SureFil packable composite; C121818:Tetric ceram; C110370:belleGlass; C113531:chromasit; C111282:dental polyglass; C091839:urethanetrimethacrylate; D014867:Water; D003776:Dental Porcelain; D013193:Stainless Steel; D012823:Silicate Cement; D014520:Urethane; C041332:amalcap; D003723:Dental Amalgam; D019904:Polymethyl Methacrylate; D000537:Aluminum Oxide