Three-body wear of resin denture teeth with and without nanofillers
Statement of problem
The wear behavior of newly developed denture teeth with nanofillers may be different from teeth with other chemical formulations.
Purpose
The purpose of this study was to examine the 3-body wear resistance of 11 different commercially available resin denture teeth.
Material and methods
The materials tested were conventional (SR Orthotyp PE, Orthognath) and cross-linked acrylic resin teeth without inorganic fillers (Premium 8, SR Postaris DCL, Trubyte Portrait, Artiplus), composite resin teeth with inorganic fillers (SR Orthosit PE, Vitapan), and composite resin teeth (experimental materials) with inorganic nanofillers (NC Veracia Posterior, e-Ha, Mondial). Human enamel and a ceramic denture tooth (Lumin Vacuum) were used as reference materials. The 3-body wear test was performed in a wear machine developed by the Academic Center for Dentistry Amsterdam (ACTA), with millet suspension acting as an abrasive medium (n=10, test load: 15 N, slip rate: 20%, number of cycles: 100,000). Wear was determined with the aid of a profilometer. Data were analyzed with the Kruskal-Wallis test and Mann-Whitney U test using the closed testing approach (significance level for familywise error rate, α=.05).
Results
None of the acrylic and composite resin materials tested in this study demonstrated the 3-body wear resistance of ceramic teeth or human enamel. Teeth with inorganic fillers demonstrated significantly lower wear values than conventional or cross-linked acrylic resin teeth without fillers. Composite resin teeth with traditional fillers showed significantly lower wear than composite resin teeth with nanofillers.
Conclusions
Denture teeth with and without inorganic fillers differed significantly with regard to the degree of wear generated in the ACTA wear simulator. The incorporation of nanofillers did not improve the wear resistance compared to teeth with traditional fillers.
aAssistant Professor, Department of Prosthodontics, Heidelberg University Hospital, Heidelberg, Germany
bFormer Resident, Department of Prosthodontics, Heidelberg University Hospital, Heidelberg, Germany
cAssistant Professor, Department of Prosthodontics, Heidelberg University Hospital, Heidelberg, Germany
dAssistant Professor, Institute of Medical Biometry and Informatics, Heidelberg University Hospital, Heidelberg, Germany
eDirector, Department of Prosthodontics, Heidelberg University Hospital, Heidelberg, Germany
Corresponding author: Dr Thomas Stober, Heidelberg University Hospital, Department of Prosthodontics, Im Neuenheimer Feld 400, D-69120 Heidelberg, GERMANY, Fax: 06-221-565371
Financially supported by Heraeus Kulzer GmbH, Hanau, Germany.
ABSTRACT