Three-body wear of resin denture teeth with and without nanofillers.
BACKGROUND
The wear behavior of newly developed denture teeth with nanofillers may be different from teeth with other chemical formulations.


OBJECTIVE
The purpose of this study was to examine the 3-body wear resistance of 11 different commercially available resin denture teeth.


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, alpha=.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.
Department of Prosthodontics, Heidelberg University Hospital, Heidelberg, Germany. thomas_stober@med.uni-heidelberg.de <thomas_stober@med.uni-heidelberg.de>
Thomas
T
Stober
Moritz
M
Henninger
Marc
M
Schmitter
Maria
M
Pritsch
Peter
P
Rammelsberg
D000180:Acrylic Resins / Q000737:chemistry; D000538:Aluminum Silicates / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D003743:Dental Enamel / Q000648:ultrastructure; D003764:Dental Materials / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry; D019554:Dental Restoration Wear; D003799:Dental Stress Analysis / Q000295:instrumentation; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D049329:Nanostructures / Q000737:chemistry*; D019904:Polymethyl Methacrylate / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D017680:Potassium Compounds / Q000737:chemistry; D013499:Surface Properties; D014093:Tooth, Artificial
D000180:Acrylic Resins; D000538:Aluminum Silicates; D003188:Composite Resins; D003764:Dental Materials; D008689:Methacrylates; D011140:Polyurethanes; D017680:Potassium Compounds; D003776:Dental Porcelain; C016447:feldspar; C029824:urethane dimethacrylate luting resin; D019904:Polymethyl Methacrylate