Wear of resin denture teeth by two-body contact.
OBJECTIVE
The objective of this study was to examine the two-body wear resistance of nine different resin denture teeth and one experimental material.


METHODS
The two-body wear test was performed in a chewing simulator with an antagonistic Al(2)O(3) ball under an axial load of 40 N for 100,000 cycles. In each test series, an enamel sample was included as a reference. The wear was determined with an optical 3D surface profilometer. For statistical evaluation, SPSS for Windows was used.


RESULTS
The samples of Artiplus (18.7-SD 21.0) and e-Ha (21.2-SD 15.1) showed the lowest volumetric wear (in mm(3)x10(-3)) after 100,000 cycles. The difference from the other materials tested, except NC Veracia Posterior, was statistically significant (p=0.001-0.037). SR-Postaris-DCL (55.0-SD 6.8), SR-Orthosit-PE (61.1-SD 12.4) and Vitapan (72.1-SD 15.9) exhibited medium-sized wear values with low dispersion, whereas Orthognat (80.1-SD 31.6), Premium 8 (84.6-SD 31.4), NC Veracia Posterior (87.0-SD 52.7), SR-Orthotyp-PE (114.6-SD 28.0) and Trubyte Portrait (123.0-SD 45.6) showed high wear values with great variations. Statistically provable differences were found between SR-Orthotyp-PE and SR-Postaris-DCL (p=0.019) and also between SR-Orthotyp-PE and SR-Orthosit-PE (p=0.031). For enamel, a medium-sized wear value of 66.1-SD 76.8 was determined.


CONCLUSIONS
The denture teeth examined showed differences in two-body wear resistance. The wear values determined were in some cases higher and in others lower than those of natural enamel. A definite connection between the wear resistance and the chemical composition of the materials could not be found in this investigation.
Stober
Thomas
T
Department of Prosthodontics, Ruprecht-Karls-Universität Heidelberg, Poliklinik für Zahnärztliche Prothetik'Im Neuenheimer Field 400, D-69120 Heidelberg, Germany. thomas_stober@med.uni-heidelberg.de
Lutz
Tanja
T
Gilde
Herbert
H
Rammelsberg
Peter
P
D000180:Acrylic Resins / Q000737:chemistry; D000537:Aluminum Oxide / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D003743:Dental Enamel / Q000648:ultrastructure; D003764:Dental Materials / Q000737:chemistry*; D019554:Dental Restoration Wear; D006801:Humans; D021621:Imaging, Three-Dimensional; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D019904:Polymethyl Methacrylate / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D016628:Replica Techniques; D012117:Resins, Synthetic / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties; D014093:Tooth, Artificial
D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D003764:Dental Materials; D008689:Methacrylates; D011108:Polymers; D011140:Polyurethanes; D012117:Resins, Synthetic; C029824:urethane dimethacrylate luting resin; D019904:Polymethyl Methacrylate; D000537:Aluminum Oxide