Two- and three-body wear of composite resins.
OBJECTIVE
The aim of the present study was to investigate two- and three-body wear of microfilled, micro-hybrid and nano-hybrid composite resins using a ball-on-disc sliding device.


METHODS
One microfilled (Durafill VS), one micro-hybrid (Filtek Z250), one hybrid (Clearfil AP-X), one nanofilled (Filtek Supreme XT), and two nano-hybrid (MI Flow, Venus Diamond) composite resins were examined. The composites were filled in a cylindrical cavity, and light polymerized. After storage in 37°C distilled water for 7days, all specimens were tested with a custom-made ball-on-disc sliding device with a zirconia ball as antagonist (50N loads, 1.2Hz, 10,000 cycles) immersed in water, poppy seed slurry and polymethyl methacrylate slurry, respectively. Maximum wear depth and volume loss of worn surfaces were quantified by a digital CCD microscope and analyzed with two-way analysis of variance.


RESULTS
The interactions between composite resin and condition of their maximum wear depth and volume loss were significant (p<0.01). The abrasive wear produced at three-body loading with poppy seed slurry was very large for the microfilled composite, and small for all other composites tested. In contrast, two-body wear of the microfilled composite, and one nano-hybrid composite was very low.


CONCLUSIONS
The ball-on-disc sliding device used is considered suitable to simulate sliding of an antagonist cusp on an opposing occlusal composite restoration, either in the two- or the three-body wear mode. All tested materials except for the microfilled composite showed low surface wear when exposed to poppy seed as the third-body medium.
Advanced Biomaterials, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
Natthavoot
N
Koottathape
Hidekazu
H
Takahashi
Naohiko
N
Iwasaki
Masafumi
M
Kanehira
Werner J
WJ
Finger
D003188:Composite Resins / Q000737:chemistry* / Q000145:classification; D003764:Dental Materials / Q000737:chemistry*; D019554:Dental Restoration Wear; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D053761:Nanocomposites / Q000737:chemistry; D010207:Papaver; D058105:Polymerization; D019904:Polymethyl Methacrylate / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D012639:Seeds; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry
C112828:Clearfil AP-X; D003188:Composite Resins; D003764:Dental Materials; C515951:Filtek Supreme Plus; C444701:Filtek Z250; D008689:Methacrylates; D011140:Polyurethanes; C542517:Venus flow composite resin; D014867:Water; C029824:urethane dimethacrylate luting resin; C039734:Durafill; D019904:Polymethyl Methacrylate; D015040:Zirconium; C028541:zirconium oxide