[Wear behavior of enamel and veneering ceramics].
OBJECTIVE
To compare the wear between the enamel and two types of dental decoration porcelains for all-ceramic restorations (Vita-alpha, Vintage AL).


METHODS
Friction coefficients, wear scar width, element concentrations and wear surface evolution were considered relatively to the tribology of that in vivo situation. The wear scars of the samples were characterized by means of dynamic atomic force microscopy (DFM). The different element concentrations of the surface before/after the wear test were determined with energy dispersion spectrometry (EDS).


RESULTS
The friction coefficient varied from time in each kind of material. The statistical differences between materials were observed in wear scar width and properties of materials (P<0.05). DFM results showed wear surface of natural tooth full of abrasive particles and denaturation of dental texture. Wear surface of veneering ceramics consisted mainly of abrasive particles, plough and microcracking. EDS results showed that the element concentration of Fe was obviously found on the samples after wear.


CONCLUSIONS
The main underlying mechanisms of natural teeth wear are abrasive, and denaturation of dental texture. Abrasive wear, adhesion and fatigue of veneering ceramics characterize the wear patterns which plays different role in Vita-alpha and Vintage AL. The wear patterns of veneering ceramics can be described as mild wear.
Gao
Qing-ping
QP
Department of Prosthodontics, Xiangya Hospital, Central South University, Changsha 410008, China.
Chao
Yong-lie
YL
Jian
Xin-chun
XC
Guo
Feng
F
Meng
Yu-kun
YK
D002516:Ceramics; D003743:Dental Enamel; D003776:Dental Porcelain; D019554:Dental Restoration Wear; D008422:Materials Testing; D013499:Surface Properties; D019217:Tooth Attrition
C472245:Vita Alpha; D003776:Dental Porcelain