[The influence of the try-in pastes on the colour of all-ceramic veneers].
OBJECTIVE
To study the influence of the try-in pastes on the color of all-ceramic veneers made by Ips-empress II system.


METHODS
50 discolored teeth were collected and restored with all-ceramic veneers. Five try-in pastes including A1, A3, transleucent(Trt), white opaque(WOT) and B0.5 opaque(B0.5),which were different in shade, were respectively used to try in before cementing. The color was measured by the ShadeEye, a digital colorimeter, and expressed in terms of 3 coordinate values (L*,a*,b*) of the CIEL*a*b* system. Then the color differences(deltaEa*b*) of all-ceramic veneers[deltaEa*b*=(deltaL*(2)+deltaa*(2)+deltab*(2))(1/2)] as well as the value of L*deltaC(ab)[C(ab)=(a*(2)+b*(2))(1/2)] and H(ab)[H(ab)=arctan(b*/a*)]were calculated. Meanwhile,the thickness of the measurement point was measured and recorded. One-way ANOVA was used to analyze deltaEa*b* as well as L*,C(ab) and Hab.


RESULTS
The average thickness of the ceramic was 1.088mm, and the colour of the veneers after try in with WOT paste and B0.5 paste performed a higher L* value than the other pastes (P<0.05).And the veneers also showed a higher C(ab) value after try in with WOT,B0.5 and A3 paste than the A1 and Trt paste (P<0.05). No significant differences were found in Hab value after these 50 veneers tried in with these five kinds of pastes.


CONCLUSIONS
It's more advisable to choose the WOT or the B0.5 luting agent to cement the veneer when the abutment tooth is severely discolored, while the Trt or the A1 shade and A3 shade luting resin may be more appropriate if the abutment tooth doesn't discolor or a little compared with the adjacent tooth.
Zhang
Xiu-yin
XY
Department of Prosthodontics, College of Stomatology, Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China. xyinzhang@yahoo.com.cn
Qian
Hai-xin
HX
Yang
Dan-ling
DL
Gan
Hong
H
Min
Ming
M
Yu
Wei-qiang
WQ
D002516:Ceramics; D003116:Color; D003124:Colorimetry; D003738:Dental Cements; D003776:Dental Porcelain; D003801:Dental Veneers; D006801:Humans; D009824:Ointments
D003738:Dental Cements; D009824:Ointments; D003776:Dental Porcelain