[Influence of manufacture technique on translucency and color of dental porcelain].
OBJECTIVE
To study the influence of manufacture technique on the translucency and color of dental porcelain.


METHODS
Specimens were made of VITA VMK 95 dentin porcelain and enamel porcelain and divided into 3 groups: Sintering times group (1, 2, 4, 6, 8 and 10 times), sintering temperature group (910, 920, 930, 940 and 950 degrees C), sintering vacuum group (95, 65, 35 and 0 kPa). Transmittance, Y, dominant wavelength and saturation were measured by PR-650 spectra scan spectrocolorimeter.


RESULTS
Transmittance of dentin porcelain increased after 6 times repeated sintering. Transmittance of enamel porcelain increased first after the second sintering, and then became decreasing when sintering more than 2 times. Transmittance of enamel porcelain deceased when sintering temperature was lower than standard. Decrease of sintering vacuum caused the transmittance of dentin and enamel porcelain decreased. The changing of value was coordinated with transmittance. Dominant wavelength and saturation had negative correlation with sintering times and temperature, and positive correlation with vacuum.


CONCLUSIONS
Sintering times, temperature and vacuum all had prominent effects on the translucency and color of dental porcelain. Comparing with dentin porcelain, enamel porcelain was more sensitive with the modification of manufacture technique.
Xiong
Fang
F
Dept of Dental Technology, West China College of Stomatology, Sichuan University, Chengdu 610041, China.
Chao
Yong-Lie
YL
Zhu
Zhi-Min
ZM
D003116:Color; D003722:Dental Alloys; D003743:Dental Enamel; D003776:Dental Porcelain; D003804:Dentin; D006801:Humans; D013696:Temperature
D003722:Dental Alloys; D003776:Dental Porcelain; C047040:Vita VMK 68