Abstract
To study the wettability of porcelain to porcelain-fused-to-metal (PFM) alloys, an apparatus equipped with a CCD camera and a personal computer was made for measurements of the contact angle. In experiment I, the performance of the apparatus was tested using an opaque porcelain and PFM alloys on the market. Compared to the usual photographic method for measurements, no significant differences in the values of the contact angle were observed. In experiment II, the contact angles and works of adhesion between the porcelain and ten experimental PFM alloys which were prepared by adding 0, 2, 4 and 6 wt% Ti, Sn, or Mo to an 80 wt% Ni-20 wt% Cr master alloy were determined using the appartus that had been improved based on experiment I. As a result, the work of adhesion (x) correlated highly significantly with the corresponding previously reported pull-through shear bond strength (y), and the regression line was y (kgf/cm2)=-21.4+0.4136x (erg/cm2).
