Experimental study of the effect on marginal seating of the castings by different investing methods
Ding, W.-s.; Huang, A.-l.; Zhang, Y.-y.; Hu, Y.-j.; Hou, J.-m.
Shanghai Kou Qiang Yi Xue 11(1): 5-6
2002
ISSN/ISBN: 1006-7248 PMID: 14983321 Document Number: 542745
The purpose of this study was to observe the effect on marginal seating of the castings with and without ring investments. Standarded as-cast specimens and round capsules simulated post tooth crowns were made. 12 wax pattern were prepared on the as-cast specimens. The 12 specimens were divided into two groups with 6 wax pattern in each group. Two different investing methods with the same investing material were tested. The marginal seating of the castings was measured under travelling microscope. The marginal seating of the casting without ring investment had significant difference compared with the castings with ring investment (P<0.05). Casting without ring can improve the marginal seating of the castings.