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An investigation was conducted to evaluate the accuracy of one-piece castings of FPDs consisting of three, four, and five units with a ceramometal alloy cast in a large circular ring. A three-piece aluminum mold with stainless steel dies simulating the various lengths of the FPDs was used. A total of 18 castings, six castings for each FPD, were fabricated. Marginal discrepancies of the castings on the dies and the length of the castings were compared before and after sectioning the castings at the connectors. The following conclusions were drawn from the study. Seating of the castings improved approximately 50% after sectioning, which indicates that the castings were distorted. The distortion was a three-dimensional phenomenon, with the greatest discrepancy on the mesiogingival surface of the anterior retainer and on the distolingual surface of the posterior retainer. The distortion was least for the three-unit FPDs and greatest for the five-unit FPDs. The lingual-facial diameter of the castings at the gingival axial line angle was significantly larger than the dies in most cases. The mesiodistal diameter of the castings at the gingival axial line angle was smaller than that of the dies but was only significant with the three-unit FPDs. Although the castings were slightly oversized or undersized, the primary reason the castings did not seat was warpage.
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G J Ziebert, and
V B Dhuru, and
W A Brantley, and
K Sigaroudi
January 2001,
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B E Schiffleger, and
G J Ziebert, and
V B Dhuru, and
W A Brantley, and
K Sigaroudi
March 1993,
Hua xi yi ke da xue xue bao = Journal of West China University of Medical Sciences = Huaxi yike daxue xuebao,
B E Schiffleger, and
G J Ziebert, and
V B Dhuru, and
W A Brantley, and
K Sigaroudi
August 1968,
Dental survey,
B E Schiffleger, and
G J Ziebert, and
V B Dhuru, and
W A Brantley, and
K Sigaroudi
April 1977,
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B E Schiffleger, and
G J Ziebert, and
V B Dhuru, and
W A Brantley, and
K Sigaroudi
April 1995,
Quintessence international (Berlin, Germany : 1985),
B E Schiffleger, and
G J Ziebert, and
V B Dhuru, and
W A Brantley, and
K Sigaroudi
January 1992,
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B E Schiffleger, and
G J Ziebert, and
V B Dhuru, and
W A Brantley, and
K Sigaroudi
November 1991,
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B E Schiffleger, and
G J Ziebert, and
V B Dhuru, and
W A Brantley, and
K Sigaroudi
January 1966,
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B E Schiffleger, and
G J Ziebert, and
V B Dhuru, and
W A Brantley, and
K Sigaroudi
June 1983,
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B E Schiffleger, and
G J Ziebert, and
V B Dhuru, and
W A Brantley, and
K Sigaroudi
June 1970,
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