The seating of one-piece and soldered fixed partial dentures.

This laboratory study compared the seating of one-piece castings with that of soldered fixed partial dentures. Two investments were investigated, five American Dental Association type III and five metal ceramic alloy fixed partial dentures were made by using the conventional indirect technique. The investing and casting protocol was designed to produce an ideal fit of the individual complete crown abutments, not the fixed partial denture. Independent seating of each retainer provided a baseline measurement for complete seating and was compared with fixed partial denture seating. Fixed partial dentures were then sectioned and reassembled by soldering twice, using a low- and high-expansion investment. Statistical evaluation identified significant differences between the metals and the techniques. Marginal discrepancies with one-piece casting and lower (0.6%) thermal-expansion soldering were clinically unacceptable. A clinically acceptable fit was obtained with the higher (1%) thermal-expansion soldering investment.

[1]  J I Nicholls,et al.  Distortions in indexing methods and investing media for soldering and remount procedures. , 1979, The Journal of prosthetic dentistry.

[2]  W. Eames,et al.  Fit of unit-cast fixed partial dentures related to casting ring size and shape. , 1980, The Journal of prosthetic dentistry.

[3]  John S. Huling,et al.  Comparative Distortion in Three-Unit Fixed Prostheses Joined by Laser Welding, Conventional Soldering, or Casting in One Piece , 1977, Journal of dental research.

[4]  J D Preston,et al.  Preceramic and postceramic solder joints. , 1975, The Journal of prosthetic dentistry.

[5]  Timothy J. O'Leary,et al.  HORIZONTAL TOOTH MOBILITY IN CAREFULLY SCREENED SUBJECTS , 1964 .

[6]  J I Nicholls,et al.  Distortion in dental soldering as affected by gap distance. , 1980, The Journal of prosthetic dentistry.

[7]  G J Ziebert,et al.  Comparison of accuracy of multiunit one-piece castings. , 1985, The Journal of prosthetic dentistry.

[8]  E. Parry,et al.  Improving the casting accuracy of fixed partial dentures. , 1985, The Journal of prosthetic dentistry.

[9]  B. J. Winer.  Statistical Principles in Experimental Design , 1992 .

[10]  G J Ziebert,et al.  Accuracy of one-piece castings, preceramic and postceramic soldering. , 1986, The Journal of prosthetic dentistry.

[11]  L I Pazzini,et al.  The accuracy of soldering investment. , 1979, The Journal of prosthetic dentistry.

[12]  Takao Fusayama,et al.  Accuracy of fixed partial dentures made by various soldering techniques and one-piece casting , 1964 .

[13]  K D RUDD,et al.  HORIZONTAL TOOTH MOBILITY IN CAREFULLY SCREENED SUBJECTS. TECHN DOCUM REP SAM-TDR-64-12. , 1964, Technical documentary report. United States. Air Force. Systems Command. Electronic Systems Division.