The fit of fixed partial dentures joined by infrared soldering.
This study determined the accuracy of fit of three-unit fixed partial dentures joined by an infrared soldering technique compared with one-piece fixed partial denture castings and individually cast crowns. Wax patterns of prepared Ivorine teeth, maxillary left central incisor and maxillary left canine, were injection molded; a plastic rod was used as a pontic. One group of patterns was cast as one-piece dentures; the other group was sectioned in the connector area, cast individually and then joined by infrared soldering. Castings were seated on their respective dies, embedded in epoxy resin, and sectioned. Gap distances between the casting and the die were measured at specified marginal sites with a profile projector. Results showed that the fit of infrared-soldered fixed partial dentures was significantly better than that of one-piece castings and was comparable with the fit of single crowns. The gap openings measured in all castings were within the range of clinical acceptability.
Department of Fixed Prosthodontics, Loyola University of Chicago, School of Dentistry, Ill.
G
G
Byrne
L W
LW
Laub
J Y
JY
Hu
M F
MF
Land
D003442:Crowns; D003481:Cuspid; D003735:Dental Casting Technique; D003737:Dental Cavity Preparation; D003775:Dental Polishing; D012994:Dental Soldering / Q000379:methods*; D003779:Denture Design; D003830:Denture, Partial, Fixed; D006801:Humans; D007180:Incisor; D007259:Infrared Rays; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties