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Distortions in indexing methods and investing media for soldering and remount procedures

Authors
Journal
Journal of Prosthetic Dentistry
0022-3913
Publisher
Elsevier - Mosby
Publication Date
Volume
42
Issue
2
Identifiers
DOI: 10.1016/0022-3913(79)90169-0
Keywords
  • Fixed Prosthodontics • Operative Dentistry
Disciplines
  • Computer Science

Abstract

Abstract A three-dimensional distortion analysis was made of seven indexing-investment systems and six indexing-remount systems. Measurements were made to within ±0.005 mm with a Nikon Profile Projector and a linear variable differential transformer (LVDT); distortions (linear and rotational) were calculated by means of a PDP 11/40 computer system. Mean vector displacements, Δ X 2 + Δ Y 2 + Δ Z 2 , were calculated, and a statistical evaluation of the data was completed. The results of the study indicate: 1. The zinc oxide-eugenol (ZOE) indexing-investment system produced a narrower range and a significantly smaller mean distortion than the other six indexing-investment systems. 2. The ZOE-stone remount technique showed significantly less distortion than the ZOE-low-fusing metal or the ZOE-acrylic resin techniques. 3. The polyether-stone remount technique demonstrated significantly less distortion than either the polyether-low-fusing metal or the polyether-acrylic resin system. 4. The polyether-stone remount system was not significantly different from the ZOE-low-fusing metal system. 5. The ZOE-stone remount technique demonstrated a smaller range of distortions, but those distortions were not significantly different from those of the polyether-stone remount technique.

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