Visualization study on distortion of a metal frame by polymerization shrinkage and thermal contraction of resin.
Three types of metal specimens (ring-shaped, plate-shaped, and a simulated anterior arch) for distortion observations were made from Au-Ag-Pd-Cu alloy. Distortion due to polymerization shrinkage and thermal contraction of a heat-curing acrylic resin containing 4-META (4-methacryloyloxyethyl trimellitate anhydride, 4-META resin) could be visualized for the ring-shaped specimen, which showed increasing distortion of the metal frame upon adhesion of the resin to the outer metal surface. Distortion of the plateshaped specimen adhering to 4-META resin decreased with increasing thickness of the cured resin. The distortion of the metal frame simulating an anterior arch of a six-unit bridge with a facing composite resin showed that the curvature of the metal frame was larger after curing of the facing composite resin. However, it recovered most of its original curvature with an associated increase in the number of cracks between the crowns after trimming the resin to a tooth profile.
Division of Biomaterials and Bioengineering, Department of Oral Rehabilitation, School of Dentistry, Health Sciences University of Hokkaido.
Ken
K
Kakino
Kazuhiko
K
Endo
Masanori
M
Hashimoto
Kunihiko
K
Furuta
Hiroki
H
Ohno
D000180:Acrylic Resins / Q000737:chemistry*; D000497:Alloys / Q000737:chemistry*; D003300:Copper / Q000737:chemistry; D006046:Gold / Q000737:chemistry; D006358:Hot Temperature; D007854:Lead / Q000737:chemistry; D008422:Materials Testing; D008689:Methacrylates; D058105:Polymerization; D012834:Silver / Q000737:chemistry; D013499:Surface Properties
D000180:Acrylic Resins; D000497:Alloys; D008689:Methacrylates; D007854:Lead; D012834:Silver; C034139:4-methacryloxyethyltrimellitic acid anhydride; D006046:Gold; D003300:Copper