• Cement
• /
• s.175
• /
• pp.74-76
• /
• 2007

• Cement
• /
• s.175
• /
• pp.77-88
• /
• 2007

• Cement
• /
• s.174
• /
• pp.34-41
• /
• 2007

• Cement
• /
• s.174
• /
• pp.65-67
• /
• 2007

• Cement
• /
• s.174
• /
• pp.68-73
• /
• 2007

• Cement
• /
• s.174
• /
• pp.74-80
• /
• 2007

• Cement
• /
• s.174
• /
• pp.81-92
• /
• 2007

• Restorative Dentistry and Endodontics
• /
• v.18 no.2
• /
• pp.507-513
• /
• 1993

The purpose of this study was to observe the effect of immersion in water at 3, 5, 7, and 10 minutes after mixing on the surface of three regular and one light-curing glass-ionomer cement by measuring penetration of a methylene blue solution. Early solubility of these cements was also measured and compared with that of a zinc phosphate and a polycarboxylate cement. A blue-stained zone was observed in all glass-ionomer cement, but an inner, opaque zone was observed in only two of the regular glass-ionomer cements. Extending the time between start of mixing and immersion on water decreased the width of both zones in all cements and markedly lowered the loss of substance from the surface of regular glass-ionomer cements. However, time after mixing had no or only a limited effect on the loss of substance from the light-curing glass-ionomer cement, the zine phosphate cement, or the polycarboxylate cement.

• Proceedings of the KOSOMBE Conference
• /
• v.1996 no.11
• /
• pp.337-346
• /
• 1996

Debonding of cement-femoral stem interface has been suggested as a initial focus of loosening mechanism in many previous studies of cemented total hip replacement. The purpose of this study was to investigate the effect of debonding of cement-femoral stem interface to the bone-cement interface by using three-dimensional non-liner finite element analysis. Three cases of partial debonded, full debonded, full bonded cement-bone interface were modelled with partial bonding of distal 70mm from the tip of femoral stem. Each situation was studied under loading stimulating one-leg stanced gait of 68kg patient. The results showed that under partial and full debonded cement-stem interface condition the peak von Mises stress(3.1 MPa) were observed at the cement of bone-cement interface just under the calcar of proximal medial of femur, and sudden high peak stresses(3.5MPa) were developed at the distal tip of femoral stem at the lateral bone-cement interface in all 3 cases of bonding. The stresses were transfered very little to the cement of upper lateral bone-cement interface in partial and full debonded cases. Thus, once partial or full debonded cement-femoral stem interface occured, 3 times higher stress concentration were developed on the cement of proximal medial bone-cement interface than full bonded interface, and these could cause loosening of cemented total hip replacement. Clinically, preservation of more rigid cement-femoral stem interface may be important factor to prevent loosening of femoral stem.

• Cement Symposium
• /
• no.1
• /
• pp.56-63
• /
• 1973

In cement industry in which three or more raw materials are used, the proportioning of raw materials is an essential step. When the materials are proportioned, each should be as nearly homogeneous chemically and physically as conditions permit. Most of th