TY - JOUR
T1 - Proportioning effect on physical and chemical properties of polysulfide impression material
AU - Rueggeberg, Frederick A.
AU - Paschal, Shavon
N1 - Funding Information:
Polysulfide impression materials are dispensed today as they were when they were first introduced to the profession. Two pastes are contained in a kit and the clinician is instructed to extrude, by estimation, equal amounts of each paste on a mixing pad.6 After the pastes are dispensed, a spatula is used to create a homogeneous mixture of the components before they are loaded into a custom-made acrylic impression tray. Addition silicone materials, which compete with polysulfide, are now available in cartridge systems that are automatically dispensed in equal amounts of the two paste components and mixed through an auger device, eliminating the need for manual proportioning and mixing.4 Such a dispensing and mixing system is not pos- Supported in part by National Institutes of Health Apprentice Program Grant SO3 RR0 3035-13 and NIH/NIDR Grant DE09418. aAssociate Professor, Dental Physical Sciences. bMHSSRAP Trainee. Copyright @ 1994 by The Editorial Council of THE JOURNAL OF PROSTHETIC DENTISTRY.
PY - 1994/10
Y1 - 1994/10
N2 - This study investigated the effect of variation in proportioning polysulfide base and catalyst. Light, regular, and heavy-bodied pastes were mixed in linear equivalents of base-to-catalyst proportions of 30 70, 40 60, 50 50, 60 40, and 70 30. Compression set, strain in compression, and consistency tests conformed to the American Dental Association (ADA) Specification 19 guidelines. The amount of solvent-leachable components and differences in the cross-linked nature of the cured products were studied. Compression set and strain in compression tests met the ADA specification guidelines. Some consistency values fell outside of the ADA specification limits. The leachable content increased with increasing proportions of catalyst, but polymer cross-linking was remarkably similar for all bodied materials tested. Clinicians need not fear a significant property alteration in polysulfide impression material by the differences (within ±20% of the manufacturer's suggested lengths) in proportioning the component pastes with "eyeball" estimation as directed in the instructions.
AB - This study investigated the effect of variation in proportioning polysulfide base and catalyst. Light, regular, and heavy-bodied pastes were mixed in linear equivalents of base-to-catalyst proportions of 30 70, 40 60, 50 50, 60 40, and 70 30. Compression set, strain in compression, and consistency tests conformed to the American Dental Association (ADA) Specification 19 guidelines. The amount of solvent-leachable components and differences in the cross-linked nature of the cured products were studied. Compression set and strain in compression tests met the ADA specification guidelines. Some consistency values fell outside of the ADA specification limits. The leachable content increased with increasing proportions of catalyst, but polymer cross-linking was remarkably similar for all bodied materials tested. Clinicians need not fear a significant property alteration in polysulfide impression material by the differences (within ±20% of the manufacturer's suggested lengths) in proportioning the component pastes with "eyeball" estimation as directed in the instructions.
UR - http://www.scopus.com/inward/record.url?scp=0028523645&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0028523645&partnerID=8YFLogxK
U2 - 10.1016/0022-3913(94)90561-4
DO - 10.1016/0022-3913(94)90561-4
M3 - Article
C2 - 7990047
AN - SCOPUS:0028523645
SN - 0022-3913
VL - 72
SP - 406
EP - 413
JO - The Journal of Prosthetic Dentistry
JF - The Journal of Prosthetic Dentistry
IS - 4
ER -