Polymerization shrinkage strain of interocclusal recording materials.

Abstract

OBJECTIVES:

The aim of this in vitro study was to investigate the polymerization shrinkage behavior and to measure the polymerization shrinkage-strain of interocclusal recording materials.

METHODS:

The materials investigated in this study were five polyvinylsiloxane (Imprint Bite, Silagum Automix Bite, O-Bite, Blu-Mousse Classic and Exabite II), one polyether (Ramitec) and one dimethacrylatebased (Luxabite) materials. The polymerization shrinkage values of ten specimens for each material were measured by the Bonded-disk method at 1, 3, 5, 7 and 10 min after mixing at 37 degrees C. The amount of shrinkage-strain (%) was derived and all data were statistically analyzed by one-way ANOVA and the multiple comparison Scheffé test (alpha=0.05).

RESULTS:

The representative shrinkage-strain kinetic graphs showed that all specimens shrank immediately, except Luxabite which expanded for the initial few seconds. After that, the shrinkage-strain values increased in the magnitude up to 10 min, but its rate decreased gradually with time. The shrinkage-strain values (0.18+/-0.03-0.16+/-0.03%) of O-Bite at 5, 7 and 10 min were significantly lower than the other materials, but Luxabite exhibited the highest values (3.10+/-0.17-3.30+/-0.16%).

SIGNIFICANCE:

The interocclusal recording materials investigated presented significantly different polymerization shrinkage-strain kinetics and showed dimensional changes even after the setting time indicated by respective manufacturers.

• Authors: Jung-hyun Chun, Ahran Pae, Sung-hun Kim
• Journal: Dental materials : official publication of the Academy of Dental Materials (Dent Mater) Vol. 25 Issue 1 Pg. 115-20 (Jan 2009) ISSN: 1879-0097 [Electronic] England
• PMID: 18614226 (Publication Type: Journal Article)

Chemical References

• Dental Impression Materials
• Imprint II
• Methacrylates
• Polymers
• Polyvinyls
• Siloxanes
• vinyl polysiloxane
• Ramitec

Topics

• Dental Impression Materials (chemistry)
• Humans
• Jaw Relation Record (instrumentation)
• Materials Testing
• Methacrylates (chemistry)
• Polymers (chemistry)
• Polyvinyls (chemistry)
• Siloxanes (chemistry)
• Stress, Mechanical
• Surface Properties
• Time Factors