Dental Materials Journal
Online ISSN : 1881-1361
Print ISSN : 0287-4547
ISSN-L : 0287-4547
Polymerization Shrinkage and Contraction Force of Composite Resin Restorative Inserted with “Megafiller”
Yoshiaki TANIToshiyuki NAMBUAkiko ISHIKAWAShigeru KATSUYAMA
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JOURNAL FREE ACCESS

1993 Volume 12 Issue 2 Pages 182-189,274

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Abstract
This study quantified the contraction force and polymerization shrinkage of composite resins with / without β-Quartz Glass Ceramic Inserts (BQCI) as “Megafiller”. The materials used for the determination included a chemically cured composite and five light-cured composites. The system for measuring contraction force consisted of a transparent teflon tube for preparing the specimen, a small load cell, a dynamic strain guage and a pen-recorder. After the composite was packed into the teflon mold, a BQCI (Type R3) was inserted through the opening and the specimen was cured. Linear polymerization shrinkage of the composites was measured every 10 seconds from the start of mixing or irradiation to 90 minutes by the mercury bath method. Three pieces each of BQCI (Type T3) were inserted in each specimen. The results suggested that BQCI was markedly effective in reducing polymerization shrinkage, but was not always effective in reducing the contraction force during polymerization.
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© The Japanese Society for Dental Materials and Devices
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