Setting shrinkage and hygroscopic expansion of resin-modified glass-ionomer in experimental cylindrical cavities.
The effects of the C-value (bonded surface area/unbonded surface area) and the volume of the cavity on the volumetric dimensional changes [volumetric setting shrinkage (VSS) and volumetric hygroscopic expansion (VHE)] of a resin-modified glass-ionomer (RMGI) filled in experimental cylindrical cavities were evaluated. The VSS and the VHE rate decreased with increasing C-value. There was a high inverse regression between the cavity C-value and volumetric dimensional changes, but a low regression between cavity volume and volumetric dimensional changes. Therefore, it was thought that greater contraction stress would remain in high C-value cavities than low C-value cavities during the setting process. It was also confirmed that the volumetric dimensional changes of RMGI in cavity were influenced primarily by the cavity C-value.
Kim
Y G
YG
Department of Dental Engineering, Tsurumi University School of Dental Medicine, Yokohama, Japan.
Hirano
S
S
D000042:Absorption; D000818:Animals; D002417:Cattle; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D001840:Dental Bonding; D003737:Dental Cavity Preparation; D018772:Dental Marginal Adaptation; D005899:Glass Ionomer Cements / Q000737:chemistry*; D008422:Materials Testing; D011108:Polymers / Q000737:chemistry; D012117:Resins, Synthetic / Q000737:chemistry*; D014867:Water / Q000737:chemistry
C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; D011108:Polymers; D012117:Resins, Synthetic; D014867:Water