Water Sorption, Solubility, and Color Stability of Giomer Restoratives

Abstract

The high levels of water sorption and discoloration of giomer composites are likely to have an adverse effect on esthetic restorations.

In Vitro Assessment of Water Sorption, Solubility and Surface Roughness of Compomer and Giomer Materials After Immersion in Different Beverages

“…Release of fluoride from any restorative material is mediated by its capability for water diffusion. However, excessive absorption of large amounts of water may cause chemical degradation of the material, debonding of the matrix and release of residual monomers (12,33) .…”

“…Some studies calculate water sorption by subtracting the conditioned-initialdry mass prior to immersion from the saturated mass of specimen after immersion. However, this method does not take into consideration the amount amount of leached out materials (9)(10)(11)(12) . Therefore, to be more precise, in this study, the water sorption was calculated by subtracting the reconditioned-finaldry mass from the saturated mass of specimen after immersion (3,4,(15)(16)(17)(18)(27)(28)(29) .…”

“…The light tip was kept in direct contact with the matrix strip. After specimens were removed from the mold, any excess material was removed by a sharp scalpel blade (# 15) to avoid loose particles attached to the specimens during weighing or immersion (4,12,15,16,26) .…”

“…The PRG fillers are fabricated by acid-base reactions between fluoride containing glass and polyacrylic acid in the presence of water. Yet, giomers still have the need to absorb water to maintain fluoride release and recharge properties of glass-ionomer cements (1,6,(10)(11)(12)(13) .…”

Recent Approaches In Restorative Glass Ionomer Cements

“…65 Bu materyalin uzun dönemli flor salınımını inceleyen bir in-vitro çalışmada, ilk birkaç günde flor salınımının çok az olduğu, ancak 21 gün sonunda flor salınımının anlamlı derecede arttığı görülmüştür. 66 69 İki farklı giomerin kullanıldığı Sınıf I ve V kavitelerde iki yıllık klinik değerlendirmeye göre, materyaller Sınıf V kavitelerde %80 ve %71 başarı gösterirken, oklüzal kavitelerdeki başarı oranı %100 olmuştur. 70 Sekiz yıllık takipli bir çalışmada, restorasyonlarının hiç birinin başarısız olmadığı ve Sınıf I ve II restorasyonların klinik düzeyde kabul edilebilir olduğu bildirilmiştir.…”