Proprietary ion glass technology: Riva Silver utilizes SDI's proprietary ion glass filler developed by our glass technologists. ion glass is a radiopaque, high ion releasing, reactive glass used in SDI's range of dental cements. Riva Silver releases substantially higher fluoride to assist with remineralisation of the natural dentition. Light color: The light grey color of Riva Silver requires minimal masking when used under aesthetic restorations.