Color and translucency of finished and unfinished esthetic restorative materials after staining and bleaching.

To evaluate the effect of staining and bleaching on color and translucency of finished and unfinished nano-filled resin composite and giomer. Twenty specimens (ten finished + ten unfinished) were fabricated from each material, then an initial color and translucency measurement was taken. Specimens were stained in coffee for 48 h at 37 °C, rinsed and dried.

A comparative study on fluoride release and water sorption of different flowable esthetic restorative materials.

Objectives: The objective of the study was to evaluate fluoride release and water sorption of three flowable esthetic restorative materials: a giomer, a fluoride-releasing resin composite, and a nonfluoridated resin composite.

Materials And Methods: Ten samples from a giomer, a fluoride releasing nano-hybrid, and a nonfluoridated nano-hybrid composite were prepared and immersed in deionized water. Fluoride measurements were done using an ion-specific electrode attached to a microprocessor-based fluoride meter after 1 day, 1 week, and 4 weeks.

Chemical and mechanical degradation of nano-ionomer after two different surface protections: An in vitro study.

Purpose: To evaluate the effect of food-simulating liquids prior to brushing on surface roughness of a nano-ionomer restorative protected with two surface protection agents.

Methods: 90 specimens were divided into three groups according to surface protection; the first group: no surface protection; the second group: copal varnish; the third group: light cure Ketac Glaze. Each group was subdivided into three subgroups relative to the immersion solution: artificial saliva; citric acid 0.