Abstract
We evaluated the effect of water storage on fluoride release and mechanical properties of compomer restorative material. Fluoride release was recorded using a specific fluoride electrode. Flexural properties and fracture tough-ness were measured using a universal testing machine. Vickers hardness was measured using a micro-hardness tester. There was initial burst of fluoride release up to 1 w, which was diminished to a low level in 1 mon and remained relatively constant over 6 mon. Flexural strength and hardness were increased up to 1 mon followed by a gradual decrease up to 6 mon. Flexural modulus was decreased gradually up to 6 mon. Fracture toughness was increased during the first week and gradually decreased over the storage period. We concluded that flexural prop-erties, fracture toughness, Vickers hardness and fluoride release of compomer were sensitive to water as well as storage time. There was a significant effect of fluoride release on the studied mechanical properties.
Highlights
Polyacid-modified composite resin restorative materials were introduced as a new class of dental materials to overcome the problems associated with conventional glass ionomers and composite resins[1]
Each 4 mL storage water and the 1 mL used for washing were mixed with 4 mL total ionic strength adjustable buffer (TISAB) solution and analyzed for fluoride ions with the use of an ion-specific electrode (Orion Electrode, Orion Research Inc., Boston, MA, USA) connected to an ion analyzer supplied with the measuring unit
There were a significant decrease in the amount of fluoride release between 24 h and 1, 2, 3, 6 mon of water storage (Table 1)
Summary
Polyacid-modified composite resin (compomer) restorative materials were introduced as a new class of dental materials to overcome the problems associated with conventional glass ionomers and composite resins[1]. Compomers set via light-activated addition polymerization followed by an acid-base reaction that arises from the adsorption of water in the oral cavity[2,3]. These materials are recommended for cervical lesions, class III and V restorations in adults as well as class I and II restorations in children[3]. It was reported that compomers have superior mechanical properties compared with conventional glass ionomers[6]. They release fluoride by a mechanism similar to that of conventional and hybrid glass ionomers. Since compomers have lower amount of glass ionomer material in their formulation, the amount of fluoride and its duration are lower than that of glass and hybrid ionomers[8,9,10]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
