Effect of Beverages on Some Surface Mechanical Properties and Physical Properties of Two Types of Resin Modified Glass Ionomers

Abstract

Dental erosion is one of the reasons for restoring teeth, various restorative materials may be used in erosion lesions. Since the longevity of these restorations depends on its properties, such as surface roughness, surface hardness, color stability and solubility. The aim of our study was to assess the effect of some beverages on the properties of nano filled RMGI and RMGI restorative materials. This study included for each test, a total of 56 specimens were used, specimens were grouped according to the type of resin modified glass ionomer into Group A: Vitremer (n=28) Group B: Ketac N100 (n=28) Each group was further subdivided into four subgroups according to the storage media used: Group I: artificial saliva (n=7),Group II: coca cola drink (n=7),Group III: orange juice (n=7), Group IV: black coffee (n=7). All specimens were immersed individually in 20 ml of each of the different storage media for 15 min, 3 times (every 8 hours) per day for a month.The storage media were changed 3 times daily and pH were measured. Surface roughness, surface hardness, color stability and solubility values were measured by stylus profiler, vickers hardness tester, spectrophotometer and digital balance respectively at baseline and after 1 month. The statistical analysis of the results showed that the low pH beverages adversely affected the properties of the tested materials. For surface roughness, before the aging process, lower surface roughness values were observed for ketac N100 when compared with vitremer.