In vitro assessment of dental materials used in cervical cavities
Abunijem, Ruba Z.
MetadataShow full item record
Purpose: (1) Compare resin composite and glass ionomer restorations when placed on cervical lesions of extracted bovine teeth in terms of marginal discoloration and marginal adaptation after in vitro accelerated aging process. (2) Compare the color stability after accelerated aging process and storage in a staining solution. Materials and Methods: class V cavities (n= 60) were prepared on bovine teeth and filled with Fuji IX GP Extra (Glass Ionomer), ChemFil ® Rock (Reinforced Glass Ionomer) or IPS Empress Direct (Resin). Marginal adaptation was scored according to modified USPHS criteria after 5000 cycles of thermocycling. Marginal discoloration was scored after immersing in coffee solution for two days. Fifteen discs from each material were fabricated and randomly assigned to three groups: water storage, thermocycling or coffee staining for evaluation of color stability. Spectrophotometer was used to evaluate the color changes at baseline and 2 weeks after staining. Results: IPS Empress Direct and Fuji IX Extra had similar adaptation and discoloration while ChemFil Rock had more detectable V-shaped defects in enamel and more staining detected along the margins. The color differences were analyzed by two way ANOVA and Tukey's test (p< 0.05). There was a significant interaction between staining solution and material (p < 0.05). Fuji IX and ChemFil Rock both showed significant color change after immersion in coffee, however this change was significantly greater for coffee than for either water storage or thermocycling for both materials. There were no significant color changes for IPS Empress Direct. All three materials had greater color change for coffee than for water storage or thermocycling. Conclusion: IPS Empress Direct had superior marginal adaptation, color stability and minimal discoloration in comparison Fuji IX Extra and ChemFil Rock. Fuji IX Extra exhibited good marginal adaptation and minimal marginal discoloration. However, it had the least color stability. ChemFil Rock showed inferior marginal adaptation, a high degree of discoloration and low color stability. All tested materials in this study were affected by coffee staining. However, IPS Empress Direct was the least affected and within the limits of this study, it should be the first choice in esthetic restorations among materials tested.