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Dental Research Journal، جلد ۱۰، شماره ۳، صفحات ۰-۰
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عنوان انگلیسی Effect of acid pre‑conditioning and/or delayed light irradiation on enamel bond strength of three resin‑modified glass ionomers
چکیده انگلیسی مقاله Background: Polymerization of resin‑modified glass‑ionomers (RMGIs) is mediated through two competing mechanisms: An acid‑base reaction and a light‑dependent resin polymerization. Furthermore, pre‑conditioning with acid has resulted in an increase in enamel bond strength of some RMGIs. This in vitro study evaluated the effect of pre‑conditioning and/or delayed irradiation on bond strength of three RMGIs to enamel. Materials and Methods: In this in vitro study, 144 flat enamel surfaces of human molars were ground using consecutively finer abrasives up to 600‑grit silicon carbide paper. Each surface was rinsed and gently air‑dried ( n = 12). The RMGIs (Fuji II LC Improved; Ionolux and Vitremer) were bonded to enamel surfaces using the following protocols: Groups 1: Based on manufacturers’ instructions; Groups 2: Pre‑conditioning with phosphoric acid for 30 s; groups 3: A 2‑min delay in irradiation; groups 4: Pre‑conditioning with acid for 30 s plus a 2‑min delay in light activation. After 24‑h storage at 37°C and 500 rounds of thermocycling, the samples underwent shear bond strength (SBS) test. Data was analyzed with 3‑way ANOVA and Tukey HSD test (α =0.05). Results: There were significant differences between the study groups ( P < 0.001). Acid‑pre‑conditioning increased Fuji II LC SBS values; it significantly decreased SBS values of Vitremer but had no effect on SBS values of Ionolux. Ionolux and Vitremer exhibited decreased enamel bond strength after a delay in light activation ( P < 0.05). A 2‑min delay in light activation combined with acid pre‑conditioning increased RMGI SBS values only for Fuji II LC. Conclusion: Within the limitations of the present study, the effect of acid pre‑conditioning, delaying irradiation and both on enamel bond strength of RMGIs was material‑dependent. Further investigations are recommended. Key Words: Acid pre‑conditioning, bond strength, delayed irradiation, enamel, resin‑modified glass‑ionomer
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نویسندگان مقاله مریم خروشی | maryam khoroushi


معین حسینی شیرازی | moeen hosseini shirazi


حجت اله سلیمانی | hojatolah soleimani


نشانی اینترنتی http://drj.mui.ac.ir/index.php/drj/article/view/1443
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زبان مقاله منتشر شده en
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نوع مقاله منتشر شده Original Article(s)
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