Volume 14, Issue 2 (September- 2025)
Caspian J Dent Res 2025, 14(2): 59-66 |
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Ethics code: IR.MUBABOL.REC.1399.358
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Salmani Jelodar M, Aziznejad M, Gholinia H, Khalilpour A, Ezoji F. Micro-Tensile Bond Strength of Conventional and Self-adhering Flowable Composites to Intact and Incipient Caries-Affected Enamel. Caspian J Dent Res 2025; 14 (2) :59-66
URL: http://cjdr.ir/article-1-477-en.html
URL: http://cjdr.ir/article-1-477-en.html
Assistant Professor, Dental Materials Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran. , f.ezoji@mubabol.ac.ir
Abstract: (18 Views)
Introduction: The clinical success of resin composite restorations largely depends on their bond strength to the dental substrate. This study aimed to compare the microtensile bond strength (µTBS) of conventional and self-adhering flowable composites to intact and incipient caries-affected enamel.
Materials & Methods: This in vitro study was conducted on 40 freshly extracted human third molars with sound enamel, free of caries and cracks. Standardized flat enamel surfaces (5 × 6 mm) were prepared on the buccal surfaces using silicon carbide abrasive papers. Artificial incipient caries lesions were induced in 20 specimens, while the remaining teeth served as the sound enamel group. Each group was subdivided into two subgroups (n = 10) according to the type of flowable resin composite used: a self-adhering flowable composite (Vertise Flow; Kerr, USA) and a conventional flowable composite (Filtek Z350; 3M ESPE, USA). Composite buildups with a height of 5 mm were placed on the prepared enamel surfaces following the manufacturers’ instructions. The specimens were sectioned to obtain beam-shaped samples with a cross-sectional area of approximately 1 × 1 mm², and the microtensile bond strength (µTBS) was measured using a universal testing machine. Data were analyzed by two-way ANOVA (alpha=0.05).
Results: The highest μTBS was found in the Z350 Flow composite with intact enamel, while the lowest was observed in Vertise Flow with incipient caries enamel (P˂0.001). In addition, a significant difference in μTBS was found between the two composite groups in both intact and incipient caries enamels (P <0.001).
Conclusion: These findings suggest that conventional flowable composites can provide more reliable bonding performance than self-adhering flowable composites, particularly when bonding to caries-affected enamel.
Materials & Methods: This in vitro study was conducted on 40 freshly extracted human third molars with sound enamel, free of caries and cracks. Standardized flat enamel surfaces (5 × 6 mm) were prepared on the buccal surfaces using silicon carbide abrasive papers. Artificial incipient caries lesions were induced in 20 specimens, while the remaining teeth served as the sound enamel group. Each group was subdivided into two subgroups (n = 10) according to the type of flowable resin composite used: a self-adhering flowable composite (Vertise Flow; Kerr, USA) and a conventional flowable composite (Filtek Z350; 3M ESPE, USA). Composite buildups with a height of 5 mm were placed on the prepared enamel surfaces following the manufacturers’ instructions. The specimens were sectioned to obtain beam-shaped samples with a cross-sectional area of approximately 1 × 1 mm², and the microtensile bond strength (µTBS) was measured using a universal testing machine. Data were analyzed by two-way ANOVA (alpha=0.05).
Results: The highest μTBS was found in the Z350 Flow composite with intact enamel, while the lowest was observed in Vertise Flow with incipient caries enamel (P˂0.001). In addition, a significant difference in μTBS was found between the two composite groups in both intact and incipient caries enamels (P <0.001).
Conclusion: These findings suggest that conventional flowable composites can provide more reliable bonding performance than self-adhering flowable composites, particularly when bonding to caries-affected enamel.
Type of Study: Research Paper |
Subject:
Restorative Dentistry
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