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Abstract
Phytic acid (IP6) has the ability to etch tooth structure due to its acidity and chelating properties. This study aimed to evaluate the micro-tensile bond strength (μTBS) of resin-based cement to enamel and dentin using manufacturer-provided etchants, phosphoric acid (PA) for enamel and a mixture of 10% citric acid and 3% ferric chloride (CAF) for dentin and compare them to IP6. Enamel surfaces were etched for 30 s with either PA or IP6 (1%, 5% or 10%). Dentin surfaces were etched for 15 s with either CAF or 1% IP6. Pre-polymerized composite blocks were bonded to enamel and dentin surfaces. After 24 h, the specimens were sectioned into beams and subjected to μTBS testing. De-bonded specimens and smear layer removal were analyzed with a scanning electron microscope. Etching enamel with 1% and 5% IP6 resulted in μTBS values that are comparable to the control (PA) (p > 0.05), while 10% IP6 negatively affected the μTBS (p < 0.05). The μTBS to dentin etched with 1% IP6 was higher compared to the control (CAF) (p = 0.001). IP6 effectively removed enamel and dentin smear layer, and at specific concentrations, it may be a suitable alternative conditioner agent for bonding resin-based cement to enamel and dentin.
Highlights
Adhesive resin cements are often favored over conventional luting cements because of their valuable mechanical properties [1]
A Tukey post hoc test revealed no significant differences in μTBS to enamel of 1% IP6 (37.9 ± 6 MPa) and 5% IP6 (38.9 ± 5.8 MPa) groups compared to the control group (PA) (38.9 ± 7.2) (p > 0.05)
The individual T-test revealed that the μTBS to dentin of 1% IP6 (31.3 ± 5.4) was significantly higher than the control group (CAF) (25.7 ± 5.6) (p = 0.001)
Summary
Adhesive resin cements are often favored over conventional luting cements because of their valuable mechanical properties [1]. Resin-based adhesive cements are frequently used in dentistry for luting procedures involving prostheses and orthodontic appliances thanks to their ability to bond to enamel, dentin, metal, resin and porcelain [2]. It has been reported that such resin systems have excellent tolerance of dentin contamination with water, saliva, and blood [3], as well as high biocompatibility with pulpal tissue [4]. The monomer and polymer are identical for both enamel and dentin bonding, the dentin conditioner is different to the enamel etching solution in the aforementioned resin cement system. The enamel etchant is composed of phosphoric acid (PA) and the dentin conditioner is made of a mixture of 10%
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