Effect of ethanol-wet bonding on porosity and retention of fiberglass post to root dentin

Abstract

Effect of ethanol-wet bonding on porosity and retention of fiberglass post to root dentin Abstract: This in vitro study aimed to assess the effects of different pretreatments used to adapt glass-fiber posts cemented to root canals with different resin cements, regarding porosity percentage and bond strength. Twelve bovine incisor roots were prepared with Largo drills. After post space preparation, the specimens were randomized into two types of pretreatment groups (n = 3): water-wet bonding and ethanol-wet bonding. After the post were cemented, the roots were stored in 100% humidity at room temperature for 7 days. The samples were scanned by microcomputed tomography (micro-CT). Images were reconstructed by NRecon software, and CTAn software was used to analyze the porosity percentage (%) at the luting interface. Evaluation of the push-out bond strength was performed by serially cutting the roots, and submitting the slices to testing. Additionally, the resin cement post-gel shrinkage values (%) were measured using the strain-gauge method (n = 10). Data were analyzed by two-way ANOVA, Tukey's test and Student's t test (a = 0.05). The roots prepared with ethanol-wet bonding using RelyX TM U200 had significantly lower porosity in the coronal and apical thirds (p < 0.05). The group prepared with ethanol-wet bonding using RelyX TM ARC presented better bond strength results in the coronal and apical thirds (p < 0.05). RelyX TM ARC (0.97%) produced a higher post-gel shrinkage value than RelyX™ U200 (0.77%). Canals pretreated with ethanol-wet bonding presented better outcomes in regard to porosity percentage and push-out bond strength.

Analysis of the adhesive interface of dentine treated with carbodiimide and chitosan before cementation of fiberglass posts with different resin cements

“…71 Achieving a homogeneous resin cement-root dentine interface free of structural defects is essential for the stability of the restoration of endodontically treated teeth with fiberglass posts. 2 The better adaptation of the adhesive interface and the smaller amount of voids and gaps result in less marginal leakage, high values of bond strength, and a subsequent increase in the longevity of the adhesive interface. 1,8,25,32,61 In this sense, given the results obtained in the present study and based on the literature, it is possible to affirm that the use of carbodiimide (EDC) and chitosan can improve the quality of the resin cement-root dentine interface, and can be promising strategies to improve the mechanical properties of dentine, such as bond strength, tensile strength and modulus of elasticity, as well as increased longevity of adhesive restorations.…”

“…In the face of the indication of the use of intraradicular posts to improve the retention of restorations in endodontically treated teeth, 1 fiberglass posts associated with adhesive cementation are often used, 2–4 and the durability of the bond between resin cement and dentine has a fundamental role in the longevity of restorations 5 . However, despite significant advances in the field of adhesive dentistry over the past few years, the long‐term stability of the adhesive interface is still questionable 5 .…”

Effect of Glass Fiber Post Surface Treatment on Bond Strength of a Self-Adhesive Resin Cement: An “In Vitro” Study

“…The success of adhesive cementation inside the root canal, mainly at the apical level, can be compromised by several factors. The nonuniformity of dentin hybridization and resin tags more frequently in the cervical region than in the apical region, where the tubular density is lower [ 9 , 35 , 36 ], favor the cervical region regarding BS [ 8 , 19 ]. Other influencing factors include greater access to the cervical portion of the canal for cleaning, light transmission into the canal walls, and humidity control.…”

Comparison of the effect of QMix and conventional root canal irrigants on push‐out bond strength of fiber post to root dentin

“…Optimal bonding of cement to root dentin is difficult to achieve (Bouillaguet et al, 2003). Thus, the C‐factor is high in this region, which would generate a high stress due to shrinkage of resin cement against the canal wall, that would compete with the bond strength at the adhesive interface (Carvalho et al, 2020). Moreover, according to Abreu et al (2020), higher frequency of adhesive failure at the resin cement‐root dentin interface is due to chemical compatibility of the resin matrix of fiber post with cement and also adequate wetting of the post with the cement when bonding the fiber post margins.…”