Effect of endodontic irrigation on bonding of resin cement to radicular dentin

Abstract

The influence of endodontic irrigation on shear bond strengths of resin cement to radicular dentin was investigated. Human radicular dentin blocks were divided into four groups and subjected to one of four endodontic irrigations: ethylenediaminetetraacetic acid (EDTA) group, 17% EDTA for 60 s; EDTA/sodium hypochlorite (NaOCl) group, 17% EDTA for 60 s followed by 10 ml of 5% NaOCl for 15 s; NaOCl group, 10 ml of 5% NaOCl for 15 s; and control group, no treatment. Morphological changes of dentin surface after endodontic irrigation were observed by scanning electron microscopy (SEM). A resin block was bonded to the radicular dentin after irrigation using resin cement with either wet-bonding (Uni-Etch/One-Step; Bisco) or self-etching (Tyrian SPE/One-Step Plus; Bisco) adhesives. Shear bond strengths were measured and the penetration of resin tags into dentinal tubules at resin-dentin interface was observed by SEM. With the wet-bonding system, the shear bond strengths for the EDTA/NaOCl group, in which dentinal tubules openings and uniform resin tag penetration into dentinal tubules were observed, were significantly higher than the EDTA and control groups. With the self-etching system, the shear bond strengths were significantly lower in the EDTA group compared with the NaOCl and control groups. The effects of endodontic irrigation on the bonding of resin cement to radicular dentin depended on the dentin bonding system used.

Push-out bond strength of a new post system after various post space treatments

“…Chemical agents such as NaOCl, H2O2, EDTA, chlorhexidine digluconate (CHX), citric acid, orthophosphoric acid (H 3PO4), and their combinations are used to increase the micromechanical retention of the cement by removing the smear layer. As a result, the cement can penetrate into the dentinal tubules 4,[8][9][10] . The most irrigant used is sodium hypochlorite because of its good tissue dissolving 11) and effective antimicrobial capabilities 12) .…”

“…During the preparation of the post space, drills create a new smear layer that is rich in sealer and gutta-percha remnants 7) . The removal of the smear layer, which contains microorganisms, infectious dentin, canal sealer remnants, and which can influence the polymerization of resin luting cements, is essential to the bonding of post to dentin with resin 4,8) . Chemical agents such as NaOCl, H2O2, EDTA, chlorhexidine digluconate (CHX), citric acid, orthophosphoric acid (H 3PO4), and their combinations are used to increase the micromechanical retention of the cement by removing the smear layer.…”

“…The use of fiber-reinforced posts is a widely accepted because of an elastic modulus similar to that of dentine 2) , and an ability to be bonded to dentin using an adhesive technique 3) . To improve the retention of the composite core to post and tooth, prefabricated fiber posts are cemented with adhesives and composite resin luting cements to dentin 4) . Several variables may affect the quality of adhesion at the dentine-cementpost interfaces: the action of irrigant solutions such as sodium hypochlorite (NaOCl), hydrogen peroxide (H 2O2) and ethylenediaminetetraacetic acid (EDTA), the type of agent used to condition the substrate; the polymerization stress of resin cement; and the chemical and physical properties of the posts 5,6) .…”

İki̇ Farkli Kanal Patinin Farkli İrri̇gasyon Solüsyonlari Kullanilarak Push-Out Yöntemi̇ İle Denti̇ne Bağlanma Di̇rençleri̇ni̇n Değerlendi̇ri̇lmesi̇

“…21 Kanal patı ile kanal duvarı arasındaki bağlantı ve smear tabakasının bağlanma direnci üzerine olan etkisi birçok çalışma ile incelenmiştir. 14,19,20,[22][23][24][25][26][27] …”

Influence of storage times on bond strength of resin cements to root canal

“…The impact of EDTA and NaOCl on bond strength has been observed higher values, in which have effective in removing the smear layer in root canals. In contrast, EDTA used with a combination of NaOCl can easily produce erosion surfaces with complete opening of the dentin tubules 22 . RelyX TM U100 (Clicker TM Dispenser) or Unicem (Aplicap TM ) consists of specially designed multifunctional, phosphoric acid modified methacrylate monomers that form a highly cross-linked cement matrix during radical polymerization, whereas the phosphoric acid groups contribute to self-adhesion, the carbon double bonds cause a high reactivity of the methacrylate monomers with each other.…”