Influence of different adhesive systems on the pull-out bond strength of glass fiber posts

Abstract

This in vitro study evaluated the tensile bond strength of glass fiber posts (Reforpost – Angelus-Brazil) cemented to root dentin with a resin cement (RelyX ARC – 3M/ESPE) associated with two different adhesive systems (Adper Single Bond - 3M/ESPE and Adper Scotchbond Multi Purpose (MP) Plus – 3M/ESPE), using the pull-out test. Twenty single-rooted human teeth with standardized root canals were randomly assigned to 2 groups (n=10): G1- etching with 37% phosphoric acid gel (3M/ESPE) + Adper Single Bond + #1 post (Reforpost – Angelus) + four #1 accessory posts (Reforpin – Angelus) + resin cement; G2- etching with 37% phosphoric acid gel + Adper Scotchbond MP Plus + #1 post + four #1 accessory posts + resin cement. The specimens were stored in distilled water at 37°C for 7 days and submitted to the pull-out test in a universal testing machine (EMIC) at a crosshead speed of 0.5 mm/min. The mean values of bond strength (kgf) and standard deviation were: G1- 29.163 ± 7.123; G2- 37.752 ±13.054. Statistical analysis (Student's t-test; α=0.05 showed no statistically significant difference (p<0.05) between the groups. Adhesive bonding failures between resin cement and root canal dentin surface were observed in both groups, with non-polymerized resin cement in the apical portion of the post space when Single Bond was used (G1). The type of adhesive system employed on the fiber post cementation did not influence the pull-out bond strength.

Restoration of endodontically treated teeth with major hard tissue loss – bond strength of conventionally and adhesively luted fiber‐reinforced composite posts

“…Another application of the pull‐out test seems to be the testing of posts with macro‐retentive surface designs. The lack of a failure analysis and restricting the analysis to the post during a pull‐out bond strength test are disadvantages compared to the push‐out and microtensile tests, where it is easier to carry out fracture analysis of all components. To overcome this problem, we sectioned the teeth longitudinally to allow failure analysis of the post as well as of the two tooth halves.…”

Bond strength of glass fiber posts submitted to different luting protocols

“…The use of adhesive systems promotes an effective bonding of the resin luting agent to root dentin, which is a relevant factor for adhesive longevity [4]. Prefabricated posts show an interaction with the adhesive systems therefore resulting in higher retention, easier luting procedure, and simpler technique [5,6,7].…”

“…The composition of the endodontic cement may also affect the bonding of the resin luting agent to root dentin. The effect of endodontic cements on the retention of intraradicular posts has pointed out to a decrease of the bond strength of resin luting agents to root canals filled with eugenol-based materials [5]. Eugenol interferes in the polymerization of resin compounds because it alters their mechanical and physical properties due to its contact to the root walls and penetration within dentinal tubules thus affecting the retention of glass fiber posts [8,9,10].…”

“…The steps of acid etching, primer and bonding agent application are eliminated. After its mixing, the luting procedure is simplified and its application is a single clinical step [4,5].…”

Resistência da união da cimentação adesiva de pinos de fibra de vidro frente ao teste de remoção por extrusão

“…Durante todo o preparo endodôntico neste trabalho, os canais foram irrigados com água deionizada, para que se evitassem possíveis variáveis resultantes do uso de outros materiais irrigadores oxidantes disponíveis, como H 2 O 2 e NaOCl (Pirani et al, 2005;Silva et al, 2008).…”