Effect of eugenol-based endodontic sealer on the adhesion of intraradicular posts cemented after different periods

Abstract

Objective:This study evaluated in vitro the influence of an eugenol-based sealer (EndoFill) on the retention of stainless steel prefabricated posts cemented with zinc phosphate and resin-based (Panavia F) cements after different periods of root canal obturation, using the pull-out test.Material and methods:Sixty upper canines were decoronated and the roots were embedded in resin blocks. The specimens were distributed into 3 groups, according to the period elapsed between canal obturation and post cementation: Group I - immediately; Group II - 72 h and Group III - 4 months. The groups were subdivided according to the type of cement used for post cementation: A - zinc phosphate and B - Panavia F. Following the experimental periods, specimens were subjected to pull- out test in an Instron machine with application of tensile force at a crosshead speed of 0.5 mm/min until post dislodgement. The maximum forces required for post removal were recorded (kN) and means were subjected to statistical analysis by 2-way ANOVA and Tukey-Kramer test (α=0.001)Results:There were statistically significant differences (p<0.01) between the posts cemented with zinc phosphate cement (0.2112 kN) and Panavia F (0.0501 kN). However, no statistically significant differences (p>0.05) were found between the three post cementation periods, regardless of the cement.Conclusions:It was concluded that the eugenol-based sealer influenced the tensile strength of the posts cemented with the resin cement, but had no influence on the time waited between root canal obturation and post space preparation/post cementation.

Evaluation of Apical Contamination in Teeth with Prefabricated Posts Fixed with Different Dental Cements

“…The use of resinous cement, possibly due to adhesion, has been demonstrated to have a slight superiority compared to other types of cements [12][13][14][15]31,33], being indicated in all cases and cementing with correct cavity cleaning, aiming to eliminate eugenol from endodontic cements, which could alter the adhesive properties of resin cements [34]. In this study, the results obtained with resin cement were similar to glass ionomer cement.…”

“…Studies in literature have assessed the adhesion of intraradicular posts cemented with different cements [12][13][14][15], as well as the fracture resistance of bovine roots restored with different prefabricated posts [16]. Coronal microleakage was assessed by dye ink, comparing posts and cores cemented with permanent and temporary cements, showing that teeth restored with permanent cements had better sealing [17].…”

Effect of Endodontic Retreatment on Push-out Bond Strength and Quality of Fiber Postbonding Interface of Resin Cements

“…[35][36][37] The adverse effect of residual filling material on the bond strength of resin cement has been explained by the fact that longer endodontic sealer contact time with the dentin promotes high penetration of harmful agents through the dentinal tubules. 40,41 Postspace preparation might remove part of the dentin surface, but probably not enough to eliminate the excess cement from the dentinal tubules, especially in the apical third. Further, a heavy smear layer covering the tubules might adversely affect the formation of resin tags that are essential for adhesion of self-etching systems.…”

Avaliação da influência do material obturador na resistência de união de retentor intrarradicular pré-fabricado fixado com resina, em dentes fragilizados, por meio do teste de push-out e MEV

“…Além da camada de smear, há ainda outros fatores que dificultam ou mesmo impedem o processo de hibridização, como as diferentes concentrações de túbulos dentinários por região da raiz, o volume de água presente e a disposição conjunta de materiais de natureza diferente em um mesmo ambiente (CARRIGAN et al, 1984;NAKABAYASHI et al, 1991;DE DEUS et al, 2002;MANNOCCI et al, 2004). Em relação a este último, há evidências que indicam que há influência direta entre os resíduos dos cimentos endodônticos presentes nos túbulos dentinários e os teste de cisalhamento por extrusão (push-out), com velocidade de cruzeta de 0,5 mm/min (MENDOZA et al, 1997;SCHWARTZ et al, 1998;FRANCO et al, 2002;TAGGER et al, 2003;ALFREDO et al, 2006;HAYASHI et al, 2006;MACCARI et al, 2007;PUTIGNANO et al, 2007;DIAS et al, 2009), seguida da análise da interface adesiva em microscopia eletrônica de varredura. As falhas que ocorreram após o teste de push-out foram analisadas e categorizadas como adesivas, coesivas ou mistas, conforme preconizado por SALEH et al (2003).…”

“…Porém, o conhecimento sobre sua influência ou seus constituintes no processo de adesão de retentores intrarradiculares ainda é limitado e tem apresentado resultados conflitantes . Alguns autores relataram que a presença de eugenol nas paredes do canal exerceu efeito adverso na adesão de agentes resinosos (TJAN; NEMETZ, 1992;BOONE et al, 2001;NGOH et al, 2001;HAGGE et al, 2002a;HAGGE et al, 2002b;ALFREDO et al, 2006;DIAS et al, 2009) enquanto outros não observaram nenhuma diferença na retenção de pinos cimentados com resina em canais obturados com diferentes tipos de cimentos .…”