Temporary cement residues affect the bond strength and dentin penetration of self‐adhesive resin cement in fiberglass post cementation

Abstract

This study evaluated the persistence of eugenol‐containing (PR, Provy) or eugenol‐free (RT, Relyx Temp, and TB, Temp Bond) temporary cement residues and its effects on push‐out bond strength and dentinal penetration of the self‐adhesive resin cement (Relyx U200). Eighty human roots were endodontically treated and post space prepared. Fourty specimens were distributed in four groups (n = 10): Control (CO), without any clinical procedure, PR, RT, and TB, where a metallic post was cemented with one of the temporary cements. After metallic post removal, hemi sections post space were submitted to SEM analysis. Another specimens were distributed in similar groups, but fiberglass post was cemented using Relyx U200 cement and submitted to push‐out bond strength and dentinal penetration cement analysis, in post space thirds. SEM analysis were evaluated by Kruskal–Wallis and Dunn tests, while bond strength and dentinal penetration were evaluated by ANOVA One‐Way and Tukey test (p < .05). Only in apical thirds, PR, RT, and TB showed higher persistence of residues than CO. In bond strength, PR, RT, and TB showed lower values than CO, in all post space thirds (p < .05). But to dentinal penetration, PR, RT, and TB presented lower values than CO only in apical thirds (p < .05). There is the greatest persistence of temporary cement residues only in apical post space third, providing less dentinal penetration of the self‐adhesive resinous cement. However, the previous use of temporary cements has negative effects on the bond strength cementation system, regardless of the third evaluated.

Effect of immediate dentin sealing and temporary cement removal on bond strength of resin cements to dentin

“…For this proposal, the temporary cements have an important function in retaining the provisional restoration. In this sense, the type of temporary cement and the method used for its removal may affect the adhesion of the resin composite cements to the dental substrate [1][2][3].…”

Effect of mechanical cleaning protocols in the fiber post space on the adhesive interface between universal adhesive and root dentin

“…For an adequate bonding of resin cements to root dentin, a residue‐free dentin surface is essential and the appropriate selection of the cementation system with the correct technique employed could cause substantial results (Bandeca et al, 2016; Morais et al, 2018; Pedreira et al, 2016). In order to have a residue‐free dentin, is necessary the removal of residues of endodontic root canal filling (Zaniboni et al, 2021) and smear layer from the root dentin inside the pulp cavity. In addition, the surface of dentin tubules must be sufficiently cleaned to allow appropriate formation of hybrid layer and resin tags (Schwartz, 2006).…”

Avaliação da resistência de união do sistema de pino de fibra de vidro ajustável em conduto radicular oval tratado endodonticamente

“…O contato direto da luz durante a fotoativação, com potência de 1100mW/cm 2 utilizada no presente estudo, torna a polimerização mais rápida e intensa nos terços cervical e médio, resultando na formação de rede polimérica tridimensional, densa, com ligações cruzadas intermoleculares fortes (ANUSAVICE, 1998) e maior justaposição da interface adesiva (Figuras 12A, 12B, 12D e 12E). Além disso, a morfologia do terço cervical apresenta maior número e diâmetro dos túbulos dentinários, influenciando na maior penetração do cimento autoadesivo (ORDINOLA-ZAPATA et al, 2009;ZANIBONI et al, 2021).…”

“…Além disso, deve-se destacar que as fotomicrografias do terço apical possibilitaram observar remanescente de material obturador (Figuras 12C e 12F) que não foi removido na desobturação do canal para possibilitar a inserção do pino de fibra de vidro, o que provavelmente influenciou nos menores valores de resistência de união, uma vez que os túbulos dentinários podem ter sido revestidos por esses materiais, impedindo a imbricação mecânica do sistema adesivo (BOING et al, 2017;KOSAN et al, 2021;ZANIBONI et al, 2021).…”