Effect of cement type and thickness on push-out bond strength of fiber posts

Abstract

Background. This study investigated the effect of the thickness of two resin cements on push-out bond strength of fiber posts to root dentin. Methods. Sixty decoronated single-rooted teeth were endodontically treated. The specimens were then randomly allocated to two groups (n=30); group 1: drill size 90 w, matching the size of fiber posts used; group 2: drill size 110, larger than the posts. The specimens in each group were divided into 2 subgroups (n=15); subgroup SE, in which the posts were cemented with self-etch Panavia F2.0 and subgroup SA, in which self-adhesive Panavia cement was used. After 72 hours, 2 slices with 1 mm of thickness were prepared from the mid-root of each specimen. Push-out bond strength test was performed in a universal testing machine at a crosshead speed of 1 mm/min. Data were analyzed with two-way ANOVA and t-test. Results. The mean bond strengths of the posts cemented in matched-size spaces for SE and SA groups were 4.02±1.6 and 4.12±2.3 MPa, respectively. For posts cemented in oversized spaces, the values were 4.9±2.3 and 2.8±1.3 MPa, respectively. In matched-size spaces, there was no significant difference between the two groups. Conclusion. The results of this study suggested that increasing the cement thickness would reduce the bond strength of fiber posts to root dentin when self-adhesive cements are used; however, self-etch adhesives were not affected.

Biomechanical performance of three fiberglass post cementation techniques: Imaging, <i>in vitro</i>, and <i>in silico</i> analysis

“…Corroborating the findings of other studies [10,36], RFP allowed the formation of a more homogeneous and relatively thin cementation line, making the observation of structural defects at the interface difficult [2,22]. The intimate contact of the post/resin composite/ cement with the root canal walls is believed to promote micromechanical adhesion and greater frictional retention [3,37], which explains the excellent performance in the bond strength analysis of this group.…”

“…Additionally, the bond strength can also be influenced by the location of these structural defects because the distribution of voids and gaps is not uniform across the cementing layer, regardless of the group [27]. Similarly, the higher incidence of these defects in the cement layer increased the dissolution and degradation levels of the material, resulting in decreased post installation retention [10], making it possible to assume a predisposition to adhesive fracture in the mechanical test, as observed in the analyses.…”

Efficacy of Different Dentin Posts for the Treatment of Primary Anterior Teeth (An In vitro study)

“…Farid et al (26) stated that an increase in cement thickness when the canal diameter is markedly larger than the post diameter would decrease bond strength of fiber posts to root dentin after using selfadhesive cement; but, the self-etch adhesives were not affected.…”

Influência do uso do microscópio clínico como auxiliar para realizar a cimentação adesiva de pino de fibra de vidro: Uma análise da resistência de união

“…Na avaliação laboratorial por meio de ensaios mecânicos são aplicadas cargas na interface adesiva, gerando estresse entre os materiais e/ou substrato, de forma que quanto maiores os valores de união maior será a resistência dos materiais na interface adesiva frente ao estresse. (Wandscher et al, 2014;Skupien et al, 2015;Barreto et al, 2016;Farid et al, 2018, Silva et al, 2019 O microscópio clínico é um recurso tecnológico muito utilizado nos procedimentos de endodontia, pois, proporciona maior visibilidade devido a sua capacidade de ampliação e iluminação (Silva et al, 2019), além de melhorar a capacidade do operador de limpar e instrumentar de forma mais eficiente os canais radiculares, e visualizar restos de guta percha em casos de retratamento (Silva et al, 2019).…”