Effect of ascorbic acid on bond strength between the hydrogen peroxide-treated fiber posts and composite resin cores

Abstract

Aim:This study evaluated the effect of 10% ascorbic acid on the bond strength between fiber post and composite resin core after applying 24% hydrogen peroxide.Materials and Methods:Twenty-four hydrogen peroxide-treated fiber posts were divided into 4 groups (n = 6). Group 1 was the control group with no treatment. In groups 2-4, post surfaces were treated with 10% v ascorbic acid solution for 10, 30 and 60 minutes, respectively. Cores were built up using flowable composite resin. Two sticks were prepared from each specimen. Microtensile bond strength test was performed for each stick. Failure modes of sticks were evaluated under a stereomicroscope (×20). Surface morphologies of two fractured sticks from each group were assessed by SEM.Statistical analysis:Data were analyzed using one-way ANOVA and Tukey HSD tests (α = 0.05).Results:The highest microtensile bond strength was observed in Group 4 (20.55 ± 2.09) and the lowest in Group 1 (10.10 ± 0.55). There were significant differences in microtensile bond strength between all the groups (P < 0.05).Conclusion:It is concluded that ascorbic acid application increased the microtensile bond strength between the hydrogen peroxide treated fiber post and composite resin core. The increase is dependent on the duration of exposure to the antioxidant.

Test methods for bond strength of glass fiber posts to dentin: A review

“…Highly cross-linked epoxy resins with high degree of conversion constitute the main [86,[121][122][123][124]. The application of ascorbic acid is dependent on the increasing duration of exposure to the antioxidant [124]. Other examples are the use of ethanol [70,86], antioxidants such hesperidin, sodium ascorbate or rosmarinic acid [123].…”

“…Highly cross-linked epoxy resins with high degree of conversion constitute the main [86,[121][122][123][124]. The application of ascorbic acid is dependent on the increasing duration of exposure to the antioxidant [124].…”

Irrigación del conducto radicular y tratamiento de superficie de pernos de fibra, previo a la cementación: revisión de tema

“…Por tal motivo, Arısu et al en el 2013, Kul et al 2016, Crispim da Silveira et al 2014, entre otros autores, realizan comparaciones en los diferentes segmentos con empleando varias soluciones irrigadoras en las que se puede evidenciar comportamiento variado en cada una de ellas (5,7,8,10,11,12) Es importante tener en cuenta que la matriz del perno de fibra debe mantenerse después de su tratamiento ya sea este químico o mecánico, es decir, dicho tratamiento debe mejorar la adhesión sin alterar la estructura del mismo. Esta característica se la puede observar bajo microscopía electrónica después del desprendimiento del mismo del conducto radicular como lo indican Monticelli et al, Mazzitelli et al, Talebian et al (13,14,15,16) Por ello el propósito de esta revisión consiste en identificar tanto el tratamiento de superficie de pernos de fibra como el irrigante radicular idóneos para conseguir una cementación adecuada y, asimismo, conocer cuál es el tratamiento de superficie que produce menos desintegración de las fibras del perno de fibra.…”

Microtensile bond strength between a UDMA fiber post and different resin cements: Effect of pre-surface treatment

“…Glass-fiber posts are generally composed of reinforced glass fibers embedded in PMMA epoxy resin 5,12) or, in some cases, urethane dimethacrylate (UDMA) 13) , both of which have a similar flexural strength 14) . Some authors have reported a difficulty in creating a strong mechanical interlock between the luting agent materials and the PMMA epoxy resin utilized in most commercial fiber posts, without having some form of surface treatment [15][16][17][18][19][20][21] . Some examples of surface treatments are: particle sandblasting with Al2O3; chemical etching with ethyl alcohol or hydrogen peroxide; plasma etching; and other available treatments [18][19][20][21][22] .…”

“…Some authors have reported a difficulty in creating a strong mechanical interlock between the luting agent materials and the PMMA epoxy resin utilized in most commercial fiber posts, without having some form of surface treatment [15][16][17][18][19][20][21] . Some examples of surface treatments are: particle sandblasting with Al2O3; chemical etching with ethyl alcohol or hydrogen peroxide; plasma etching; and other available treatments [18][19][20][21][22] . Finally, a silane coupling treatment is utilized to establish a chemical bond between the treated post surface and the luting agent/core build-up material [23][24][25] .…”