Zinc oxide eugenol paste jeopardises the adhesive bonding to primary dentine
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This was to evaluate the influence of root canal filling pastes on microshear bond strength (µSBS) of an adhesive system to primary dentine.
Human (32) primary molars were randomly assigned into four experimental groups (n = 8): zinc oxide eugenol paste (ZOE); iodoform paste (Guedes-Pinto paste); calcium hydroxide paste thickened with zinc oxide; and no filling paste (control). Flat dentine surfaces were covered with a 1 mm-thick layer of the pastes for 15 min at 37 °C. The pastes were mechanically removed from dentine surfaces, followed by rinsing and drying. After adhesive application (Adper Single Bond 2, 3M ESPE), starch tubes were placed over pre-treated dentine and filled with composite resin (Z250, 3M ESPE). The µSBS test was performed after 24 h of water storage at 37 °C. The failure mode was evaluated using a stereomicroscope. The µSBS values (MPa) were analysed with one-way ANOVA and Tukey post-hoc tests (α = 0.05).
The lowest µSBS values were achieved when ZOE was used. No difference was found among other filling pastes compared with control group. All specimens showed adhesive/mixed failures.
Zinc oxide eugenol paste negatively influenced the bond strength of adhesive systems to primary dentine. Iodoform-based Guedes-Pinto paste and calcium hydroxide paste thickened with zinc oxide did not influence the microshear bond strength values.
KeywordsRoot canal filling materials Primary teeth Pulpectomy Calcium hydroxide Iodoform paste
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
All procedures performed in this study involving human participants (primary human teeth) were in accordance with the ethical standards of the institutional and/or national research committee (Research Ethics Committee—register number: 45105415.9.0000.5346) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
The extracted teeth used in this study came from a tooth bank at the Dental School of the Federal University of Santa Maria. Thus, the research subjects were not contacted in person, since the registration of the teeth and their respective donors is carried out by the tooth bank, which respects the principles of autonomy, justice, beneficence, and non-maleficence.
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