Bonding longevity of flowable GIC layer in artificially carious dentin

T. Kerber Tedesco, C. Calil Bonifácio, D. Hesse, C.J. Kleverlaan, T.L. Lenzi, D. Prócida Raggio

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Purpose
To evaluate the bond longevity of glass ionomer cement (GIC) to sound and artificially carious dentin, using a high viscosity material with regular consistency and using a flowable GIC, after one year water storage.

Material and methods
Sixty bovine incisors were polished to obtain flat buccal dentin. Thirty teeth were submitted to pH-cycling model to simulate artificial caries. Teeth from both dentin conditions (sound and caries) were randomly reassigned according to the powder/liquid ratio of the GIC (n=15): (1) regular (1:1) and (2) flowable GIC (1:2). Polyethylene tubes with internal diameter of 0.76 mm were placed over the pre-treated dentin and filled up with GIC (KetacTM Molar Easy Mix, 3M ESPE), immediately protected with a layer of petroleum jelly. Half of the specimens were evaluated by microshear bond strength test after 24 h, the other half was evaluated one year later, after water storage at 37 °C. Data (MPa) were analyzed with 3-way repeated measures ANOVA and Tukey׳s post-hoc tests (α=0.05).

Results
Statistical analysis revealed reduction of GIC bonding effectiveness after one year of water storage (5.4±1.4 to 3.4±1.3 MPa) (p<0.001). No significant differences were observed (p=0.126) between regular (4.2±1.8 MPa) and flowable (4.6±1.5 MPa) GIC consistency. Moreover, GIC showed better bonding effectiveness on sound (5.1±1.7 MPa) than artificially carious dentin (3.7±1.3 MPa) (p<0.001).

Conclusions
Both powder/liquid ratio of GIC show similar reduction of bonding effectiveness after one year, especially in artificially carious dentin substrate.
Original languageEnglish
Pages (from-to)62-66
JournalInternational Journal of Adhesion and Adhesives
Volume51
DOIs
Publication statusPublished - 2014

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