CC BY-NC-ND 4.0 · Eur J Dent 2015; 09(02): 176-182
DOI: 10.4103/1305-7456.156799
Original Article
Dental Investigation Society

Bonding of contemporary glass ionomer cements to different tooth substrates; microshear bond strength and scanning electron microscope study

Aliaa Mohamed El Wakeel
1  Department of Conservative Dentistry, Faculty of Dental Medicine, Modern Sciences and Arts University, Cairo, Egypt
,
Dina Wafik Elkassas
2  Department of Operative Dentistry, Faculty of Oral and Dental Medicine, Misr International University, Cairo, Egypt
,
Mai Mahmoud Yousry
3  Department of Operative Dentistry, Faculty of Oral and Dental Medicine, Cairo University, Cairo, Egypt
› Author Affiliations
Further Information

Publication History

Publication Date:
04 September 2019 (online)

ABSTRACT

Objective: This study was conducted to evaluate the microshear bond strength (μSBS) and ultramorphological characterization of glass ionomer (GI) cements; conventional GI cement (Fuji IX, CGI), resin modified GI (Fuji II LC, RMGI) and nano-ionomer (Ketac N100, NI) to enamel, dentin and cementum substrates. Materials and Methods: Forty-five lower molars were sectioned above the cemento-enamel junction. The occlusal surfaces were ground flat to obtain enamel and dentin substrates, meanwhile the cervical one-third of the root portion were utilized to evaluate the bonding efficacy to cementum substrate. Each substrate received microcylinders from the three tested materials; which were applied according to manufacturer instructions. μSBS was assessed using a universal testing machine. The data were analyzed using two-way analysis of variance (ANOVA) and Tukey’s post-hoc test. Modes of failure were examined using stereomicroscope at ×25 magnification. Interfacial analysis of the bonded specimens was carried out using environmental field emission scanning electron microscope. Results: Two-way ANOVA revealed that materials, substrates and their interaction had a statistically significant effect on the mean μSBS values at P values; <0.0001, 0.0108 and 0.0037 respectively. RMGI showed statistically significant the highest μSBS values to all examined tooth substrates. CGI and RMGI show substrate independent bonding efficiency, meanwhile; NI showed higher μSBS values to dentin and cementum compared to enamel. Conclusion: Despite technological development of GI materials, mainly the nano-particles use, better results have not been achieved for both investigations, when compared to RMGI, independent of tooth substrate.