Evaluation of the Addition of Chitosan and Nanoparticles of Titanium Dioxide on the Shear Bond Strength of Glass Ionomer Cement

Increasing adhesion of restorative glass ionomer cement to the tooth surface leads to reduction of recurrent caries and improvement of restoration durability. In present study, effect of Chitosan and nanoparticles of Titanium dioxide on glass ionomer cement adhesion to the tooth surface was investigated.

On dentinal surface of 56 buccal and lingual surfaces of 28 extracted human third molar, four different kind of glass ionomer cement were bonded: 1.Non-modified galss ionomer cement 2.Chitosan 10%v/v modified glass ionomer cement 3.NanoTiO2 3%w/w modified glass ionomer cement 4.Dual modified (Chitosan 10%v/v and Nano TiO2 3%w/w) glass inomer cement. samples were kept in humidity of 100% and temperature of 37°C for 24 hours. Shear bond strength of the glass ionomer cements of four groups were measured by Universal Testing Machine and the results were analyzed using Tukey test and ANOVA. FTIR and XRD tests were conducted to evaluate the chemical structure of the glass ionomer cement of each group.

Only shear bond strength results of the group which was simultaneously modified with Chitosan 10%v/v and nanoparticles of Titanium dioxide 3%w/w had shown significant different with the control group (P=0.016). XRD and FTIR tests showed no changes in the chemical structure of the glass ionomer of any modified group in comparision to the control group.

Modification of the restorative glass ionomer cement by Chitosan 10%v/v and nanoparticles of Titanium dioxide 3%w/w simultaneously, leads to improvement of the shear bond strength of glass ionomer cement to the tooth structure.