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ORIGINAL RESEARCH Table of Contents   
Year : 2013  |  Volume : 24  |  Issue : 6  |  Page : 713-718
Comparison of shear bond strengths of conventional orthodontic composite and nano-ceramic restorative composite: An in vitro study

1 Department of Orthodontics, Pacific Dental College and Hospital, Debari, Udaipur, Rajasthan, India
2 Department of Orthodontics, PMNM Dental College and Hospital, Bagalkot, Karnataka, India

Correspondence Address:
Namit Nagar
Department of Orthodontics, Pacific Dental College and Hospital, Debari, Udaipur, Rajasthan
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0970-9290.127619

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Objectives: To compare the shear bond strength of a nano-ceramic restorative composite Ceram-X MonoTM, a restorative resin with the traditional orthodontic composite Transbond XTTM† and to evaluate the site of bond failure using Adhesive Remnant Index. Materials and Methods: Sixty extracted human premolars were divided into two groups of 30 each. Stainless steel brackets were bonded using Transbond XTTM† (Group I) and Ceram-X MonoTM (Group II) according to manufacturer's protocol. Shear bond strength was measured on Universal testing machine at crosshead speed of 1 mm/minute. Adhesive Remnant Index scores were assigned to debonded brackets of each group. Data was analyzed using unpaired 't' test and Chi square test. Results: The mean shear bond strength of Group I (Transbond XTTM†) was 12.89 MPa ± 2.19 and that of Group II (Ceram-X MonoTM) was 7.29 MPa ± 1.76. Unpaired 't' test revealed statistically significant differences amongst the shear bond strength of the samples measured. Chi-square test revealed statistically insignificant differences amongst the ARI scores of the samples measured. Conclusions: Ceram-X MonoTM had a lesser mean shear bond strength when compared to Transbond XTTM† which was statistically significant difference. However, the mean shear bond of Ceram X Mono was within the clinically acceptable range for bonding. Ceram-X MonoTM† and Transbond XTTM† showed cohesive fracture of adhesive in 72.6% and 66.6% of the specimens, respectively.

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