Background: Orthodontic devices should interfere minimally with the patientís comfort, appearance, oral function, and hygiene. The present study was undertaken for assessing and comparing the bonding strength of GIC versus Zinc phosphate in luting of orthodontic bands in Porcelain fused to metal (PFM) crowns. Materials & methods: A total of 30 standard dies of a standard complete crown preparation were prepared. All the 30 samples were divided into two study groups depending upon the type of luting agent used; Group 1 included models in which GIC was used as luting agent for orthodontic bands, whereas Group 2 included models in which Zinc phosphate was used as luting agent for orthodontic bands. All the cemented specimens were mounted on Universal testing machine testing load of dislodgement. All the results were recorded in Microsoft excel sheet and were analysed by SPSS software. Results: Mean bond strength of Group 1 specimens was 1.12 MPa while mean bond strength of Group 2 specimens was 0.36 MPa. On analysing statistically, it was found that mean bond strength of specimens of zinc phosphate group was significantly higher in comparison to specimens of GIC group. Conclusion: Mean bond strength of zinc phosphate cement is significantly higher in comparison to GIC cement.
Key words: GIC, Orthodontic band, Zinc phosphate