Volume 5 Issue 6 (November - December), 2019

Original Articles

COMPARISON OF SHEAR BOND STRENGTH OF ORTHODONTIC METAL BRACKETS TO PORCELAIN SURFACES USING DIFFERENT SURFACE TREATMENTS-AN IN-VITRO STUDY
Mohammad Abhoo Becker, Soumya KS, Gautham N, Sumit Kalsi, Santosh R

Background: Bonding orthodontic brackets to porcelain/ceramic surfaces presents a higher degree of failure when compared to bonding to enamel. Hence; the present study was undertaken for comparing the shear bond strength of orthodontic brackets bonded with resin modified glass ionomer cement and composite resin on porcelain surfaces treated with hydroflouric acid and silane coupling agent. Materials & methods: Eighty porcelain discs are divided into 4 groups of 20 discs each. The mounted discs are surface deglazed by aluminium oxide sandblasting, rinsed with water and air dried. Group I – 20 porcelein disc surfaces were etched with 9.6 per cent hydroflouric acid gel for 120 seconds. Group II- 20 porcelein disc surfaces were etched with 9.6 per cent hydroflouric acid gel for 120 seconds. Group III –20 porcelein disc surfaces were coated with silane coupling agent according to the manufacturer’s instructions and allowed to dry for 60 seconds. Group IV- 20 porcelein disc surfaces were coated with silane coupling agent according to the manufacturer’s instructions and allowed to dry for 60 seconds. The shear bond strength test was conducted in the laboratory of analytical research and metallurgical laboratories. Results: There is a significant difference in shear bond strength of metal brackets bonded to porcelain surfaces using hydroflouric acid and silane coupling agents. There is a significant difference in shear bond strength of metal backets bonded to porcelain surfaces using resin modified glass ionomer cement and light cure composite resin. There is no statistically significant difference in the ARI scores after debonding when using hydrofluoric acid and silane coupling agent. There is no statistically significant difference in the ARI scores after debonding when using light cure composite resin and resin modified glass ionomer cement. Conclusion: Surface conditioning alone without silanation produced significantly low SBS. The use of silane was the single most important factor in determining satisfactory bond strength. Sand blasting followed by silanation produced favorable bond strength and might have the potential to replace alternative methods. Key words: Bond, Strength, Orthodontic

 
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