Bond strength of orthodontic brackets to temporary crown

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Dr. Prashanth R, Dr. Divya Swarup, Dr. Deepak Singh, Dr. Shanahaz K Saidalavi, Dr. Farzzana Mehraj, Dr. Shivani Arora


Background: This study was conducted to assess the Bond strength of orthodontic brackets to temporary crown. Material and methods: A bisacrylic composite was utilized to fabricate a total of seventy five discs, which were subsequently divided into five groups (n = 20) based on the type of surface treatment applied. The surface treatments included the use of black, blue, as well as green diamond burs, as well as sandblasting. Additionally, a control group was included in the study. The process of bonding metal orthodontic brackets to discs was carried out in a standardized conventional manner. The specimens underwent thermocycling, wherein they were exposed to five thousand cycles of alternate water baths at temperatures of five degrees Celsius and fifty five degrees Celsius. The shear bond strength test was conducted with a universal testing equipment. The surface treatment impact and features of debonded surfaces were analyzed using a scanning electron microscope (SEM). The analysis and classification of the remaining composite resin on the surfaces of the specimens were conducted using the adhesive remnant index. A one-way analysis of variance (ANOVA) was conducted with a significance level (α) of 0.05. Results: The average shear bond strength seen in the control group was documented as 10.63 ± 5.45 MPa, indicating a relatively higher value compared to the mean shear bond strength of 8.47 ± 4.11 MPa observed in the blue bur group. However, this difference was not statistically significant. However, the reported values were lower than the respective means seen in the green bur, black bur, and sandblasting. The results of the one-way analysis of variance (ANOVA) indicated a statistically significant difference in means throughout the five groups. However, when comparing the control and blue groups, a significant difference in shear bond strength was observed solely in relation to the sandblasting technique. Conclusion: The application of thermocycling conditions has been found to enhance the bond strength of orthodontic brackets through the process of sandblasting provisional crowns.

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