Effect of S-PRG containing coat on the shear bond strength and the prevention of enamel microcrack formation after orthodontic bracket removal: an invitro study.

چکیده اصلی

BACKGROUND: Among the most common complications after orthodontic treatment are enamel microcracks. These issues arise either from enamel demineralization or during bracket debonding or adhesive remnant removal after bracket removal; thus, the current investigation attempts to assess the impact of S-PRG comprising coat on the shear bond strength of the bonded resin composite and the prevention of enamel microcrack formation following orthodontic bracket removal. METHODS: Fourteen sound, intact human premolars recently extracted were collected. A scanning electron microscope (SEM) was used to assess the enamel surface to exclude teeth with micro-cracks. The teeth were divided randomly into two groups (n = 7). In group 1 (control group), the metal bracket was bonded to the etched enamel with (Beauti-Bond xtreme, SHOFU, Japan) adhesive and a thin layer of (Beautifil II Giomer, SHOFU, Japan). In group 2 (intervention group), PRG BarrierCoat® (SHOFU, Japan) was applied on the etched enamel prior to adhesive application. The teeth were then subjected to shear bond strength (SBS) testing using a universal testing machine. SEM and quantitative elemental analysis (weight%) by EDX spectrometry were performed by a calibrated examiner to all teeth to determine the enamel microcrack formation after debonding. The data were analyzed using Fisher's exact test, independent t-test and the point biserial correlation coefficient. The significance level was set at p < 0.05 within all tests. RESULTS: For SBS, Ca weight, and Ca/P, group (2) had significantly higher mean values than group (1). In contrast, the difference in P weight was not statistically significant. Additionally, the percentage of crack formation in group (1) was higher than that of group (2); however, the difference was not statistically significant. For Ca weight and Ca/P, there was a strong negative correlation with crack formation, with higher mean values significantly associated with the absence of cracks. For P weight, the correlation was not statistically significant. CONCLUSIONS: PRG BarrierCoat® shows promise in enhancing shear bond strength with metal brackets. The high mineral content of PRG BarrierCoat® enhances the integrity of enamel and helps in the prevention of microcrack formation. However, additional long-term clinical trials are required to confirm these findings under dynamic oral conditions.

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