تأثير زمن وشدة التصليب باستخدام جهاز التصليب الضوئي ثنائي القطب عالي الطاقة على مقاومة ارتباط الحاصرات المعدنية لجهد القص

الملخص EN

Background and Objective: The time factor is extremely important during the treatment process for the orthodontics dentist and patients alike, which necessitated greater attention to the time curing while naturally conserving the degree of stability of orthodontic brackets bonded adhesive against the masticatory and orthodontic forces in their various forms, as this research aimed to assessment the influence of time and intensity curing by using high power led on shear bond strength of metal brackets.

Materials and Methods: The sample consisted of 108 upper premolars was divided into three main groups classified according to the curing time and intensity.

Consequently, the first group was cured with a time of 20 seconds and a light intensity of 1200 mw/cm2, and the second group was cured with a time of 5 seconds and a light intensity 2000 mw/cm2, whereas the third group was cured with a time of 3 seconds and a light intensity 2500 mw/cm2 using a high power led.

The brackets bonded resistance of the premolars to shear bond strength was assessed by the means of a standard test device(Instron).

The residual adhesive remnant index(ARI) was also studied on the enamel surfaces of the premolars after debonding the metal brackets via streoscope device.

Results: The results showed statistically significant differences in terms of shear bond strength of brackets, as p-value greater than 0.05 when using Tukey HSD test, which was undertaken between the first and second group, whereas the differences were not significant between the second and third groups.

Also, we did not observe statistically significant differences between the frequencies of ARI between three groups.

Conclusion: Reducing the time of curing up to 5 seconds and 3 seconds with the high intensity of curing up to 2000-2500 mw/cm2 respectively showed a good bonding of orthodontic brackets within the clinically acceptable limits and securely on the tooth enamel.