Microleakage Beneath Orthodontic Metal Brackets Bonded After Thermocycling with Two Different Adhesive Systems of Different Temperatures: an in-vitro Study | ||||
| Dental Science Updates | ||||
| Volume 6, Issue 2, September 2025, Page 253-261 PDF (902.79 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/dsu.2025.252424.1209 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Ahmad Bassal  1; Hanady Samih 2; Ahmed Abdelfattah Ramadan 3
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| 1Suez Canal University Hospitals | ||||
| 2Associate professor Suez Canal University | ||||
| 3Orthodontics, dentistry, Suez Canal University, Egypt | ||||
| Abstract | ||||
| Introduction: The possibility of using traditional composite restoratives has been raised to bond orthodontic brackets. The higher viscosity observed with restorative composites compromised their ability to adhere to the bracket base. Pre-heating the restorative composites puts the monomers into a state of thermal agitation that increases molecular motion which enhances flowability. The first null hypothesis was that microleakage underneath brackets using bulk fill composite was comparable to that of conventional orthodontic adhesives. Additionally, a second null hypothesis was set up, that preheating bulk fill composite before polymerization decreased the polymerization shrinkage hence the microleakage scores. Materials and methods: A sample of 56 upper first premolars was collected and divided across 4 groups; I: Transbond XT at room temperature; II: Transbond XT preheated to 60ºC; III: X-tra fil at room temp; and IV: X-tra fil preheated to 60ºC. After thermocycling, roots were coated with wax while crowns with nail varnish then submerged into a solution of 2% methylene blue. After roots were cut off, the remaining crowns in every group were divided into 2 subgroups, those of one subgroup were longitudinally split into mesial and distal halves, while those of the other subgroup were transversely split into gingival and occlusal halves. Depth of dye penetration at the adhesive-enamel interface was measured under stereomicroscope at x45 magnification. Results: photopolymerization of x-tra fil after preheating has exhibited lesser microleakage when compared to Transbond XT, however the results rendered statistically insignificant. Conclusion: The X-tra fil proved to be a reliable adhesive for orthodontic brackets. | ||||
| Keywords | ||||
| bulk fill; microleakage; preheating; x-tra fil | ||||
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