Effect of Incorporating Titanium Dioxide Nanoparticles (۱%) on Shear Bond Strength of Orthodontic Composites: An In Vitro Study
Publish place: Avicenna Journal of Dental Research، Vol: 15، Issue: 1
Publish Year: 1402
نوع سند: مقاله ژورنالی
زبان: English
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JR_AJDR-15-1_006
تاریخ نمایه سازی: 14 آذر 1402
Abstract:
Background: Plaque accumulation and bond failure are the drawbacks of fixed orthodontic treatment.
Titanium dioxide (TiO۲) could be added to orthodontic composite as an antimicrobial agent, but it may
change its mechanical properties. The aim of this study was to evaluate the mechanical properties of
orthodontic composite modified by TiO۲ nanoparticles (NPs) after ۱۰ ۰۰۰ cycles of thermocycling.
Methods: Overall, ۵۰ intact human premolars (extracted for orthodontic treatment) were used in this
study. The orthodontic composite containing TiO۲ NPs (۱% wt) was prepared and used for the bonding of
brackets. The bracket/tooth shear bond strength (SBS) was measured by using a universal testing machine
before and after ۱۰ ۰۰۰ cycles of thermocycling at ۵ and ۵۵°C (dwell time = ۳۰ seconds). Eventually, the
obtained data were analyzed by Student’s t test with the Excel software (significance level ≤ ۰.۰۵).
Results: After thermocycling, the average SBS of TiO۲ containing and control group was ۱۱.۴۳ ± ۵.۱۸ MPa
and ۱۳.۴۶ ± ۵.۱۷ MPa, respectively. The difference in the SBS of the two groups after thermocycling was
not significant (P = ۰.۷). The SBS of both groups decreased after thermocycling; however, the reduction
was lower in the group with TiO۲ than in the control group.
Conclusions: TiO۲-containing composite can be used as an antimicrobial agent in high risk of caries
patients without deteriorating the mechanical properties.
Keywords:
Authors
Melika Firouzmanesh
Department of Orthodontics, Dental research center, Dental school, Hamadan University of Medical Sciences, Hamadan, Iran
Abbas Farmany
Dental research center, Hamadan University of Medical Sciences, Hamadan, Iran
Maryam Farhadian
Department of Biostatistics, School of Public Health and Research Center for Health Sciences, Hamadan University of Medical Sciences, Hamadan, Iran
Vahid Mollabashi
Department of Orthodontics, Dental research center, Dental school, Hamadan University of Medical Sciences, Hamadan, Iran