The Effect of MRI Exposure on the Shear Bond Strength and Adhesive Remnant Index of Different Bracket Types

Scientific paper - Original scientific paper

• Author: Luka Šimunović
• Author: Jakov Stojanović
• Author: Katarina Tečić
• Author: Dijana Zadravec
• Author: Senka Meštrović
• Author's institution: (Sestre milosrdnice University Hospital Center)
• Author's institution: (Zagreb University Hispital Center)
• Author's institution: University of Zagreb; School of Dental Medicine
• Scientific / art field, discipline and subdiscipline: BIOMEDICINE AND HEALTHCARE; Dental Medicine

Abstract (english)

Background/Objectives: Magnetic resonance imaging (MRI) is widely used in diagnostics, but its effects on orthodontic materials remain a concern. This study aimed to evaluate the impact of MRI exposure at 1.5 T and 3 T on the shear bond strength (SBS) and adhesive remnant index (ARI) of different orthodontic bracket types (metal, self-ligating, and ceramic). Methods: A total of 90 extracted human premolars were divided into three groups (control, 1.5 T, and 3 T MRI exposure). The three bracket types were bonded using Transbond XT adhesive and subjected to standardized polymerization. MRI scans were conducted using 1.5 T and 3 T machines with clinically relevant sequences. SBS was measured using a universal testing machine, and the ARI was assessed under a stereomicroscope. Statistical analysis was performed using Kruskal–Wallis and chi-square tests. Results: MRI exposure influenced SBS and the ARI differently across bracket types. Firstly, 3 T MRI exposure significantly reduced SBS in self-ligating (p = 0.017) and ceramic brackets (p = 0.014) compared to the control, whereas metal brackets showed no significant changes. ARI scores varied across MRI conditions, with metal and self-ligating brackets showing increased adhesive retention at higher field strengths. No significant differences were observed in ARI scores for ceramic brackets across MRI conditions. Conclusions: The clinical importance of understanding these results is that both patients and clinicians must be aware of inevitable changes that occur in SBS during MRI, since exposure to high-field MRI, particularly 3 T, may alter bond strength and adhesive failure characteristics.

• Keywords (english): shear bond strength; adhesive remnant index; orthodontic brackets; magnetic resonance imaging
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Dentistry Journal
• Numbering: vol. 13, no. 3, 108
• e-ISSN: 2304-6767
• DOI: https://doi.org/10.3390/dj13030108
• URN:NBN: urn:nbn:hr:127:337870
• Publication: 2025-02-28
• Document URL: https://www.mdpi.com/2304-6767/13/3/108
• Type of resource: Text
• Access conditions: Open access
• Created on: 2025-04-02 06:59:01