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Open AccessArticle

Shear Bonding Strength and Thermal Cycling Effect of Fluoride Releasable/Rechargeable Orthodontic Adhesive Resins Containing LiAl-F Layered Double Hydroxide (LDH) Filler

1
School of Dentistry, College of Dentistry, China Medical University, Taichung 40402, Taiwan
2
Department of Materials Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan
3
Innovation and Development Center of Sustainable Agriculture (IDCSA), National Chung Hsing University, Taichung 40227, Taiwan
4
Department of Dental Hygiene, China Medical University, Taichung 40402, Taiwan
5
Biomaterials Translational Research Center, China Medical University Hospital, Taichung 40402, Taiwan
*
Author to whom correspondence should be addressed.
Equal contribution to corresponding author.
Materials 2019, 12(19), 3204; https://doi.org/10.3390/ma12193204
Received: 2 September 2019 / Revised: 25 September 2019 / Accepted: 27 September 2019 / Published: 30 September 2019
(This article belongs to the Special Issue Orthodontic Materials and Adhesive Interfaces)
This study aims to investigate the shear bonding strength (SBS) and thermal cycling effect of orthodontic brackets bonded with fluoride release/rechargeable LiAl-F layered double hydroxide (LDH-F) contained dental orthodontic resin. 3% and 5% of LDH-F nanopowder were gently mixed to commercial resin-based adhesives Orthomite LC (LC, LC3, LC5) and Transbond XT (XT, XT3). A fluoroaluminosilicate modified resin adhesive Transbond color change (TC) was selected as a positive control. Fifteen brackets each group were bonded to bovine enamel and the SBS was tested with/without thermal cycling. The adhesive remnant index (ARI) was evaluated at 20× magnification. The fluoride-releasing/rechargeability and cytocompatibility were also evaluated. The SBS of LC, LC3, and LC5 were significantly higher than XT and TC. After thermal cycling, the SBS of LC, LC3, and LC5 did not decrease and was significantly higher than TC. The changes of ARI scores indicate that failure occurred not only cohesive but also semi-cohesive fracture. The 30 days accumulated daily fluoride release of LC3, LC5, and TC without recharge are higher than 300 μg/cm2. The LDH-F contained resin adhesive possesses higher SBS compared to positive control TC. Fluoride release and the rechargeable feature can be achieved for preventing enamel demineralization without cytotoxicity. View Full-Text
Keywords: orthodontic adhesive resin; lithium aluminum (fluoride) layered double hydroxide; shear bond strength test; thermal cycling; fluoride release; cytotoxicity orthodontic adhesive resin; lithium aluminum (fluoride) layered double hydroxide; shear bond strength test; thermal cycling; fluoride release; cytotoxicity
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Hung, C.-Y.; Yu, J.-H.; Su, L.-W.; Uan, J.-Y.; Chen, Y.-C.; Lin, D.-J. Shear Bonding Strength and Thermal Cycling Effect of Fluoride Releasable/Rechargeable Orthodontic Adhesive Resins Containing LiAl-F Layered Double Hydroxide (LDH) Filler. Materials 2019, 12, 3204.

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