Use of Photoreactive Riboflavin and Blue Light Irradiation in Improving Dentin Bonding—Multifaceted Evaluation
Recently, photoactivated riboflavin (RF) treatments have been approved to improve resin–dentin bonding by enhancing dentinal collagen crosslinking. This study aimed to evaluate whether RF activated by blue light (BL, 450 nm) strengthens the collagen matrix, increases resistance to enzymatic degradat...
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2025-01-01
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| author | Ping-Ju Chen Jung-Pei Hsieh Hsiao-Tzu Chang Yuh-Ling Chen Shu-Fen Chuang |
| author_facet | Ping-Ju Chen Jung-Pei Hsieh Hsiao-Tzu Chang Yuh-Ling Chen Shu-Fen Chuang |
| author_sort | Ping-Ju Chen |
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| description | Recently, photoactivated riboflavin (RF) treatments have been approved to improve resin–dentin bonding by enhancing dentinal collagen crosslinking. This study aimed to evaluate whether RF activated by blue light (BL, 450 nm) strengthens the collagen matrix, increases resistance to enzymatic degradation, and improves adhesion as effectively as ultraviolet A (UVA, 375 nm) activation. Six groups were examined: control (no treatment); RF0.1UV2 (0.1% RF with 2 min of UVA irradiation); RF0.1BL1, RF0.1BL2, RF1BL1, and RF1BL2 (0.1% and 1% RF with 1 or 2 min of BL irradiation). The effects of RF/BL on collagen crosslinking were validated by gel electrophoresis. A nanoindentation test showed that both RF/UVA and RF/BL treatments enhanced the elastic modulus and nanohardness of demineralized dentin. A zymography assay using collagen extracted from demineralized dentin also revealed significant matrix metalloproteinase-2 inhibition across all RF treatments. Microtensile bond strength (µTBS) tests conducted both post-treatment and after 7-day enzymatic degradation showed that three RF0.1 groups (RF0.1UV2, RF0.1BL1, and RF0.1BL2) maintained high µTBS values after degradation, while RF0.1BL1 generated a significantly thicker hybrid layer compared to other groups. These findings suggest that RF/BL is as effective as RF/UVA in crosslinking dentinal collagen and resisting enzymatic degradation, with 0.1% RF proving superior to 1% RF in enhancing dentin bonding. |
| format | Article |
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| institution | Kabale University |
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| series | Journal of Functional Biomaterials |
| spelling | doaj-art-d782114cfed54f6c93890591243019372025-01-24T13:36:06ZengMDPI AGJournal of Functional Biomaterials2079-49832025-01-011611110.3390/jfb16010011Use of Photoreactive Riboflavin and Blue Light Irradiation in Improving Dentin Bonding—Multifaceted EvaluationPing-Ju Chen0Jung-Pei Hsieh1Hsiao-Tzu Chang2Yuh-Ling Chen3Shu-Fen Chuang4Department of Dentistry, Changhua Christian Hospital, Changhua 50006, TaiwanSchool of Dentistry and Institute of Oral Medicine, College of Medicine, National Cheng Kung University, Tainan 70101, TaiwanSchool of Dentistry and Institute of Oral Medicine, College of Medicine, National Cheng Kung University, Tainan 70101, TaiwanSchool of Dentistry and Institute of Oral Medicine, College of Medicine, National Cheng Kung University, Tainan 70101, TaiwanSchool of Dentistry and Institute of Oral Medicine, College of Medicine, National Cheng Kung University, Tainan 70101, TaiwanRecently, photoactivated riboflavin (RF) treatments have been approved to improve resin–dentin bonding by enhancing dentinal collagen crosslinking. This study aimed to evaluate whether RF activated by blue light (BL, 450 nm) strengthens the collagen matrix, increases resistance to enzymatic degradation, and improves adhesion as effectively as ultraviolet A (UVA, 375 nm) activation. Six groups were examined: control (no treatment); RF0.1UV2 (0.1% RF with 2 min of UVA irradiation); RF0.1BL1, RF0.1BL2, RF1BL1, and RF1BL2 (0.1% and 1% RF with 1 or 2 min of BL irradiation). The effects of RF/BL on collagen crosslinking were validated by gel electrophoresis. A nanoindentation test showed that both RF/UVA and RF/BL treatments enhanced the elastic modulus and nanohardness of demineralized dentin. A zymography assay using collagen extracted from demineralized dentin also revealed significant matrix metalloproteinase-2 inhibition across all RF treatments. Microtensile bond strength (µTBS) tests conducted both post-treatment and after 7-day enzymatic degradation showed that three RF0.1 groups (RF0.1UV2, RF0.1BL1, and RF0.1BL2) maintained high µTBS values after degradation, while RF0.1BL1 generated a significantly thicker hybrid layer compared to other groups. These findings suggest that RF/BL is as effective as RF/UVA in crosslinking dentinal collagen and resisting enzymatic degradation, with 0.1% RF proving superior to 1% RF in enhancing dentin bonding.https://www.mdpi.com/2079-4983/16/1/11riboflavindentin bondingcollagen crosslinkingenzymatic degradationnanoindentationmicrotensile bond strength |
| spellingShingle | Ping-Ju Chen Jung-Pei Hsieh Hsiao-Tzu Chang Yuh-Ling Chen Shu-Fen Chuang Use of Photoreactive Riboflavin and Blue Light Irradiation in Improving Dentin Bonding—Multifaceted Evaluation Journal of Functional Biomaterials riboflavin dentin bonding collagen crosslinking enzymatic degradation nanoindentation microtensile bond strength |
| title | Use of Photoreactive Riboflavin and Blue Light Irradiation in Improving Dentin Bonding—Multifaceted Evaluation |
| title_full | Use of Photoreactive Riboflavin and Blue Light Irradiation in Improving Dentin Bonding—Multifaceted Evaluation |
| title_fullStr | Use of Photoreactive Riboflavin and Blue Light Irradiation in Improving Dentin Bonding—Multifaceted Evaluation |
| title_full_unstemmed | Use of Photoreactive Riboflavin and Blue Light Irradiation in Improving Dentin Bonding—Multifaceted Evaluation |
| title_short | Use of Photoreactive Riboflavin and Blue Light Irradiation in Improving Dentin Bonding—Multifaceted Evaluation |
| title_sort | use of photoreactive riboflavin and blue light irradiation in improving dentin bonding multifaceted evaluation |
| topic | riboflavin dentin bonding collagen crosslinking enzymatic degradation nanoindentation microtensile bond strength |
| url | https://www.mdpi.com/2079-4983/16/1/11 |
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