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Fan S, Yu H, Guan Z, Lv F, Zhou Z, Dai C. Diagnosis of dental caries based on attenuation coefficients analysis of optical coherence tomography images. JOURNAL OF BIOPHOTONICS 2024; 17:e202400031. [PMID: 38877707 DOI: 10.1002/jbio.202400031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 04/29/2024] [Accepted: 04/30/2024] [Indexed: 06/16/2024]
Abstract
Quantitative analysis of optical attenuation based on optical coherence tomography images will offer an effective method to enhance diagnostic capabilities. In this paper, the optical attenuation in demineralized caries specimens was calculated to distinguish between normal teeth and carious teeth and further to differentiate the severity of caries, and thus come to the half-automated diagnosis of dental caries. Results show that the attenuation coefficient in carious regions is approximately 4.97 mm - 1 ± 0.206 , while that of normal teeth is about 3.69 mm - 1 ± 0.231 . Attenuation coefficient of carious regions is 35% higher than that of normal teeth. Moreover, five classes of caries were qualified and classified based on the optical attenuation coefficient. Compared with the healthy teeth, there is a noticeable disparity in the attenuation coefficients of carious teeth, both on the surface and at the dentinoenamel junction. This study provides a method for accurate caries diagnosis, particularly in detection of early lesions and subtle structural changes.
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Affiliation(s)
- Shuhao Fan
- Shanghai Institute of Technology, College of Sciences, Shanghai, China
| | - Huanhuan Yu
- Shanghai Institute of Technology, College of Sciences, Shanghai, China
| | - Zehua Guan
- Shanghai Institute of Technology, College of Sciences, Shanghai, China
| | - Fukang Lv
- Shanghai Institute of Technology, College of Sciences, Shanghai, China
| | - Zhuojun Zhou
- Department of General Dentistry, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, Shanghai Research Institute of Stomatology, Shanghai, China
| | - Cuixia Dai
- Shanghai Institute of Technology, College of Sciences, Shanghai, China
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2
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Hund SMM, Golde J, Tetschke F, Basche S, Meier M, Kirsten L, Koch E, Hannig C, Walther J. Polarization-Sensitive Optical Coherence Tomography for Monitoring De- and Remineralization of Bovine Enamel In Vitro. Diagnostics (Basel) 2024; 14:367. [PMID: 38396406 PMCID: PMC10888132 DOI: 10.3390/diagnostics14040367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Revised: 01/25/2024] [Accepted: 02/05/2024] [Indexed: 02/25/2024] Open
Abstract
Early caries diagnosis still challenges dentistry. Polarization-sensitive optical coherence tomography (PS-OCT) is promising to detect initial lesions non-invasively in depth-resolved cross-sectional visualization. PS-OCT with determined degree of polarization (DOP) imaging provides an intuitive demineralization contrast. The aim of this study is to evaluate the suitability of DOP-based PS-OCT imaging to monitor controlled de- and remineralization progression for the first time and to introduce it as a valid, non-destructive in vitro detection method. Twelve standardized bovine enamel specimens were divided in different groups and demineralized with hydrochloric acid (HCl) as well as partly remineralized with fluoride over a 14-day pH-cycling experiment. The specimens were stored in artificial saliva and sodium chloride (NaCl), respectively. Progress measurements with PS-OCT were made with polarization-sensitive en faceand B-scan mode for qualitative evaluation. The specimens demineralized in HCl showed the most pronounced surface change (lowest DOP) and the most significant increase in depolarization. Additional fluoride treatment and the storage in artificial saliva resulted in the opposite (highest DOP). Therefore, DOP-based PS-OCT imaging appears to be a valuable technique for visualization and monitoring of enamel demineralization and remineralization processes in vitro. However, these findings need to be confirmed in human teeth ex vivo or in situ.
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Affiliation(s)
- Stella M M Hund
- Department of Medical Physics and Biomedical Engineering, Faculty Carl Gustav Carus of Medicine, TU Dresden, Fetscherstraße 74, 01307 Dresden, Germany
- Polyclinic of Operative Dentistry, Periodontology and Pediatric Dentistry, Faculty of Medicine Carl Gustav Carus, TU Dresden, Fetscherstraße 74, 01307 Dresden, Germany
| | - Jonas Golde
- Department of Medical Physics and Biomedical Engineering, Faculty Carl Gustav Carus of Medicine, TU Dresden, Fetscherstraße 74, 01307 Dresden, Germany
- Clinical Sensoring and Monitoring, Department of Anesthesiology and Intensive Care Medicine, Faculty of Medicine Carl Gustav Carus, TU Dresden, Fetscherstraße 74, 01307 Dresden, Germany
| | - Florian Tetschke
- Polyclinic of Operative Dentistry, Periodontology and Pediatric Dentistry, Faculty of Medicine Carl Gustav Carus, TU Dresden, Fetscherstraße 74, 01307 Dresden, Germany
- Clinical Sensoring and Monitoring, Department of Anesthesiology and Intensive Care Medicine, Faculty of Medicine Carl Gustav Carus, TU Dresden, Fetscherstraße 74, 01307 Dresden, Germany
| | - Sabine Basche
- Polyclinic of Operative Dentistry, Periodontology and Pediatric Dentistry, Faculty of Medicine Carl Gustav Carus, TU Dresden, Fetscherstraße 74, 01307 Dresden, Germany
| | - Melina Meier
- Polyclinic of Operative Dentistry, Periodontology and Pediatric Dentistry, Faculty of Medicine Carl Gustav Carus, TU Dresden, Fetscherstraße 74, 01307 Dresden, Germany
| | - Lars Kirsten
- Department of Medical Physics and Biomedical Engineering, Faculty Carl Gustav Carus of Medicine, TU Dresden, Fetscherstraße 74, 01307 Dresden, Germany
| | - Edmund Koch
- Clinical Sensoring and Monitoring, Department of Anesthesiology and Intensive Care Medicine, Faculty of Medicine Carl Gustav Carus, TU Dresden, Fetscherstraße 74, 01307 Dresden, Germany
| | - Christian Hannig
- Polyclinic of Operative Dentistry, Periodontology and Pediatric Dentistry, Faculty of Medicine Carl Gustav Carus, TU Dresden, Fetscherstraße 74, 01307 Dresden, Germany
| | - Julia Walther
- Department of Medical Physics and Biomedical Engineering, Faculty Carl Gustav Carus of Medicine, TU Dresden, Fetscherstraße 74, 01307 Dresden, Germany
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Alves LVGL, da Silva MBF, Borsatto MC, Corona SAM. Do erbium lasers promote changes in the tooth enamel during debonding of ceramic laminate veneers? A systematic review. Lasers Med Sci 2023; 38:217. [PMID: 37735282 DOI: 10.1007/s10103-023-03882-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Accepted: 09/13/2023] [Indexed: 09/23/2023]
Abstract
The longevity of ceramic laminate veneers can be influenced by several factors, which can result in the need for a removal process. Laser removal has emerged as a good alternative to facilitate the procedure, and its repercussions on tooth enamel have been investigated. We aimed to evaluate the efficacy of erbium lasers for debonding ceramic laminate veneers without damaging the tooth enamel. This systematic review based on the PICOS model adhered to the PRISMA statement. The PubMed/MEDLINE, Web of Science, Embase, and Scopus databases were systematically searched until December 1, 2022, and 2902 studies were retrieved. After screening, four in vitro studies that analyzed the dental morphology using scanning electron microscopy, optical analysis, stereomicroscopy, or x-ray dispersion spectroscopy were included. The risk of bias was assessed using the Cochrane Collaboration tool. Our findings suggest that erbium lasers are useful for ceramic laminate veneer removal without damaging the tooth enamel. However, the removal is influenced by the type and thickness of ceramic and type of cement used. It could be concluded that the application of Erbium laser did not promote superficial changes in the dental enamel. This effect was observed in all analysis performed.
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Affiliation(s)
- Luísa Valente Gotardo Lara Alves
- Department of Restorative Dentistry, Ribeirão Preto School of Dentistry, University of São Paulo, Brazil, Avenida do Café - Subsetor Oeste - 11 (N-11), Ribeirão Preto -, São Paulo, 14040-904, Brazil.
| | - Marcelle Beathriz Fernandes da Silva
- Departament of Oral Biology, Ribeirão Preto School of Dentistry, University of São Paulo, Brazil. Avenida do Café - Subsetor Oeste - 11 (N-11), Ribeirão Preto -, São Paulo, 14040-904, Brazil
| | - Maria Cristina Borsatto
- Department of Pediatric Dentistry, Ribeirão Preto School of Dentistry, University of São Paulo, Brazil, Avenida do Café - Subsetor Oeste - 11 (N-11), Ribeirão Preto -, São Paulo, 14040-904, Brazil
| | - Silmara Aparecida Milori Corona
- Department of Restorative Dentistry, Ribeirão Preto School of Dentistry, University of São Paulo, Brazil, Avenida do Café - Subsetor Oeste - 11 (N-11), Ribeirão Preto -, São Paulo, 14040-904, Brazil
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Saberi FNM, Liew YM, Sukumaran P, Ung NM. Ex-vivo analysis of demineralisation on irradiated teeth using optical coherence tomography. Photodiagnosis Photodyn Ther 2023; 43:103715. [PMID: 37481146 DOI: 10.1016/j.pdpdt.2023.103715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 07/16/2023] [Accepted: 07/17/2023] [Indexed: 07/24/2023]
Abstract
Head and neck cancer patients are prone to dental caries after radiotherapy. An ex-vivo study was conducted to assess the feasibility of optical coherence tomography (OCT) to detect tooth demineralization due to caries in irradiated teeth. Thirty-nine human molar teeth were subjected to caries lesion induction through irradiation (Group 1), pH cycling (Group 2-1), and both (Group 2-2). The OCT signal attenuation coefficient, µR was assessed and validated against microhardness test and scanning electron microscope (SEM). The µR for Group 1 increased from 10 Gy to 40 Gy, and subsequently decreased after irradiated to 50 Gy and 60 Gy due to damaged enamel microstructure. In Group 2-1, the µR decreased with duration of pH cycling from day 1 to day 14 due to the increase of porosity in enamel layer. However, the µR showed decreasing trend from day 14 to day 28 of pH cycling, resulted from mineral deposition in the enamel layer. Although no significant difference was found in the µR between Group 2-1 and 2-2, SEM of Group 2-2 demonstrated visually higher porosity and larger gaps between microstructures. Irradiation may accelerate caries damage to tooth microstructure by increasing its porosity and brittleness, but larger sample size may be needed to further prove the effect. OCT could potentially be used for early detection of tooth demineralization in vivo based on the measurable µR changes for all groups which are shown negatively correlated with microhardness value (p < 0.05).
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Affiliation(s)
| | - Yih Miin Liew
- Department of Biomedical Engineering, Faculty of Engineering, Universiti Malaya, Kuala Lumpur, Malaysia.
| | - Prema Sukumaran
- Faculty of Dentistry, Oral & Craniofacial Sciences, King's College London, London, United Kingdom.
| | - Ngie Min Ung
- Clinical Oncology Unit, Faculty of Medicine, Universiti Malaya, Kuala Lumpur, Malaysia
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Liu Z, Sun T, Chen Y, Mo X, Kao H, Chen HJ. Integrated Multiplex Sensing Clear Aligner for In Situ Monitoring of Dental Enamel Demineralization. ACS Biomater Sci Eng 2023. [PMID: 37115517 DOI: 10.1021/acsbiomaterials.3c00029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
Clear aligners have become one of the most important tools in orthodontic treatment. However, over a lengthy period of orthodontic treatment, enamel demineralization or even dental caries could be susceptible for occurrence. Therefore, early diagnosis of enamel demineralization has been widely investigated. Nevertheless, for reasons including bulky monitoring equipment and complexity of operation, few techniques reported to date possessed clinical utility. The combination of flexible electronics and electrochemical sensing technology presented a promising strategy. Herein, an integrated multiplex sensing clear aligner (IMSCA) system, including a clear aligner with a multiplex sensor array patch, was developed for in situ monitoring of Ca2+, pH, and PO43- in the oral environment to provide a foundation for early diagnosis of enamel demineralization. The IMSCA exhibited a broad linear response range, great selectivity, temporal stability, reproducibility, and biological safety. Results of enamel demineralization simulating experiments and human permanent tooth demineralization experiments validate the capability of the IMSCA to indicate the occurrence of enamel demineralization. All results ultimately point to the promising clinical utility of the IMSCA, which facilitates the quantitative characterization of enamel demineralization in complex oral environments. This study provides a novel strategy in the early diagnosis of enamel demineralization.
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Affiliation(s)
- Ziqi Liu
- School of Electronics and Information Technology, State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University, Guangzhou 510006, China
| | - Tiancheng Sun
- School of Electronics and Information Technology, State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University, Guangzhou 510006, China
| | - Yiyin Chen
- Department of Orthodontics, State Key Laboratory of Oral Diseases & National Clinical Center for Oral Research, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Xiaoyi Mo
- Division of Spine Surgery, Department of Orthopedics, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Hsiaohan Kao
- Xiamen Chang Gung Hospital, Xiamen 361021, China
| | - Hui-Jiuan Chen
- School of Electronics and Information Technology, State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University, Guangzhou 510006, China
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Tay N, Gan H, de Sousa FB, Shen L, Nóbrega DF, Peng C, Kilpatrick-Liverman L, Wang W, Lavender S, Pilch S, Han J. Improved mineralization of dental enamel by electrokinetic delivery of F - and Ca 2+ ions. Sci Rep 2023; 13:516. [PMID: 36627315 PMCID: PMC9832158 DOI: 10.1038/s41598-022-26423-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Accepted: 12/14/2022] [Indexed: 01/12/2023] Open
Abstract
This in vitro study evaluated the effects of the infiltration of F- and Ca2+ ions into human enamel by electrokinetic flow (EKF) on the enamel microhardness and F- content. Sound human enamel ground sections of unerupted third molars were infiltrated with de-ionized water by EKF and with F- ion by EKF respectively. All samples were submitted to two successive transverse acid-etch biopsies (etching times of 30 s and 20 min) to quantify F- ion infiltrated deep into enamel. Remarkably, sound enamel showed a large increase in microhardness (MH) after infiltration of NaF (p < 0.00001) and CaCl2 (p = 0.013) by EKF. Additionally, NaF-EKF increased the remineralization in the lesion body of artificial enamel caries lesions compared to controls (p < 0.01). With the enamel biopsy technique, at both etching times, more F- ions were found in the EKF-treated group than the control group (p << 0.05), and more fluoride was extracted from deeper biopsies in the NaF-EKF group. In conclusion, our results show that EKF treatment is superior in transporting Ca2+ and F- ions into sound enamel when compared to molecular diffusion, enhancing both the mineralization of sound enamel and the remineralization of artificial enamel caries.
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Affiliation(s)
- NamBeng Tay
- grid.486188.b0000 0004 1790 4399Engineering Cluster, Singapore Institute of Technology, 10 Dover Drive, Singapore, 138683 Singapore
| | - HiongYap Gan
- Engineering Cluster, Singapore Institute of Technology, 10 Dover Drive, Singapore, 138683, Singapore.
| | - Frederico Barbosa de Sousa
- grid.411216.10000 0004 0397 5145Department of Morphology and Graduate Program in Dentistry, Health Sciences Center, Federal University of Paraiba, Joao Pessoa, Cidade Universitaria, Paraíba, Brazil
| | - Lu Shen
- grid.486188.b0000 0004 1790 4399Engineering Cluster, Singapore Institute of Technology, 10 Dover Drive, Singapore, 138683 Singapore
| | | | - Chenhui Peng
- grid.56061.340000 0000 9560 654XDepartment of Physics and Materials Science, University of Memphis, Memphis, TN USA
| | | | - Wei Wang
- grid.418753.c0000 0004 4685 452XColgate-Palmolive Technology Center, Piscataway, NJ USA
| | - Stacey Lavender
- grid.418753.c0000 0004 4685 452XColgate-Palmolive Technology Center, Piscataway, NJ USA
| | - Shira Pilch
- grid.418753.c0000 0004 4685 452XColgate-Palmolive Technology Center, Piscataway, NJ USA
| | - Jongyoon Han
- Department of Electric Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, USA. .,Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
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Mohamad Saberi FN, Sukumaran P, Ung NM, Liew YM. Assessment of demineralized tooth lesions using optical coherence tomography and other state-of-the-art technologies: a review. Biomed Eng Online 2022; 21:83. [PMID: 36463182 PMCID: PMC9719651 DOI: 10.1186/s12938-022-01055-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Accepted: 11/22/2022] [Indexed: 12/05/2022] Open
Abstract
Tooth demineralization is one of the most common intraoral diseases, encompassing (1) caries caused by acid-producing bacteria and (2) erosion induced by acid of non-bacterial origin from intrinsic sources (e.g. stomach acid reflux) and extrinsic sources (e.g. carbonated drinks). Current clinical assessment based on visual-tactile examination and standardized scoring systems is insufficient for early detection. A combination of clinical examination and technology is therefore increasingly adapted. This paper reviews various procedures and technologies that have been invented to diagnose and assess the severity of tooth demineralization, with focus on optical coherence tomography (OCT). As a micron-resolution non-invasive 3D imaging modality, variants of OCT are now available, offering many advantages under different working principles for detailed analytical assessment of tooth demineralization. The roles, capabilities and impact of OCT against other state-of-the-art technologies in both clinical and research settings are described. (139 words).
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Affiliation(s)
- Fatin Najwa Mohamad Saberi
- grid.10347.310000 0001 2308 5949Department of Biomedical Engineering, Faculty of Engineering, Universiti Malaya, Kuala Lumpur, Malaysia
| | - Prema Sukumaran
- grid.13097.3c0000 0001 2322 6764Faculty of Dentistry, Oral & Craniofacial Sciences, King’s College London, London, England
| | - Ngie Min Ung
- grid.10347.310000 0001 2308 5949Clinical Oncology Unit, Faculty of Medicine, Universiti Malaya, Kuala Lumpur, Malaysia
| | - Yih Miin Liew
- grid.10347.310000 0001 2308 5949Department of Biomedical Engineering, Faculty of Engineering, Universiti Malaya, Kuala Lumpur, Malaysia
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Monoketonic Curcuminoid-Lidocaine Co-Deliver Using Thermosensitive Organogels: From Drug Synthesis to Epidermis Structural Studies. Pharmaceutics 2022; 14:pharmaceutics14020293. [PMID: 35214026 PMCID: PMC8879257 DOI: 10.3390/pharmaceutics14020293] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 01/23/2022] [Accepted: 01/25/2022] [Indexed: 02/04/2023] Open
Abstract
Organogels (ORGs) are remarkable matrices due to their versatile chemical composition and straightforward preparation. This study proposes the development of ORGs as dual drug-carrier systems, considering the application of synthetic monoketonic curcuminoid (m-CUR) and lidocaine (LDC) to treat topical inflammatory lesions. The monoketone curcuminoid (m-CUR) was synthesized by using an innovative method via a NbCl5–acid catalysis. ORGs were prepared by associating an aqueous phase composed of Pluronic F127 and LDC hydrochloride with an organic phase comprising isopropyl myristate (IPM), soy lecithin (LEC), and the synthesized m-CUR. Physicochemical characterization was performed to evaluate the influence of the organic phase on the ORGs supramolecular organization, permeation profiles, cytotoxicity, and epidermis structural characteristics. The physico-chemical properties of the ORGs were shown to be strongly dependent on the oil phase constitution. Results revealed that the incorporation of LEC and m-CUR shifted the sol-gel transition temperature, and that the addition of LDC enhanced the rheological G′/G″ ratio to higher values compared to original ORGs. Consequently, highly structured gels lead to gradual and controlled LDC permeation profiles from the ORG formulations. Porcine ear skin epidermis was treated with ORGs and evaluated by infrared spectroscopy (FTIR), where the stratum corneum lipids were shown to transition from a hexagonal to a liquid crystal phase. Quantitative optical coherence tomography (OCT) analysis revealed that LEC and m-CUR additives modify skin structuring. Data from this study pointed ORGs as promising formulations for skin-delivery.
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Liu J, Yang HL, Sun XW, Zhang YM, Yao H, Wei TB, Lin Q. A simple pillar[5]arene assembled multi-functional material with ultrasensitive sensing, self-healing, conductivity and host-guest stimuli-responsive properties. SOFT MATTER 2021; 17:8308-8313. [PMID: 34550160 DOI: 10.1039/d1sm01001h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Multi-functional materials have received wide attention due to their potential applications in various fields; therefore, developing a simple and easy strategy for the preparation of multi-functional materials is an interesting issue. In this work, a novel supramolecular gel, TP-QG, has been successfully constructed via the assembly of a simple methoxyl-pillar[5]arene host (TP) and a tripodal (tri-pyridine-4-yl)-amido-benzene guest (Q). Interestingly, TP-QG could act as a multi-functional material and showed strong fluorescence, good self-healing, host-guest stimuli-responsiveness and conductive properties. Due to these properties, TP-QG shows a fascinating application prospect. For instance, TP-QG could exhibit ultrasensitive fluorescence response for Fe3+ and F- in water via the fluorescence "ON-OFF-ON" pathway; the lowest detection limit (LOD) of TP-QG for Fe3+ was 2.32 × 10-10 M and the LOD of TP-QG-Fe for F- was 4.30 × 10-8 M. These properties permit TP-QG to act as not only a Fe3+ and F- sensor, but also an "ON-OFF-ON" fluorescence display material and an efficient logic gate. Meanwhile, the xerogel of TP-QG could remove Fe3+ from water, and the adsorption ratio was 98.68%; the xerogel of TP-QG-Fe could also remove F- from water; the removal ratio was about 87.92%. This work provides a feasible way to construct multi-functional smart materials by host-guest assembly.
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Affiliation(s)
- Juan Liu
- College of Chemical Engineering, Key Laboratory for Utility of Environment-Friendly Composite Materials and Biomass in University of Gansu Province, Northwest Minzu University (Northwest University for Nationalities), Lanzhou, 730070, China.
| | - Hai-Long Yang
- Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, Key Laboratory of Eco-environmental Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China.
| | - Xiao-Wen Sun
- Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, Key Laboratory of Eco-environmental Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China.
| | - You-Ming Zhang
- Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, Key Laboratory of Eco-environmental Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China.
| | - Hong Yao
- Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, Key Laboratory of Eco-environmental Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China.
| | - Tai-Bao Wei
- Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, Key Laboratory of Eco-environmental Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China.
| | - Qi Lin
- Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, Key Laboratory of Eco-environmental Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China.
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Dias-Moraes MC, Castro PAA, Pereira DL, Ana PA, Freitas AZ, Zezell DM. Assessment of the preventive effects of Nd:YAG laser associated with fluoride on enamel caries using optical coherence tomography and FTIR spectroscopy. PLoS One 2021; 16:e0254217. [PMID: 34234361 PMCID: PMC8263272 DOI: 10.1371/journal.pone.0254217] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 06/22/2021] [Indexed: 02/06/2023] Open
Abstract
Objective This in vitro study characterized and monitored, by Optical Coherence Tomography (OCT) and Fourier Transformed Infrared Spectroscopy (FTIR), the effects of the association of acidulated phosphate fluoride gel (APF-gel) and Nd:YAG (neodymiun:yttrium-aluminum-garnet) laser, as sequencial treatments, in the prevention of incipient enamel caries lesions. Methods 120 human enamel samples were randomized into 3 groups (n = 40): APF-gel (1.23% F-, 4 min.); Laser+APF (Nd:YAG laser irradiation—0.6W, 84.9J/cm2, 10Hz, followed by APF-gel); and APF+Laser (APF-gel followed by laser irradiation). The samples were subjected to a 15-day pH-cycling, evaluated by OCT (quantification of optical attenuation coefficient–OAC) and FTIR (analysis of carbonate and phosphate content) before treatments, after treatments, and on the 5th, 10th and 15th days of pH-cycling. The statistical analysis was performed (α = 5%). Results The Optical Attenuation Coefficient (OAC) assessed by OCT increases with the progression of demineralization, and the Laser+APF presented the highest values of OAC in 10th and 15th days of pH-cycling. Nd:YAG decreased the carbonate content after treatment regardless of the application order of the APF-gel, while APF-gel did not interfere in the composition of enamel. The carbonate content was also changed in the first 5 days of the pH-cycling in all groups. Conclusion Nd:YAG laser irradiation before or after the application of APF-gel did not influence the appearance of incipient caries lesions, showing no synergistic effect. Regardless of the application order of the APF-gel, laser irradiation reduces the carbonate content of the enamel, which also changes during the demineralization process. However, irradiation before the application of APF-gel increased the speed of progression of the lesions, which positively impacts public health as it can prevent caries disease, even in high risk individuals. OCT and FTIR are suitable for assessing this effect.
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Affiliation(s)
- Marcia Cristina Dias-Moraes
- Center for Lasers and Applications, Instituto de Pesquisas Energeticas e Nucleares, IPEN—CNEN/SP, Sao Paulo, SP, Brazil
| | - Pedro Arthur Augusto Castro
- Center for Lasers and Applications, Instituto de Pesquisas Energeticas e Nucleares, IPEN—CNEN/SP, Sao Paulo, SP, Brazil
| | - Daísa Lima Pereira
- Center for Lasers and Applications, Instituto de Pesquisas Energeticas e Nucleares, IPEN—CNEN/SP, Sao Paulo, SP, Brazil
| | - Patrícia Aparecida Ana
- Center for Engineering, Modelling and Applied Social Sciences, Universidade Federal do ABC, Sao Bernardo do Campo, SP, Brazil
| | - Anderson Zanardi Freitas
- Center for Lasers and Applications, Instituto de Pesquisas Energeticas e Nucleares, IPEN—CNEN/SP, Sao Paulo, SP, Brazil
| | - Denise Maria Zezell
- Center for Lasers and Applications, Instituto de Pesquisas Energeticas e Nucleares, IPEN—CNEN/SP, Sao Paulo, SP, Brazil
- * E-mail:
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11
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Rodrigues RV, Sampaio CS, Girotto AC, Pinhatti CP, Iwamoto AS, de Freitas AZ, Ambrosano GMB, Puppin-Rontani RM, Pascon FM. Analysis of enamel/restoration interface submitted cariogenic challenge and fluoride release. Microsc Res Tech 2021; 84:2857-2866. [PMID: 34048111 DOI: 10.1002/jemt.23844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 04/23/2021] [Accepted: 05/14/2021] [Indexed: 11/07/2022]
Abstract
The treatment of high-risk patients still is a challenge. The understanding and development non-invasive, non-destructive, and non-ionizing techniques, can help to guide the treatment and the diagnosis of primary and recurrent caries. The present study evaluated the behavior of enamel/restoration interface after a cariogenic challenge by Fourier domain optical coherence tomography (FD-OCT), scanning electron microscopy (SEM) examination, and the fluoride release of the different restorative materials. Cavities (1.5 × 0.5 mm) were performed in enamel surface and divided into groups (n = 8): glass ionomer cement (GIC), resin-modified glass ionomer cement (RMGIC), and resin composite (RC). The samples were submitted to pH-cycling, and the solutions analyzed for cumulative fluoride by ion-analyzer. The morphology was analyzed by SEM through replicas. The optical attenuation coefficient (OAC) was calculated through exponential decay from the images generated by FD-OCT. Data were analyzed considering α = 0.05. OAC values increased for all groups after pH-cycling indicating demineralization (p < .05). Considering the remineralizing solution, RMGIC presented higher fluoride release rate, followed by GIC, while RC did not release any fluoride. Yet for the demineralizing solution, RMGIC and GIC released similar fluoride rates, overcoming RC (p < .05). Micrographs revealed no changes on the restorations margins, although enamel detachment was observed for RC and GIC after pH-cycling.
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Affiliation(s)
- Raquel Viana Rodrigues
- Department of Restorative Dentistry, Piracicaba Dental School, UNICAMP, Piracicaba, Brazil.,Department of Oral Health Sciences, UBC Faculty of Dentistry, Vancouver, Canada
| | - Camila Sobral Sampaio
- Department of Restorative Dentistry, Piracicaba Dental School, UNICAMP, Piracicaba, Brazil.,Department of Biomaterials, Universidad de Los Andes, Santiago, Chile
| | - Aline Carvalho Girotto
- Department of Restorative Dentistry, Piracicaba Dental School, UNICAMP, Piracicaba, Brazil
| | - Caroline Paiuta Pinhatti
- Department of Health Sciences and Pediatric Dentistry, Piracicaba Dental School, UNICAMP, Piracicaba, Brazil
| | - Alexsandra Shizue Iwamoto
- Department of Health Sciences and Pediatric Dentistry, Piracicaba Dental School, UNICAMP, Piracicaba, Brazil
| | | | | | - Regina Maria Puppin-Rontani
- Department of Health Sciences and Pediatric Dentistry, Piracicaba Dental School, UNICAMP, Piracicaba, Brazil
| | - Fernanda Miori Pascon
- Department of Health Sciences and Pediatric Dentistry, Piracicaba Dental School, UNICAMP, Piracicaba, Brazil
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12
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Yavuz BS, Kargul B. Comparative evaluation of the spectral-domain optical coherence tomography and microhardness for remineralization of enamel caries lesions. Dent Mater J 2021; 40:1115-1121. [PMID: 33980748 DOI: 10.4012/dmj.2020-279] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This study aimed to evaluate the Cirrus high-definition (HD) spectral-domain optical coherence tomography (SD-OCT) for the remineralization of artificial enamel caries and to compare it with the comparison surface microhardness (SMH) analysis. Artificial caries lesions were produced on forty human enamel samples. Then, three different remineralization agents containing casein phosphopeptide amorphous calcium phosphate; casein phosphopeptide amorphous calcium fluoride phosphate; calcium glycerophosphate, magnesium chloride, and xylitol; and remineralization solution (control) were applied with pH cycling for six days. The optical depth of backscattered light and microhardness of enamel were measured using SD-OCT and SMH. All remineralization agents were significantly efficient in reducing optical lesion depth on enamels (p1=0.001, p2=0.002, p3=0.006, p4=0.025), and in increasing the SMH of enamels (p1-3=0.005, p4=0.017). However, the optical lesion depths of the enamel showed no correlation with the SMH in the groups. In conclusion, demineralization and remineralization of artificial lesions can be assessed with both SD-OCT and SMH.
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Affiliation(s)
- Betul Sen Yavuz
- Department of Pediatric Dentistry, School of Dental Medicine, Bahcesehir University
| | - Betul Kargul
- Department of Pediatric Dentistry, School of Dentistry, Marmara University
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13
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Zanini NA, Rabelo TF, Zamataro CB, Caramel-Juvino A, Ana PA, Zezell DM. Morphological, optical, and elemental analysis of dental enamel after debonding laminate veneer with Er,Cr:YSGG laser: A pilot study. Microsc Res Tech 2020; 84:489-498. [PMID: 32978851 DOI: 10.1002/jemt.23605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 08/17/2020] [Accepted: 09/05/2020] [Indexed: 11/11/2022]
Abstract
Laminate veneer removal is becoming a routine procedure at the dental clinic and the use of laser can facilitate its removal. This work aimed to evaluate the morphological, elemental, and optical changes in the remaining enamel after veneer removal using Er,Cr:YSGG laser. Forty-four enamel slabs were prepared and randomly distributed into nine experimental groups, for bonding using lithium disilicate laminates with three different luting agents (Variolink Veneer, RelyX U200, and RelyX Veneer). Then each agent was debonded using Er,Cr:YSGG laser (2.78 μm) using two different protocols:3.5 W, 48.14 J/cm2 , 20 Hz non-contact and 3.0 W, 48.14 J/cm2 , 20 Hz non-contact. The morphological, optical, and elemental analysis of enamel was performed before cementation and after laser debonding, using scanning electron microscopy (SEM), optical coherence tomography (OCT), and energy-dispersive X-ray spectroscopy (EDS). The level of statistical significance adopted was 5%. The EDS analysis of enamel after debonding revealed a significant increase in silane and carbon, as well as a decrease in calcium and phosphate contents. Analysis showed the presence of residual cement in most experimental groups but the morphological analysis showed alteration of the enamel's prisms only in the groups that used RelyX Veneer and Variolink Veneer cements. There was no evidence of deleterious morphological changes resulting from irradiation. However, an increase in the optical attenuation coefficient by the OCT was observed due to the presence of the remaining cement. It can be concluded that the Er,Cr:YSGG laser, in the mean powers used, is efficient for veneer removal without causing deleterious effects for the enamel.
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Affiliation(s)
- Nathalia A Zanini
- Nuclear and Energy Research Institute (IPEN-CNEN/SP), Center for Lasers and Applications, São Paulo, SP, Brazil
| | - Thais F Rabelo
- Nuclear and Energy Research Institute (IPEN-CNEN/SP), Center for Lasers and Applications, São Paulo, SP, Brazil
| | - Claudia B Zamataro
- Nuclear and Energy Research Institute (IPEN-CNEN/SP), Center for Lasers and Applications, São Paulo, SP, Brazil
| | - Amanda Caramel-Juvino
- Nuclear and Energy Research Institute (IPEN-CNEN/SP), Center for Lasers and Applications, São Paulo, SP, Brazil
| | - Patrícia A Ana
- Federal University of ABC (UFABC), Center for Engineering, Modelling and Applied Social Sciences (CECS), São Bernardo do Campo, SP, Brazil
| | - Denise M Zezell
- Nuclear and Energy Research Institute (IPEN-CNEN/SP), Center for Lasers and Applications, São Paulo, SP, Brazil
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14
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Lopes MS, Pereira DL, de Oliveira Mota CCB, Amaral MM, Zezell DM, Gomes ASL. The lingual enamel morphology and bracket shear bond strength influenced by Nd:YAG laser and aluminum oxide sandblasting preconditioning. Clin Oral Investig 2020; 25:1151-1158. [PMID: 32607827 DOI: 10.1007/s00784-020-03418-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Accepted: 06/16/2020] [Indexed: 11/27/2022]
Abstract
OBJECTIVES This study aimed to investigate the influence of Nd:YAG laser and aluminum oxide sandblasting on the shear bond strength (SBS) of lingual brackets and to optically analyze the behavior of the enamel morphology. MATERIALS AND METHODS Thirty-five bovines' incisors teeth were divided into 5 groups (n = 7), according to the surface preconditioning: G1, control group; G2, Nd:YAG laser; G3, laser + aluminum oxide sandblasting (Al2O3); G4, Al2O3; and G5, Al2O3 + laser. All groups had lingual brackets bonded and shear debonded after 72 h. SBS values were analyzed, and the enamel morphology was evaluated by optical coherence tomography (OCT) and scanning electron microscope (SEM), before and after preconditioning surface. The optical attenuation coefficient (α) analysis was obtained from OCT images. Data analysis used the ANOVA test, followed by post hoc Tukey, Kruskal Wallis, and post hoc Dunn tests (significance of 5%). RESULTS The SBS values presented similarly among groups, but the value of α showed statistical difference (p-value = 0.0124) between G3 and G5 with the others. Optical analyses indicated a melting on the enamel that suffered laser irradiation for G2 and G5 and crystal surface disorganization for G4. Sandblasting partially removes the melting of the laser effect (G3). CONCLUSION The sandblasting is a dispensable step for bonding lingual brackets, and the melting of the enamel after laser irradiation does not compromise the bracket adhesive resistance. CLINICAL RELEVANCE The Nd:YAG laser became an interesting tool to prevent caries and decrease prevalence of white spot lesions in orthodontic treatments, without systemic effects in patients with genetic high risks of caries.
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Affiliation(s)
- Mônica Schäffer Lopes
- Department of Prosthesis and Buco-Facial Surgery, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235 - Cidade Universitária, Recife, PE, 50670-901, Brazil
| | - Daísa Lima Pereira
- Center for Lasers and Applications, Instituto de Pesquisas Energéticas e Nucleares, Av. Prof. Lineu Prestes, 2242 - Butantã, São Paulo, SP, 05508-000, Brazil
| | | | - Marcello Magri Amaral
- Biomedical Engineering program, Universidade Brasil, Instituto Científico e Tecnologico, Rua Carolina Fonseca, 584 Itaquera, Sao Paulo, SP, 08230-030, Brazil
| | - Denise Maria Zezell
- Center for Lasers and Applications, Instituto de Pesquisas Energéticas e Nucleares, Av. Prof. Lineu Prestes, 2242 - Butantã, São Paulo, SP, 05508-000, Brazil.
| | - Anderson Stevens Leonidas Gomes
- Graduate Program in Dentistry and Department of Physics, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235 - Cidade Universitária, Recife, PE, 50670-901, Brazil
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15
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Del-Valle M, Lins E, Ana P. Assessment of simulated osteoporosis in alveolar bone using optical coherence tomography. JOURNAL OF BIOPHOTONICS 2019; 12:e201900171. [PMID: 31483943 DOI: 10.1002/jbio.201900171] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2019] [Revised: 08/16/2019] [Accepted: 09/01/2019] [Indexed: 06/10/2023]
Abstract
Steoporosis is a skeletal disorder that compromises bone resistance and its diagnosis is usually performed using dual energy X-ray absorptiometry. Thus, the search for efficient diagnostic methods that do not involve the emission of ionizing radiation is necessary. This study proposed to use the Optical Coherence Tomography (OCT) to evaluate osteoporosis in alveolar bone. Osteoporosis lesions is simulated in vitro in porcine bones, and imaging is performed by OCT and micro-computed tomography (micro-CT). A developed algorithm is proposed to calculate the optical attenuation coefficient ( μ t ), mean optical attenuation coefficient ( μ¯t ), integrated reflectivity (ΔR) and bone density ( BD). The μ¯t , ΔR and BD parameters shows a good correlation to micro-CT parameters (bone volume/tissue volume and total porosity). The μ t and μ¯t methods are negatively impacted by non-uniform intensities distribution in osteoporosis images. In conclusion, BD and ΔR analysis demonstrates to be potential techniques for diagnosis and monitoring of osteoporosis using OCT.
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Affiliation(s)
- Matheus Del-Valle
- Center of Engineering, Modeling and Applied Social Sciences, Federal University of ABC, São Paulo, Brazil
| | - Emery Lins
- Biomedical Engineering Department, Federal University of Pernambuco, Recife, Pernambuco, Brazil
| | - Patricia Ana
- Center of Engineering, Modeling and Applied Social Sciences, Federal University of ABC, São Paulo, Brazil
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16
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Sahyoun CC, Subhash HM, Peru D, Ellwood RP, Pierce MC. An Experimental Review of Optical Coherence Tomography Systems for Noninvasive Assessment of Hard Dental Tissues. Caries Res 2019; 54:43-54. [PMID: 31533102 DOI: 10.1159/000502375] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Accepted: 07/26/2019] [Indexed: 11/19/2022] Open
Abstract
Optical coherence tomography (OCT) is a noninvasive, high-resolution, cross-sectional imaging technique. To date, OCT has been demonstrated in several areas of dentistry, primarily using wavelengths around 1,300 nm, low numerical aperture (NA) imaging lenses, and detectors insensitive to the polarization of light. The objective of this study is to compare the performance of three commercially available OCT systems operating with alternative wavelengths, imaging lenses, and detectors for OCT imaging of dental enamel. Spectral-domain (SD) OCT systems with (i) 840 nm (Lumedica, OQ LabScope 1.0), (ii) 1,300 nm (Thorlabs, Tel320) center wavelengths, and (iii) a swept-source (SS) OCT system (Thorlabs OCS1300SS) centered at 1,325 nm with optional polarization-sensitive detection were used. Low NA (0.04) and high NA (0.15) imaging lenses were used with system (iii). Healthy in vivo and in vitrohuman enamel and eroded in vitro bovine enamel specimens were imaged. The Tel320 system achieved greater imaging depth than the OQ LabScope 1.0, on average imaging 2.6 times deeper into the tooth (n = 10). The low NA lens provided a larger field of view and depth of focus, while the high NA lens provided higher lateral resolution and greater contrast. Polarization-sensitive imaging eliminated birefringent banding artifacts that can appear in conventional OCT scans. In summary, this study illustrates the performance of three commercially available OCT systems, objective lenses, and imaging modes and how these can affect imaging depth, resolution, field of view, and contrast in enamel. Users investigating OCT for dental applications should consider these factors when selecting an OCT system for clinical or basic science studies.
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Affiliation(s)
- Christine C Sahyoun
- Department of Biomedical Engineering, Rutgers, the State University of New Jersey, Piscataway, New Jersey, USA
| | - Hrebesh M Subhash
- Global Development Center, Colgate-Palmolive Company, Piscataway, New Jersey, USA
| | - Deborah Peru
- Global Development Center, Colgate-Palmolive Company, Piscataway, New Jersey, USA
| | - Roger P Ellwood
- Global Development Center, Colgate-Palmolive Company, Piscataway, New Jersey, USA
| | - Mark C Pierce
- Department of Biomedical Engineering, Rutgers, the State University of New Jersey, Piscataway, New Jersey, USA,
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17
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Theobaldo JD, Vieira-Junior WF, Catelan A, Mainardi MDCA, Ysnaga OA, Rodrigues-Filho UP, Marchi GM, Lima DA, Aguiar FHB. Effect of Heavy Metals Contamination from Cigarette Smoke on Sound and Caries-Like Enamel. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2018; 24:762-767. [PMID: 30463633 DOI: 10.1017/s1431927618015404] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In this study, we sought to evaluate the influence of cigarette smoke and pH cycling on the chemical composition and surface/cross-sectional enamel microhardness. A total of 40 dental blocks obtained from bovine incisors were divided into four groups (n=10): no treatment (control); exposure to cigarette smoke (CS); exposure to pH cycling (PC); and exposure to cigarette smoke and pH cycling (CS-PC). The samples were analyzed by synchrotron radiation micro X-ray fluorescence, bench mode X-ray fluorescence, as well as surface microhardness (SMH) and cross-sectional microhardness (CSMH) testing. The SMH results were submitted to analysis of variance (ANOVA) and Tukey's test. The CSMH results were evaluated using split-plot ANOVA and Tukey's test. A high amount of Cd and Pb and traces of Ni and As were observed in enamel and dentin after exposure to cigarette smoke (CS and CS-PC). The SMH and CSMH of CS were statistically higher when compared with the control. The PC and CS-PC showed lower SMH and CSMH. We conclude that exposure to cigarette smoke promoted heavy metal deposition in enamel/dentin. In addition, it increased the enamel microhardness but did not promote a protective effect on the in vitro development of caries. The clinical significance of this work is that there is significant bioaccumulation of heavy metals from cigarette smoke on the surface and in the enamel and dentin.
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Affiliation(s)
- Jéssica D Theobaldo
- 1Department of Restorative Dentistry,Piracicaba Dental School,University of Campinas,Avenida Limeira,901,13.414-903Piracicaba,SP,Brazil
| | - Waldemir F Vieira-Junior
- 1Department of Restorative Dentistry,Piracicaba Dental School,University of Campinas,Avenida Limeira,901,13.414-903Piracicaba,SP,Brazil
| | - Anderson Catelan
- 1Department of Restorative Dentistry,Piracicaba Dental School,University of Campinas,Avenida Limeira,901,13.414-903Piracicaba,SP,Brazil
| | - Maria do Carmo A Mainardi
- 1Department of Restorative Dentistry,Piracicaba Dental School,University of Campinas,Avenida Limeira,901,13.414-903Piracicaba,SP,Brazil
| | - Orlando A Ysnaga
- 2Department of Chemistry and Materials Inorganic Hybrids,Institute of Chemistry of São Carlos,University of São Paulo,Avenida Trab. São-carlense,400,13563-120São Carlos,SP,Brazil
| | - Ubirajara P Rodrigues-Filho
- 2Department of Chemistry and Materials Inorganic Hybrids,Institute of Chemistry of São Carlos,University of São Paulo,Avenida Trab. São-carlense,400,13563-120São Carlos,SP,Brazil
| | - Giselle Maria Marchi
- 1Department of Restorative Dentistry,Piracicaba Dental School,University of Campinas,Avenida Limeira,901,13.414-903Piracicaba,SP,Brazil
| | - Débora A Lima
- 1Department of Restorative Dentistry,Piracicaba Dental School,University of Campinas,Avenida Limeira,901,13.414-903Piracicaba,SP,Brazil
| | - Flávio H B Aguiar
- 1Department of Restorative Dentistry,Piracicaba Dental School,University of Campinas,Avenida Limeira,901,13.414-903Piracicaba,SP,Brazil
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18
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Effects of a New Nano-Silver Fluoride-Containing Dentifrice on Demineralization of Enamel and Streptococcus mutans Adhesion and Acidogenicity. Int J Dent 2018; 2018:1351925. [PMID: 29853891 PMCID: PMC5964412 DOI: 10.1155/2018/1351925] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 03/13/2018] [Accepted: 04/01/2018] [Indexed: 01/03/2023] Open
Abstract
An experimental dentifrice containing nano-silver fluoride (NSF) and a sodium fluoride (NaF) toothpaste were tested in vitro, against S. mutans, to evaluate the minimal inhibitory concentration (MIC), minimal bactericidal concentration (MBC), antiadherence, antiacid, enamel microhardness, and OCT. The microdilution technique was used to determine the MIC and MBC. Fragments of deciduous enamel were treated with dentifrice slurries, containing bacterial suspension and PBS-treated saliva. The quantification of the microorganisms that adhered to the enamel was determined after 24 hours of incubation, and media pH readings were performed after 2 hours and 24 hours. Deciduous teeth were evaluated for microhardness and OCT during 14 days of pH cycling. Data were statistically analyzed using Student's t-test, Mann-Whitney U test, ANOVA, and Tukey tests at 5% of significance. Dentifrices containing NSF presented a lower MIC and higher statistically significant results compared to NaF dentifrices with respect to preventing bacterial adhesion and pH decreases. NSF and NaF dentifrices showed the same ability to avoid enamel demineralization corroborated by the OCT images. The NSF formulation had a better antibacterial effect compared to NaF dentifrices and similar action on the demineralization of enamel indicating their potential effectiveness to prevent caries.
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19
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Pereira DL, Freitas AZ, Bachmann L, Benetti C, Zezell DM, Ana PA. Variation on Molecular Structure, Crystallinity, and Optical Properties of Dentin Due to Nd:YAG Laser and Fluoride Aimed at Tooth Erosion Prevention. Int J Mol Sci 2018; 19:ijms19020433. [PMID: 29389868 PMCID: PMC5855655 DOI: 10.3390/ijms19020433] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Revised: 01/25/2018] [Accepted: 01/26/2018] [Indexed: 11/16/2022] Open
Abstract
This in vitro study evaluated the compositional, crystalline, and morphological effects promoted by Nd:YAG laser on root dentin, and verified the effects of laser and topical acidulated phosphate fluoride application (APF-gel) on dentin erosion. 180 bovine dentin slabs were randomized into 4 groups (n = 45): G1–untreated, G2–APF-gel (1.23% F−, 4 min), G3–Nd:YAG (1064 nm, 84.9 J/cm2, 10 Hz), and G4–APF-gel application followed by Nd:YAG laser irradiation. The compositional, crystalline, and morphological effects promoted by treatments were investigated on five samples of each experimental group. The other samples were submitted to a 5-day, 10-day, or 15-day erosive and abrasive demineralization and remineralization cycling in order to create erosion lesions. The area and depth of lesions, as well as the optical attenuation coefficient, were assessed, and all data were statistically analysed (p < 0.05). Nd:YAG laser promoted the reduction of carbonate, the formation of tetracalcium phosphate, as well as the melting and recrystallization of the dentin surface. Laser significantly decreased the area and depth of erosion lesions and altered the optical attenuation coefficient when compared to untreated and APF-gel groups, but the association of APF-gel and laser did not promote an additional effect. Nd:YAG laser irradiation can be a promissory treatment to prevent dentin erosion and the abrasion process.
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Affiliation(s)
- Daísa L Pereira
- Center for Engineering, Modeling and Applied Social Sciences, Universidade Federal do ABC, Sao Bernardo do Campo, SP 09606-045, Brazil.
- Center for Lasers and Applications, Instituto de Pesquisas Energéticas e Nucleares, IPEN-CNEN/SP, Sao Paulo, SP 05508-000, Brazil.
| | - Anderson Z Freitas
- Center for Lasers and Applications, Instituto de Pesquisas Energéticas e Nucleares, IPEN-CNEN/SP, Sao Paulo, SP 05508-000, Brazil.
| | - Luciano Bachmann
- Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de Sao Paulo, Ribeirao Preto, SP 14040-900, Brazil.
| | - Carolina Benetti
- Center for Engineering, Modeling and Applied Social Sciences, Universidade Federal do ABC, Sao Bernardo do Campo, SP 09606-045, Brazil.
| | - Denise M Zezell
- Center for Lasers and Applications, Instituto de Pesquisas Energéticas e Nucleares, IPEN-CNEN/SP, Sao Paulo, SP 05508-000, Brazil.
| | - Patricia A Ana
- Center for Engineering, Modeling and Applied Social Sciences, Universidade Federal do ABC, Sao Bernardo do Campo, SP 09606-045, Brazil.
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20
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Ei TZ, Shimada Y, Nakashima S, Romero MJRH, Sumi Y, Tagami J. Comparison of resin-based and glass ionomer sealants with regard to fluoride-release and anti-demineralization efficacy on adjacent unsealed enamel. Dent Mater J 2018; 37:104-112. [PMID: 28954939 DOI: 10.4012/dmj.2016-407] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This study compared resin-based and glass ionomer sealants with regard to their fluoride-release behavior and anti-demineralization potential on adjacent unsealed enamel surfaces. Sealant cavities prepared on bovine enamel blocks were filled with fluoride-containing resin sealants [TeethmateF-1 (TF), ClinproTM (CP)], and glass ionomer sealant [Fuji VII (FVII)]. Specimens were then incubated in artificial saliva for 14 days to measure fluoride. Thereafter, demineralization was performed for 10 days, and the anti-demineralization efficacy was assessed by Swept Source Optical Coherence Tomography (SS-OCT), and cross-sectional nanohardness. All data were statistically analyzed by using ANOVA. FVII exhibited the highest fluoride release. SS-OCT and nanohardness findings indicated that anti-demineralization efficacy of TF was the greatest, whereas FVII was not significantly different from that of CP. Resin sealants released a lower amount of fluoride but exhibited anti-demineralization effects on the adjacent unsealed enamel surfaces that were comparable to that of a glass ionomer sealant.
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Affiliation(s)
- Thwe Zin Ei
- Cariology and Operative Dentistry, Department of Restorative Science, Graduate School, Tokyo Medical and Dental University
| | - Yasushi Shimada
- Cariology and Operative Dentistry, Department of Restorative Science, Graduate School, Tokyo Medical and Dental University.,Department of Operative Dentistry, Okayama University
| | - Syozi Nakashima
- Cariology and Operative Dentistry, Department of Restorative Science, Graduate School, Tokyo Medical and Dental University
| | - Maria Jacinta Rosario H Romero
- Cariology and Operative Dentistry, Department of Restorative Science, Graduate School, Tokyo Medical and Dental University.,School of Dentistry, Centro Escolar University
| | - Yasunori Sumi
- Department for Advanced Dental Research, Center of Advanced Medicine for Dental and Oral Diseases, National Center for Geriatrics and Gerontology
| | - Junji Tagami
- Cariology and Operative Dentistry, Department of Restorative Science, Graduate School, Tokyo Medical and Dental University
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21
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Machoy M, Seeliger J, Szyszka-Sommerfeld L, Koprowski R, Gedrange T, Woźniak K. The Use of Optical Coherence Tomography in Dental Diagnostics: A State-of-the-Art Review. JOURNAL OF HEALTHCARE ENGINEERING 2017; 2017:7560645. [PMID: 29065642 PMCID: PMC5534297 DOI: 10.1155/2017/7560645] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 05/02/2017] [Accepted: 05/31/2017] [Indexed: 12/14/2022]
Abstract
Optical coherence tomography provides sections of tissues in a noncontact and noninvasive manner. The device measures the time delay and intensity of the light scattered or reflected from biological tissues, which results in tomographic imaging of their internal structure. This is achieved by scanning tissues at a resolution ranging from 1 to 15 μm. OCT enables real-time in situ imaging of tissues without the need for biopsy, histological procedures, or the use of X-rays, so it can be used in many fields of medicine. Its properties are not only particularly used in ophthalmology, in the diagnosis of all layers of the retina, but also increasingly in cardiology, gastroenterology, pulmonology, oncology, and dermatology. The basic properties of OCT, that is, noninvasiveness and low wattage of the used light, have also been appreciated in analytical technology by conservators, who use it to identify the quality and age of paintings, ceramics, or glass. Recently, the OCT technique of visualization is being tested in different fields of dentistry, which is depicted in the article.
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Affiliation(s)
- Monika Machoy
- Division of Orthodontics, Pomeranian Medical University in Szczecin, Ul. Powstańców Wlkp 72, 70-111 Szczecin, Poland
| | - Julia Seeliger
- Division of Orthodontics, Technical University Dresden, Fetscherstrasse 74, 01307 Dresden, Germany
| | - Liliana Szyszka-Sommerfeld
- Division of Orthodontics, Pomeranian Medical University in Szczecin, Ul. Powstańców Wlkp 72, 70-111 Szczecin, Poland
| | - Robert Koprowski
- Department of Biomedical Computer Systems, Faculty of Computer Science and Materials Science, Institute of Computer Science, University of Silesia, Ul. Będzińska 39, 41-200 Sosnowiec, Poland
| | - Tomasz Gedrange
- Division of Orthodontics, Technical University Dresden, Fetscherstrasse 74, 01307 Dresden, Germany
| | - Krzysztof Woźniak
- Division of Orthodontics, Pomeranian Medical University in Szczecin, Ul. Powstańców Wlkp 72, 70-111 Szczecin, Poland
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22
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Watanabe H, Kuribayashi A, Sumi Y, Kurabayashi T. Resolution characteristics of optical coherence tomography for dental use. Dentomaxillofac Radiol 2017; 46:20160358. [PMID: 28059563 DOI: 10.1259/dmfr.20160358] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVES The purpose of this study was to clarify the resolution characteristics of optical coherence tomography (OCT) for dental use. METHODS Two types of swept-source optical coherence tomography machines were employed in this study. To clarify their resolution characteristics, we newly developed a glass chart device with a ladder pattern of wavelengths, which ranged from 4 × 2 μm to 1024 × 2 μm, as well as a star-target pattern, a grid pattern and a spatial frequency response pattern. The resolving powers and characteristics of the OCTs were subjectively evaluated. RESULTS The Santec OCT-2000™ (Santec Co., Komaki, Japan) had a resolving power of 64 μm in both the horizontal X and vertical Y directions, while the OCT from Yoshida had a resolving power of 64 μm in the horizontal X direction and 128 µm in the vertical Y direction. The resolving power of the depth Z direction could not be obtained from this study. With the Yoshida OCT, the star-target pattern seemed to be non-symmetrical, owing to an edge enhancement effect, which was revealed when the ladder patterns were placed in a horizontal direction. CONCLUSIONS This study successfully clarified the resolution characteristics of two types of OCTs. The obtained data may be useful for diagnostic purposes, and the glass chart device used in this study may be useful for OCT quality assurance programmes.
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Affiliation(s)
- Hiroshi Watanabe
- 1 Department of Oral and Maxillofacial Radiology, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan
| | - Ami Kuribayashi
- 1 Department of Oral and Maxillofacial Radiology, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan
| | - Yasunori Sumi
- 2 National Center of Advanced Medicine for Dental and Oral Diseases, National Center for Geriatrics and Gerontology, Obu, Japan
| | - Tohru Kurabayashi
- 1 Department of Oral and Maxillofacial Radiology, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan
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23
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Bio-Photonic Detection and Quantitative Evaluation Method for the Progression of Dental Caries Using Optical Frequency-Domain Imaging Method. SENSORS 2016; 16:s16122076. [PMID: 27929440 PMCID: PMC5191057 DOI: 10.3390/s16122076] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Revised: 11/26/2016] [Accepted: 12/02/2016] [Indexed: 11/16/2022]
Abstract
The initial detection of dental caries is an essential biomedical requirement to barricade the progression of caries and tooth demineralization. The objective of this study is to introduce an optical frequency-domain imaging technique based quantitative evaluation method to calculate the volume and thickness of enamel residual, and a quantification method was developed to evaluate the total intensity fluctuation in depth direction owing to carious lesions, which can be favorable to identify the progression of dental caries in advance. The cross-sectional images of the ex vivo tooth samples were acquired using 1.3 μm spectral domain optical coherence tomography system (SD-OCT). Moreover, the advantages of the proposed method over the conventional dental inspection methods were compared to highlight the potential capability of OCT. As a consequence, the threshold parameters obtained through the developed method can be used as an efficient investigating technique for the initial detection of demineralization.
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Tezuka H, Shimada Y, Matin K, Ikeda M, Sadr A, Sumi Y, Tagami J. Assessment of cervical demineralization induced by Streptococcus mutans using swept-source optical coherence tomography. J Med Imaging (Bellingham) 2016; 3:014504. [PMID: 27014718 DOI: 10.1117/1.jmi.3.1.014504] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Accepted: 02/11/2016] [Indexed: 12/19/2022] Open
Abstract
Exposed root surfaces due to gingival recession are subject to biofilm stagnation that can result in caries formation. Cervical enamel and dentin demineralization induced by a cariogenic biofilm was evaluated using swept-source optical coherence tomography (SS-OCT). The cementoenamel junction (CEJ) sections of extracted human teeth were subjected to demineralization for 1, 2, or 3 weeks. A suspension of Streptococcus mutans was applied to form a cariogenic biofilm using an oral biofilm reactor. After incubation, demineralization was observed by SS-OCT. For the analysis of SS-OCT signal, the value of the area under the curve (AUC) of the signal profile was measured. Statistical analyses were performed with 95% level of confidence. Cervical demineralization was displayed as a bright zone in SS-OCT. The demineralization depth of dentin was significantly deeper than that of enamel ([Formula: see text]). Enamel near the CEJ demonstrated a significant increase of AUC over the other enamel region after the demineralization. The gaps along the dentinoenamel junction were additionally observed in SS-OCT. SS-OCT was capable of monitoring the cervical demineralization induced by a cariogenic biofilm and is considered to be a promising modality for the diagnosis of cervical demineralization.
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Affiliation(s)
- Hiroki Tezuka
- Graduate School of Tokyo Medical and Dental University , Department of Cariology and Operative Dentistry, Tokyo, Japan
| | - Yasushi Shimada
- Graduate School of Tokyo Medical and Dental University , Department of Cariology and Operative Dentistry, Tokyo, Japan
| | - Khairul Matin
- Graduate School of Tokyo Medical and Dental University, Department of Cariology and Operative Dentistry, Tokyo, Japan; Tsurumi University, School of Dental Medicine, Endowed Department of International Oral Health Science, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama-shi 230-8501, Japan
| | - Masaomi Ikeda
- Tokyo Medical and Dental University , Clinical Oral Science, Department of Oral Health Care Sciences, Faculty of Dentistry, Tokyo, Japan
| | - Alireza Sadr
- University of Washington School of Dentistry , Department of Restorative Dentistry, Seattle, Washington 98195, United States
| | - Yasunori Sumi
- National Center for Geriatrics and Gerontology , Department of Advanced Dental Research, Center of Advanced Medicine for Dental and Oral Diseases, Obu, Aichi, Japan
| | - Junji Tagami
- Graduate School of Tokyo Medical and Dental University , Department of Cariology and Operative Dentistry, Tokyo, Japan
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25
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van der Veen MH. Detecting Short-Term Changes in the Activity of Caries Lesions with the Aid of New Technologies. CURRENT ORAL HEALTH REPORTS 2015; 2:102-109. [PMID: 26317065 PMCID: PMC4544495 DOI: 10.1007/s40496-015-0050-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This paper discusses the use of new technologies for the assessment of caries and more in particular changes in caries activity. Over the past decades, we have seen a shift from restorative treatment caries to a prevention-driven approach. Also there is a need for shorter and less expensive caries clinical trials. These demand earlier detection of lesions and the monitoring of lesion changes longitudinally in time, which has led to the development of new technologies to aid clinical visual examination. Also clinical visual inspection indices have been refined to fit this purpose. There is a constant flow of technologies emerging and disappearing. This review discusses the merits of recent developments regarding their respective uses for research purposes in testing new caries prevention strategies as well as in clinical caries management in dental private practice. Which technique to choose highly depends on the needed resolution of information.
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Affiliation(s)
- M. H. van der Veen
- Department of Preventive Dentistry, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and VU University, Amsterdam, Gustav Mahlerlaan 3004, 1081 LA Amsterdam, The Netherlands
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26
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Dental optical coherence tomography: new potential diagnostic system for cracked-tooth syndrome. Surg Radiol Anat 2015; 38:49-54. [DOI: 10.1007/s00276-015-1514-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Accepted: 06/29/2015] [Indexed: 10/23/2022]
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