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Peel A, Bennion D, Horne R, Hansen MR, Guymon CA. Photografted Zwitterionic Hydrogel Coating Durability for Reduced Foreign Body Response to Cochlear Implants. ACS APPLIED BIO MATERIALS 2024; 7:3124-3135. [PMID: 38584364 PMCID: PMC11110053 DOI: 10.1021/acsabm.4c00156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 03/21/2024] [Accepted: 03/22/2024] [Indexed: 04/09/2024]
Abstract
The durability of photografted zwitterionic hydrogel coatings on cochlear implant biomaterials was examined to determine the viability of these antifouling surfaces during insertion and long-term implant usage. Tribometry was used to determine the effect of zwitterionic coatings on the lubricity of surfaces with varying hydration levels, applied normal force, and time frame. Additionally, flexural resistance was investigated using mandrel bending. Ex vivo durability was assessed by determining the coefficient of friction between tissues and treated surfaces. Furthermore, cochlear implantation force was measured using cadaveric human cochleae. Hydrated zwitterionic hydrogel coatings reduced frictional resistance approximately 20-fold compared to uncoated PDMS, which led to significantly lower mean force experienced by coated cochlear implants during insertion compared to uncoated systems. Under flexural force, zwitterionic films resisted failure for up to 60 min of desiccation. The large increase in lubricity was maintained for 20 h under continual force while hydrated. For loosely cross-linked systems, films remained stable and lubricious even after rehydration following complete drying. All coatings remained hydrated and functional under frictional force for at least 30 min in ambient conditions allowing drying, with lower cross-link densities showing the greatest longevity. Moreover, photografted zwitterionic hydrogel samples showed no evidence of degradation and nearly identical lubricity before and after implantation. This work demonstrates that photografted zwitterionic hydrogel coatings are sufficiently durable to maintain viability before, during, and after implantation. Mechanical properties, including greatly increased lubricity, are preserved after complete drying and rehydration for various applied forces. Additionally, this significantly enhanced lubricity translates to significantly decreased force during insertion of implants which should result in less trauma and scarring.
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Affiliation(s)
- Adreann Peel
- Department
of Chemical and Biochemical Engineering, University of Iowa, Iowa City, Iowa 52242, United States
| | - Douglas Bennion
- Department
of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, Iowa 52242, United States
| | - Ryan Horne
- Department
of Chemical and Biochemical Engineering, University of Iowa, Iowa City, Iowa 52242, United States
| | - Marlan R. Hansen
- Department
of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, Iowa 52242, United States
| | - C. Allan Guymon
- Department
of Chemical and Biochemical Engineering, University of Iowa, Iowa City, Iowa 52242, United States
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Selvaprithiviraj V, Vaquette C, Ivanovski S. Hydrogel based soft tissue expanders for orodental reconstruction. Acta Biomater 2023; 172:53-66. [PMID: 37866723 DOI: 10.1016/j.actbio.2023.10.021] [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: 07/18/2023] [Revised: 10/10/2023] [Accepted: 10/17/2023] [Indexed: 10/24/2023]
Abstract
Tension-free flap closure to prevent soft tissue dehiscence is a prerequisite for successful bone augmentation in orodental reconstructive surgery. Since soft tissue contour follows the underlying jaw bony architecture, resorption of alveolar (jaw) bone limits the availability of soft tissue for wound closure following major bone reconstruction, required to facilitate oral rehabilitation with endosseous dental implants following tooth loss. Although there are several clinical procedures to increase soft tissue volume, these techniques are complicated and technically demanding. Soft tissue expansion, an established technique in reconstructive surgery, is an ideal alternative to generate surplus soft tissue prior to bone augmentation and dental implant placement. Increase in tissue volume can be achieved by using soft tissue expanders (STEs). Contemporary STEs have evolved from silicone balloons to osmotically inflating hydrogel-based systems. Here, we provide an overview of STEs in clinical oral surgery, outline the current research in STEs, and an update on recent clinical trials as well as the associated complications. Also, the mechanism governing soft tissue expansion and the critical factors that control the expansion process are covered. Design considerations for STEs for intraoral applications are given particular attention. Finally, we present our perspectives on utilization of minimally invasive methods to administer STEs for orodental applications. STATEMENT OF SIGNIFICANCE: Soft tissue expansion is required for a range of reconstructive applications and more notably in regenerative dentistry for vertical bone augmentation. This review describes the commercially available soft tissue expanders along with the latest systems being currently developed. This review insightfully discusses the biological and physical mechanisms leading to soft tissue expansion and critically assesses the design criteria of soft tissue expanders. A particular focus is given on the development of a new generation of hydrogel-based soft tissue expanders; their chemistry and required physical properties for tissue expansion is described and the obstacles towards clinical translations are identified. Finally, the review elaborates on promising minimally invasive injectable hydrogel-based tissue expanders and highlights the beneficial features of these systems.
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Affiliation(s)
- Vignesh Selvaprithiviraj
- The University of Queensland, School of Dentistry, Centre for Oral Regeneration, Reconstruction and Rehabilitation (COR3), Herston, QLD, Australia
| | - Cedryck Vaquette
- The University of Queensland, School of Dentistry, Centre for Oral Regeneration, Reconstruction and Rehabilitation (COR3), Herston, QLD, Australia; Herston Biofabrication Institute, Metro North Hospital and Health Service, Brisbane, QLD, Australia, S. Ivanovski, School of Dentistry, University of Queensland, 288 Herston Rd, Herston, Brisbane, QLD 4072, Australia
| | - Saso Ivanovski
- The University of Queensland, School of Dentistry, Centre for Oral Regeneration, Reconstruction and Rehabilitation (COR3), Herston, QLD, Australia.
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Majcher MJ, Himbert S, Vito F, Campea MA, Dave R, Vetergaard Jensen G, Rheinstadter MC, Smeets NMB, Hoare T. Investigating the Kinetics and Structure of Network Formation in Ultraviolet-Photopolymerizable Starch Nanogel Network Hydrogels via Very Small-Angle Neutron Scattering and Small-Amplitude Oscillatory Shear Rheology. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michael J. Majcher
- Department of Chemical Engineering, McMaster University, 1280 Main St. W., Hamilton, Ontario L8S 4L8, Canada
| | - Sebastian Himbert
- Department of Physics & Astronomy, McMaster University, 1280 Main St. W., Hamilton, Ontario L8S 4L8, Canada
| | - Francesco Vito
- Department of Chemical Engineering, McMaster University, 1280 Main St. W., Hamilton, Ontario L8S 4L8, Canada
| | - Matthew A. Campea
- Department of Chemical Engineering, McMaster University, 1280 Main St. W., Hamilton, Ontario L8S 4L8, Canada
| | - Ridhdhi Dave
- Department of Chemical Engineering, McMaster University, 1280 Main St. W., Hamilton, Ontario L8S 4L8, Canada
| | - Grethe Vetergaard Jensen
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6100, United States
| | - Maikel C. Rheinstadter
- Department of Physics & Astronomy, McMaster University, 1280 Main St. W., Hamilton, Ontario L8S 4L8, Canada
| | - Niels M. B. Smeets
- Department of Chemical Engineering, McMaster University, 1280 Main St. W., Hamilton, Ontario L8S 4L8, Canada
| | - Todd Hoare
- Department of Chemical Engineering, McMaster University, 1280 Main St. W., Hamilton, Ontario L8S 4L8, Canada
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Uyanga KA, Daoud WA. Carboxymethyl cellulose-chitosan composite hydrogel: Modelling and experimental study of the effect of composition on microstructure and swelling response. Int J Biol Macromol 2021; 181:1010-1022. [PMID: 33892027 DOI: 10.1016/j.ijbiomac.2021.04.117] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2020] [Revised: 02/27/2021] [Accepted: 04/18/2021] [Indexed: 12/15/2022]
Abstract
Molecular recognition is essential for the advancement of functional supramolecular natural polymer-based hydrogels. First, a series of carboxymethyl cellulose (CMC)-chitosan (CSN) hydrogels crosslinked with fumaric acid are studied, where the influence of composition on microstructure and swelling is investigated using mathematical modelling and experiment and the hydrolytic properties, microstructure parameters and physicochemical properties are examined. Second, best fit values for the responses are obtained using multiple linear regression and MATLAB R2020a curve fitting and predictive models are generated. Third, the optimum microstructure is loaded with polyethylene glycol (PEG) and bismuth telluride (Bi2Te3) and coated on fabric for imparting thermal sensitivity. The results show that (1) optimum microstructure (25.65 ± 1.86 nm mesh size, 116.25 ± 0.00 μmol/cm3 effective crosslinking-density, 348.03 ± 10.81% swelling, and 62.86 ± 1.11% gel fraction) is found at CMC:CSN = 1:3 for G3; (2) the model shows good agreement with experimental data demonstrating potential for estimating hydrogel swelling and microstructure; and (3) G3/PEG and G3/PEG/Bi2Te3 enhance thermal conductivity of fabric at ambient, body, and elevated temperatures. The study demonstrates the potential of the generated model in predicting CMC-CSN swelling and G3 as an ideal host matrix for wearable textiles/devices.
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Affiliation(s)
- Kindness A Uyanga
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
| | - Walid A Daoud
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong.
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