Rheological properties of topical fluoride gels

Plaizier-Vercammen, Jacqueline; Lecluse, E.; Boute, P; Nève, R.e. De

doi:10.1016/0109-5641(89)90119-x

Cited by 7 publications

(6 citation statements)

References 8 publications

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“…The extent of the increase in torque depends on various factors, such as the thickness of the medium, the viscosity of the medium, and the speed of rotation 21 . The viscosity of the various mediums are: blood 3.5–5.5 cP, 22 saliva 2.5–6 cP, 23 fluoride mouthwash, >500 cP 24 and chlorhexidine mouthwash >100 cP, 25 and gel >200 cP 26 whereas that of air is about 0. The various medium viscosities affect the tightening process and explains the clear statistical difference in the slope magnitudes.…”

Section: Discussionmentioning

confidence: 99%

The effect of contaminating media on the static and dynamic mechanical resilience of dental implant abutments' screws: In vitro study

Shemtov‐Yona,

Arieli,

Barhum

et al. 2023

Clin Implant Dent Rel Res

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IntroductionThis in vitro study aims to biomechanically evaluate the influence of medium contamination for example, saliva, blood, chlorhexidine (liquid and gel), and fluoride mouthwash on the biomechanical behavior of implant abutments' screws under static and dynamic loading.MethodsForty five Ti6Al4V commercial dental implants and abutments were tested in this study. Two main mechanical tests were carried out in the selected media. The first, static, aimed to evaluate the torque loss after the first tightening. The second, dynamic, involved a random cyclic load range between 0 and 200 N to evaluate torque loss due to mastication. In addition, metallographic longitudinal and cross‐sections of the abutment‐implant apparatus were examined to evaluate the abutment screw–abutment‐implant interface.ResultsThe static torque test showed that irrespective of the media, no statistical difference in static torque loss was found prior to dynamic loading. For the dynamic tests, torque‐angle evolution analysis during tightening to 30 Ncm and after the spectrum loading, showed the same global mechanical behavior for all media, but the statistical analysis indicated a difference between the groups in reverse torque values (RTV) and in the torque loss due to dynamic loading. The medium groups CHX, CHX‐gel, and Fluoride mouthwash, showed a meaningful torque loss due to loading, but the medium groups, control (no medium), blood and saliva showed an opposite trend and required a higher torque to open the abutment screws. The microstructural analysis revealed clear signs of cold‐welding/galling, post‐dynamic loading in these latter groups.ConclusionsThe presence of lubrication/contamination media (CHX mouthwash/CHX‐gel/Fluoride mouthwash) reduces the preload generated due to tightening but prevents damage due to galling. The observed reduction of RTV clearly emphasizes the need for frequent abutment screw retightening for implant‐supported prosthetic long‐term stability.

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Section: Discussionmentioning

confidence: 99%

The effect of contaminating media on the static and dynamic mechanical resilience of dental implant abutments' screws: In vitro study

Shemtov‐Yona,

Arieli,

Barhum

et al. 2023

Clin Implant Dent Rel Res

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“…Rheological investigations are basically concerned with determination of the relationship between shear stress and stress rate [23]. A large number of equations have been suggested to describe various non-Newtonian flow characteristics of solutions.…”

Section: Rheological Studiesmentioning

confidence: 99%

Development and Evaluation of In Situ Gel-forming System for Sustained Delivery of Insulin

2010

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Phase-sensitive in situ gel-forming controlled release formulations of insulin were prepared using poly(lactide-co-glycolide) and a solvent system consisting of various proportions of benzyl benzoate and benzyl alcohol. The in vitro release samples of formulations were assayed for insulin content by enzyme linked immunosorbent assay. Sodium dodecyl sulfate polyacrylamide gel electrophoresis and circular dichroism spectroscopy studies of released insulin confirmed its conformational stability. The stability of insulin in the formulation was assessed using Fourier transform infrared spectroscopy. Rheological properties of the formulations, assessed under isothermal conditions, showed dilatant behavior of all the formulations. In vivo studies were carried out on the optimized formulations vis-à-vis pure insulin in mice and blood glucose levels were monitored for 15 days. Mean percentage reduction in blood glucose levels was calculated in all the animals and the results analyzed using ANOVA. The studies construed better pharmacodynamic response for the two optimized formulations in controlling the blood glucose levels vis-à-vis routine once-a-day administration of insulin. The subcutaneous tissues, further subjected to scanning electron microscopy studies and histopathological examinations, ascertained the biocompatibility of the formulation.

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“…A less common approach to enhancing hydrogel printability involves the use of nanostructured fillers . This possibility was first described for Laponite, a charged discotic nanoclay, dispersed in poly(ethylene glycol) (PEG) solution . In an exfoliated state these particles spontaneously form a house-of-cards structure. , Laponite, in association with PEG and alginate, provided improved printability and, at higher clay concentrations, elevated recovery after shear .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Exfoliation of Calcium Organophosphonates for Tailoring Rheological Properties of Sodium Alginate Solutions: A Path toward Polysaccharide-Based Bioink

et al. 2023

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Layered nanoparticles with surface charge are explored as rheological modifiers for extrudable materials, utilizing their ability to induce electrostatic repulsion and create a house-of-cards structure. These nanoparticles provide mechanical support to the polymer matrix, resulting in increased viscosity and storage modulus. Moreover, their advantageous aspect ratio allows for shear-induced orientation and decreased viscosity during flow. In this work, we present a synthesis and liquid-based exfoliation procedure of phenylphosphonate–phosphate particles with enhanced ability to be intercalated by hydrophilic polymers. These layered nanoparticles are then tested as rheological modifiers of sodium alginate. The effective rheological modification is proved as the viscosity increases from 101 up to 103 Pa·s in steady state. Also, shear-thinning behavior is observed. The resulting nanocomposite hydrogels show potential as an extrudable bioink for 3D printing in tissue engineering and other biomedical applications, with good shape fidelity, nontoxicity, and satisfactory cell viability confirmed through encapsulation and printing of mouse fibroblasts.

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Rheological properties of topical fluoride gels

Cited by 7 publications

References 8 publications

The effect of contaminating media on the static and dynamic mechanical resilience of dental implant abutments' screws: In vitro study

The effect of contaminating media on the static and dynamic mechanical resilience of dental implant abutments' screws: In vitro study

Development and Evaluation of In Situ Gel-forming System for Sustained Delivery of Insulin

Synthesis and Exfoliation of Calcium Organophosphonates for Tailoring Rheological Properties of Sodium Alginate Solutions: A Path toward Polysaccharide-Based Bioink

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