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Current perspectives of nanoparticles in medical and dental biomaterials

The Journal of Biomedical Research 2012年第3期26卷 143-151页

作者： Ibrahim Mohamed Hamouda Department of dental biomaterials and Restorative Dentistry Faculty of Dentistry Mansoura University Mansoura Dakahleya 35516 Egypt

Nanotechnology is gaining tremendous impetus due to its capability of modulating metals into their nanosize, which drastically changes the chemical, physical and optical properties of metals. Nanoparticles have been intro- duced as materials with good potential to be extensively used in biological and medical applications. Nanoparticles are clusters of atoms in the size range of 1-100 nm. Inorganic nanoparticles and their nano-composites are applied as good antibacterial agents. Due to the outbreak of infectious diseases caused by different pathogenic bacteria and the development of antibiotic resistance, pharmaceutical companies and researchers are searching for new antibacterial agents. The metallic nanoparticles are the most promising as they show good antibacterial properties due to their large surface area to volume ratios, which draw growing interest from researchers due to increasing microbial resistance against metal ions, antibiotics and the development of resistant strains. Metallic nanoparticles can be used as effective growth inhibitors in various microorganisms and thereby are applicable to diverse medical devices. Nanotechnology discloses the use of elemental nanoparticles as active antibacterial ingredient for dental materials. In dentistry, both restorative materials and oral bacteria are believed to be responsible for restoration failure. Secondary caries is found to be the main reason to restoration failure. Secondary caries is primarily caused by invasion of plaque bacteria （acid-producing bacteria） such as Streptococcus mutans and lactobacilli in the presence of fermentable carbohydrates. To make long-lasting restorations, antibacterial materials should be made. The potential of nanoparticles to control the formation of biofilms within the oral cavity is also coming under in- creasing scrutiny. Possible uses of nanoparticles as topically applied agents within dental materials and the appli- cation of nanoparticles in the control of oral infection

关键词： nanoparticles nano-medicine nano-biomaterials nanotechnology antibacterial agent

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Application of digital image correlation to full-field measurement of shrinkage strain of dental composites

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第1期14卷 1-10页

作者： Jian-ying LI Andrew LAU Alex S. L. FOK Minnesota dental Research Centre for biomaterials and Biomechanics School of Dentistry University of Minnesota Minneapolis MN 55455 USA

Objectives： Polymerization shrinkage of dental composites remains a major concern in restorative dentistry because it can lead to micro-cracking of the tooth and debonding at the tooth-restoration interface. The aim of this study was to measure the full-field polymerization shrinkage of dental composites using the optical digital image correlation （DIC） method and to evaluate how the measurement is influenced by the factors in experiment setup and image analysis. Methods： Four commercial dental composites, Premise Dentine, Z 100, Z250 and Tetric EvoCeram, were tested. Composite was first placed into a slot mould to form a bar specimen with rectangular-section of 4 mmx2 mm, followed by the surface painting to create irregular speckles. Curing was then applied at one end of the specimen while the other part were covered against curing light for simulating the clinical curing condition of composite in dental cavity. The painted surface was recorded by a charge-coupled device （CCD） camera before and after curing. Subsequently, the volumetric shrinkage of the specimen was calculated with specialist DIC software based on image cross correlation. In addition, a few factors that may influence the measuring accuracy, including the subset window size, speckle size, illumination light and specimen length, were also evaluated. Results： The volumetric shrinkage of the specimen generally decreases with increasing distance from the irradiated surface with a conspicuous exception being the composite Premise Dentine as its maximum shrinkage occurred at a subsurface distance of about 1 mm instead of the irradiated surface. Z100 had the greatest maximum shrinkage strain, followed by Z250, Tetric EvoCeram and then Premise Dentine. Larger subset window size made the shrinkage strain contour smoother. But the cost was that some details in the heterogeneity of the material were lost. Very small subset window size resulted in a lot of noise in the data, making it difficult to discern the g

关键词： Image correlation dental composite Polymerization shrinkage Depth of cure

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Epigenetic therapeutics in dental pulp treatment: Hopes, challenges and concerns for the development of next-generation biomaterials

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Bioactive Materials 2023年第9期27卷 574-593页

作者： Henry F.Duncan Yoshifumi Kobayashi Michaela Kearney Emi Shimizu Division of Restorative Dentistry&Periodontology Dublin Dental University HospitalTrinity College DublinUniversity of DublinLincoln PlaceDublinIreland Department of Oral Biology Rutgers School of Dental MedicineNewarkNJUSA

This opinion-led review paper highlights the need for novel translational research in vital-pulp-treatment(VPT),but also discusses the challenges in translating evidence to *** dentistry is expensive,invasive and relies on an outmoded mechanical understanding of dental disease,rather than employing a biological perspective that harnesses cell activity and the *** research has focussed on developing minimally-invasive biologically-based‘fillings’that preserve the dental pulp;research that is shifting the paradigm from expensive high-technology dentistry,with high failure rates,to smart restorations targeted at biological *** VPTs promote repair by recruiting odontoblast-like cells in a material-dependent ***,exciting opportunities exist for development of next-generation biomaterials targeted at regenerative processes in the dentin-pulp *** article analyses recent research using pharmacological-inhibitors to therapeutically-target histone-deacetylase(HDAC)enzymes in dental-pulp-cells(DPCs)that stimulate pro-regenerative effects with limited loss of ***,HDAC-inhibitors have the potential to enhance biomaterial-driven tissue responses at low concentration by influencing the cellular processes with minimal side-effects,providing an opportunity to develop a topically-placed,inexpensive bio-inductive pulp-capping *** positive results,clinical translation of these innovations requires enterprise to counteract regulatory obstacles,dental-industry priorities and to develop strong academic/industry *** aim of this opinion-led review paper is to discuss the potential role of therapeutically-targeting epigenetic modifications as part of a topical VPT strategy in the treatment of the damaged dental pulp,while considering the next steps,material considerations,challenges and future for the clinical development of epigenetic therapeutics or other‘smart’restora

关键词： Epigenetics Vital pulp treatment Histone deacetylase inhibitors Regenerative endodontics Pulp capping

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Influence of surface roughness on the color of dental-resin composites

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第7期12卷 552-562页

作者： Razvan GHINEA Laura UGARTE-ALVAN Ana YEBRA Oscar E.PECHO Rade D.PARAVINA Maria del Mar PEREZ Department of Optics Faculty of ScienceUniversity of Granada Department of Stomatology Faculty of OdontologyUniversity of Granada Houston Center for biomaterials and Biomimetics & Department of Restorative Dentistry and biomaterials University of Texas Dental Branch at Houston

This study deals with the influence of surface roughness on the color of resin *** resin composites (microfilled,hybrid,and microhybrid) were each polished with 500-grit,1 200-grit,2 000-grit,and 4 000-grit SiC *** roughness parameter (Ra) was measured using a Plμ confocal microscope,and field-emission scanning electron microscope (Fe-SEM) images were used to investigate filler *** was measured using a spectroradiometer and a D65 standard illuminant (geometry diffuse/0° specular component excluded (SCE) mode).Surface roughness decreased with grit number and was not influenced by filler size or size distribution.A significant influence of Ra on lightness (L*) was *** increased with decreases in roughness,except for specimens that underwent polishing procedure 4 (PP4;500-grit,1 200-grit,2 000-grit,and 4 000-grit SiC papers consecutively).Generally,it was found that surface roughness influenced the color of resin *** composites that underwent PP1 (500-grit SiC paper) exhibited significant differences in chroma (C*),hue (h°),and lightness (L*) compared to composites that underwent PP3 (500-grit,1 200-grit,and 2 000-grit SiC papers consecutively) and *** difference (E*) between the polishing procedures was within acceptability thresholds in dentistry.

关键词： Color measurement dental resin composites Roughness

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Electrochemical behavior of dental implant system before and after clinical use

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中国有色金属学会会刊：英文版 2009年第4期19卷 846-851页

作者： Chae-Heon CHUNG Hee-Jung KIM Yong-Tae JEONG Mee-Kyoung SON Yong-Hoon JEONG Han-Cheol CHOE Department of Prosthodontics College of DentistryChosun University Department of dental Materials & Research Center of Nano-Interface Activation for biomaterials College of DentistryChosun University

Electrochemical behavior of dental implant system before and after clinical use(in vivo and in vitro) was researched by using abutment and titanium *** simulate an oral environment,the samples of clinically used and non-used implant systems as a working electrode were exposed to artificial saliva at(36.5±1) ℃.Electrochemical tests were carried out using a *** electrochemical test,the corrosion morphology of each sample was investigated by FE-SEM and *** corrosion potential and pitting potential of clinically used implant system are lower than those of non-used implant system,and clinically used implant system exhibits a lower range of passivation,indicating a less degree of inherent resistance against chloride *** polarization resistance decreases in the case of clinically used implant system,whereas,Rp for clinically non-used implant system increases compared with clinically used implant system.

关键词：电化学行为种植制度临床应用使用制度临床使用电化学测试夹具系统腐蚀形态

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In-vitro bioactivity evaluation and physical properties of an epoxy-based dental sealer reinforced with synthesized fluorine-substituted hydroxyapatite, hydroxyapatite and bioactive glass nanofillers

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Bioactive Materials 2019年第1期4卷 322-333页

作者： Bahaa Abdulrazzaq Jerri Al-Bakhsh Farhad Shafiei Atieh Hashemian Kiana Shekofteh Behnam Bolhari Marjan Behroozibakhsh Department of dental biomaterials School of DentistryTehran University of Medical SciencesTehranIran Department of Conservative Dentistry Dental School of University of BasraBasraIraq Department of dental biomaterials School of Dentistry/Research Center for Science and Technology in MedicineTehran University of Medical SciencesTehranIran Department of Endodontic School of DentistryTehran University of Medical SciencesTehranIran

The purpose of this study was to evaluate the physical properties and bioactivity potential of epoxy-based dental sealers modified with synthesized bioactive glass(BAG),hydroxyapatite(HA)and fluorine substituted hydroxyapatite(FHA)*** synthesized powders were incorporated at 10%and 20%into the epoxy-based dental *** setting time,flow and solubility and microhardness of the modified and unmodified samples were *** bioactivity was evaluated using FESEM-EDX and elemental mapping,ATR-FTIR and *** flow value of all of the experimental groups except the FHA modified samples,was greater than 20 *** solubility,no specimens exhibited more than 1%weight *** solubility value of the FHA groups was statistically significant lower than other groups(p≤0.001).The mean hardness values of all of the modified samples were significantly higher than the unmodified group(p≤0.001).Regarding bioactivity,in vitro study revealed that after 3 days immersion in SBF a compact and continuous calcium phosphate layer formed on the surface of epoxy sealers containing BAG and HA *** on these results,the addition of BAG and HA nanoparticles did not adversely alter the physical properties of epoxy ***,they improved the in vitro bioactivity of the epoxy sealer.

关键词： Bioactivity Bioactive glass Epoxy-based dental sealer Hydroxyapatite Fluorine-substituted hydroxyapatite

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PHOTOCURING STUDY OF NEW dental RESINS BASED ON MULTIFUNCTIONAL ACRYLIC ISOCYANURATE BY PHOTOCALORIMETRY

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Chinese Journal of Polymer Science 1999年第5期17卷 411-415页

作者：聂俊 L.A.Linden J.F.Rabek Institute of Photographic Chemistry Chinese Academy of Sciences Beijing 100101 China Department of dental biomaterials Science Karolinska Institute S14104 Huddinge Stockholm

Photocuring of new dental resins composed of tri(2-hydroxyethyl) isocyanurate triacrylate (THITA) alone and its mixtures with trimethylolpropane triacrylate (TMPTA) or pentaerythritol triacrylate (PETA) initiated by camphorquinone/amine system was studied by photocalorimetry. Among several different amines as coinitiators, 2-ethyl-4-dimethylaminobenzoate (AM-3), N,N-dimethylbenzylamine (AM-5) and 2,4,6-[tri(dimethylaminomethyl)]phenol (AM-6) are most effective. Upon irradiation, photopolymerization can occur immediately and no induction period appears in N-2 nor in air. Comparing the THITA/TMPTA and THITA/PETA mixtures, the parameters of photopolymerization and hardness of photocured samples show a small difference and only change slightly with varying molar ratios of mixture. In the presence of inorganic filler, the hardness of photocuring resins is almost the same as that for commercial products.

关键词： multifunctional acrylates photocuring dental resin network

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Setting kinetics and mechanical properties of flax fibre reinforced glass ionomer restorative materials

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The Journal of Biomedical Research 2017年第3期31卷 264-272页

作者： Ensanya Ali Abou Neel Anne M.Young Division of biomaterials Conservative Dental Sciences DepartmentKing Abdualziz University biomaterials Department Faculty of DentistryTanta University Division of biomaterials and Tissue Engineering UCL Eastman Dental Institute

Regardless of the excellent properties of glass ionomer cements,their poor mechanical properties limit their applications to non-load bearing *** study aimed to investigate the effect of incorporated short,chopped and randomly distributed flax fibers（0,0.5,1,2.5,5 and 25 wt%） on setting reaction kinetics,and mechanical and morphological properties of glass ionomer *** of flax fibers did not significantly affect the setting reaction *** to their content,flax fibers increased the compressive（from 148 to 250 MPa） and flexure strength（from 20 to 42 MPa）.They also changed the brittle behavior of glass ionomer cements to a plastic *** significantly reduced the compressive（from 3 to 1.3 GPa） and flexure modulus（from 19 to 14 GPa）.Accordingly,flax fiber-modified glass ionomer cements could be potentially used in high-stress bearing areas.

关键词： setting kinetics flax fibre glass ionomer cements

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Nanostructure and corrosion behaviors of nanotube formed Ti-Zr alloy

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中国有色金属学会会刊：英文版 2009年第4期19卷 1005-1008页

作者： Won-Gi KIM Han-Cheol CHOE Department of dental Materials & Research Center of Nano-Interface Activation for biomaterials College of DentistryChosun University

In order to investigate the nanostructures and corrosion behaviors of Ti-Zr alloys,nanotube formed Ti-Zr(10%,20%,30% and 40% in mass fraction) alloys were prepared by arc melting and the condition of controlling nanostructure was at 1 000 ℃ for 24 h in argon atmosphere;formation of nanotubes was conducted by anodizing a Ti-Zr alloy in H3PO4 electrolyte with a small amount of fluoride ions at room *** corrosion properties of specimens were examined through potentiodynamic test(potential range of -1 500-2 000 mV) in 0.9% NaCl solution by using *** of the alloys were observed by optical microscope(OM),field emission scanning electron microscope(FE-SEM) and X-ray diffractometer(XRD).Diameter of nanotube does not depend on Zr content,but interspace of nanotube predominantly depends on Zr content,which confirms that ZrO2 oxides play a role to increase the interspace of nanotube formed on the surface.

关键词：钛锆合金纳米结构腐蚀行为扫描电子显微镜 NaCl溶液阳极氧化光学显微镜 X射线衍射

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Present status and future directions:Apexification

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World Journal of Methodology 2025年第1期15卷 26-32页

作者： Sachin Chauhan Radha Chauhan Prashant Bhasin Bhavna G Sharaf Department of Conservative Dentistry and Endodontics Sudha Rustagi College of Dental Sciences and ResearchFaridabad 121002HaryanaIndia Department of Prosthodontics and Crown and Bridge and Oral Implantology Mahatma Gandhi Dental College&HospitalJaipur 302022RajasthanIndia Department of Pedodontics and Preventive Dentistry Sudha Rustagi College of Dental Sciences and ResearchFaridabad 121002HaryanaIndia

The success rate of apexification is primarily determined by multiple factors,including the material used,the size of the open apex compared to the length of the root,and the technique used in each *** main objective of this review was to provide an update on the present management of open apex to identify factors and circumstances that may influence the success of apexification using different materials and *** research on apexification should focus on how to treat open apices with wide periapical lesions without ***,the predictability of these parameters with non-surgical procedures was uncertain,but now,with the use of a dental operating microscope,it has become more *** reason could be that extra visits are no longer required due to major advances in the armamentarium and materials used for apexification.

关键词： Bioceramics Magnification Biodentine Mineral trioxide aggregate Apexification Open apex

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