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1.
J Burn Care Res ; 2024 Jun 15.
Article in English | MEDLINE | ID: mdl-38878005

ABSTRACT

Burn injuries related to Lithium-Ion batteries from personal mobility devices, such as electric bikes and electric scooters, have emerged as a global concern. By examining the literature, this study aims to provide an overview of the demographics, patterns and outcomes of personal mobility device-associated burns. A Singaporean cohort revealed burns resulting predominantly from fires occurring due to the combustion of unattended personal mobility device batteries during charging. In contrast, an Israeli cohort showed a higher TBSA and highlighted the vulnerability of limbs to burn injuries in such incidents. A Beijing cohort, consisting of paediatric patients, indicated potential child safety concerns regarding personal mobility device usage. Finally, a Shanghai cohort demonstrated the potential dangers of PMD battery chargers. The observed differences between those experiencing burn injuries and the broader population of personal mobility device riders in terms of age and gender suggest that younger males may be at higher risk, perhaps due to risky practices such as leaving personal mobility devices unattended whilst charging. This review emphasises the need for safety education, adherence to regulations, and responsible consumer choices to mitigate burn injuries. Recommendations include promoting child safety measures, using certified personal mobility devices, and cautious handling of DIY conversion kits. Further large-scale studies are essential to gain comprehensive insights and develop effective safety strategies to protect personal mobility device riders from burn injuries.

2.
Article in English | MEDLINE | ID: mdl-38830601

ABSTRACT

BACKGROUND: Treated or coated sutures promise to prevent contamination of wounds. PURPOSE: The purpose of the study was to coat surgical sutures with a new quaternary ammonium silane (QAS) antimicrobial compound at two different application temperatures and then to evaluate the resulting structural, physical, mechanical, and biological properties. STUDY DESIGN, SETTING, SAMPLE: In vitro and in vivo studies were conducted using male albino Wistar rats approved by the Joint Ethical Committee of IMU and Postgraduate Medical Institute, Lahore. Only suture samples, coated uniformly with verified presence of the compound and of adequate length were used. Samples which were not coated uniformly and with inadequate length or damaged were excluded. PREDICTOR VARIABLE: Predictor variables were sutures with and without QAS coatings and different temperatures. Sutures were coated with QAS at 0.5 and 1.0% wt/vol using the dip coating technique and sutures with and without QAS coating were tested at 25 and 40 °C temperatures. MAIN OUTCOME VARIABLE(S): Outcome variables of structural and physico-mechanical properties of QAS-coated and non-coated sutures were measured using Fourier transform infrared spectroscopy (for structural changes), confocal laser and scanning electron (for diameter changes), and tensile strength/modulus (for mechanical testing). Biologic outcome variables were tested (bacterial viability); macrophage cultures from Wistar rats were tested (M1/M2 polarization detecting IL-6 and IL-10). Macrophage cells were analyzed with CD80+ (M1) and CD163+ (M2). Chemotaxis index was calculated as a ratio of quantitative fluorescence of cells. COVARIATES: Not applicable. ANALYSES: Ordinal data among groups were compared using the Wilcoxon Mann-Whitney U test along with the comparison of histological analysis using the Wilcoxon Sign-rank test (P < .05). RESULTS: Fourier transform infrared spectroscopy peak at 1490 cm-1 confirmed the presence of QAS on suture's surfaces with a significant increase (P < .05) in diameter (0.99 ± 0.5-mm) and weight (0.77 ± 0.02-mg) observed for 1% QAS groups treated at 40 °C. Non-coated samples heated at 25 °C had significantly (P < .05) less diameters (0.22 ± 0.03-mm) and weights (0.26 ± 0.06-mg). Highest tensile strength/modulus was observed for 0.5% QAS-coated samples which also had significantly higher antibacterial characteristics than other sutures (P < .05). QAS-coated sutures significantly increased M1 and M2 markers. CONCLUSION AND RELEVANCE: QAS coating conferred antibacterial action properties without compromising the physical and mechanical properties of the suture.

3.
J Funct Biomater ; 15(3)2024 Mar 01.
Article in English | MEDLINE | ID: mdl-38535253

ABSTRACT

Three-dimensional printing (3DP) technology has revolutionized the field of the use of bioceramics for maxillofacial and periodontal applications, offering unprecedented control over the shape, size, and structure of bioceramic implants. In addition, bioceramics have become attractive materials for these applications due to their biocompatibility, biostability, and favorable mechanical properties. However, despite their advantages, bioceramic implants are still associated with inferior biological performance issues after implantation, such as slow osseointegration, inadequate tissue response, and an increased risk of implant failure. To address these challenges, researchers have been developing strategies to improve the biological performance of 3D-printed bioceramic implants. The purpose of this review is to provide an overview of 3DP techniques and strategies for bioceramic materials designed for bone regeneration. The review also addresses the use and incorporation of active biomolecules in 3D-printed bioceramic constructs to stimulate bone regeneration. By controlling the surface roughness and chemical composition of the implant, the construct can be tailored to promote osseointegration and reduce the risk of adverse tissue reactions. Additionally, growth factors, such as bone morphogenic proteins (rhBMP-2) and pharmacologic agent (dipyridamole), can be incorporated to promote the growth of new bone tissue. Incorporating porosity into bioceramic constructs can improve bone tissue formation and the overall biological response of the implant. As such, employing surface modification, combining with other materials, and incorporating the 3DP workflow can lead to better patient healing outcomes.

4.
Exp Cell Res ; 430(1): 113687, 2023 09 01.
Article in English | MEDLINE | ID: mdl-37356748

ABSTRACT

BACKGROUND: The ability of cancer cells to be invasive and metastasize depend on several factors, of which the action of protease activity takes center stage in disease progression. PURPOSE/OBJECTIVE: To analyze function of new K21 molecule in the invasive process of oral squamous cell carcinoma (OSCC) cell line. MATERIALS & METHODS: The Fusobacterium (ATCC 23726) streaks were made, and pellets were resuspended in Cal27 (ATCC CRL-2095) OSCC cell line spheroid cell microplate. Cells were seeded and Lysotracker staining performed for CathepsinK red channel. Cell and morphology were evaluated using Transmission Electron microscopy. Thiobarbituric acid assay was performed. OSCC was analyzed for Mic60. Raman spectra were collected from the cancer cell line. L929 dermal fibroblast cells were used for Scratch Assay. ELISA muti arrays were used for cytokines and matrix molecules. Internalization ability of fibroblast cells were also analyzed. Structure of K21 as a surfactant molecule with best docked poses were presented. RESULTS: Decrease in lysosomal staining was observed after 15 and 30 min of 0.1% treatment. Tumor clusters were associated with cell membrane destruction in K21 primed cells. There was functional silencing of Mic60 via K21, especially with 1% concentration with reduced cell migration and invasiveness. Raman intensity differences were seen at 700 cm-1, 1200 cm-1 and 1600 cm-1 regions. EVs were detected within presence of fibroblast cells amongst K21 groups. Wound area and wound closure showed the progress of wound healing. CONCLUSION: Over expression of CatK can be reduced by a newly developed targeted K21 based drug delivery system leading to reduced migration and adhesion of oral squamous cell carcinoma cells. The K21 drug formulation can have great potential for cancer therapies due to targeting and cytotoxicity effects.


Subject(s)
Carcinoma, Squamous Cell , Head and Neck Neoplasms , Mouth Neoplasms , Humans , Carcinoma, Squamous Cell/pathology , Mouth Neoplasms/pathology , Squamous Cell Carcinoma of Head and Neck , Cell Line, Tumor , Cell Proliferation , Cathepsin K , Cell Movement
5.
Materials (Basel) ; 16(4)2023 Feb 17.
Article in English | MEDLINE | ID: mdl-36837334

ABSTRACT

The aim of this study was to evaluate published data regarding riboflavin (RF) as a cross-linker for improved adhesive bond strength to dentin and to analyze previous studies for optimal concentration of riboflavin range suitable for dentin bond. Saliva and distilled water were used as storage media and aging time was 24 h and 6 months. Results of meta-analysis were synthesized using a statistical method of inverse variance in random effects with a 95% Confidence Interval (CI). Cochrane review manager 5.4.1 was used to determine results of the meta-analysis. In total, 3172 articles were found from search databases "PubMed", "Scopus", and "Google Scholar". Six of the fifteen studies were eligible for meta-analysis. Micro tensile strength shows significant improvement with the addition of riboflavin (p < 0.05) compared to without the addition of riboflavin from with 95% CI. A significant difference has been found in micro tensile bond strength between use of the riboflavin cross-linker and without use of the riboflavin crosslinker in the dentin adhesive system. With a 95% confidence interval (CI), the I2 for micro tensile strength was 89% with strong heterogeneity, Chi2 = 44.76, df = 5 (p < 0.00001), and overall effect size is Z = 2.22 (p = 0.03) after immediate aging. Chiang et al. 2013 shows maximum mean differences which is 38.50 [17.93-59.07]. After 6 months of aging in distilled water or artificial saliva micro tensile bond strength has been increased with the addition of riboflavin (p < 0.05). It can be clearly seen that pooled effect and 95% CI did not cross the line of no effect. With a 95% confidence interval (CI), the I2 for micro tensile strength was 96% with strong heterogeneity, Chi2 = 117.56, df = 5 (p < 0.00001), and overall effect size is Z = 2.30 (p = 0.02). Subgroup analysis proved a similar effect of distilled water and artificial saliva as storage media on micro tensile bond strength after incorporating riboflavin as a collagen crosslinker. An artificial saliva aged forest plot also showed considerable heterogeneity with I2 = 96%; Tau2 = 257.32; Chi2 = 94.37; df = 2 (p < 0.00001); test for overall effect, Z = 1.06 (p = 0.29). Riboflavin prior to or with bonding is recommended to improve the bonding of different adhesive systems.

6.
Burns ; 48(4): 1013-1018, 2022 06.
Article in English | MEDLINE | ID: mdl-34602298

ABSTRACT

Our regional burns service has gained experience in managing paediatric hand friction burns due to vacuum cleaners (VC). We aimed to evaluate our 10 year experience managing these injuries as well as reviewing national data trends in order to identify those at risk of injury. MATERIALS AND METHODS: A International Burns Injury Database (IBID) request was made to review the number of burn injuries recorded due to Vacuum cleaner injuries (VCIs). In addition, a local IBID request was made to identify the number of burn injuries managed within our regional burns service. RESULTS: We identified 288 VCIs which have increasingly occurred in England and Wales between 1996-2020 and 32 children who sustained these injuries within our regional burns service. A general theme from both national and local data highlighted that these injuries occurred in males (78%, n=25) with a mean age of 20 months (9 months-4.5 years) affecting children's hands (94%). In 25 cases (78%) these injuries involved an interphalangeal joint. 85% (n = 27) of injuries were deep dermal/full thickness with eleven children (34%) undergoing surgical excision and skin grafts. DISCUSSION: Significant paediatric burn injuries can be sustained from VCs. Greater awareness is indicated for these injuries and legislation should be considered in order to improve the safety of vacuum cleaners. International burn societies are urged to collect data of these injuries in order to co-ordinate improved prevention strategies and change within the VC industry.


Subject(s)
Burns , Pediatrics , Burns/epidemiology , Burns/therapy , Child , Friction , Humans , Infant , Male , Retrospective Studies , Skin Transplantation , Vacuum
10.
J Biomed Mater Res B Appl Biomater ; 108(6): 2670-2680, 2020 08.
Article in English | MEDLINE | ID: mdl-32159274

ABSTRACT

Bone grafting procedures are commonly used to manage bone defects in the craniofacial region. Monetite is an excellent biomaterial option for bone grafting, however, it is limited by lack of osteoinduction. Several molecules can be incorporated within the monetite matrix to promote bone regeneration. The aim was to investigate whether incorporating bone forming drug conjugates (C3 and C6) within monetite can improve their ability to regenerate bone in bone defects. Bilateral bone defects were created in the mandible of 24 Sprague-Dawley rats and were then packed with monetite control, monetite+C3 or monetite+C6. After 2 and 4 weeks, post-mortem samples were analyzed using microcomputed tomography, histology and back-scattered electron microscopy to calculate the percentages of bone formation and remaining graft material. At 2 and 4 weeks, monetite with C3 and C6 demonstrated higher bone formation than monetite control, while monetite+C6 had the highest bone formation percentage at 4 weeks. There were no significant differences in the remaining graft material between the groups at 2 or 4 weeks. Incorporating these anabolic drug conjugates within the degradable matrix of monetite present a promising bone graft alternative for bone regeneration and repair in orthopedic as well as oral and maxillofacial applications.


Subject(s)
Anabolic Agents/pharmacology , Bone Regeneration/drug effects , Calcium Phosphates/pharmacology , Mandible/abnormalities , Anabolic Agents/adverse effects , Anabolic Agents/chemistry , Animals , Bone Substitutes , Bone Transplantation/methods , Calcium Phosphates/adverse effects , Calcium Phosphates/chemistry , Graft Survival , Male , Osteogenesis/drug effects , Rats , Rats, Sprague-Dawley , X-Ray Microtomography
11.
J Periodontol ; 91(11): 1521-1531, 2020 11.
Article in English | MEDLINE | ID: mdl-32100284

ABSTRACT

BACKGROUND: Deproteinized bovine bone mineral (DBBM) has been extensively studied and used for bone regeneration in oral and maxillofacial surgery. However, it lacks an osteoinductive ability. We developed two novel bone anabolic conjugated drugs, known as C3 and C6, of an inactive bisphosphonate and a bone activating synthetic prostaglandin agonist. The aim was to investigate whether these drugs prebound to DBBM granules have the potential to achieve rapid and enhanced bone regeneration. METHODS: Bilateral defects (4.3 mm diameter circular through and through) were created in mandibular angles of 24 Sprague-Dawley rats were filled with DBBM Control, DBBM with C3 or DBBM with C6 (n = 8 defects per group/ each timepoint). After 2 and 4 weeks, postmortem samples were analyzed by microcomputed tomography followed by backscattering electron microscopy and histology. RESULTS: DBBM grafts containing the C3 and C6 conjugated drugs showed significantly more bone formation than DBBM control at 2 and 4 weeks. The C6 containing DBBM demonstrated the highest percentage of new bone formation at 4 weeks. There was no significant difference in the percentage of the remaining graft between the different groups at 2 or 4 weeks. CONCLUSIONS: DBBM granules containing conjugated drugs C3 and C6 induced greater new bone volume generated and increased the bone formation rate more than the DBBM controls. This is expected to allow the development of clinical treatments that provide more predictable and improved bone regeneration for bone defect repair in oral and maxillofacial surgery.


Subject(s)
Bone Substitutes , Pharmaceutical Preparations , Animals , Bone Regeneration , Bone Substitutes/pharmacology , Bone Substitutes/therapeutic use , Cattle , Membranes, Artificial , Minerals , Rats , Rats, Sprague-Dawley , X-Ray Microtomography
12.
J Pak Med Assoc ; 70(12(B)): S14-S17, 2020 Dec.
Article in English | MEDLINE | ID: mdl-33582716

ABSTRACT

OBJECTIVE: To determine the association between site and size of perforation of the tympanic membrane and the level of conductive hearing. METHODS: The cross-sectional study was conducted from November 2015 to October 2016 at Aga Khan University Hospital Karachi and comprised patients with tympanic membrane perforation without any other middle-ear disease. Karl-Storz Rigid Endoscope attached to a camera was used to take pictures of the tympanic membrane. Site of the perforation was determined using a vertical line to divide the membrane into two anterior and posterior halves. Size of the perforation was calculated as a percentage of the total membrane using Image J software. Data analysis was done using Stata 12. RESULTS: Of the 55 patients, 29(53%) were males and 26(47%) were females. The overall mean age was 33+/-15 years. With every 5% increase in the size of perforation, the hearing loss increased by 1 decibel. A difference of 5.5 decibels was noted between anterior and posterior perforations of similar size. CONCLUSION: Hearing loss increased with increase in the size of perforation.


Subject(s)
Endoscopes , Hearing Loss/etiology , Internship and Residency , Otolaryngology/education , Tympanic Membrane Perforation/diagnostic imaging , Adolescent , Adult , Cross-Sectional Studies , Female , Hearing Loss/diagnosis , Humans , Male , Middle Aged , Young Adult
13.
J Biomed Mater Res B Appl Biomater ; 108(1): 253-262, 2020 01.
Article in English | MEDLINE | ID: mdl-31009177

ABSTRACT

Calcium phosphate-based biomaterials are extensively used for bone replacement and regeneration in orthopedic, dental, and maxillofacial surgical applications. The injury induced by surgical implantation of bone replacement graft materials initiates a cascade of host responses, starting with blood-biomaterial contact, protein adsorption on the material surface, blood coagulation, and leukocyte responses. During the initial acute inflammatory response, polymorphonuclear neutrophils (PMNs) and monocytes, abundant circulating leukocytes of the myeloid lineage, are recruited to the site of inflammation. In addition to responding to pathogenic challenges, these cells respond to particulate substances within the body including crystals of monosodium urate (MSU). Host responses toward grafts impact short- and long-term success in tissue engineering and regenerative applications. Although multinucleated osteoclasts, formed by monocyte/macrophage fusion, are generally thought to be responsible for resorption of implant biomaterials, the ability of different biomaterials to trigger PMNs, which are invariably present at the early stages after implant surgery, and are abundant in the oral cavity, has never been tested. In this article, we present analysis of the response of human blood-derived PMNs and monocytes toward brushite, monetite, and calcium polyphosphate (CPP) biomaterial substrates and compare this to the response to MSU crystals, the latter serving as a positive control. Employing multicolor flow cytometry to look at PMN and monocyte cell surface markers of activation to gauge the response to different biomaterials, we found that both types of myeloid cells are highly activated after exposure to brushite, monetite, and MSU but not CPP. © 2019 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 108B:253-262, 2020.


Subject(s)
Biocompatible Materials/pharmacology , Bone Substitutes/pharmacology , Calcium Phosphates/pharmacology , Leukocytes/metabolism , Materials Testing , Polyphosphates/pharmacology , Humans , Osteoclasts/metabolism
15.
JBMR Plus ; 3(12): e10237, 2019 Dec.
Article in English | MEDLINE | ID: mdl-31844825

ABSTRACT

Pathological bone loss is a regular feature of postmenopausal osteoporosis, and the microstructural changes along with the bone loss make the individual prone to getting hip, spine, and wrist fractures. We have developed a new conjugate drug named C3, which has a synthetic, stable EP4 agonist (EP4a) covalently linked to an inactive alendronate (ALN) that binds to bone and allows physiological remodeling. After losing bone for 12 weeks, seven groups of rats were treated for 8 weeks via tail-vein injection. The groups were: C3 conjugate at low and high doses, vehicle-treated ovariectomy (OVX) and sham, C1 (a similar conjugate, but with active ALN at high dose), inactive ALN alone, and a mixture of unconjugated ALN and EP4a to evaluate the conjugation effects. Bone turnover was determined by dynamic and static histomorphometry; µCT was employed to determine bone microarchitecture; and bone mechanical properties were evaluated via biomechanical testing. Treatment with C3 significantly increased trabecular bone volume and vertebral BMD versus OVX controls. There was also significant improvement in the vertebral load-bearing abilities and stimulation of bone formation in femurs after C3 treatment. This preclinical research revealed that C3 resulted in significant anabolic effects on trabecular bone, and EP4a and ALN conjugation components are vital to conjugate anabolic efficacy. A combined therapy using an EP4 selective agonist anabolic agent linked to an inactive ALN is presented here that produces significant anabolic effects, allows bone remodeling, and has the potential for treating postmenopausal osteoporosis or other diseases where bone strengthening would be beneficial. © 2019 The Authors. JBMR Plus published by Wiley Periodicals, Inc. on behalf of American Society for Bone and Mineral Research.

16.
Int J Oral Maxillofac Implants ; 34(4): e51­e63, 2019.
Article in English | MEDLINE | ID: mdl-30716148

ABSTRACT

PURPOSE: Achieving successful and predictable alveolar ridge augmentation in the vertical dimension is extremely challenging. Several materials have been investigated to achieve vertical ridge augmentation; however, the results are highly unpredictable. The collaborative team presenting this research has developed brushite- and monetite-based grafts that incorporate in their matrix a novel bone anabolic conjugate (C3) of a bisphosphonate and a potent bone-activating EP4 receptor agonist. The study objective was to investigate the potential of these graft formulations to achieve rapid, enhanced, and clinically significant bone regeneration in the vertical dimension. MATERIALS AND METHODS: Brushite and monetite grafts were fabricated and characterized for phase purity, porosity, compressive strength, and microstructural morphology. They were implanted in 12 rabbit calvaria for 12 weeks. Each group (n = 6): brushite control, brushite with C3, monetite control, and monetite with C3. Postmortem samples were retrieved and processed for analysis. The percentage bone volume, vertical bone height gained, and graft resorption were calculated and assessed. RESULTS: The brushite and monetite grafts containing C3 integrated well onto the calvarial bone surface, with new bone extending through the graft area (36% and 80%, respectively), while the C3 lacking grafts showed decreased surface integration and bone infiltration (28% and 38%, respectively). The C3 containing brushite and monetite grafts demonstrated bone growth vertically (1.8 mm and 2.7 mm, respectively) and improved graft resorption. CONCLUSION: The brushite- and monetite-based grafts loaded with the C3 conjugate resulted in greater de novo bone formation in the vertical dimension when compared with the grafts without the drug. However, the monetite grafts produced much more and predictable vertical height gain than was achieved with brushite grafts. The advantages of this new graft drug formulation in future would be to provide more predictable vertical bone regeneration, which will ultimately benefit patients undergoing dental implant placement.


Subject(s)
Alveolar Ridge Augmentation , Calcium Phosphates , Skull , Animals , Bone Regeneration , Bone Transplantation , Dental Implantation, Endosseous , Rabbits
17.
J Periodontol ; 89(5): 586-595, 2018 05.
Article in English | MEDLINE | ID: mdl-29856488

ABSTRACT

BACKGROUND: Products of internal defense systems, like pro-inflammatory cytokines, reactive oxygen species, and leukocytes, are released which attack periodontal bacteria in periodontitis, but at the same time, lead to tissue destruction as well. We hypothesize that resveratrol derivative-rich melinjo seed extract (MSE), an edible plant extract that has antioxidant properties, should promote healing of periodontal bone loss and modulating immune-inflammatory systems that leads periodontal tissue destruction. METHODS: We used an experimentally induced periodontitis (EP) model in mice. Ligatures were placed first for development of EP (15 days). MSE was intraperitoneally administrated (0.001% (w/w)) to reverse bone loss that had already occurred in established EP and mice were then sacrificed (day 17, 20 and 22). RESULTS: Morphometric outcomes revealed lower bone-loss in the MSE groups compared to control. Immunohistochemistry assays demonstrated lower oxidative stress in MSE groups. MSE also inhibited M-CSF/sRANKL mediated osteoclast formation and down-regulated osteoclast activity. CONCLUSIONS: Treatment with MSE in EP actually caused healing of bone, and these effects are probably related to decreases in local oxidative damage and osteoclast activity. Given MSE's positive effects on osteodifferentiation as well, these findings suggest that MSE could be a useful therapeutic agent for the management of periodontitis.


Subject(s)
Alveolar Bone Loss , Periodontitis , Animals , Disease Models, Animal , Mice , Osteoclasts , Plant Extracts , Resveratrol
18.
Acta Biomater ; 73: 547-558, 2018 06.
Article in English | MEDLINE | ID: mdl-29660511

ABSTRACT

Titanium (Ti) dental implants are susceptible to bacterial infections and failure due to lack of proper epithelial seal. Epithelial cells establish a strong epithelial seal around natural teeth by the deposition of basal lamina (BL) proteins that adsorb on the tooth surface. This seal can even be re-established onto cementum or dentin following injury or periodontal therapy. However, it is unclear how tooth surfaces promote this cell attachment and protein adsorption. Understanding the interactions between BL proteins and epithelial cells with dentin and Ti will facilitate the development of implant surfaces that promote the formation of an epithelial seal and improve the success of periodontal therapy and wound healing on natural teeth. To study these interactions, we used a surface proteomic approach to decipher the adsorption profile of BL proteins onto Ti and dentin, and correlated these adsorption profiles with in vitro interactions of human gingival fibroblasts and epithelial cells. Results showed that dentin adsorbed higher amounts of key BL proteins, particularly laminin and nidogen-1, and promoted more favorable interactions with epithelial cells than Ti. Next, dentin specimens were deproteinized or partially demineralized to determine if its mineral or protein component was responsible for BL adsorption and cell attachment. Deproteinized (mineral-rich) and partially demineralized (protein-rich) dentin specimens revealed BL proteins (i.e. laminin and nidogen-1) and epithelial cells interact preferentially with dentinal proteins rather than dentin mineral. These findings suggest that, unlike Ti, dentin and, in particular, dentinal proteins have a selective affinity to BL proteins that enhance epithelial cell attachment. STATEMENT OF SIGNIFICANCE: It is remains unclear why natural teeth, unlike titanium dental implants, promote the formation of an epithelial seal that protects them against the external environment. This study used a surface screening approach to analyze the adsorption of proteins produced by epithelial tissues onto tooth-dentin and titanium surfaces, and correlate it with the behaviour of cells. This study shows that tooth-dentin, in particular its proteins, has a higher selective affinity to certain adhesion proteins, and subsequently allows more favourable interactions with epithelial cells than titanium. This knowledge could help in developing new approaches for re-establishing and maintaining the epithelial seal around teeth, and could pave the way for developing implants with surfaces that allow the formation of a true epithelial seal.


Subject(s)
Basement Membrane/chemistry , Dental Implants , Dentin/chemistry , Gingiva/physiology , Proteome , Titanium/chemistry , Adsorption , Biocompatible Materials/chemistry , Cell Adhesion , Cell Survival , Epithelial Cells/cytology , Humans , Microscopy, Confocal , Peptides/chemistry , Proteomics , Spectrum Analysis, Raman , Surface Properties , Tooth/physiology , Wound Healing
19.
Biomater Res ; 21: 9, 2017.
Article in English | MEDLINE | ID: mdl-28593053

ABSTRACT

Periodontal disease is categorized by the destruction of periodontal tissues. Over the years, there have been several clinical techniques and material options that been investigated for periodontal defect repair/regeneration. The development of improved biomaterials for periodontal tissue engineering has significantly improved the available treatment options and their clinical results. Bone replacement graft materials, barrier membranes, various growth factors and combination of these have been used. The available bone tissue replacement materials commonly used include autografts, allografts, xenografts and alloplasts. These graft materials mostly function as osteogenic, osteoinductive and/or osteoconductive scaffolds. Polymers (natural and synthetic) are more widely used as a barrier material in guided tissue regeneration (GTR) and guided bone regeneration (GBR) applications. They work on the principle of epithelial cell exclusion to allow periodontal ligament and alveolar bone cells to repopulate the defect before the normally faster epithelial cells. However, in an attempt to overcome complications related to the epithelial down-growth and/or collapse of the non-rigid barrier membrane and to maintain space, clinicians commonly use a combination of membranes with hard tissue grafts. This article aims to review various available natural tissues and biomaterial based bone replacement graft and membrane options used in periodontal regeneration applications.

20.
Eur J Dent ; 11(1): 135-140, 2017.
Article in English | MEDLINE | ID: mdl-28435381

ABSTRACT

After tooth loss, an individual may seek tooth replacement so that his/her function and esthetics could be restored. Clinical prosthodontics, during the past decade, has significantly improved and developed according to the advancements in the science and patient's demands and needs. Conventional options in prosthodontics for substituting a missing single tooth include the removable partial denture, partial and full coverage bridgework, and resin-bonded bridgework. Dental implants have gained increasing popularity over the years as they are capable of restoring the function to near normal in both partial and completely edentulous arches. With substantial evidence available, fixed implant-supported prosthesis are fully acknowledged as a reliable treatment option for the replacement of single or multiple missing teeth nowadays. While dental implants are increasingly becoming the choice of replacement for missing teeth, the impediments associated with them are progressively emerging too.

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