1
|
Selvakumar B, Sekar P, Samsudin AR. Intestinal macrophages in pathogenesis and treatment of gut leakage: current strategies and future perspectives. J Leukoc Biol 2024; 115:607-619. [PMID: 38198217 DOI: 10.1093/jleuko/qiad165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2023] [Revised: 11/13/2023] [Accepted: 12/08/2023] [Indexed: 01/12/2024] Open
Abstract
Macrophages play key roles in tissue homeostasis, defense, disease, and repair. Macrophages are highly plastic and exhibit distinct functional phenotypes based on micro-environmental stimuli. In spite of several advancements in understanding macrophage biology and their different functional phenotypes in various physiological and pathological conditions, currently available treatment strategies targeting macrophages are limited. Macrophages' high plasticity and diverse functional roles-including tissue injury and wound healing mechanisms-mark them as potential targets to mine for efficient therapeutics to treat diseases. Despite mounting evidence on association of gut leakage with several extraintestinal diseases, there is no targeted standard therapy to treat gut leakage. Therefore, there is an urgent need to develop therapeutic strategies to treat this condition. Macrophages are the cells that play the largest role in interacting with the gut microbiota in the intestinal compartment and exert their intended functions in injury and repair mechanisms. In this review, we have summarized the current knowledge on the origins and phenotypes of macrophages. The specific role of macrophages in intestinal barrier function, their role in tissue repair mechanisms, and their association with gut microbiota are discussed. In addition, currently available therapies and the putative tissue repair mediators of macrophages for treating microbiota dysbiosis induced gut leakage are also discussed. The overall aim of this review is to convey the intense need to screen for microbiota induced macrophage-released prorepair mediators, which could lead to the identification of potential candidates that could be developed for treating the leaky gut and associated diseases.
Collapse
Affiliation(s)
- Balachandar Selvakumar
- Department of Microbiota, Research Institute for Medical and Health Sciences, College of Medicine, University of Sharjah, University City Road, Sharjah, 27272, United Arab Emirates
| | - Priyadharshini Sekar
- Department of Microbiota, Research Institute for Medical and Health Sciences, College of Medicine, University of Sharjah, University City Road, Sharjah, 27272, United Arab Emirates
| | - A Rani Samsudin
- Department of Microbiota, Research Institute for Medical and Health Sciences, College of Medicine, University of Sharjah, University City Road, Sharjah, 27272, United Arab Emirates
- Department of Oral and Craniofacial Health Sciences, College of Dental Medicine, University of Sharjah, University City Road, Sharjah, 27272, United Arab Emirates
| |
Collapse
|
2
|
Al-Daghestani H, Qaisar R, Al Kawas S, Ghani N, Rani KGA, Azeem M, Hasnan HK, Kassim NK, Samsudin AR. Pharmacological inhibition of endoplasmic reticulum stress mitigates osteoporosis in a mouse model of hindlimb suspension. Sci Rep 2024; 14:4719. [PMID: 38413677 PMCID: PMC10899598 DOI: 10.1038/s41598-024-54944-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 02/19/2024] [Indexed: 02/29/2024] Open
Abstract
Hindlimb suspension (HLS) mice exhibit osteoporosis of the hindlimb bones and may be an excellent model to test pharmacological interventions. We investigated the effects of inhibiting endoplasmic reticulum (ER) stress with 4-phenyl butyrate (4-PBA) on the morphology, physicochemical properties, and bone turnover markers of hindlimbs in HLS mice. We randomly divided 21 male C57BL/6J mice into three groups, ground-based controls, untreated HLS group and 4-PBA treated group (HLS+4PBA) (100mg/kg/day, intraperitoneal) for 21 days. We investigated histopathology, micro-CT imaging, Raman spectroscopic analysis, and gene expression. Untreated HLS mice exhibited reduced osteocyte density, multinucleated osteoclast-like cells, adipocyte infiltration, and reduced trabecular striations on micro-CT than the control group. Raman spectroscopy revealed higher levels of ER stress, hydroxyproline, non-collagenous proteins, phenylalanine, tyrosine, and CH2Wag as well as a reduction in proteoglycans and adenine. Furthermore, bone alkaline phosphatase and osteocalcin were downregulated, while Cathepsin K, TRAP, and sclerostin were upregulated. Treatment with 4-PBA partially restored normal bone histology, increased collagen crosslinking, and mineralization, promoted anti-inflammatory markers, and downregulated bone resorption markers. Our findings suggest that mitigating ER stress with 4-PBA could be a therapeutic intervention to offset osteoporosis in conditions mimicking hindlimb suspension.
Collapse
Affiliation(s)
- Hiba Al-Daghestani
- Department of Oral and Craniofacial Health Sciences, College of Dental Medicine, University of Sharjah, Sharjah, 27272, UAE
| | - Rizwan Qaisar
- Department of Basic Medical Sciences, College of Medicine, University of Sharjah, Sharjah, 27272, UAE
- Space Medicine Research Group, Research Institute for Medical and Health Sciences, University of Sharjah, Sharjah, 27272, UAE
| | - Sausan Al Kawas
- Department of Oral and Craniofacial Health Sciences, College of Dental Medicine, University of Sharjah, Sharjah, 27272, UAE
| | - Nurhafizah Ghani
- School of Dental Sciences, Health Campus, Universiti Sains Malaysia, Kubang Kerian 16150, Kelantan, Malaysia
| | - K G Aghila Rani
- Research Institute for Medical and Health Sciences, University of Sharjah, Sharjah, 27272, UAE
| | - Muhammad Azeem
- Department of Mathematical and Physical Sciences, University of Nizwa, Nizwa 33, Sultanate of Oman
| | - Hijaz Kamal Hasnan
- Department of Geology, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Nur Karyatee Kassim
- School of Dental Sciences, Health Campus, Universiti Sains Malaysia, Kubang Kerian 16150, Kelantan, Malaysia.
| | - A R Samsudin
- Department of Oral and Craniofacial Health Sciences, College of Dental Medicine, University of Sharjah, Sharjah, 27272, UAE.
| |
Collapse
|
3
|
Qabbani AA, Rani KGA, AlKawas S, Abdul Hamid SS, Abdullah JY, Samsudin AR, Azlina A. Correction: Evaluation of the osteogenic potential of demineralized and decellularized bovine bone granules following implantation in rat calvaria critical-size defect model. PLoS One 2024; 19:e0298012. [PMID: 38271376 PMCID: PMC10810522 DOI: 10.1371/journal.pone.0298012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2024] Open
Abstract
[This corrects the article DOI: 10.1371/journal.pone.0294291.].
Collapse
|
4
|
Zreaqat M, Hassan R, Samsudin AR, Alforaidi S. Effects of twin-block appliance on upper airway parameters in OSA children with class II malocclusion and mandibular retrognathia: a CBCT study. Eur J Pediatr 2023; 182:5501-5510. [PMID: 37777602 DOI: 10.1007/s00431-023-05226-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 09/15/2023] [Accepted: 09/17/2023] [Indexed: 10/02/2023]
Abstract
Twin-block appliance had been advocated as a potential treatment option in paediatric obstructive sleep apnoea (OSA) due to their favourable effect in enhancing upper airway parameters and improving OSA symptoms. The aim of this study was to evaluate the effect of twin-block appliance therapy on upper airway parameters/dimensions and the apnoea-hypopnea indexes (AHIs) in OSA children with class II mandibular retrognathic skeletal malocclusion using cone-beam computed tomography. This prospective longitudinal study comprised 34 polysomnography-proven OSA growing children with class II mandibular retrognathic skeletal malocclusion between the ages of 8 and 12 years who had completed myofunctional twin-block therapy and matched corresponding controls. The upper airway was segmented into the nasopharynx, oropharynx, and hypopharynx, and the effect of twin-bock treatment on upper airway parameters/dimensions was assessed pre- and posttreatment using CBCT analysis, while a second standard overnight PSG was performed to determine changes in the AHI. At the nasopharynx level, minimal (nonsignificant) increases in all variables were observed within the twin-block group and between the groups (P > 0.05). At the level of the oropharynx, all variables increased significantly in the treatment group and between groups (P < 0.001), but these increases were nonsignificant in the control group. At the level of the hypopharynx, only the minimum cross-sectional area (MCA) increased significantly in the treatment group (P = 0.003). The change in MCA was also significant between the groups (P = 0.041). In addition, the upper airway length increased significantly in the twin-block group (P = 0.0154), and the AHI decreased by 74.8% (P < 0.001). CONCLUSION Correction of class II mandibular retrognathic skeletal malocclusion with twin-block appliance resulted in a significant increase in upper airway volume, MCA, anteroposterior and lateral distances of the MCA at the level of the oropharynx, MCA at the level of the hypopharynx and upper airway length, and a significant decrease in AHI, but it had no effect on nasopharynx parameters. WHAT IS KNOWN • CBCT imaging has been shown to be an effective and precise diagnostic tool for analyzing the upper airways and craniofacial structures. • Twin block appliance may be an effective treatment modality in children with OSA. WHAT IS NEW • Minimal cross-sectional area of upper ways may be the most relevant potential parameter when explaining how the upper airway anatomy plays role of in the pathogenesis of pediatric OSA. • Twin block appliance induced favorable changes in upper airway morphology (oropharynx area mainly) and respiratory parameters in OSA children with class II malocclusion.
Collapse
Affiliation(s)
- Maen Zreaqat
- Orthodontic Dep., School of Dental Sciences, Universiti Sains Malaysia, Kota Bharu, Malaysia
| | - Rozita Hassan
- Orthodontic Dep., School of Dental Sciences, Universiti Sains Malaysia, Kota Bharu, Malaysia.
| | - A R Samsudin
- Maxillofacial Surgery Dep., College of Dental Medicine, University of Sharjah, Sharjah, United Arab Emirates
| | - Sahal Alforaidi
- Pediatric and Orthodontic Dep. College of Dentistry, Taibah University, Medina, Saudi Arabia
| |
Collapse
|
5
|
Altaie AM, Mohammad MG, Madkour MI, AlSaegh MA, Jayakumar MN, K G AR, Samsudin AR, Halwani R, Hamoudi RA, Soliman SSM. Molecular pathogenicity of 1-nonadecene and L-lactic acid, unique metabolites in radicular cysts and periapical granulomas. Sci Rep 2023; 13:10722. [PMID: 37400519 DOI: 10.1038/s41598-023-37945-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Accepted: 06/30/2023] [Indexed: 07/05/2023] Open
Abstract
Recently, 1-nonadecene and L-lactic acid were identified as unique metabolites in radicular cysts and periapical granuloma, respectively. However, the biological roles of these metabolites were unknown. Therefore, we aimed to investigate the inflammatory and mesenchymal-epithelial transition (MET) effects of 1-nonadecene, and the inflammatory and collagen precipitation effects of L-lactic acid on both periodontal ligament fibroblasts (PdLFs) and peripheral blood mononuclear cells (PBMCs). PdLFs and PBMCs were treated with 1-nonadecene and L-lactic acid. Cytokines' expression was measured using quantitative real-time polymerase chain reaction (qRT-PCR). E-cadherin, N-cadherin, and macrophage polarization markers were measured using flow cytometry. The collagen, matrix metalloproteinase (MMP)-1, and released cytokines were measured using collagen assay, western blot, and Luminex assay, respectively. In PdLFs, 1-nonadecene enhances inflammation through the upregulation of some inflammatory cytokines including IL-1β, IL-6, IL-12A, monocyte chemoattractant protein (MCP)-1, and platelet-derived growth factor (PDGF) α. 1-Nonadecene also induced MET through the upregulation of E-cadherin and the downregulation of N-cadherin in PdLFs. 1-Nonadecene polarized macrophages to a pro-inflammatory phenotype and suppressed their cytokines' release. L-lactic acid exerted a differential impact on the inflammation and proliferation markers. Intriguingly, L-lactic acid induced fibrosis-like effects by enhancing collagen synthesis, while inhibiting MMP-1 release in PdLFs. These results provide a deeper understanding of 1-nonadecene and L-lactic acid's roles in modulating the microenvironment of the periapical area. Consequently, further clinical investigation can be employed for target therapy.
Collapse
Affiliation(s)
- Alaa M Altaie
- Research Institute for Medical and Health Sciences, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates
- Department of Clinical Sciences, College of Medicine, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates
| | - Mohammad G Mohammad
- Research Institute for Medical and Health Sciences, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates
- Department of Medical Laboratory Sciences, College of Health Sciences, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates
| | - Mohamed I Madkour
- Research Institute for Medical and Health Sciences, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates
- Department of Medical Laboratory Sciences, College of Health Sciences, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates
| | - Mohammed Amjed AlSaegh
- Research Institute for Medical and Health Sciences, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates
- Department of Oral and Craniofacial Health Sciences, College of Dental Medicine, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates
| | - Manju Nidagodu Jayakumar
- Research Institute for Medical and Health Sciences, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates
| | - Aghila Rani K G
- Research Institute for Medical and Health Sciences, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates
| | - A R Samsudin
- Research Institute for Medical and Health Sciences, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates
- Department of Oral and Craniofacial Health Sciences, College of Dental Medicine, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates
| | - Rabih Halwani
- Research Institute for Medical and Health Sciences, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates
- Department of Clinical Sciences, College of Medicine, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates
| | - Rifat A Hamoudi
- Research Institute for Medical and Health Sciences, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates.
- Department of Clinical Sciences, College of Medicine, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates.
- Division of Surgery and Interventional Science, University College London, London, United Kingdom.
- ASPIRE Precision Medicine Research Institute Abu Dhabi, University of Sharjah, Sharjah, United Arab Emirates.
| | - Sameh S M Soliman
- Research Institute for Medical and Health Sciences, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates.
- Department of Medicinal Chemistry, College of Pharmacy, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates.
| |
Collapse
|
6
|
Altaie AM, Mohammad MG, Madkour MI, Shakartalla SB, Jayakumar MN, K G AR, Halwani R, Samsudin AR, Hamoudi RA, Soliman SSM. The Essential Role of 17-Octadecynoic Acid in the Pathogenesis of Periapical Abscesses. J Endod 2023; 49:169-177.e3. [PMID: 36528175 DOI: 10.1016/j.joen.2022.12.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2022] [Revised: 11/27/2022] [Accepted: 12/02/2022] [Indexed: 12/15/2022]
Abstract
INTRODUCTION Periapical abscesses are 1 of the most frequent pathologic lesions in the alveolar bone. Recently, we have identified 17-octadecynoic acid (17-ODYA) as the highest unique metabolite in periapical abscesses. Therefore, the aim of this study was to investigate the immunologic and pathophysiological roles of this metabolite in the initiation and development of periapical abscesses. METHODS Periodontal ligament fibroblasts and peripheral blood mononuclear cells were treated with 17-ODYA. Gene expression analysis and interleukin (IL)-8 release were determined using quantitative real-time polymerase chain reaction and enzyme-linked immunosorbent assay. Macrophage polarization and cytokine release were also determined using flow cytometry and Luminex bioassay (R&D Systems, Minneapolis, MN), respectively. RESULTS In periodontal ligament fibroblasts, 17-ODYA caused significant (P < .0001) up-regulation of IL-1α, IL-1β, IL-6, matrix metalloproteinase-1, and monocyte chemoattractant protein-1 at 10 μmol/L after 6 days of treatment and up-regulation of platelet-derived growth factor alpha and vascular endothelial growth factor alpha at all tested concentrations after 2 days of treatment. In peripheral blood mononuclear cells, 17-ODYA significantly increased the expression of IL-1α, IL-1β, IL-6, matrix metalloproteinase-1, and monocyte chemoattractant protein-1 at 10 μmol/L (P < .0001) and vascular endothelial growth factor alpha and platelet-derived growth factor alpha at 1 μmol/L 17-ODYA (P < .0001). 17-ODYA polarized macrophages toward a proinflammatory phenotype (M1) and suppressed the release of pro- and anti-inflammatory cytokines. 17-ODYA significantly enhanced the release of IL-8. CONCLUSIONS This study was the first to identify the pathologic role of 17-ODYA in the development of periapical abscesses. The results of this study are important in shedding light on the pathogenesis of periapical abscesses in relation to microbial metabolites.
Collapse
Affiliation(s)
- Alaa M Altaie
- Research Institute for Medical and Health Sciences, University of Sharjah, Sharjah, United Arab Emirates; Department of Oral and Craniofacial Health Sciences, College of Dental Medicine, University of Sharjah, Sharjah, United Arab Emirates; Department of Clinical Sciences, College of Medicine, University of Sharjah, Sharjah, United Arab Emirates
| | - Mohammad G Mohammad
- Research Institute for Medical and Health Sciences, University of Sharjah, Sharjah, United Arab Emirates; Department of Medical Laboratory Sciences, College of Health Sciences, University of Sharjah, Sharjah, United Arab Emirates
| | - Mohamed I Madkour
- Research Institute for Medical and Health Sciences, University of Sharjah, Sharjah, United Arab Emirates; Department of Medical Laboratory Sciences, College of Health Sciences, University of Sharjah, Sharjah, United Arab Emirates
| | - Sarra B Shakartalla
- Research Institute for Medical and Health Sciences, University of Sharjah, Sharjah, United Arab Emirates; Department of Clinical Sciences, College of Medicine, University of Sharjah, Sharjah, United Arab Emirates
| | - Manju Nidagodu Jayakumar
- Research Institute for Medical and Health Sciences, University of Sharjah, Sharjah, United Arab Emirates
| | - Aghila Rani K G
- Research Institute for Medical and Health Sciences, University of Sharjah, Sharjah, United Arab Emirates
| | - Rabih Halwani
- Research Institute for Medical and Health Sciences, University of Sharjah, Sharjah, United Arab Emirates; Department of Clinical Sciences, College of Medicine, University of Sharjah, Sharjah, United Arab Emirates
| | - A R Samsudin
- Research Institute for Medical and Health Sciences, University of Sharjah, Sharjah, United Arab Emirates; Department of Oral and Craniofacial Health Sciences, College of Dental Medicine, University of Sharjah, Sharjah, United Arab Emirates
| | - Rifat A Hamoudi
- Research Institute for Medical and Health Sciences, University of Sharjah, Sharjah, United Arab Emirates; Department of Clinical Sciences, College of Medicine, University of Sharjah, Sharjah, United Arab Emirates; Division of Surgery and Interventional Science, University College London, London, United Kingdom.
| | - Sameh S M Soliman
- Research Institute for Medical and Health Sciences, University of Sharjah, Sharjah, United Arab Emirates; Department of Medicinal Chemistry, College of Pharmacy, University of Sharjah, Sharjah, United Arab Emirates.
| |
Collapse
|
7
|
Al Qabbani A, Rani KGA, Syarif J, AlKawas S, Sheikh Abdul Hamid S, Samsudin AR, Azlina A. Evaluation of decellularization process for developing osteogenic bovine cancellous bone scaffolds in-vitro. PLoS One 2023; 18:e0283922. [PMID: 37018321 PMCID: PMC10075422 DOI: 10.1371/journal.pone.0283922] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Accepted: 03/21/2023] [Indexed: 04/06/2023] Open
Abstract
Current immunological issues in bone grafting regarding the transfer of xenogeneic donor bone cells into the recipient are challenging the industry to produce safer acellular natural matrices for bone regeneration. The aim of this study was to investigate the efficacy of a novel decellularization technique for producing bovine cancellous bone scaffold and compare its physicochemical, mechanical, and biological characteristics with demineralized cancellous bone scaffold in an in-vitro study. Cancellous bone blocks were harvested from a bovine femoral head (18-24 months old) subjected to physical cleansing and chemical defatting, and further processed in two ways. Group I was subjected to demineralization, while Group II underwent decellularization through physical, chemical, and enzymatic treatments. Both were then freeze-dried, and gamma radiated, finally producing a demineralized bovine cancellous bone (DMB) scaffold and decellularized bovine cancellous bone (DCC) scaffold. Both DMB and DCC scaffolds were subjected to histological evaluation, scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS), fourier-transform infrared spectroscopy (FTIR), quantification of lipid, collagen, and residual nucleic acid content, and mechanical testing. The osteogenic potential was investigated through the recellularization of scaffolds with human osteoblast cell seeding and examined for cell attachment, proliferation, and mineralization by Alizarin staining and gene expression. DCC produced a complete acellular extracellular matrix (ECM) with the absence of nucleic acid content, wider pores with extensive interconnectivity and partially retaining collagen fibrils. DCC demonstrated a higher cell proliferation rate, upregulation of osteogenic differentiation markers, and substantial mineralized nodules production. Our findings suggest that the decellularization technique produced an acellular DCC scaffold with minimal damage to ECM and possesses osteogenic potential through the mechanisms of osteoconduction, osteoinduction, and osteogenesis in-vitro.
Collapse
Affiliation(s)
- Ali Al Qabbani
- Department of Oral & Craniofacial Health Sciences, College of Dental Medicine, University of Sharjah, Sharjah, United Arab Emirates
- Basic Science and Oral Biology Unit, School of Dental Sciences, Universiti Sains Malaysia, Kubang Kerian, Kelantan, Malaysia
| | - K G Aghila Rani
- Sharjah Institute for Medical Research, University of Sharjah, Sharjah, United Arab Emirates
| | - Junaidi Syarif
- Department of Nuclear and Mechanical Engineering, College of Engineering, University of Sharjah, Sharjah, United Arab Emirates
| | - Sausan AlKawas
- Department of Oral & Craniofacial Health Sciences, College of Dental Medicine, University of Sharjah, Sharjah, United Arab Emirates
| | - Suzina Sheikh Abdul Hamid
- Tissue Bank, School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian, Kelantan, Malaysia
| | - A R Samsudin
- Department of Oral & Craniofacial Health Sciences, College of Dental Medicine, University of Sharjah, Sharjah, United Arab Emirates
- Tissue Bank, School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian, Kelantan, Malaysia
| | - Ahmad Azlina
- Basic Science and Oral Biology Unit, School of Dental Sciences, Universiti Sains Malaysia, Kubang Kerian, Kelantan, Malaysia
| |
Collapse
|
8
|
AlHarthi MA, Soumya S, Rani A, Kheder W, Samsudin AR. Impact of exposure of human osteoblast cells to titanium dioxide particles in-vitro. J Oral Biol Craniofac Res 2022; 12:760-764. [PMID: 36124073 PMCID: PMC9482106 DOI: 10.1016/j.jobcr.2022.08.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2021] [Revised: 05/15/2022] [Accepted: 08/26/2022] [Indexed: 11/30/2022] Open
Abstract
Titanium Dental implant is the most successful treatment modality to replace missing teeth today. Although titanium is considered biologically biocompatible, strong, and corrosion-free, the risk of implant failure continues due to bone loss at the expense of optimum oral health. Current research points toward the presence of titanium dioxide (TiO2) particles leached from dental implant surface, which occurred due to mechanical and chemical insults on the surface. This study aimed to investigate the influence of TiO2 particles of different sizes leaching from implant surfaces on Human Osteoblast cells (HOB) in-vitro. Titanium dioxide particles in both nano (NPs) and micro (MPs) size and at different concentrations were introduced to human osteoblast cells with and without treatment with vitamin C. Production of ROS was measured using H2DCFDA cellular ROS Assay Kit and MCP-1 and IL-8 cytokines released were assayed at 24 h time point using ELISA technique. Results showed a dose dependent increase in ROS production following exposure of HOB to both nano and micro particles. MCP-1 and IL-8 were released and there was minimal difference between the amount generated by nano compared with micro size particles. Treatment of HOB with antioxidant vitamin C demonstrated a significant reduction in the generation of ROS. At the same time, MCP-1 release was reduced significantly for the 100 μg/mL TiO2 NPs and MPs after Vitamin C treatment while IL-8 release increased significantly. This study suggests a positive role played by antioxidants in the control of ROS generation and chemokines production in the peri-implant tissue environment.
Collapse
Affiliation(s)
- Mariam Ali AlHarthi
- College of Dental Medicine, Sharjah Institute for Medical Research, United Arab Emirates
| | - S Soumya
- University of Sharjah, Sharjah Institute for Medical Research, United Arab Emirates
| | - Aghila Rani
- University of Sharjah, Sharjah Institute for Medical Research, United Arab Emirates
| | - Waad Kheder
- College of Dental Medicine, Sharjah Institute for Medical Research, United Arab Emirates
| | - A R Samsudin
- College of Dental Medicine, Sharjah Institute for Medical Research, United Arab Emirates
| |
Collapse
|
9
|
Zreaqat M, Hassan R, Samsudin AR, Stas Y, Hanoun A. Tonsil Size and Mallampati Score as Clinical Predictive Factors for Obstructive Sleep Apnea Severity in Children. J Contemp Dent Pract 2021; 22:850-853. [PMID: 34615793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
AIM AND OBJECTIVE The aim of this study was to determine the clinical utility of body mass index (BMI), tonsil size, and Mallampati scoring in predicting both the presence of and severity of pediatric obstructive sleep apnea (OSA). MATERIALS AND METHODS This prospective cross-sectional study comprised 78 growing children in the age range of 11-14 years with polysomnography (PSG)-proven OSA and 86 non-OSA corresponding controls. BMI, tonsil size (Friedman grading scale), and Mallampati score were determined for both groups, and related differences were assessed with a t-test, while their independent association with OSA severity was tested with a regression analysis. Statistical significance was set at p <0.05. RESULTS Male gender, BMI, tonsil size, and Mallampati score were significantly higher in the OSA group (p < 0.05). A significant correlation was recorded between the Mallampati score and OSA severity (p < 0.01), but not with BMI or tonsil size (p > 0.05). For every 1-point increase in the Mallampati scale, the apnea-hypopnea index (AHI) increased by more than five events per hour in the bivariate analysis and by more than three events per hour in the multivariate analysis. CONCLUSION Male gender, increased BMI, high tonsil, and Mallampati scores were clinical indicators of the presence of OSA. However, only Mallampati scale had a significant association with OSA severity. Clinical diagnostic indicators should be established and encouraged especially in community-based studies. CLINICAL SIGNIFICANCE Clinical diagnostic indicators are very useful in examining and screening children who are at risk of developing OSA as PSG is expensive and unsuitable for universal use in the pediatric population.
Collapse
Affiliation(s)
- Maen Zreaqat
- Orthodontic Department, School of Dental Sciences, Universiti Sains Malaysia, Kota Bharu, Malaysia
| | - Rozita Hassan
- Orthodontic Department, School of Dental Sciences, Universiti Sains Malaysia, Kota Bharu, Malaysia, Phone: +0060199886161, e-mail:
| | - A R Samsudin
- Oraland Maxillofacial Surgery Department, University of Sharjah, Sharjah, United Arab Emirates
| | - Yasser Stas
- Orthodontic Department, School of Dental Sciences, Universiti Sains Malaysia, Kota Bharu, Malaysia
| | - Abdulfatah Hanoun
- Orthodontic Department, School of Dental Sciences, Universiti Sains Malaysia, Kota Bharu, Malaysia
| |
Collapse
|
10
|
Kheder W, Soumya S, Samsudin AR. Impact of titanium dioxide particle size on macrophage production of intracellular reactive oxygen species. Arch Oral Biol 2021; 127:105133. [PMID: 33933922 DOI: 10.1016/j.archoralbio.2021.105133] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Revised: 04/18/2021] [Accepted: 04/19/2021] [Indexed: 11/26/2022]
Abstract
OBJECTIVES The aim of this study was to investigate the response of THP-1 monocyte-derived macrophages following exposure to titanium dioxide nanoparticles (TiO2 NPs) and microparticles (TiO2 MPs) in an in vitro system. DESIGN THP-1 monocytes were maintained in RPMI medium and transformed into M0 macrophages using Phorbol 12-myristate 13-acetate (PMA). TiO2 particle size characterization was performed using scanning electron microscopy (SEM) and dynamic light scattering (DLS) technology. A viability study using an XTT assay was performed by treating THP-1-derived macrophages with TiO2 NPs (<100 nm) and TiO2 MPs (<5 μm) at concentrations ranging from 100, 50, 25, 12.5, 6.25 and 3.125 μg/mL. Macrophages were then treated with three different concentrations of NPs and MPs (5, 20 or 100 μg/mL) for 24 h, and ROS production and TiO2 particle cellular uptake were measured using ROS assays and flow cytometry, respectively. RESULTS There was no significant change in the viability of THP-1 monocytes after treatment with TiO2 NPs and MPs. The uptake of both particles was confirmed and showed an increase in ROS generation, and the MPs produced more ROS than NPs. The increase in ROS generation with NPs was concentration-dependent. CONCLUSION Uptake of TiO2 NPs and MPs in macrophages at subcytotoxic levels generate ROS in a size- and dose-dependent manner.
Collapse
Affiliation(s)
- Waad Kheder
- College of Dental Medicine, University of Sharjah, United Arab Emirates.
| | - S Soumya
- Sharjah Institute for Medical Research, University of Sharjah, United Arab Emirates.
| | - A R Samsudin
- College of Dental Medicine, University of Sharjah, United Arab Emirates.
| |
Collapse
|
11
|
Kamal A, Salman B, Ar NH, Samsudin AR. Management of dry socket with low-level laser therapy. Clin Oral Investig 2020; 25:1029-1033. [PMID: 32562076 DOI: 10.1007/s00784-020-03393-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Accepted: 06/03/2020] [Indexed: 11/28/2022]
Abstract
OBJECTIVE The aim of this study is to investigate the efficacy of delivering low-level laser therapy (LLLT) in the management of dry socket at University Dental Hospital Sharjah. MATERIALS AND METHOD Forty-five patients with dry socket were divided into two treatment groups. Group I dry socket patients (n = 30) received conventional treatment while group II patients (n = 15) were irradiated with LLLT at a setting of 200-mW, 6-J, continuous-wave mode using an R02 tipless handpiece (Fotona Er:YAG, Europe), on the buccal, lingual, and middle surfaces of the socket for 30 s from a delivery distance of 1 cm. Pain score and quantification of granulation tissue in the socket were recorded at 0, 4, and 7 days post-dry socket treatment. RESULTS Results showed that the LLLT-irradiated group II sockets showed a much lower VAS pain score of 1-2 as early as day 4, and a richer amount of granulation tissue compared to the conventional treated group I socket. The amount and rate of granulation tissue formation in the dry socket are inversely proportional to the pain score showing significant clinical effectiveness of LLLT on promoting the healing of the dry socket, with improvement in symptoms (P = .001). Conventionally treated dry sockets take at least 7 days to match the effective healing of an LLLT-irradiated dry socket. CONCLUSION LLLT irradiation influences biomodulation of dry socket healing by dampening inflammation, promoting vascularization, stimulating granulation, and controlling pain symptoms. CLINICAL RELEVANCE LLLT may be an additional effective tool for managing dry sockets in general dental practice.
Collapse
Affiliation(s)
- Aqsa Kamal
- College of Dental Medicine, University of Sharjah, Sharjah, United Arab Emirates.,School of Dental Sciences, Universiti Sains Malaysia, George Town, Malaysia
| | - Basheer Salman
- College of Dental Medicine, University of Sharjah, Sharjah, United Arab Emirates
| | - Noor Hayatie Ar
- School of Dental Sciences, Universiti Sains Malaysia, George Town, Malaysia
| | - A R Samsudin
- College of Dental Medicine, University of Sharjah, Sharjah, United Arab Emirates.
| |
Collapse
|
12
|
Al Qabbani A, Al Kawas S, Enezei H, Razak NHA, Al Bayatti SW, Samsudin AR, Hamid SAB. Biomechanical and radiological assessment of immediate implants for alveolar ridge preservation. Dent Res J (Isfahan) 2018; 15:420-429. [PMID: 30534170 PMCID: PMC6243806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND The aim of this study was to evaluate the stability of immediate implant placement for alveolar bone augmentation and preservation with bovine bone graft following atraumatic tooth extraction. MATERIALS AND METHODS This was a prospective interventional study with convenient sampling (n = 10). Thirty patients aged between 18 and 40 years, who needed noncomplicated tooth extraction of mandibular premolar tooth, were sequentially divided equally into three groups. In Group I, simple extraction was done and the empty extraction socket left to heal conventionally. In Group II, extraction sockets were filled with lyophilized bovine granules only. In Group III, immediate implants were placed into extraction sockets, and the buccal gap was also filled with bovine granules. All groups were subjected to cone beam computed tomography scan for radiological evaluation. Assessment of biomechanical stability (radiofrequency analysis [RFA] was performed at 9 months postoperative for Group III to assess the degree of secondary stability of the implants using Osstell. Repeated measure analysis of variance (ANOVA) test was applied when comparing within each group at three different time intervals, whereas one-way ANOVA was applied followed by post hoc-tukey test when comparing between groups. P < 0.05 was considered statistically significant. RESULTS Radiological assessment reveals a significant difference of bone resorption in alveolar dimension within Group I; 1.49 mm (P = 0.002), and 0.82 mm (P = 0.005), respectively, between day 0 and 3 months. Comparison between Group I and III showed a highly significant difference of bone resorption in ridge width at 3 months 2.56 mm (P = 0.001) and at 9 months interval 3.2 mm (P < 0.001). High RFA values demonstrating an excellent biomechanical stability were observed in Group III at 9 months postoperatively. CONCLUSION The insertion of immediate implants in extraction sockets with bovine bone augmentation of the buccal gap was able to preserve a greater amount of alveolar ridge volume.
Collapse
Affiliation(s)
- Ali Al Qabbani
- Department of Oral and Craniofacial Health Science, College of Dental Medicine, University of Sharjah, Sharjah, UAE
- Sharjah Institute for Medical Research, University of Sharjah, Sharjah, UAE
- Department of Oral and Maxillofacial Surgery, School of Dental Sciences, Universiti Sains Malaysia, Malaysia
| | - Sausan Al Kawas
- Department of Oral and Craniofacial Health Science, College of Dental Medicine, University of Sharjah, Sharjah, UAE
- Sharjah Institute for Medical Research, University of Sharjah, Sharjah, UAE
| | - Hamid Enezei
- Department of Oral and Maxillofacial Surgery College of Dentistry, Anbar University, Ramadi, Iraq
| | - Noor Hayati A. Razak
- Department of Oral and Maxillofacial Surgery, School of Dental Sciences, Universiti Sains Malaysia, Malaysia
| | - Saad Wahby Al Bayatti
- Department of Oral and Craniofacial Health Science, College of Dental Medicine, University of Sharjah, Sharjah, UAE
| | - A. Rani Samsudin
- Department of Oral and Craniofacial Health Science, College of Dental Medicine, University of Sharjah, Sharjah, UAE
- Sharjah Institute for Medical Research, University of Sharjah, Sharjah, UAE
- Department of Oral and Maxillofacial Surgery, School of Dental Sciences, Universiti Sains Malaysia, Malaysia
| | - Suzina A. B. Hamid
- Department of Oral and Craniofacial Health Science, College of Dental Medicine, University of Sharjah, Sharjah, UAE
| |
Collapse
|
13
|
Gopinath VK, Musa M, Samsudin AR, Sosroseno W. Role of interleukin-1β and tumour necrosis factor-α on hydroxyapatite-induced phagocytosis by murine macrophages (RAW264.7 cells). Br J Biomed Sci 2018; 63:176-8. [PMID: 17201208 DOI: 10.1080/09674845.2006.11978094] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- V K Gopinath
- School of Dental Sciences, Universiti Sains Malaysia, 16150 Kota Bharu, Malaysia.
| | | | | | | |
Collapse
|
14
|
Hashim H, Samsudin AR. Do the symptoms of obstructive sleep apnea syndrome exist in highly trained Malay security personnel? Oral Health Dent Manag 2014; 13:336-340. [PMID: 24984644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
OBJECTIVE Obstructive Sleep Apnea Syndrome (OSAS) has been associated with excessive daytime sleepiness, which may lead to reduced alertness. This study determines the distribution of OSAS among highly trained Malay male security personnel, an occupation that requires constant alertness. METHODS Berlin questionnaires (Malay version) were distributed and the body mass index (BMI) and neck circumference were measured. This questionnaire asked for symptoms indicative of OSAS and consists of three categories: snoring, excessive daytime sleepiness/fatigue, and the presence of obesity or hypertension. RESULTS In total, 661 respondents were involved in this study. There was a range of prevalence of the main symptoms of OSAS with 45 subjects (6.8%, 95%CI: 5.0-9.0) categorized in the high risk group for OSAS. There was no significant difference in age, but the BMI and neck circumference were significantly higher in the high risk group (p<0.001). CONCLUSION The presence of OSAS symptoms in highly trained security personnel found in this study suggests the need to screen for this syndrome in individuals involved in high risk occupations.
Collapse
Affiliation(s)
- H Hashim
- Advanced Medical and Dental Institute, Universiti Sains Malaysia, 13200 Kepala Batas Penang, Malaysia, Tel: 604-5622391; Fax: 604-5622349; e-mail:
| | | |
Collapse
|
15
|
Banabilh SM, Samsudin AR, Suzina AH, Dinsuhaimi S. Facial profile shape, malocclusion and palatal morphology in Malay obstructive sleep apnea patients. Angle Orthod 2010; 80:37-42. [PMID: 19852637 DOI: 10.2319/011509-26.1] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVE To test the null hypothesis that there is no difference in facial profile shape, malocclusion class, or palatal morphology in Malay adults with and without obstructive sleep apnea (OSA). MATERIALS AND METHODS Subjects were 120 adult Malays aged 18 to 65 years (mean +/- standard deviation [SD], 33.2 +/- 13.31) divided into two groups of 60. Both groups underwent clinical examination and limited channel polysomnography (PSG). The mean OSA and control values were subjected to t-test and the chi square test. RESULTS Physical examination showed that 61.7% of the OSA patients were obese, and 41.7% of those obese patients had severe OSA. The mean body mass index (BMI) was significantly greater for the OSA group (33.2 kg/m2 +/- 6.5) than for the control group (22.7 kg/m2 +/- 3.5; P < .001). The mean neck size and systolic blood pressure were greater for the OSA group (43.6 cm +/- 6.02; 129.1 mm Hg +/- 17.55) than for the control group (35.6 cm +/- 3.52; 114.1 mm Hg +/- 13.67; P < .001). Clinical examination showed that the most frequent findings among OSA groups when compared with the control group were convex profiles (71.7%), Class II malocclusion (51.7%), and V palatal shape (53.3%), respectively; the chi square test revealed a significant difference in terms of facial profile and malocclusion class (P < .05), but no significant difference in palatal shape was found. CONCLUSION The null hypothesis is rejected. A convex facial profile and Class II malocclusion were significantly more common in the OSA group. The V palatal shape was a frequent finding in the OSA group.
Collapse
Affiliation(s)
- S M Banabilh
- School of Dental Sciences, Health Campus, Universiti Sains Malaysia, Kota Bahru, Kelantan, Malaysia.
| | | | | | | |
Collapse
|
16
|
Fazan F, Besar I, Osman A, Samsudin AR, Khalid KA. Successful commercialisation of locally fabricated bioceramics for clinical applications. Med J Malaysia 2008; 63 Suppl A:49-50. [PMID: 19024978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
This paper chronicled the development of a locally produced bone graft substitute based on calcium phosphate bioceramics called "GranuMaS--from concepts to clinics, and finally to its successful commercialization all within 5-year duration. It was a Prioritized Research (PR) collaborative project of 5 institutions namely SIRIM, ANM, USM, UKM and IIUM, funded by MOSTI to the amount of approximately RM2.5 millions under RM8. This paper also highlighted the requirements needed in terms of technical expertise/manpower, facilities and infrastructure, and government/institutional supports, as well as the challenge faced in developing and commercializing such product.
Collapse
Affiliation(s)
- F Fazan
- Advanced Materials Research Centre (AMREC), SIRIM Berhad, Malaysia
| | | | | | | | | |
Collapse
|
17
|
Baharudin A, Samsudin AR, Halim AS, Shafie MA. Surgical management of a massive facial hemangioma. Med J Malaysia 2007; 62:254-255. [PMID: 18246921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Hemangiomas are the most common congenital lesions in man and occur predominantly in the head and neck region. Massive hemangioma especially near vital organs or structures pose a challenge to surgeons. With the availability of expertise in embolization of feeding vessel of the hemangioma and reconstructive techniques we were able to manage successfully a complicated case of massive facial hemangioma.
Collapse
Affiliation(s)
- A Baharudin
- Department of Otorhinolaryngology-Head and Neck Surgery, School of Medical Sciences, Universiti Sains Malaysia, 16150 Kubang Kerian, Kelantan
| | | | | | | |
Collapse
|
18
|
Gopinath VK, Musa M, Samsudin AR, Sosroseno W. Role of protein kinase C in hydroxyapatite- induced phagocytosis by a murine macrophage cell line (RAW264.7). Immunopharmacol Immunotoxicol 2006; 28:485-9. [PMID: 16997796 DOI: 10.1080/08923970600928148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
The role of protein kinase C (PKC) in hydroxyapatite (HA)-induced phagocytosis by RAW 264.7 cells was investigated. The cells were incubated with HA particles at various incubation time and the levels of PKC activity were determined from the cell lysate. To determine the role of PKC, particles were incubated with the cells pretreated with the various concentrations of bisindolylmaleimide, a PKC inhibitor, and phagocytosis was then assessed at 60 min. Latex beads were used as a control. Our results showed that following incubation with HA particles, the levels of PKC activity in RAW264.7 cells was highest at 7 min and then decreased to reach the baseline levels of the controls at 30 min. Pretreatment of the cells with bisindolylmaleimide significantly reduced phagocytosis of HA particles in a dose-dependent pattern. The results of our present study suggest therefore that ingestion of HA by RAW264.7 cells may depend on PKC activity that may act in the early stages of phagocytosis.
Collapse
Affiliation(s)
- V K Gopinath
- School of Dental Sciences, Universiti Sains Malaysia, Kota Bharu, Malaysia.
| | | | | | | |
Collapse
|
19
|
Gopinath VK, Musa M, Samsudin AR, Lalitha P, Sosroseno W. Role of nitric oxide in hydroxyapatite-induced phagocytosis by murine macrophage cell line (RAW264.7). Arch Oral Biol 2006; 51:339-44. [PMID: 16214104 DOI: 10.1016/j.archoralbio.2005.08.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2005] [Revised: 08/22/2005] [Accepted: 08/30/2005] [Indexed: 10/25/2022]
Abstract
The aim of this study was to determine the role of nitric oxide (NO) in hydroxyapatite (HA)-induced phagocytosis by a murine macrophage cell line (RAW264.7). The cells were incubated with HA particles at various incubation time and phagocytosis was assessed using phagocytic index (PI). NO production from the culture supernatants was determined by the Griess reagent. The inducible nitric oxide synthase (iNOS) expression was determined by Western blot. The particles were also incubated with cells pretreated with various concentrations of L-N(6)-(1-iminoethyl) lysine hydrochloride (L-NIL) or L-arginine. Latex beads were used as a control. Our results showed that macrophage phagocytosis induced by HA was higher than that induced by the beads. However, NO production by HA-stimulated cells was lower than that by bead-stimulated cells. iNOS expression in both bead- and HA-stimulated cells was observed expressed at 7, 15, 30, and 60 min. l-Arginine enhanced but l-NIL inhibited both phagocytosis and NO production by HA-stimulated cells. The results of the present study suggest that nitric oxide may play a crucial role in HA-induced phagocytosis by RAW264.7 cells.
Collapse
Affiliation(s)
- V K Gopinath
- School of Dental Sciences, Universiti Sains Malaysia, 16150 Kota Bharu, Malaysia.
| | | | | | | | | |
Collapse
|
20
|
Banabilh SM, Rajion ZA, Samsudin AR, Singh GD. Facial soft tissue features assessed with finite element analysis. Int J Orthod Milwaukee 2006; 17:17-20. [PMID: 17256439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Facial soft tissues are a major determinant of treatment choice. When Class I and Class II malocclusions were compared using finite-element analysis, morphologic differences were localized and quantified. This study highlights the importance of determining the timing, magnitude and direction offacial growth prior to treatment to achieve stable results.
Collapse
Affiliation(s)
- Saeed M Banabilh
- School of Dental Sciences, Universiti Sains Malaysia, Kelantan, Malaysia
| | | | | | | |
Collapse
|
21
|
Harvinder S, Hassan S, Sidek DS, Hamzah M, Samsudin AR, Philip R. Underlay myringoplasty: comparison of human amniotic membrane to temporalis fascia graft. Med J Malaysia 2005; 60:585-9. [PMID: 16515109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Human amniotic membrane as a homograft material was compared to temporalis fascia to close tympanic membrane perforations in 50 patients with chronic otitis media. Human amniotic membrane was used in 20 patients while temporalis fascia was used in the remaining 30. Anatomical closure of the perforation and reduction of the air-bone gap was measured. The graft uptake showed a 65% success rate for the amniotic membrane and 56.7% for the temporalis fascia at 3 months post-operatively. Significant closure of air-bone gap was observed in the human amniotic group. These results indicate comparable outcomes between human amniotic membrane and the temporalis fascia graft.
Collapse
Affiliation(s)
- S Harvinder
- Department of ORL & HNS, School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian, Kelantan, Jabatan ENT, Hospital Ipoh, Jalan Hospital, 30990, Ipoh, Perak
| | | | | | | | | | | |
Collapse
|
22
|
Zamzuri I, Abdullah JM, Samsudin AR. Congenital nasal encephalocele--a review of surgical techniques. Med J Malaysia 2004; 59:552-4. [PMID: 15779595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
We report a case of a 6 month old baby boy who had congenital nasal encephalocele, repaired via the traditional staging procedure. The surgical techniques and procedures are described and discussed.
Collapse
Affiliation(s)
- I Zamzuri
- School of medical sciences, Universiti Sains Malaysia, Malaysia, 16150 Kubang Kerian, Kelantan
| | | | | |
Collapse
|
23
|
Kannan TP, Nik Ahmad Shah NL, Azlina A, Samsudin AR, Narazah MY, Salleh M. Chromosome aberration test for hydroxyapatite in sheep. Med J Malaysia 2004; 59 Suppl B:168-9. [PMID: 15468871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
The present study is aimed at finding the mutagenicity and cytotoxicity of dense form of synthetic hydroxyapatite (Source: School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia) in the blood of sheep. The biomaterial was implanted in the tibia of Malin, an indigenous sheep breed of Malaysia. Blood was collected from the sheep before implantation of the biomaterial, cultured and a karyological study was made. Six weeks after implantation, blood was collected from the same animal, cultured and screened for chromosome aberrations. The mitotic indices and karyological analysis indicated that the implantation of synthetic hydroxyapatite (dense form) did not produce any cytotoxicity or chromosome aberrations in the blood of sheep.
Collapse
Affiliation(s)
- T P Kannan
- School of Dental Sciences, Universiti Sains Malaysia, Health Campus, 16150 Kubang Kerian, Kelantan, Malaysia
| | | | | | | | | | | |
Collapse
|
24
|
Raouf AA, Samsudin AR, Al-Joudi FS, Shamsuria O. Biocompatibility test of polyhydroxybutyrate on human cell line. Med J Malaysia 2004; 59 Suppl B:101-2. [PMID: 15468838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
The human fibroblast MRC-5 cells incubated with PHB granules (TM) added at a final concentration of 4 mg/ml showed a time-course pattern of survival. The percentages of dead cells obtained were at the rate of 3.8% after 7 days, respectively. When the MRC-5 cells grown in different material, using the test concentration of 4 mg/ml PCM, they were found to show a similar time-course increasing pattern of death as that obtained with PHB. However, the death was noted in the cells incubated for 7 days, the death rates obtained was 40.54% respectively.
Collapse
Affiliation(s)
- A A Raouf
- School of Dental Sciences, Universiti Sains Malaysia Health Campus, 16150 Kubang Kerian, Kelantan, Malaysia
| | | | | | | |
Collapse
|
25
|
Kannan TP, Nik Ahmad Shah NL, Azlina A, Samsudin AR, Narazah MY, Salleh M. In vivo chromosome aberration test for hydroxyapetite in mice. Med J Malaysia 2004; 59 Suppl B:115-6. [PMID: 15468845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
This study evaluates the cytotoxic and mutagenic effect of synthetic hydroxyapatite granules (source: School of Material and Mineral Resources Engineering, Universiti Sains Malaysia) in the bone marrow cells of mice. Mice are exposed to synthetic hydroxyapatite granules, the bone marrow cells are collected and observed for chromosome aberrations. No chromosome aberrations were noticed in the animals exposed to distilled water (negative control) and to the test substance, synthetic hydroxyapatite granules (treatment) groups. Chromosome aberrations were observed in the animals exposed to Mitomycin C (positive control group). There was no indication of cytotoxicity due to synthetic hydroxyapatite granules in the animals as revealed by the mitotic index. Hence, synthetic hydroxyapatite granules are considered non-mutagenic under the prevailing test conditions.
Collapse
Affiliation(s)
- T P Kannan
- School of Dental Sciences, Universiti Sains Malaysia Health Campus, 16150 Kubang Kerian, Kelantan, Malaysia
| | | | | | | | | | | |
Collapse
|
26
|
Najafpour HD, Suzina AH, Nizam A, Samsudin AR. A comparative study of osseointegration phenomenon in coated and non-coated NiTi implants in a rabbit model. Med J Malaysia 2004; 59 Suppl B:121-2. [PMID: 15468848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
There was a significant increased in Absolute Contact Length measurements of endosteal bone growth along the Nickel-Titanium (NiTi) implant coated with the natural coral powder and Hydroxyapatite (HA) compared to the non-calcium coated implants. This study demonstrated that coated implants seemed to show earlier and higher osseointergration phenomena compared to non coated ones. Furthermore, there was significantly greater bone-to-implant contact at the apical 1/3rd of the coated implants.
Collapse
Affiliation(s)
- H D Najafpour
- School of Dental Sciences, Universiti Sains Malaysia Health Campus, Kubang Kerian, Kelantan
| | | | | | | |
Collapse
|
27
|
Nizam A, Mohamed SH, Arifin A, Mohd Ishak ZA, Samsudin AR. Tensile strength and water absorption of alumina filled poly (methyl methacrylate) denture base material. Med J Malaysia 2004; 59 Suppl B:145-6. [PMID: 15468860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
The aim of this study was to evaluate the tensile properties and water absorption of denture base material prepared from high molecular weight poly methyl methacrylate (PMMA) and alumina (Al2O3) as particulate filler. Specimens for mechanical testing were prepared by adding composite powder to the monomer followed by hand mixing as in dental laboratory procedure. The tensile strength of the prepared denture base material was slightly higher than commercial denture base material, while the water absorption was almost the same for all formulation of denture base materials.
Collapse
Affiliation(s)
- A Nizam
- School of Medical Sciences, Universiti Sains Malaysia
| | | | | | | | | |
Collapse
|
28
|
Ang CY, Samsudin AR, Karima AMAS, Nizam A. Locally produced bovine bone sponge as a haemostatic agent. Med J Malaysia 2004; 59 Suppl B:149-50. [PMID: 15468862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
The aim of this study was to evaluate the morphological and biological properties of a locally produced "Bovine Bone Sponge" for use in dentistry. Bovine bone sponge was prepared from local calf bone. Endotoxin level and surface properties were investigated. The pore size and water uptake ability were measured and results were compared with the commercial haemostatic agent. The material was tested for its haemostatic property and its inhibition of alveolar bone resorption in a sheep model following dental extraction. Results revealed a significant difference in haemostatic effect, and a shorter bleeding time and a lower rate of alveolar bone resorption in bovine bone sponge compare to a commercial haemostatic agent.
Collapse
Affiliation(s)
- C Y Ang
- National Tissue Bank, School of Medical Sciences, University Sains Malaysia
| | | | | | | |
Collapse
|
29
|
Shamsuria O, Fadilah AS, Asiah AB, Rodiah MR, Suzina AH, Samsudin AR. In vitro cytotoxicity evaluation of biomaterials on human osteoblast cells CRL-1543; hydroxyapatite, natural coral and polyhydroxybutarate. Med J Malaysia 2004; 59 Suppl B:174-5. [PMID: 15468874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
The aim of this study was to evaluate the in vitro cytotoxicity of biomaterials; Hydroxyapatite (HA), Natural coral (NC) and Polyhydroxybutarate (PHB). Three different materials used in this study; HA (Ca10(PO4)6(OH)2), NC (CaCO3) and PHB (Polymer) were locally produced by the groups of researcher from Universiti Sains Malaysia. The materials were separately extracted in the complete culture medium (100mg/ml) for 72h and introduced to the osteoblast cells CRL-1543. The viability of osteoblast CRL-1543 cultivated with these extraction materials after 72h incubation period was compared to negative control with neutral red assay by using spectrophotometer at 540nm. The results showed the non-cytotoxicity of the materials. After 72h of incubation period, HA showed 123% viable cells, NC was 99.43% and PHB was 176.75%. In this study, cytotoxicity test dealt mainly with the substances that leached out from the biomaterial. The results obtained showed that the materials were not toxic and also promoted cells growth in the sense of biofunctionality.
Collapse
Affiliation(s)
- O Shamsuria
- School of Dental Sciences, Universiti Sains Malaysia Health Campus, 16150 Kubang Kerian, Kelantan
| | | | | | | | | | | |
Collapse
|
30
|
Mohamed SH, Arifin A, Mohd Ishak ZA, Nizam A, Samsudin AR. Effect of powder to liquid ratio on tensile strength and glass transition temperature of alumina filled poly methyl methacrylate (PMMA) denture base material. Med J Malaysia 2004; 59 Suppl B:147-8. [PMID: 15468861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
The aim of this study was to evaluate the mechanical properties and glass transition temperature (Tg) of a denture base material prepared from high molecular weight poly methyl methacrylate (PMMA) and alumina (Al2O3). The glass transition temperature was studied by using differential scanning calorimetry (DSC). The effect of powder-to-liquid ratio was investigated. The result showed that the tensile properties and the Tg were slightly effected by the powder-to-liquid ratio. The ratio of 2.2:1 by weight of powder to liquid was found to be the best ratio for mixing the material to give the best result in this formulation.
Collapse
Affiliation(s)
- S H Mohamed
- School of Materials & Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia
| | | | | | | | | |
Collapse
|
31
|
Pohchi A, Suzina AH, Samsudin AR, Al-Salihi KA. Comparative study between dense and porous hydroxyapatite using light and scanning electron microscopy. Med J Malaysia 2004; 59 Suppl B:151-2. [PMID: 15468863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
This in vivo study revealed that porous hydroxyapatite (PHA) and dense hydroxyapatite (DHA) are good implant materials that can accelerate bone healing and resorbed in acceptable time. But there were differences in the mechanism of the resorption of DHA and PHA due to variability in the physical properties and osteogenicity.
Collapse
Affiliation(s)
- A Pohchi
- School of Dental Sciences, Universiti Sains Malaysia Health Campus, Kubang Kerian, Kelantan
| | | | | | | |
Collapse
|
32
|
Shaari R, Samsudin AR. In vitro cytotoxicity testing on valued added hydroxyapatite as bone replacement material. Med J Malaysia 2004; 59 Suppl B:109-10. [PMID: 15468842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
The present in vitro evaluation indicated that the value added hydroxyapatite (HA) was more toxic than pure HA but the toxicity of value added HA was slight compared to the positive control. In this testing, the conclusion can be made that value added HA is less biocompatible than commercialized pure HA. This toxicity may be caused by both the particle size and degradation (leaching). Further studies should be carried out to determine whether there is particle size effect or leaching effect when using powder as compared to the block materials. The in vivo evaluation should be done to assess the reaction to this value added HA as compared to the pure HA.
Collapse
Affiliation(s)
- R Shaari
- School of Dental Sciences, Universiti Sains Malaysia Health Campus, 16150 Kubang Kerian, Kelantan, Malaysia
| | | |
Collapse
|
33
|
Rosdan S, Al-Salihi KA, Suzina AH, Samsudin AR. In vivo study of CORAGRAF: a preliminary results. Med J Malaysia 2004; 59 Suppl B:111-2. [PMID: 15468843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
The main objective of the study was to determine the biodegradability, resorption and osteoconductivity potency of coral implant. Coral blocks (CORAGRAF) were prepared from sea coral Porites species. The blocks were implanted in the right mandible of rabbit model. Implants were harvested at 2 and 4 weeks intervals and subjected for light and scanning electron microscopy. Dense hydroxyapatite (DHA) was implanted in the left mandible as a control. The results of this study demonstrated that CORAGRAF is a good implant material that can accelerates bone healing and be resorbed in an acceptable time. The mechanisms of the resorption seemed to be the same (crumbling process), a first step where the edge of the coral become powdery then a second step which could be phagocytosis and dissolution in extracellular fluid.
Collapse
Affiliation(s)
- S Rosdan
- School of Medical Sciences, Universiti Sains Malaysia Health Campus, 16150 Kubang Kerian, Kelantan, Malaysia
| | | | | | | |
Collapse
|
34
|
Mohamed SH, Arifin A, Mohd Ishak ZA, Nizam A, Samsudin AR. Mechanical and thermal properties of hydroxyaptite filled poly (methyl methacrylate) heat processed denture base material. Med J Malaysia 2004; 59 Suppl B:25-6. [PMID: 15468801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
The aim of this study was to evaluate the effect of powder-to-liquid ratio on the glass transition temperature (Tg) and the tensile properties of denture base material prepared from poly (methyl methacrylate) (PMMA) and hydroxyapatite (HA) previously treated with 3-trimethoxysilylpropyl methacrylate (gamma-MPS). Specimens for mechanical testing were prepared by adding composites powder (PMMA, BPO and HA) to the monomer (MMA and EGDMA) followed by hand mixing as in dental laboratory description usage. The glass transition temperature was studied by using differential scanning calorimetry (DSC). It was observed that the tensile properties and the Tg were affected by the powder-to-liquid ratio. The mechanical characterization of the materials were performed by using single edge notch-tension (SEN-T) specimens; the fracture toughness was slightly higher in formulation which contained HA filler compared to commercial denture base material.
Collapse
Affiliation(s)
- S H Mohamed
- School of Materials & Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia
| | | | | | | | | |
Collapse
|
35
|
Abdul Razak NH, Al-Salihi KA, Samsudin AR. An in vivo study of a locally-manufactured hydroxyapatite-based material as bone replacement material. Med J Malaysia 2004; 59 Suppl B:119-20. [PMID: 15468847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
Defects were created in the mandible of a rabbit model whereby the right side was implanted with hydroxyapatite (HA) while the left side was left empty to act as control. Both the implant and control sites were evaluated clinically and histologically at 4,12,20,22 weeks. Decalcified sections were studied under confocal laser scanning microscope. No reactive cells were evident microscopically in all sections. There was bone ingrowth as early as 4 weeks when viewed by the topographic method. Enhancement of osteoconduction was evident by the presence of abundant capillaries, perivascular tissue and osteoprogenitor cells of the host. At 22 weeks, the implanted defect showed mature bone formation filling almost the whole field. This study demonstrated that the dense HA exhibits excellent biocompatibility as noted by the complete absence of reactive cells. It also promotes osteoconduction.
Collapse
Affiliation(s)
- N H Abdul Razak
- School of Dental Sciences, Health Campus, Universiti Sains Malaysia, Kubang Kerian, Kelantan, Malaysia
| | | | | |
Collapse
|
36
|
Azlina A, Samsudin AR. Gene expressions screening of human cell line exposed to locally produced biomaterial. Med J Malaysia 2004; 59 Suppl B:166-7. [PMID: 15468870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
In Malaysia, the field of genomics in toxicology is still in infancy. The purpose of this study is to focus on the use of toxicogenomics for determination of gene expressions changes in cultured human fibroblast cells treated with genotoxicology free biomaterial (using Ames test), a locally produced hyroxyapatite. Dose and time response is similar to Ames test with time interval up to 21 days. mRNA is extracted, followed with RT-PCR and polyacrilamide gel electrophoresis. Changes of the gene expressions compared to the non-treated fibroblast mRNA would suggest some gene interactions in the molecule level associated with the exposure of the fibroblast cell line to the biomaterials. Further analysis (cloning & sequencing) shall be carried out to investigate the genes involved as simple changes might not signified toxicity.
Collapse
Affiliation(s)
- A Azlina
- Human Genome Center, Universiti Sains Malaysia Health Campus, 16150 Kubang Kerian, Kelantan, Malaysia
| | | |
Collapse
|
37
|
Samsudin AR. Bone biology in craniofacial growth, development and ageing. Med J Malaysia 2004; 59 Suppl B:6. [PMID: 15468791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Affiliation(s)
- A R Samsudin
- School of Dental Sciences, Universiti Sains Malaysia
| |
Collapse
|
38
|
Al-Salihi KA, Samsudin AR. Bone marrow mesenchymal stem cells differentiation and proliferation on the surface of coral implant. Med J Malaysia 2004; 59 Suppl B:45-6. [PMID: 15468811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
This study was designed to evaluate the ability of natural coral implant to provide an environment for marrow cells to differentiate into osteoblasts and function suitable for mineralized tissue formation. DNA content, alkaline phosptatase (ALP) activity, calcium (Ca) content and mineralized nodules, were measured at day 3, day 7 and day 14, in rat bone marrow stromal cells cultured with coral discs glass discs, while cells alone and coral disc alone were cultured as control. DNA content, ALP activity, Ca content measurements showed no difference between coral, glass and cells groups at 3 day which were higher than control (coral disc alone), but there were higher measurement at day 7 and 14 in the cell cultured on coral than on glass discs, control cells and control coral discs. Mineralized nodules formation (both in area and number) was more predominant on the coral surface than in control groups. These results showed that natural coral implant provided excellent and favorable situation for marrow cell to differentiate to osteoblasts, lead to large amount of mineralized tissue formation on coral surface. This in vitro result could explain the rapid bone bonding of coral in vivo.
Collapse
Affiliation(s)
- K A Al-Salihi
- School of Dental Sciences, Universiti Sains Malaysia, 16150 Kubang Kerian, Kelantan, Malaysia
| | | |
Collapse
|
39
|
Philip R, Dinsuhaimi S, Rosdan S, Samsudin AR, Shamsuria O, Mohd Zaki S, Jamalulail SMS. "In vitro evaluation of the growth enhancing or cytotoxic effect of Sticophus species (Gamat) on established human fibroblast cell lines and antimicrobial activity. Med J Malaysia 2004; 59 Suppl B:95-6. [PMID: 15468835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Affiliation(s)
- R Philip
- School of Medical Sciences, Universiti Sains Malaysia Health Campus, 16150 Kubang Kerian, Kelantan, Malaysia
| | | | | | | | | | | | | |
Collapse
|
40
|
Al-Salihi KA, Samsudin AR. Coral--polyhydroxybutrate composite scaffold for tissue engineering: prefabrication properties. Med J Malaysia 2004; 59 Suppl B:202-3. [PMID: 15468888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
In this study the surface properties of two particulate coral and polyhydroxybutrate (PHB) were studied in order to characterize them prior to use in composite production. Coral powder and PHB particle were evaluated using scanning electron microscopy and confocal laser scanning microscopy, to measure surface porosity and pores size. The results showed that coral powder has multiple pleomorphic micropores cross each others give appearance of micro-interconnectivity. Some pore reached to 18 microm with an average porosity of 70%. PHB revealed multiple different size pores extended to the depth, with an average some times reach 25 microm and porosity 45%. These findings demonstrate that both coral and PHB have excellent pores size and porosity that facilitate bone in growth, vascular invasion and bone development. We believe that incorporation of coral powder into PHB will make an excellent composite scaffold for tissue engineering.
Collapse
Affiliation(s)
- K A Al-Salihi
- School of Dental Sciences, Universiti Sains Malaysia, 16150 Kubang Kerian, Kelantan, Malaysia
| | | |
Collapse
|
41
|
Suzina AH, Azlina A, Shamsuria O, Samsudin AR. Mutagenicity of CORAGRAF and REKAGRAF in the Ames test. Med J Malaysia 2004; 59 Suppl B:105-6. [PMID: 15468840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
Mutagenicity of CORAGRAF (natural coral) and REKAGRAF (hydroxyapatite) was tested in Ames test with and without an external metabolic activation system (S9). The test revealed no mutagenic activity of both locally produced osseous substitutes.
Collapse
Affiliation(s)
- A H Suzina
- School of Medical Sciences, Universiti Sains Malaysia Health Campus, 16150 Kubang Kerian, Kelantan, Malaysia
| | | | | | | |
Collapse
|
42
|
Abstract
The differences in facial anatomical structures of the major ethnic groups, may also be reflected in nasal resistance. Active anterior rhinomanometry (AAR) is the recommended technique for the objective assessment of nasal airway resistance (NAR). This study comprised of 85 adult Malay subjects. All the subjects had to undergo a primary assessment of relevant symptoms of nasal disease and nasal examination before undergoing AAR assessment. The mean value of total nasal airway resistance (NAR) was 0.19 Pa/cm(3)/s (ranged from 0.09 to 0.55 Pa/cm(3)/s) at 75 Pa pressure point and 0.24 Pa/cm(3)/s (ranged from 0.12 to 0.52 Pa/cm(3)/s) at 150 Pa pressure point. The mean unilateral NAR was 0.46 Pa/cm(3)/s at a reference pressure of 75 Pa and 0.51 Pa/cm(3)/s at a reference pressure of 150 Pa. In this study we presented normal values for NAR in healthy Malay adult subjects. AAR proves to be a valuable clinical method for recording and quantitating nasal resistance.
Collapse
Affiliation(s)
- A H Suzina
- Department of Otorhinolaryngology-Head and Neck Surgery, Universiti Sains Malaysia Health Campus, 16150 Kubang Kerian, Kelantan, Malaysia
| | | | | |
Collapse
|
43
|
Abstract
Nasal obstruction is a subjective complaint in patients with nasal disease. The ability to quantitate the nasal ventilation dysfunction would be useful for making the appropriate choice of nasal disease management. This cross-sectional study comprised of 200 adult subjects. They underwent assessment of relevant symptoms, nasal examination and investigations before undergoing active anterior rhinomanometry (AAR) assessment. A group of 88 normal subjects and 112 patients with nasal disease were included. The mean total nasal air resistance (NAR) was significantly higher in patients with nasal disease (0.33 Pa/cm(3)/s) as compared to normal subjects (0.24 Pa/cm(3)/s). There was no significant difference in total NAR between patients with symptoms of nasal obstruction and those without the symptoms (p = 0.42). It is concluded that AAR is a sensitive but not a specific tool for the detection of abnormalities in NAR and it failed to relate to the symptom of nasal obstruction.
Collapse
Affiliation(s)
- A H Suzina
- Department of Otorhinolaryngology - Head and Neck Surgery, Universiti Sains Malaysia Health Campus, Kelantan, Malaysia
| | | | | |
Collapse
|
44
|
Abstract
A study of patients referred for wisdom teeth removal was carried out, to investigate symptoms prior to consultation and during the period on the waiting list for surgery. The reasons for treatment of asymptomatic wisdom teeth were investigated. Pain was the main indication for surgery in 73.7% of patients waiting for consultation. 168 patients waiting for consultation consumed a total of 271 courses of antibiotics, averaging 1.6 courses of antibiotics per patient. The antibiotic consumption increased to an average of 2.5 courses per patient in 94 patients waiting for operation. 67 out of 423 patients had an average of three lost working days due to symptoms from wisdom teeth. The long waiting list for consultation and treatment added further to the discomfort. The extent of symptoms from wisdom teeth may be underestimated.
Collapse
Affiliation(s)
- A R Samsudin
- Department of Oral And Maxillofacial Surgery, St. Luke's Hospital, Bradford
| | | |
Collapse
|