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Jung JH, Hong SO, Noh K, Lee DW. A large sialolith on the parenchyma of the submandibular gland: A case report. Exp Ther Med 2014; 8:525-526. [PMID: 25009613 PMCID: PMC4079450 DOI: 10.3892/etm.2014.1730] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Accepted: 05/02/2014] [Indexed: 11/24/2022] Open
Abstract
A 45-year-old female was referred to the Department of Oral and Maxillofacial Surgery with the complaint of pain in the right submandibular region and a dry mouth, which had started one week previously. A clinical examination revealed a swelling and tenderness in the right submandibular region. Panoramic radiography and computed tomography identified a sialolith in the submandibular gland. Surgery on the sialolith was subsequently completed under general anesthesia extraorally. A brownish stone was present in the parenchyma of the submandibular gland, measuring 14×10 mm.
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Kwon YD, Lee DW, Hong SO. Magnesium vs. machined surfaced titanium - osteoblast and osteoclast differentiation. J Adv Prosthodont 2014; 6:157-64. [PMID: 25006378 PMCID: PMC4085238 DOI: 10.4047/jap.2014.6.3.157] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Revised: 03/05/2014] [Accepted: 03/10/2014] [Indexed: 11/26/2022] Open
Abstract
PURPOSE This study focused on in vitro cell differentiation and surface characteristics in a magnesium coated titanium surface implanted on using a plasma ion source. MATERIALS AND METHODS 40 commercially made pure titanium discs were prepared to produce Ti oxide machined surface (M) and Mg-incorporated Ti oxide machined surface (MM). Surface properties were analyzed using a scanning electron microscopy (SEM). On each surface, alkaline phosphatase (ALP) activity, alizarin red S staining for mineralization of MC3T3-E1 cells, and quantitative analysis of osteoblastic gene expression, were evaluated. Actin ring formation assay and gene expression analysis of TRAP and GAPDH performing RT-PCR were performed to characterize osteoclast differentiation on mouse bone marrow-derived macrophages (BMMs). RESULTS MM showed similar surface morphology and surface roughness with M, but was slightly smoother after ion implantation at the micron scale. M was more hydrophobic than MM. No significant difference between surfaces on ALP activity at 7 and 14 days were observed. Real-time PCR analyses showed similar levels of mRNA expression of the osteoblast phenotype genes; osteopontin (OPN), osteocalcin (OCN), bone sialoprotein (BSP), and collagen 1 (Col 1) in cell grown on MM at 7, 14 and 21 days. Alizarin red S staining at 21 days showed no significant difference. BMMs differentiation increased in M and MM. Actin ring formation assay and gene expression analysis of TRAP showed osteoclast differentiation to be more active on MM. CONCLUSION Both M and MM have a good effect on osteoblastic cell differentiation, but MM may speed the bone remodeling process by activating on osteoclast differentiation.
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Kim EC, Kim TH, Jung JH, Hong SO, Lee DW. Enhanced osteogenic differentiation of MC3T3-E1 on rhBMP-2-immobilized titanium via click reaction. Carbohydr Polym 2014; 103:170-8. [DOI: 10.1016/j.carbpol.2013.12.023] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2013] [Revised: 11/04/2013] [Accepted: 12/09/2013] [Indexed: 10/25/2022]
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Heo DN, Ko WK, Bae MS, Lee JB, Lee DW, Byun W, Lee CH, Kim EC, Jung BY, Kwon IK. Enhanced bone regeneration with a gold nanoparticle–hydrogel complex. J Mater Chem B 2014; 2:1584-1593. [DOI: 10.1039/c3tb21246g] [Citation(s) in RCA: 159] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
A hybrid hydrogel composed of gelatin and gold nanoparticles (GNPs) was designed to evaluate the effect of new bone formation and proves itself to be useful as an implant material for treating defected bone tissues.
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Kim SE, Yun YP, Han YK, Lee DW, Ohe JY, Lee BS, Song HR, Park K, Choi BJ. Osteogenesis induction of periodontal ligament cells onto bone morphogenic protein-2 immobilized PCL fibers. Carbohydr Polym 2014; 99:700-9. [DOI: 10.1016/j.carbpol.2013.08.053] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Revised: 07/28/2013] [Accepted: 08/20/2013] [Indexed: 12/21/2022]
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Kim SE, Yun YP, Park K, Kim HJ, Lee DW, Kim JW, Yang DH, Suh DH. The effects of functionalized titanium with alendronate and bone morphogenic protein-2 for improving osteoblast activity. Tissue Eng Regen Med 2013. [DOI: 10.1007/s13770-013-1098-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Mehta HM, Futami M, Glaubach T, Lee DW, Andolina JR, Yang Q, Whichard Z, Quinn M, Lu HF, Kao WM, Przychodzen B, Sarkar CA, Minella A, Maciejewski JP, Corey SJ. Alternatively spliced, truncated GCSF receptor promotes leukemogenic properties and sensitivity to JAK inhibition. Leukemia 2013; 28:1041-51. [PMID: 24170028 DOI: 10.1038/leu.2013.321] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Revised: 08/06/2013] [Accepted: 09/18/2013] [Indexed: 12/25/2022]
Abstract
Granulocyte colony-stimulating factor (GCSF) drives the production of myeloid progenitor and precursor cells toward neutrophils via the GCSF receptor (GCSFR, gene name CSF3R). Children with severe congenital neutropenia chronically receive pharmacologic doses of GCSF, and ∼30% will develop myelodysplasia/acute myeloid leukemia (AML) associated with GCSFR truncation mutations. In addition to mutations, multiple isoforms of CSF3R have also been reported. We found elevated expression of the alternatively spliced isoform, class IV CSF3R in adult myelodysplastic syndrome/AML patients. Aside from its association with monosomy 7 and higher rates of relapse in pediatric AML patients, little is known about the biology of the class IV isoform. We found developmental regulation of CSF3R isoforms with the class IV expression more representative of a progenitor cell stage. Striking differences were found in phosphoprotein signaling involving Janus kinase (JAK)-signal transducer and activator of transcription (STAT) and cell cycle gene expression. Enhanced proliferation by class IV GCSFR was associated with diminished STAT3 and STAT5 activation, yet showed sensitivity to JAK2 inhibitors. Alterations in the C-terminal domain of the GCSFR result in leukemic properties of enhanced growth, impaired differentiation and resistance to apoptosis, suggesting that they can behave as oncogenic drivers, sensitive to JAK2 inhibition.
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Lee JW, Heo CK, Kim SJ, Kim GT, Lee DW. Mouthguard use in Korean Taekwondo athletes - awareness and attitude. J Adv Prosthodont 2013; 5:147-52. [PMID: 23755340 PMCID: PMC3675287 DOI: 10.4047/jap.2013.5.2.147] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Revised: 04/25/2013] [Accepted: 05/07/2013] [Indexed: 11/16/2022] Open
Abstract
PURPOSE A survey was performed to identify the level of mouthguard use, awareness, wearability issues and attitude toward mouthguard among elite Korean Taewondo athletes. MATERIALS AND METHODS Survey questionnaires were given to 152 athletes participating in the Korea National Taekwondo team selection event for the 2010 Guangzhou Asian Games. Questionnaires consisted of three sections, mouthguard awareness, reasons for not wearing mouthguard and the last section to test the level of acceptance on current mouthguard and when the identified problems were resolved. For analyzing difference among response, χ2 test was used and significant level (α) was set up as 0.05. RESULTS Responses in each of items showed significant difference (P<.001). Majority of response regarding each question: Majority of respondents believed that mouthguard were effective in preventing injuries (36.4%) but the result suggested that the provision of information on mouthguard to athletes was inadequate (44.0%) and the result showed that respondents were not greatly interested or concerned in relation to the mandatory mouthguard rule (31.6%). Although the responses on the level of comfort and wearability of mouthguard were negative (34.8%), athletes were positively willing to wear mouthguard if the problems rectified (51.2%). CONCLUSION Considering the high level of willingness to wear mouthguard if the problems rectified, it is thought that together with efforts in providing more mouthguard information, the work of sports dentistry to research and improve mouthguard will be invaluable in promoting mouthguard to more athletes.
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Lee DW, Im DJ, Kang IS. Electric double layer at the interface of ionic liquid-dielectric liquid under electric field. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:1875-84. [PMID: 23331068 DOI: 10.1021/la3040775] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
The structure of the electric double layer (EDL) is analyzed in order to understand the electromechanical behavior of the interface of ionic liquid-dielectric liquid. The modified Poisson-Boltzmann equation proposed by Bazant et al. is solved to see the crowding and the overscreening effects that are the characteristics of an ionic liquid (Bazant, M. Z.; Storey, B. D.; Kornyshev, A. A. Double layer in ionic liquids: Overscreening versus crowding. Phys. Rev. Lett. 2011, 106, 046102.). From the simple one-dimensional (1-D) analysis, it is found that the changes of the composition and the material properties in the EDL are negligible except under some extreme conditions such as strong electric field over O(10(8)) V/m. From the electromechanical view points, an ionic liquid behaves like a pure conductor at the interface with a dielectric liquid. Based on these findings, three specific application problems are considered. In the first, a new method is suggested for measuring the interfacial tension of an ionic liquid-dielectric liquid system. The deformation of a charged ionic liquid droplet translating between two electrodes is used for this measurement. The second is for the Taylor cone problem, which includes an extreme electric field condition near the tip. The size of the critical region, where the EDL effect should be considered, is estimated by using the 1-D analysis result. Numerical computation is also performed to see the profiles of electric potential and the electric stress along the interface of the Taylor cone. Lastly, the electrowetting problem of the ionic liquid is considered. The discrepancies in the results of previous workers are interpreted by using the results of the present work. It is shown that all the results might be consistent if the leaking of the dielectric layer and/or the adsorption of ions is considered.
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Kim GT, Sohn M, Ahn HJ, Lee DW, Choi SC. Intra-alveolar root fracture in primary teeth. Pediatr Dent 2012; 34:e215-e218. [PMID: 23265157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
PURPOSE The purpose of this study was to assess the effectiveness of long-term resin wire splinting in the management and prognosis of intra-alveolar root fracture (IARF) in the primary teeth. METHODS The study population comprised 10 patients with 16 root fractures in their primary anterior teeth. Based on the trauma chart and radiographs, the data were organized and collected according to: age; gender; injured tooth; clinical appearance and location of IARF; splinting period; resorption rate of fractured fragment; and follow-up period. RESULTS Based on the information obtained in an inquiry, the mean age of the subjects was approximately 44.3 months old and root fractures occurred 2.3 times more often in males than females. IARF in the primary teeth usually occurred in the middle area. The mean splinting-period was 5.1 weeks, and all teeth were followed up for a long-term period lasting between 14 and 36 months. Total resorption of the fractured root fragment was observed within 10 months. CONCLUSION The root-fractured primary teeth can be maintained by reduction of tooth mobility and immobilization with a semi-rigid splint.
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Kim SE, Suh DH, Yun YP, Lee JY, Park K, Chung JY, Lee DW. Local delivery of alendronate eluting chitosan scaffold can effectively increase osteoblast functions and inhibit osteoclast differentiation. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2012; 23:2739-2749. [PMID: 22850978 DOI: 10.1007/s10856-012-4729-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2012] [Accepted: 07/23/2012] [Indexed: 06/01/2023]
Abstract
The aim of this study was to investigate the effect of alendronate released from chitosan scaffolds on enhancement of osteoblast functions and inhibition of osteoclast differentiation in vitro. The surface and cell morphologies of chitosan scaffolds and alendronate-loaded chitosan scaffolds were characterized by variable pressure field emission scanning electron microscope (VP-FE-SEM). Alendronate was released in a sustained manner. For evaluating osteoblast functions in MG-63 cells, we investigated cell proliferation, alkaline phosphatase (ALP) activity, and calcium deposition. Furthermore, for evaluating inhibition of osteoclast differentiation in RAW 264.7 cells, we investigated tartrate-resistant acid phosphatase (TRAP) activity, TRAP staining, and gene expressions. The in vitro studies revealed that osteoblasts grown on alendronate-loaded chitosan scaffold showed a significant increment in cell proliferation, ALP activity, and calcium deposition as compared to those grown on chitosan scaffolds. In addition, the in vitro study showed that osteoclast differentiation in RAW 264.7 cells cultured on alendronate-loaded chitosan scaffolds was greatly inhibited as compared to those cultured on chitosan scaffolds by the results of TRAP activity, TRAP staining, and gene expressions. Taken together, alendronate-loaded chitosan scaffolds could achieve the dual functions of improvement in osteoblast functions and inhibition of osteoclast differentiation. Thus, alendronate-eluting chitosan substrates are promising materials for enhancing osteoblast functions and inhibiting osteoclast differentiation in orthopedic and dental fields.
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Lee DW, Futami M, Carroll M, Feng Y, Wang Z, Fernandez M, Whichard Z, Chen Y, Kornblau S, Shpall EJ, Bueso-Ramos CE, Corey SJ. Loss of SHIP-1 protein expression in high-risk myelodysplastic syndromes is associated with miR-210 and miR-155. Oncogene 2012; 31:4085-94. [PMID: 22249254 DOI: 10.1038/onc.2011.579] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The myelodysplastic syndromes (MDSs) comprise a group of disorders characterized by multistage progression from cytopenias to acute myeloid leukemia (AML). They display exaggerated apoptosis in early stages, but lose this behavior during evolution to AML. The molecular basis for loss of apoptosis is unknown. To investigate this critical event, we analyzed phosphatidylinositol (PI) 3'kinase signaling, implicated as a critical pathway of cell survival control in epithelial and hematological malignancies. PI 3'kinase activates Akt through its production of 3' phosphoinositides. In turn, the phosphoinositides are dephosphorylated by two lipid phosphatases, PTEN and SHIP-1, in myeloid cells. We studied primary MDS-enriched bone marrow cells and bone marrow sections by western blotting, immunohistochemistry, immunocytochemistry and quantitative PCR for components of the SHIP/PTEN/PI 3'kinase signaling circuit. We reported constitutively activated Akt, variable levels of PTEN and uniformly decreased SHIP-1 expression in MDS progenitor cells. Overexpression of SHIP-1, but not the phosphatase-deficient form, inhibited myeloid leukemic growth. Levels of microRNA (miR)-210 and miR-155 transcripts, which target SHIP-1, were increased in CD34(+) MDS cells compared with their normal counterparts. Direct binding of miR-210 to the 3' untranslated region of SHIP-1 was confirmed by luciferase reporter assay. Transfection of a myeloid cell line with miR-210 resulted in loss of SHIP-1 protein expression. These data suggest that miR-155 and miR-210/SHIP-1/Akt pathways could serve as clinical biomarkers for disease progression, and that miR-155 and miR-210 might serve as novel therapeutic targets in MDS.
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Lee DW, Ji YB, Sung ES, Park JS, Lee YJ, Park DW, Tae K. Roles of ultrasonography and computed tomography in the surgical management of cervical lymph node metastases in papillary thyroid carcinoma. Eur J Surg Oncol 2012; 39:191-6. [PMID: 22863305 DOI: 10.1016/j.ejso.2012.07.119] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2012] [Revised: 03/22/2012] [Accepted: 07/23/2012] [Indexed: 12/24/2022] Open
Abstract
AIMS Adequate evaluation and surgical management of cervical lymph node metastasis is very important in papillary thyroid carcinoma (PTC). The aim of this study was to evaluate the impact of preoperative ultrasonography (US) and computed tomography (CT) on the surgical management of cervical lymph node metastases in PTC. METHODS Medical records and imaging findings were retrospectively analyzed for 252 patients with PTC who underwent thyroidectomy with neck dissection. RESULTS The sensitivity of both imaging techniques was lower in the central neck (US 23%, CT 41%) than in the lateral neck (US 70%, CT 82%). The specificities of US and CT were 97% and 90% in the central neck, and 84% and 64% in the lateral neck, respectively. Our surgical plans for therapeutic neck dissection were based on imaging findings in 59% of patients who underwent lateral compartment neck dissection and in 32.1% of patients who underwent central compartment neck dissection, respectively. CONCLUSIONS The roles of preoperative US and CT in surgical planning for central compartment neck dissection in PTC are limited because of their low sensitivity in the central neck, but US and CT may be useful in cases with non-palpable lateral neck nodes.
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Yang DH, Bae MS, Qiao L, Heo DN, Lee JB, Lee WJ, Park JH, Lee DW, Hwang YS, Kwon IK. In vitro evaluation of simvastatin acid (SVA) coated beta-tricalcium phosphate (β-TCP) particle on bone tissue regeneration. Macromol Res 2012. [DOI: 10.1007/s13233-012-0097-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Lee DW, Yun YP, Park K, Kim SE. Gentamicin and bone morphogenic protein-2 (BMP-2)-delivering heparinized-titanium implant with enhanced antibacterial activity and osteointegration. Bone 2012; 50:974-82. [PMID: 22289658 DOI: 10.1016/j.bone.2012.01.007] [Citation(s) in RCA: 135] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/23/2011] [Revised: 01/11/2012] [Accepted: 01/12/2012] [Indexed: 01/30/2023]
Abstract
Insufficient bonding of implants to bone tissues and bacterial infections lead to the failure of titanium (Ti)-based orthopedic and dental implants. The aim of this study is to develop novel Ti implants that enhance osteoblast functions, while simultaneously decreasing bacterial infections. First, the surface of pristine Ti was functionalized with heparin-dopamine by mimicking a mussel adhesion mechanism. Gentamicin sulfate (GS) and/or bone morphogenic protein-2 (BMP-2) was then sequentially immobilized to the heparinized-Ti (Hep-Ti) surface. The compositions of pristine Ti and Hep-Ti with or without gentamicin and/or BMP-2 were characterized by X-ray photoelectron spectroscopy (XPS) and the growth of Staphylococcus aureus on the substrates was assayed. Osteoblast functions of all Ti substrates were investigated by cell proliferation assays, alkaline phosphatase (ALP) activity, and calcium deposition. The results showed that the growth of bacteria on GS/Hep-Ti and GS/BMP-2/Hep-Ti was significantly lower compared to that on the pristine Ti and BMP-2/Hep-Ti. In addition, BMP-2/Hep-Ti and GS/BMP-2/Hep-Ti significantly enhanced ALP activity and calcium mineral deposition of osteoblast cells. Taken together, GS/BMP-2/Hep-Ti could achieve the dual functions of excellent antibacterial activity and osteoblast function promotion. Therefore, dual drug (antibiotics and osteoinductive protein)-eluting Ti substrates such as GS/BMP-2/Hep-Ti are a promising material for the enhanced osteointegration and implant longevity in orthopedics and dentistry.
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Lee DW, Lee HS, Jung MK, Kim SK, Jeon SW. A switch to endoscopic mucosal resection after precutting following gastric perforation during endoscopic submucosal dissection: a simple and useful technique. Endoscopy 2012; 44:293-6. [PMID: 22354826 DOI: 10.1055/s-0031-1291592] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
Endoscopic submucosal dissection (ESD) is safe and effective, but as the number of patients undergoing ESD has increased, so has the number of iatrogenic perforations. We describe the effectiveness and benefits of endoscopic mucosal resection after precutting (EMR-P) in a series of patients who developed a macroperforation during ESD. This was a retrospective, single-center case series from a prospectively maintained database in an academic tertiary care center. The study involved 16 patients with macroperforation out of 1171 patients who underwent ESD between November 2006 and January 2011. En bloc resection by EMR-P was achieved in 12 out of 16 patients (75%) and piecemeal resection in 4 (25%). All patients were discharged after a mean hospital stay of 6.8 days without further complications. There were no recurrences during the median follow-up period of 11.4 months. Macroperforation during ESD can be managed successfully by endoscopic closure, and EMR-P should then be considered.
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Hwang SH, Jung KA, Lee WJ, Yang KH, Lee DW, Carter A, Park CH, Hunter DJ. Morphological changes of the lateral meniscus in end-stage lateral compartment osteoarthritis of the knee. Osteoarthritis Cartilage 2012; 20:110-6. [PMID: 22133800 DOI: 10.1016/j.joca.2011.11.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Revised: 11/01/2011] [Accepted: 11/08/2011] [Indexed: 02/08/2023]
Abstract
OBJECTIVE The aim of this study was to evaluate the morphological changes of the lateral meniscus in end-stage lateral compartment osteoarthritis (OA) of the knee. METHODS One hundred fifty-eight knee joints from 133 patients that subsequently underwent total knee joint arthroplasty from January 2008 to December 2009 were enrolled. There were 26 men and 107 women. Their ages ranged from 56 to 81 (mean 67.4 ± 6.5 years). All study participants had complete obliteration of the lateral joint space identified by weight-bearing radiography. Meniscal position was assessed by measuring meniscal subluxation and meniscal height. The meniscal morphology was assessed using a modification of the whole-organ magnetic resonance imaging score (WORMS). The frequency of different meniscal morphology and their respective positions was calculated. RESULTS The predominant type (42.4%, 53.8% and 52.5% in the anterior horn, mid-body and posterior horn, respectively) of abnormal meniscal morphology was a complete maceration/destruction or complete resection. The anterior horn of non-macerated lateral meniscus was more subluxed than that of the non-macerated medial meniscus in patients with lateral OA. CONCLUSION This study suggests that the lateral meniscus in persons with end-stage lateral OA are mostly macerated or destroyed. Also, unlike isolated end-staged medial compartment OA, the anterior horn of the lateral meniscus in isolated end-stage lateral OA is commonly affected.
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Choi BJ, Park S, Lee DW, Ohe JY, Kwon YD. Effect of lower third molars on the incidence of mandibular angle and condylar fractures. J Craniofac Surg 2011; 22:1521-5. [PMID: 21778855 DOI: 10.1097/scs.0b013e31821d4cbb] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
PURPOSE Numerous previous studies already have proven that mandibles with a third molar are significantly more susceptible to angle fracture by external force. Similarly, other data suggest that the absence of a third molar increases the risk of condylar fracture, while concurrently decreasing the risk of angular fracture. We attempt to characterize the effect of a third molar on the incidence of mandibular angle and condylar fractures. METHODS This retrospective study reviews data from 385 patients, all of whom were seen in our clinics between February 2006 and November 2009. All data were collected from clinical examination notes and panoramic radiographs, with third-molar state evaluated by the Pell and Gregory classification system. RESULTS Our results mirror those of previous studies. The incidence of mandibular angle fracture was significantly greater on sides with a third molar, whereas the condylar fracture rate significantly increased in mandibles lacking a third molar or without a fully erupted third molar. The rate of symphysis and mandibular angle fracture was also high in cases of multiple comorbid fractures. CONCLUSIONS Both the presence and the state of the lower third molar affect the risk of future mandibular angle and condylar fracture.
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Cho HJ, Kim JW, Lee DW, Cho SW, Kim CG. Intravitreal bevacizumab and ranibizumab injections for patients with polypoidal choroidal vasculopathy. Eye (Lond) 2011; 26:426-33. [PMID: 22173075 DOI: 10.1038/eye.2011.324] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
PURPOSE To compare the effectiveness of intravitreal injection of bevacizumab and ranibizumab in patients with treatment-naïve polypoidal choroidal vasculopathy (PCV). METHODS A total of 66 and 60 eyes of 121 consecutive patients who received intravitreal bevacizumab (1.25 mg) or ranibizumab (0.5 mg) injection for treatment of PCV were retrospectively reviewed. After initial three loading injections by month, injection was performed as needed. Main outcome measures included best corrected visual acuity (BCVA), foveal center thickness (FCT) as assessed by spectral domain optical coherence tomography (SD-OCT), and change in polypoidal lesion on indocyanine green angiography (ICGA). RESULTS At 12 months, average number of injections was 4.72±1.84 in the bevacizumab group and 5.52±1.54 in the ranibizumab group. Mean logarithm of the minimum angle of resolution of BCVA from baseline at 12 months after injection improved by 0.11 in the bevacizumab group (P=0.02) and by 0.14 in the ranibizumab group (P=0.01). Average FCT decreased from 368±62.48 to 298±40.77 μm in the bevacizumab group (P=0.01) and from 371±50.79 to 286±36.93 μm in the ranibizumab group (P=0.01). Polyp regression rate was 24.2% (16 eyes out of 66 eyes) in the bevacizumab group and 23.3% (14 eyes out of 60 eyes) in the ranibizumab group. There was no statistically significant difference in BCVA improvement achieved, FCT improvement achieved, and polyp regression rate between groups. CONCLUSION Intravitreal injections of bevacizumab and ranibizumab have similar effects in stabilization of visual acuity, macular edema, and regression of polypoidal complex with PCV eyes.
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Jung J, Yim JH, Kwon YD, Al-Nawas B, Kim GT, Choi BJ, Lee DW. A radiographic study of the position and prevalence of the maxillary arterial endosseous anastomosis using cone beam computed tomography. Int J Oral Maxillofac Implants 2011; 26:1273-1278. [PMID: 22167433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023] Open
Abstract
PURPOSE This study was designed to investigate the prevalence and course of the vascular canals in the maxillary sinus walls and to measure the distance between the sinus floor, the edentulous alveolar crest, and the vascular canal using cone beam computed tomography (CBCT). MATERIALS AND METHODS The maxillary sinus CBCT scans of 250 patients scheduled for implant surgery were examined. The vertical and mediolateral positions of the vascular canals or notches were investigated on the CBCT images. The location of each tooth was confirmed using a diagnostic template for implant placement. Statistical analyses were performed to verify whether the mean artery position was significantly different according to each tooth location, gender, and age. RESULTS A maxillary arterial endosseous anastomosis was observed in 52.8% of patients. The mean perpendicular distance from the sinus floor to the vascular canal was shortest in the first molar region (7.58 ± 3.19 mm) and longest in the first premolar region (9.2 ± 3.22 mm). The mean distance from the alveolar crest to the vascular canal was shortest in the first molar region (14.79 ± 4.04 mm) and longest in the first premolar region (18.92 ± 4.86 mm). These distances were significantly different according to tooth position. The mean distances from the alveolar crest and the sinus floor to the vascular canal did not decrease with age. The mediolateral position of the canals was also significantly different depending on tooth position. CONCLUSION With this information about the branch of the posterior superior alveolar artery from CBCT, unnecessary bleeding during implant placement should be more easily preventable. The use of CBCT is recommended as a routine procedure prior to sinus floor elevation.
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Lee YM, Kim YC, Choi BJ, Lee DW, Yoon JH, Kim EC. Mechanism of sappanchalcone-induced growth inhibition and apoptosis in human oral cancer cells. Toxicol In Vitro 2011; 25:1782-8. [PMID: 21963806 DOI: 10.1016/j.tiv.2011.09.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2011] [Revised: 08/26/2011] [Accepted: 09/13/2011] [Indexed: 11/25/2022]
Abstract
Sappanchalcone, a flavonoid extracted from Caesalpinia sappan, exhibits cytoprotective activity, but the molecular basis for the anticancer effect of sappanchalcone has not been reported. In this study, we examined whether sappanchalcone could inhibit the growth of human primary and metastatic oral cancer cells, and we analyzed the signaling pathway underlying the apoptotic effects of the compound in this process using 3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyltetrazolium bromide (MTT) assays, fluorescence microscopy, flow cytometry, and Western blotting. Sappanchalcone-treated oral cancer cells showed an increased cytosolic level of cytochrome c, downregulated Bcl-2 expression, upregulated Bax and p53 expression, caspase-3 and -9 activation, and poly (ADP-ribose) polymerase cleavage. Furthermore, sappanchalcone induced activation of p38, extracellular signal-regulated kinase (ERK), c-Jun amino-terminal kinase (JNK), and Nuclear factor k B (NF-κB), as demonstrated by the phosphorylation of each mitogen-activated protein kinases (MAPKs), the degradation of inhibitor of NF-κα (IκB-α), increased expression of nuclear p65, and NF-κB-DNA binding. Inhibition of the expression of p38, ERK, JNK, and NF-κB by pharmacological inhibitors reversed sappanchalcone-induced growth inhibition and apoptosis. These results provide the first evidence that sappanchalcone suppresses oral cancer cell growth and induces apoptosis through the activation of p53-dependent mitochondrial, p38, ERK, JNK, and NF-κB signaling. Thus, it has potential as a chemotherapeutic agent for oral cancer.
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Waldrop MA, Leinung MC, Lee DW, Grasso P. Intranasal delivery of mouse [D-Leu-4]-OB3, a synthetic peptide amide with leptin-like activity, improves energy balance, glycaemic control, insulin sensitivity and bone formation in leptin-resistant C57BLK/6-m db/db mice. Diabetes Obes Metab 2010; 12:871-5. [PMID: 20920039 DOI: 10.1111/j.1463-1326.2010.01243.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND We have recently shown that intranasal administration of mouse [D-Leu-4]-OB3 reconstituted in Intravail(®) to male Swiss Webster mice resulted in significantly higher uptake and bioavailability when compared with commonly used injection methods of delivery. AIM AND METHODS In this study, we examined the effects of intranasal delivery of mouse [D-Leu-4]-OB3 in Intravail(®) on energy balance, glucose regulation, insulin secretion and serum levels of osteocalcin, a specific and sensitive marker of bone formation. Genetically obese C57BLK/6-m db/db mice were allowed food and water ad libitum and given either Intravail(®) alone or mouse [D-Leu-4]-OB3 in Intravail(®) for 14 days by intranasal instillation. RESULTS Mouse [D-Leu-4]-OB3 reduced body weight gain, daily food intake, daily water intake and serum glucose by 11.5, 2.2, 4.0 and 61.9%, respectively. Serum insulin levels in db/db mice given mouse [D-Leu-4]-OB3 were approximately threefold lower than those in mice receiving Intravail(®) alone. Mouse [D-Leu-4]-OB3 elevated serum osteocalcin in db/db mice by 28.7% over Intravail(®) treated control mice. CONCLUSIONS The results of our study indicate that intranasal delivery of biologically active mouse [D-Leu-4]-OB3 in Intravail(®) is feasible and has significant effects on regulating body weight gain, food and water intake, serum glucose, insulin sensitivity and bone formation in leptin-resistant C57BLK/6-m db/db mice.
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Park CS, Lee DW. Fabrication of unique tungsten tips by the self-descending phenomenon of menisci. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2010; 10:4955-4959. [PMID: 21125834 DOI: 10.1166/jnn.2010.2412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
This paper describes the fabrication of tungsten tips with high aspect ratios for use as probes in scanning tunneling microscopy. A Teflon bath with the hydrophobic property is employed as an etching bath instead of the use of conventional glass beakers. Hydrophobicity of the Teflon bath with a unique shape causes a gradual decrease of the meniscus during the etching process. Owing to this effect, tungsten tips with high aspect ratios and resonance frequencies can be easily fabricated without the help of any additional mechanical and electrical parts. The fabrication of W tips with radii of curvature down to 20 nm is demonstrated using the new method. The reproducibility of the unique W-tip structure is also experimentally confirmed.
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Lee DW, De Los Santos V L, Seo JW, Leon Felix L, Bustamante D A, Cole JM, Barnes CHW. The structure of graphite oxide: investigation of its surface chemical groups. J Phys Chem B 2010; 114:5723-8. [PMID: 20380401 DOI: 10.1021/jp1002275] [Citation(s) in RCA: 161] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The structure of graphite oxide (GO) has been systematically studied using various tools such as SEM, TEM, XRD, Fourier transform infrared spectroscopy (FT-IR), X-ray photoemission spectroscopy (XPS), (13)C solid-state NMR, and O K-edge X-ray absorption near edge structure (XANES). The TEM data reveal that GO consists of amorphous and crystalline phases. The XPS data show that some carbon atoms have sp(3) orbitals and others have sp(2) orbitals. The ratio of sp(2) to sp(3) bonded carbon atoms decreases as sample preparation times increase. The (13)C solid-state NMR spectra of GO indicate the existence of -OH and -O- groups for which peaks appear at 60 and 70 ppm, respectively. FT-IR results corroborate these findings. The existence of ketone groups is also implied by FT-IR, which is verified by O K-edge XANES and (13)C solid-state NMR. We propose a new model for GO based on the results; -O-, -OH, and -C=O groups are on the surface.
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Lee DW, Koo KT, Seol YJ, Lee YM, Ku Y, Rhyu IC, Chung CP, Kim TI. Bone regeneration effects of human allogenous bone substitutes: a preliminary study. J Periodontal Implant Sci 2010; 40:132-8. [PMID: 20607058 PMCID: PMC2895519 DOI: 10.5051/jpis.2010.40.3.132] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2010] [Accepted: 06/01/2010] [Indexed: 11/24/2022] Open
Abstract
Purpose The purpose of this study was to compare the bone regeneration effects of cortical, cancellous, and cortico-cancellous human bone substitutes on calvarial defects of rabbits. Methods Four 8-mm diameter calvarial defects were created in each of nine New Zealand white rabbits. Freeze-dried cortical bone, freeze-dried cortico-cancellous bone, and demineralized bone matrix with freeze-dried cancellous bone were inserted into the defects, while the non-grafted defect was regarded as the control. After 4, 8, and 12 weeks of healing, the experimental animals were euthanized for specimen preparation. Micro-computed tomography (micro-CT) was performed to calculate the percent bone volume. After histological evaluation, histomorphometric analysis was performed to quantify new bone formation. Results In micro-CT evaluation, freeze-dried cortico-cancellous human bone showed the highest percent bone volume value among the experimental groups at week 4. At week 8 and week 12, freeze-dried cortical human bone showed the highest percent bone volume value among the experimental groups. In histologic evaluation, at week 4, freeze-dried cortico-cancellous human bone showed more prominent osteoid tissue than any other group. New bone formation was increased in all of the experimental groups at week 8 and 12. Histomorphometric data showed that freeze-dried cortico-cancellous human bone showed a significantly higher new bone formation percentile value than any other experimental group at week 4. At week 8, freeze-dried cortical human bone showed the highest value, of which a significant difference existed between freeze-dried cortical human bone and demineralized bone matrix with freeze-dried cancellous human bone. At week 12, there were no significant differences among the experimental groups. Conclusions Freeze-dried cortico-cancellous human bone showed swift new bone formation at the 4-week healing phase, whereas there was less difference in new bone formation among the experimental groups in the following healing phases.
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