• Restorative Dentistry and Endodontics
• /
• 제39권2호
• /
• pp.79-88
• /
• 2014

Appropriate use of local hemostatic agent is one of the important factors on the prognosis of endodontic microsurgery. However, most investigations to date focus on the hemostatic efficacy of the agents, whereas their biologic characteristics have not received enough attention. The purpose of this paper was to review the biologic response of local hemostatic agents, and to provide clinical guidelines on their use during endodontic microsurgery. Electronic database (PUBMED) was screened to search related studies from 1980 to 2013, and 8 clinical studies and 18 animal studies were identified. Among the materials used in these studies, most widely-investigated and used materials, epinephrine, ferric sulfate (FS) and calcium sulfate (CS), were thoroughly discussed. Influence of these materials on local tissue and systemic condition, such as inflammatory and foreign body reaction, local ischemia, dyspigmentation, delayed or enhanced bone and soft tissue healing, and potential cardiovascular complications were assessed. Additionally, biological property of their carrier materials, cotton pellet and absorbable collagen, were also discussed. Clinicians should be aware of the biologic properties of local hemostatic agents and their carrier materials, and should pay attention to the potential complications when using them in endodontic microsurgery.

• 대한두경부종양학회지
• /
• 제34권2호
• /
• pp.1-9
• /
• 2018

With the emerging knowledge about tumor biology specific for human papillomavirus (HPV)-related head and neck cancers, the classical understanding about the curative surgery in head and neck cancers are starting to progress, customized for their HPV-associations and ultimately specific for tumor biologic characteristics. The common rule for surgery should reflect the biologic characteristics of target tumors, but still, multi-institutional large-scale data could be scarce, due to the subjective feature of surgical treatment itself. However, the impact of HPV for margin determination is now being questioned by multiple groups, and typical example is European Cooperative Oncology Group (ECOG)-3311 study. Here, we review the impact of viral association for surgical decision and its biological background and implications.

• 대한치과교정학회지
• /
• 제43권3호
• /
• pp.120-126
• /
• 2013

Objective: To gain basic information regarding the biologic stability of plasma ion-implanted miniscrews and their potential clinical applications. Methods: Sixteen plasma ion-implanted and 16 sandblasted and acid-etched (SLA) miniscrews were bilaterally inserted in the mandibles of 4 beagles (2 miniscrews of each type per quadrant). Then, 250 - 300 gm of force from Ni-Ti coil springs was applied for 2 different periods: 12 weeks on one side and 3 weeks contralaterally. Thereafter, the animals were sacrificed and mandibular specimens including the miniscrews were collected. The insertion torque and mobility were compared between the groups. The bone-implant contact and bone volume ratio were calculated within 800 mm of the miniscrews and compared between the loading periods. The number of osteoblasts was also quantified. The measurements were expressed as percentages and analyzed by independent t-tests (p < 0.05). Results: No significant differences in any of the analyzed parameters were noted between the groups. Conclusions: The preliminary findings indicate that plasma ion-implanted miniscrews have similar biologic characteristics to SLA miniscrews in terms of insertion torque, mobility, bone-implant contact rate, and bone volume rate.

• The Korean journal of internal medicine
• /
• 제39권2호
• /
• pp.215-227
• /
• 2024

Asthma is characterized by airway obstruction and inflammation, and presents significant diagnostic and treatment challenges. The concept of endotypes has improved understanding of the mechanisms of asthma and has stimulated the development of effective treatment strategies. Sputum profiles may be used to classify asthma into two major inflammatory types: type 2-high (T2H) and type 2-low (T2L) asthma. T2H, characterized by elevated type 2 inflammation, has been extensively studied and several effective biologic treatments have been developed. However, managing T2L is more difficult due to the lack of reliable biomarkers for accurate diagnosis and classification. Additionally, conventional anti-inflammatory therapy does not completely control the symptoms of T2L; therefore, further research is needed to identify effective biologic treatments. This review provides new insights into the clinical characteristics and underlying mechanisms of severe T2L and investigates potential therapeutic approaches to control the disease.

• 대한치과보철학회지
• /
• 제43권6호
• /
• pp.751-763
• /
• 2005

Statement of problem. To improve a direct implant fixation to the bone, various strategies have been developed focusing on the surface of materials. The surface quality of the implant depends on the chemical, physical, mechanical and topographical properties of the surface. The different properties will interact with each other and a change in thickness of the oxide layer may also result in a change in surface energy, the surface topography and surface, chemical composition. However, there is limited the comprehensive study with regard to changed surface and biologic behavior of osteoblast by anodization. Purpose of study. The aim of this study was to analyze the characteristics of an oxide layer formed and to evaluate the cellular biologic behaviors on titanium by anodic oxidation (anodization) by cellular proliferation, differentiation, ECM formation and gene expression. And the phospholipase activity was measured on the anodized surface as preliminary study to understand how surface properties of Ti implant are transduced into downstream cellular events. Methods and Materials. The surface of a commercially pure titanium(Grade 2) was modified by anodic oxidation. The group 1 samples had a machined surface and other three experimental specimens were anodized under a constant voltage of 270 V(Group 2), 350 V(Group 3), and 450 V(Group 4). The specimen characteristics were inspected using the following five categories; the surface morphology, the surface roughness, the thickness of oxide layer, the crystallinity, and the chemical composition of the oxide layer. Cell numbers were taken as a marker for cell proliferation. While the expression of alkaline phosphatase and Runx2 (Cbfa1) was used as early differentiation marker for osteoblast. The type I collagen production was determined, which constitutes the main structural protein of the extracellular matrix. Phospholipase $A_2$ and D activity were detected. Results. (1) The anodized titanium had a porous oxide layer, and there was increase in both the size and number of pores with increasing anodizing voltage. (2) With increasing voltage, the surface roughness and thickness of the oxide film increased significantly (p<0.01), the $TiO_2$phase changed from anatase to rutile. During the anodic oxidization, Ca and P ions were more incorporated into the oxide layer. (3) The in vitro cell responses of the specimen were also dependant on the oxidation conditions. With increasing voltage, the ALP activity, type I collagen production, and Cbfa 1 gene expression increased significantly (p<0.01), while the cell proliferation decreased. (4) In preliminary study on the relation of surface property and phospholipase, PLD activity was increased but $PLA_2$ activity did not changed according to applied voltage. Conclusion. The anodized titanium shows improved surface characteristics than the machined titanium. The surface properties acquired by anodization appear to give rise more mature osteoblast characteristics and might result in increased bone growth, and contribute to the achievement of a tight fixation. The precise mechanism of surface property signaling is not known, may be related to phospholipase D.

• 한국임상약학회지
• /
• 제29권2호
• /
• pp.109-114
• /
• 2019

Background: Rheumatoid arthritis (RA) is a systemic inflammatory disease that manifests as joint damage or athletic disability via sustained inflammation of the synovial membrane. The risk of cardiovascular disease (CVD) is higher in RA patients. This study aimed at evaluating the association between CVD comorbidities and RA by comparing a pharmacotherapy group with a non-pharmacotherapy group. Methods: Patient sample data from the Health Insurance Review and Assessment Service (HIRA-NPS-2016) were used. Inverse probability of treatment weighting (IPTW) using the propensity score was used to minimize the differences in patient characteristics. Logistic regression analysis was used to evaluate the risk of CVD comorbidities. Results: The analyses included 1,207,213 patients, of which 33,122 (2.8%) had RA. The odds ratios (OR) of CVD comorbidities were increased in RA patients; ischemic heart disease (IHD: OR 1.75; 95% CI 1.73, 1.77), cerebral infarction (CERI: OR 1.28; 95% CI 1.26, 1.30), hypertension (HTN: OR 1.44; 95% CI 1.43, 1.45), diabetes mellitus (DM: OR 2.04; 95% CI 2.03, 2.06), and dyslipidemia (DL: OR 3.49; 95% CI 3.47, 3.51). The ORs of IHD, CERI, HTN, and DM in the traditional DMARD and biologic treatment groups were decreased, compared with those in the non-pharmacotherapy group. Conclusions: Thus, CVD risk was higher in RA patients, considering age, sex, and socioeconomic status. Appropriate pharmacotherapy could decrease the risk of CVD comorbidities in RA patients.

• Fibers and Polymers
• /
• 제2권2호
• /
• pp.71-74
• /
• 2001

Surface characterization of materials has been considered critical in the development of biomaterials, as many unfavorable responses from the body occur at the interface between a material and the body component. The contact angle measurement is one means to characterize the surface properties and to correlate them to the biocompatibility of materials. In this paper, surface characteristics of silk fibroin/S-carboxymethyl kerateine, representative fibrous proteins, were investigated by contact angle measurements of ESCA. The biocompatibility of the blends was evaluated based on minimal interfacial free energy concept, and compared with other potential biomaterials. It was also hypothesized that the enhanced surface polarity of the blends was generated from the conformational transition of proteins. This approach to evaluate the biocompatibility of materials based on surface characteristics may find wide utility in many biomedical applications.

• Journal of Korean Neurosurgical Society
• /
• 제47권1호
• /
• pp.26-29
• /
• 2010

Objective: Recurrent lumbar disc herniation has been reported to occur in 5% to 15% of surgically treated primary lumbar disc herniation cases. We investigated the molecular biologic characteristics of primary herniated discs and recurrent discs to see whether the recurrent discs has the similar biological features with primary herniated discs. Methods: Primary hemiated disc and recurrent disc cells were obtained by discectomy of lumbar disc patients and cells were isolated and then taken through monolayer cultures. We compared chondrogenic and osteogenic mRNA gene expression, and western blot between the two groups. Results: The mRNA gene expression of recurrent disc cells were increased 1.47* times for aggrecan, 1.38 times for type I collagen, 2.04 times for type II collagen, 1.22 times for both Sox-9 and osteocalcin, and 1.31 times for alkaline phosphatase, respectively, compared with the primary herniated lumbar disc cells (*indicates p < 0.05). Westem blot results for each aggrecan, type I collagen, type II collagen, Sox-9, osteocalcin, and alkaline phosphatase were similar between the primary herniated disc cells and recurrent disc cells. Conclusion: These results indicate that the recurrent disc cells have similar chondrogenic and osteogenic gene expression compared to primary herniated disc cells. Therefore, we assumed that the regeneration of remaining discs could fill the previous discectomy space and also it could be one of the factors for disc recurrence especially in the molecular biologic field.

• Journal of Oral Medicine and Pain
• /
• 제32권3호
• /
• pp.273-281
• /
• 2007

아연 화합물은 의학적 효용이 뛰어나서 예전부터 화장품, 의약품 및 치과용 제제 등으로 널리 사용되어 왔다. 특히, 아연의 구강내 생물학적 작용에 대해서는 널리 알려져 있는데, 아연은 구강내 미생물에 다양한 기전으로 영향을 가해서 항균 작용, 항치태 작용, 항우식 작용을 갖게 된다. 또한, 아연은 구취를 유발하는 구강내 혐기성 세균과 구강내 휘발성 황화합물에 영향을 주어서 구취 치료제로서도 널리 애용되고 있다. 이에 저자는 아연의 개괄적인 물성과 독성 및 상용되고 있는 아연 제제들을 요약하여 제시한 후, 구강내 세균과 휘발성 황화합물에 대한 아연의 생물학적 영향에 대하여 항균 효과, 항치태 효과, 항우식 효과 및 구취감소 효과 등으로 나누어 고찰해보았다. 아연은 다른 금속에 비하여 독성이 적고 치아 착색을 거의 유발하지 않으며, 가격 또한 저렴하여 구강내 감염, 치아우식증, 치주질환 및 구취 등의 예방 및 치료제로서 많은 장점을 지니고 있다. 향후 이러한 장점을 바탕으로, 치과 임상에서의 아연제제의 적용은 증가할 것으로 사료되며, 이에 대한 전망은 밝다고 할 수 있다.

• 대한기관식도과학회:학술대회논문집
• /
• 대한기관식도과학회 1993년도 제27차 학술대회 초록집
• /
• pp.85-85
• /
• 1993

후두 편평세포암은 종양세포의 생물학적 특성과 발생부위별 미세환경이 다르기 때문에 임상적 병기만으로 예후를 추정하는 것은 다소 문제점이 있다. 이에 저자들은 종양세포의 유전정보에 의한 증식능이 예후와 연관성이 있는지 규명하고자 EGFR, p53 단백 및 pRB의 표현양상을 후두 편평세포암 40례의 임상적 특성과 비교 검토하여 다음과 같은 성적을 얻었다. 1. p53 단백의 양성 표현율은 임상적 병기, 원발병소의 병기, 경부 림프전이절의 병기, 병리조직학적 분화도, 재발이나 원격전이 흑은 이차암이 있었던 경우와 연관성이 높았다. 2. pRB의 음성 표현율은 침습성이 강한 성문상분, 임상적 병기, 원발병소의 병기, 병리 조직학적 분화도, 재발이나 원격전이 혹은 이차암, 치료에 실패한 경우와 연관성이 높았다. 3. 3년생존율은 p53의 양성표현율과 관계가 있었다. 4. EGFR은 특별한 상관관계가 없었다. 이상의 결과로 보아 p53 단백과 pRB의 암억제유전자 단백의 면역조직화학적 염색을 통한 표현양상은 후두 편평세포암의 생물학적인 특성을 잘 반영하고 있을 뿐만 아니라 종양 즉 인자들과 밀접한 상관관계가 있어 후두 편평세포암의 악성도를 예측하는데 도움을 주는 예후인자로서 적용시킬 수 있을 것으로 생각된다.