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

• 대한한의학회지
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• 제26권2호
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• pp.166-175
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• 2005

Objecitve: To present criteria for acupuncture standardization, which will improve the quality of acupuncture and secure safety, through studies of the biocompatibility of acupuncture needles. Methods: Acupuncture needles distributed in Korea were studied. Acute poisonous tests and pyrogenicity materials tests were executed to study the biocompatibility of acupuncture needles. Results & Conclusions: All 3 brands of acupuncture needles commonly distributed in Korea were found suitable for medical use, through acute poisonous tests and pyrogenicity materials tests. However, the medical instrument standards of the Korea Food and Drug Administration for acupuncture lack criteria concerning acute poisonous tests and pyrogenicity materials tests. The criteria for these tests should be standardized in order to secure the biocompatibility of acupuncture needles.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2011년도 춘계학술발표대회
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• pp.52.1-52.1
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• 2011

In this work, the effect of the addition of bioactive glass in the biocompatibility and mechanical behavior of conventional TTCP/DCPA based bone cement were investigated. The cement was initially modified with chitosan and HPMC which cross-linked with citric acid to improved mechanical properties.The injectable bone substitutes were further modified by adding varying amounts of bioactive glass (0%, 10%, 20% and 30%) and its effects on the biocompatibility of the material were studied. Afterbio-glass powders were mixed with the optimized composition for HPMC and citric acid content,the IBS was incubated at $37^{\circ}C$ at different time intervals and showed progressive formation of HAp with increasing time. Mechanical properties like Vickers hardness and compressive strength were found to increase with the increasing amount of bioactive glass addition and that setting time was shortened. The fabricated IBS morphologies were further characterized using SEM. MTT assay was performed to check the cell cytotoxicity and cell proliferation for 1, 3 and 5 days. Cell morphology, adhesion and proliferation behavior of cell in the IBS by culturing MG-63 cells on the IBS for 20, 60 and 90 mins and 1, 3 and 5 days was also investigated. All the results showed increasing biocompatibility as the bioglass content increased. MTT results found the materials to be cytocompatible and SEM images showed that cells attached and proliferated successfully.

• Journal of Korean Dental Science
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• 제7권1호
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• pp.1-5
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• 2014

Purpose: Capseal I and Capseal II are calcium silicate and calcium phosphate based experimental root canal sealers. This study sought to evaluate the biocompatibility and mineralization potential of Capseal I and Capseal II. Materials and Methods: The biocompatibility and mineralization related gene expression (alkaline phosphatase [ALP], bone sialoprotein [BSP], and osteocalcin) of Capseal I and Capseal II were compared using methylthiazol tetrazolium assay and reverse transcription-polymerization chain reaction analysis, respectively. The results were analyzed by Kruskal-Wallis test. A P-value of <0.05 was considered significant. Result: Both Capseal I and Capseal II were favorable in terms of biocompatibility, influencing the messenger RNA expression of ALP and BSP. Conclusion: Within the limitation of this study, Capseal is biocompatible, with mineralization promoting potential; thus, it could be a promising root canal sealer.

• Toxicological Research
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• 제20권1호
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• pp.13-20
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• 2004

The purpose of this study is to compare the biocompatibility of commercial purity Ti, Ti-6AI-4V and Ti-6AI-7Nb alloy specimens with and without surface treatment in mouse abdominal connective tissue in vivo. Each metal was implanted into specific abdominal subdermal tissue site of female mouse. After 4 weeks, the implants were removed and abdominal tissues were fixed, dehydrated and embedded in glycol methacrylate resin. And the tissues were histologically prepared for microscopical evaluation. It was characterized by the presence of connective tissue with fibrous capsule surrounding the implant. The fibrous tissue surrounding the implant was studied to determine the biocompatibility of implanted metals. The average thickness of the fibrous capsule formed around the implant was much thinner for the hydrogen peroxide added hydrochloric acid solution-treated specimen than for the others. The results of this evaluation indicate that modification of the surface properties of titanium and titanium alloy implants changes the biological properties in the abdominal connective tissue. In conclusion, these observations suggest that the proper surface treatment performed in the study is effective for the improvement of biocompatibility.

• 대한한의학회지
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• 제25권3호
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• pp.180-190
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• 2004

Objectives : To present criteria for acupuncture standardization, which will improve quality of acupuncture and secure safety, through studies of the biocompatibility of acupuncture materials. Methods : Acupuncture needles distributed in Korea were studied. Intracutaneous reaction tests and sterility tests were executed to study the biocompatibility of acupuncture. Results & Conclusions : All 4 kinds of acupuncture needles distributed in Korea were found suitable for medical use, through intracutaneous reaction tests and sterility tests. However, the medical instrument standards of the Korea Food and Drug Administration lack criteria concerning intracutaneous reaction tests and sterility tests. The criteria for these tests should be standardized in order to secure the biocompatibility of acupuncture needles.

• 한국세라믹학회지
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• 제27권6호
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• pp.721-728
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• 1990

Hydroxyapatite powders were synthesized with Ca/P=1.67 and pH=11 by precipitaton method, after characterization of these specimen, behavior in Ringer's solution and biocompatibility of hydroxyapatite, such as cytotoxity test and implantation test, were investigated. The hydroxyapatite ceramics had structural stability in Ringer's solution, and hydroxyapatite ceramics did not prevent cell growing and exhibit any cytotoxic effects. In implantation of hydroxyapatite ceramics into muscle under abdome of guinea pig, hydroxyapatite ceramics did not show any symptom of rejection for cellular texture.

• Biotechnology and Bioprocess Engineering:BBE
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• 제10권6호
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• pp.540-545
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• 2005

Poly(3-hydroxybutyrate-co-3-hydroxyvalerate), poly(3HB-co-3HV), copolyesters, with 3-hydroxyvalerate (3HV) contents ranging from 17 to 60 mol%, were produced by Alcaligenes sp. MT-16, and their biocompatibility evaluated by the growth of Chinese hamster ovary (CHO) cells and the adsorption of blood proteins and platelets onto their film surfaces. The number of CHO cells that adhered to and grew on these films was higher with increasing 3HV content. In contrast, the tendency for blood proteins and platelets to adhere to the copolyester surfaces significantly decreased with increasing 3HV content. Examination of the surface morphology using atomic force microscopy revealed that the surface roughness was an important factor in determining the biocompatibility of theses copolyesters. The results obtained in this study suggest that poly(3HB-co-3HV) copolyesters, with >30 mol% 3HV, may be useful in biocompatible biomedical applications.

• The Journal of Advanced Prosthodontics
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• 제12권3호
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• pp.157-166
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• 2020

PURPOSE. The aim of this study was to evaluate the clinical performance and reliability of plasma sprayed nanostructured zirconia (NSZ) coating. MATERIALS AND METHODS. This study consisted of three areas of analysis: (1) Mechanical property: surface roughness of NSZ coating and bond strength between NSZ coating and titanium specimens were measured, and the microstructure of bonding interface was also observed by scanning election microscope (SEM). (2) Biocompatibility: hemolysis tests, cell proliferation tests, and rat subcutaneous implant test were conducted to evaluate the biocompatibility of NSZ coating. (3) Mechanical compatibility: fracture and artificial aging tests were performed to measure the mechanical compatibility of NSZ-coated titanium abutments. RESULTS. In the mechanical study, 400 ㎛ thick NSZ coatings had the highest bond strength (71.22 ± 1.02 MPa), and a compact transition layer could be observed. In addition, NSZ coating showed excellent biocompatibility in both hemolysis tests and cell proliferation tests. In subcutaneous implant test, NSZ-coated plates showed similar inflammation elimination and fibrous tissue formation processes with that of titanium specimens. Regarding fatigue tests, all NSZ-coated abutments survived in the five-year fatigue test and showed sufficient fracture strength (407.65-663.7 N) for incisor teeth. CONCLUSION. In this study, the plasmasprayed NSZ-coated titanium abutments presented sufficient fracture strength and biocompatibility, and it was demonstrated that plasma spray was a reliable method to prepare high-quality zirconia coating.

• 대한치과보철학회지
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• 제56권4호
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• pp.391-395
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• 2018

진료실에서 지르코니아의 수요가 증가하고 있음에 따라 지르코니아의 생체적합성에 대한 평가가 필수적이다. 이번 논문에서는 지르코니아의 생체적 합성에 대한 문헌 중 in vitro 실험에서의 결과를 고찰하였다. Fibroblast, osteoblast, lymphocyte 등 다양한 세포를 이용한 in vitro 실험에서 지르코니아 블록은 뛰어난 생체적합성을 보였다. 여러 연구에서 지르코니아에 대한 세포독성 및 돌연변이 유발이 관찰되지 않았으며, 세균부착도 적은 것으로 나타났다. 장기간 체액노출조건을 모방한 in vitro 실험에서는 약간의 기계적 강도의 감소 외에는 악영향이 관찰되지 않았다. Osteoblast-like cell을 이용한 연구에서, 지르코니아 블록이 면역반응, 물질이동, 세포주기조절에 관여하는 유전자를 조절하여 생체적합을 높이는 것으로 관찰되었다. 여러 in vitro 연구에서 지르코니아 분말의 생체적합성에 대해서는 상이한 보고가 나타나고 있다. 종합적으로 지르코니아 분말은 어느 정도 세포독성을 가지고 있는 것으로 생각된다.