• 제목/요약/키워드: Calcium-phosphate

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비결정성 calcium phosphate가 성견의 1면 골내낭에서의 치주조직 재생에 미치는 영향 (The effects of noncrystalline calcium phosphate glass on the healing of 1-wall intrabony defects in beagle dogs)

  • 백동훈;황성준;김창성;이용근;조규성;채중규;김종관;최성호
    • Journal of Periodontal and Implant Science
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    • 제34권1호
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    • pp.113-126
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    • 2004
  • 연구목적 : 이번 실험의 목적은 외과적으로 형성된 성견의 1면 골내낭에 새롭게 제조된, Ca/P 비율이 0.6인 비결정성 calcium phosphate를 적용하였을 때 치주조직의 재생에 미치는 영향을 평가하는 것이다. 연구방법 : 6마리 성견의 양측 하악 제2소구치의 원심면, 제4소구치의 근섬면에 외과적으로 1면 골내낭을 형성하여 치은박리소파술을 시행한 부위를 대조군으로, calcium phosphate만을 이식한 부위를 실험 1군, calcium phosphate와 GTR을 동반한 부위를 실험 2군으로 설정하고 실험하여 술 후 8주에 치유결과를 조직학적으로 관찰하였다. 결론 : 1. 접합상피의 치근단 이동은 대조군에서 결손부 깊이의 30.90 ${\pm}$ 9.92%, 실험 1군에서 결손부 깊이의 24.08 ${\pm}$ 9.12%, 실험 2군에서 결손부 깊이의 38.68 ${\pm}$ 12.22%로 나타났으며 대조군과 실험 1,2군간에 통계적 유의차는 없었다. 2. 결합조직 유착은 대조군에서 결손부 깊이의 36.38 ${\pm}$ 9.03%, 실험 1군에서 결손부 깊이의 26.96 ${\pm}$ 4.24%, 실험 2군에서 결손부 깊이의 27.87 ${\pm}$ 9.70%로 나타났으며 대조군과 실험 1,2군간에 통계적 유의차는 없었다. 3. 신생백악질 형성은 대조군에서 결손부 깊이의 32.92 ${\pm}$ 10.51%, 실험 1군에서 결손부 깊이의 49.16 ${\pm}$ 12.70%, 실험 2군에서 결손부 깊이의 39.62 ${\pm}$ 12.14%로 나타났으며 대조군과 실험 1군간에 통계적 유의차가 있었다. 4. 신생골 형성은 대조군에서 결손부 깊이의 27.24 ${\pm}$ 7.49%, 실험 1군에서 결손부 깊이의 43.51 ${\pm}$ 13.34%, 실험 2군에서 결손부 깊이의 36.47 ${\pm}$ 15.11%로 나타났으며 대조군과 실험 1, 2군간에 통계적 유의차는 없었다. 이상의 결과에서 볼 때, calcium phosphate glasses는 신생골 형성에는 통계적으로 유의차는 없었지만 상당히 증가된 양상을 보였고 신생백악질 형성에는 크게 기여함을 알수 있었다.

치아모세포와 키토산으로 강화된 생체 적합 칼슘인산시멘트와의 상호작용 (Interaction between odontoblast and bio-calcium phosphate cement reinforced with chitosan)

  • 전병도;김성원;이성탁;김태훈;;김규천;김용덕;김욱규
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • 제37권5호
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    • pp.415-420
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    • 2011
  • Purpose: Calcium phosphate cement (CPC) is one of many useful materials for restoring tooth defects, periodontium and maxillofacial area. Chitosan is a biodegradable material that has been shown to promote the growth and differentiation of osteoblasts in culture. This study examined the interaction between odontoblasts and bio-calcium phosphate cement reinforced with chitosan. Materials and Methods: $5{\times}10^3$ odontoblastic cells were seeded into each well. Various concentrations of bio-calcium phosphate cement reinforced with chitosan (10, 20, 50, 100, 200, 500 ${\mu}g$/ml, 1, 2, 4 mg/ml) were diluted and added to the wells. The well was incubated for 24 h, 48 h and 72 h. After incubation, the number of cells was assessed to determine the cell viability. A cytokinesis-block micronucleus assay and chromosomal aberration test were carried out to estimate the extent of chromosomal abnormalities. Microscopic photographs and RT-PCR were performed to examine the adhesion potential of bio-calcium phosphate cement reinforced with chitosan. Results: Bio-CPC-reinforced chitosan did not show significant cytotoxicity. The number of damaged chromosomes in the cells treated with Bio-CPC-reinforced chitosan was similar to that in the control cells. There was no significant increase in the number of chromosomal aberrations in the Bio-CPC reinforced chitosan exposed cells. Microscopic photographs and RT-PCR confirmed the adhesive potential of bio-CPC reinforced chitosan to odontoblasts. Conclusion: Bio-CPC-reinforced chitosan did not affect the odontoblastic cell viability, and had no significant cytotoxic effect. Bio-CPC-reinforced chitosan showed adhesive potential to odontoblasts. These results are expected form the basis of future studies on the effectiveness of dental restorative materials in Bio-CPC reinforced with chitosan.

In vitro biocompatibility of a cement compositecontaining poly ($\varepsilon$-caprolactonemicrosphere) (PCL)

  • Jyoti, Md. Anirban;Min, Young-Ki;Lee, Byong-Taek;Song, Ho-Yeon
    • 한국재료학회:학술대회논문집
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    • 한국재료학회 2009년도 추계학술발표대회
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    • pp.42.1-42.1
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    • 2009
  • In recent years, it has been tried to develop the efficacy and bioactivity of Calcium Phosphate cements(CPC) as injectable bone substitute (IBS) by reinforcing them through varying the amount in its compositions and relative concentrations or adding other additives. In this study, the biocompatibility of are inforced Calcium Phosphate-Calcium Sulfate injectable bone substitute (IBS)containing poly ($\varepsilon$-caprolactone)PCL microspheres was evaluated which consisted of solution chitosan and Na-citrate as liquid phase and tetra calcium phosphate (TTCP), dicalciumphosphate anhydrous (DCPA) powder as the solid phase. The in vitrobiocompatibility of the IBS was done using MTT assay and Cellular adhesion and spreading studies. The in vitro experiments with simulated body fluid (SBF) confirmed the formation of apatite on sample surface after 7 and 14 days of incubation in SBF. SEM images for one cell morphologies showed that the cellular attachment was good. MG-63 cells were found to maintain their phenotype on samples and SEM micrograph confirmed that cellular attachment was well. In vitro cytotoxicity tests by an extract dilution method showed that the IBS was cytocompatible for fibroblast L-929.

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Calcium Phosphate Cement Reinforced with Chopped High Performance Polyethylene Fiber.

  • Hirayama, S.;Ikemi, T.;Tsujimoto, Y.;Yamazaki, M.;Chow, L.C.;Takagi, S.;Antonucci, J.M.
    • 대한치과보존학회:학술대회논문집
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    • 대한치과보존학회 2001년도 추계학술대회(제116회) 및 13회 Workshop 제3회 한ㆍ일 치과보존학회 공동학술대회 초록집
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    • pp.567.1-567
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    • 2001
  • A self-setting calcium phosphate cement (CPC), consisting of tetracalcium phosphate (TTCP) and dicalcium phosphate anhydrous (DCP A), reacts with water and hardens fast (30 min) to form hydroxyapatite (HA) under physiological conditions as the final product. Although this CPC is finding increasing use as a biomaterial, it is presently limited to low stress bearing applications because of its relatively low strength and highly brittle nature. Recently the mechanical properties of CPC reinforced with chopped carbon fiber have been reported.

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Amputation level for hard tissue formation in pulp with tetracalcium / dicalcium phosphate compound.

  • Yoshikawa, M.;Toda, T.
    • 대한치과보존학회:학술대회논문집
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    • 대한치과보존학회 2001년도 추계학술대회(제116회) 및 13회 Workshop 제3회 한ㆍ일 치과보존학회 공동학술대회 초록집
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    • pp.566.1-566
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    • 2001
  • The most desirable healing process for endodontic therapy is apical closure by hard tissue such as dentine or cementum. Then, we estimated hard tissue conductivity of tetracalcium phosphate (4CP)/dicalcium phosphate (2CP) compound using mandibular first molars of SD rats. Residual pulp responses to the calcium phosphate compound were examined at several amputation levels of pulp. 2CP was purchased and passed through a $32-\mu\textrm{m}$ sieve. 4CP was obtained from a stoichiometric mixture of 2CP and calcium carbonate (Mol ratio: Ca/P=2.0) by the dry synthetic method at 1, 400(C for 8 hours.(omitted)

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인산가용화 활성을 갖는 바실러스 서브틸리스 HR-1019 분리와 특성 (Isolation and Characterization of a Novel Bacterium, Bacillus subtilis HR-1019, with Insoluble Phosphates Solubilizing Activity)

  • 이용석;박동주;김재훈;김형석;최용락
    • 생명과학회지
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    • 제23권2호
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    • pp.242-248
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    • 2013
  • 본 연구의 목적은 우수한 미생물 제제 개발용 인산염 가용화 균주의 개발이다. 경작지 토양에서 분리한 인산염 가용화 균주의 특성 및 16S rDNA 염기서열을 조사한 결과 Bacillus subtilis HR-1019로 동정되었다. Bacillus subtilis HR-1019는 hydroxyapatite, tri-calcium phosphate 및 aluminum phosphate 3가지의 난용성 인산염을 모두 가용화하였다. 난용성 인산염의 분해능이 최대가 되는 배양온도는 $37^{\circ}C$이었으며, 배양초기 pH가 5.0이었다. 탄소원으로 glucose를 5% 첨가시 가용화능이 높았으며, 가용화된 유리인산의 함량이 증가함에 따라 pH가 크게 감소하였다. 분리균주 HR-1019가 식물병원균에 대하여 균의 생육을 저지하는 clear zone 확인으로 항균효과를 확인하였다.

2종의 경화액과 혼합된 calcium phosphate cement의 유변학적 성질에 관한 연구 (Rheological Properties of Calcium Phosphate Cement Mixed with 2 Kinds of Setting Solution)

  • 장석우;권호범;유현미;박동성;오태석;배광식
    • 구강회복응용과학지
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    • 제24권3호
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    • pp.311-316
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    • 2008
  • Calcium phosphate cement (CPC)는 우수한 생체 친화성을 바탕으로 치과 및 의과 쪽에서 성공적인 bone substitute로 사용되어 왔다. 긴 경화시간 및 washout tendency 등 CPC의 단점을 개선하기 위해 다양한 종류의 경화액 및 첨가제등에 대한 연구가 이루어졌다. 그러나 첨가제의 종류에 따른 CPC paste의 점탄성을 정량적으로 비교한 연구는 많지 않다. 이 연구에서는 2% hydroxyprophyl methylcellulose (HPMC)와 35% polyacrylic acid (PAA)의 두 가지 경화액과 혼합된 CPC의 유변학적 성질을 관찰하고 비교하고자 하였다. Dicalcium phosphate dihydrate (DCPD)를 2% HPMC 및 35% PAA와 각각 1:1의 분액비로 30초간 섞은 후 cone and plate geometry를 가지는 rheometer를 사용하여 frequency sweep test와 time sweep test를 통해 shear storage modulus (G'), shear loss modulus (G''), 그리고 complex viscosity (${\eta}^*$)를 측정하였다. 2% HPMC군과 35% PAA군의 complex viscostiy의 차이를 Mann-whitney test with Bonferroni's collection을 사용하여 분석하였다. 실험결과 2% HPMC 및 35% PAA 군 모두에서 shear thinning과 yield behavior등 pseudoplastic property를 보였으며 complex viscosity는 HPMC 군에서 PAA 군보다 통계적으로 유의성 있게 높았다. (p<0.05).

인산가용화 사상균, Penicillium sp. PS-113 균주의 분리 및 배양특성 (Isolation and Cultural Characteristics of a Phosphate-solubilizing Fungus, Penicillium sp. PS-113)

  • 강선철;최명철
    • KSBB Journal
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    • 제13권5호
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    • pp.497-501
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    • 1998
  • A fungus with high phosphate solubilizing activites was isolated from soil using potato dextrose agar-calcium phosphate medium and identified to Penicillium sp. PS-113, based on the morphological characteristics of conidiophore and conidia; flask shape of phialide, simple branching type of conidiophore, and columnar shape of conidial head, in malt extract agar and potato dextrose agar media. The optimum temperature ad initial pH to solubilize rock phosphate in potato dextrose broth-rock phosphate medium were 30$^{\circ}C$ and pH 8.0, respectively. In these conditions phosphate solubilizing activities of Penicillium sp. PS-113 against four types of insoluble phosphate like tricalcium-phosphate, aluminium phosphate, hydroxyapatite and rock phosphate were quantitatively determined. As results, this fungus highly produced free phosphates to the culture broth with the concentrations of 1,283 ppm against tricalcium-phosphate, 585 ppm against rock phosphate, 528 ppm against aluminium phosphate, and 242 ppm against hydroxyapatite, respectively.

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골회자기의 소지 및 소성과정에 관한 연구 (A Study on Composition and Firing Temperature of Bone China Body)

  • 이응상;이성희
    • 한국세라믹학회지
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    • 제26권1호
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    • pp.67-72
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    • 1989
  • In order to define the composition range of bone china body with use of calcium phosphate, kaolin, quartz and feldspar as raw materials, we varied calcium phosphate from 40 to 55wt/o and selected basic composition by the change of raw materials in ternary system. After these bodies were fired at 120$0^{\circ}C$, 123$0^{\circ}C$, 125$0^{\circ}C$ and 128$0^{\circ}C$ their properties were closely tested to determine the compositions and firing conditions of bone china body.

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Characteristics of phosphorus containing waste-bones

  • 황안나;이수형;김지형
    • 한국지하수토양환경학회:학술대회논문집
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    • 한국지하수토양환경학회 2006년도 총회 및 춘계학술발표회
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    • pp.428-431
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    • 2006
  • 오염된 토양이나 지하수에 존재하는 중금속을 고정화시키기 위한 소스로 세 가지 종류의 뼈를 검토해보았다. 뼈 속에 있는 여러 종류의 calcium phosphate를 XPS로 분석한 결과, $Ca_8H_2(PO_4)_6.5H_2O$(octa-Calcium Phosphate)가 공통적으로 들어 있었고, 참치 뼈에는 유일하게 유기물 형태의 인이 들어 있었다. 증류수를 이용한 실험에서 뼈 속의 인산염은 액상에 쉽게 용출되기 때문에 중금속 고정화에 중요한 소스가 될 수 있다는 것을 알았다.

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