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Anonymous asked in 社會與文化語言 · 1 decade ago

請英文達人~幫幫忙啦~~感恩~!!!

A case study of elemental and structural composition of

dental calculus during several stages of maturation using

SRXRF

J. Abraham,1 M. Greno´n,2 H. J. Sa´nchez,1,* C. Pe´rez,3 R. Barrea4

1Facultad de Mateme´tica Astronomı´a y Fı´sica, Universidad Nacional de Co´rdoba, 5000 Co´rdoba, Argentina

2Facultad de Odontologı´a, Universidad Nacional de Co´rdoba, 5000 Co´rdoba, Argentina

3Laboratorio Nacional Luz Sincrotron, CP 6192, 13084-971 Campinas, Campinas, Brasil

4BioCAT, Illinois Institute of Technology, 9700 South Cass Avenue, Argonne, Illinois 60439

Received 4 February 2005; revised 26 April 2005; accepted 4 May 2005

Published online 22 August 2005 in Wiley InterScience (www.interscience.wiley.com). DOI: 10.1002/jbm.a.30484

Abstract: This work presents a study of elemental composition

and preponderant structure of human dental calculus,

as they mature in the mouth for a period of 1 year. The

synchrotron radiation X-ray fluorescence technique using a

white beam was employed as an analytical method. The set

of samples were extracted from different dental elements of

the same subject, who did not require any other clinical care.

By means of analyzing the Ca/P molar ratio an estimation of

the main crystallographic structure was attained, by simple

comparison with stoichiometric values of the several crystalline

structures that compose the calculus. The results

showed a slowly progressive transformation of the initial

crystalline structures (brushite) into more stable structures

(hydroxyapatite), passing through octacalcium phosphate

and whitlockite. The concentrations of mayor components

(Ca and P) as a function of time followed a sigmoid curve.

The analysis of trace element concentratios versus time indicated

a null or small correlation of concentration values

with the kinetics of the crystallization process. © 2005 Wiley

Periodicals, Inc. J Biomed Mater Res 75A: 623–628, 2005

Key words: dental calculus; maturation; SRXRF

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  • 1 decade ago
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    元素和架構組成的案例研究

    牙齒的微積分在幾個階段的成熟期間使用

    SRXRF

    J . 亞伯拉罕,1 M。 Greno ,2 H。 J . Sa chez,1,* C。 Pe ez,3 R。 Barrea4

    1Facultad de Mateme ica Astronomi y Fi ica,Universidad Nacional de Co doba,5000 Co doba,阿根廷

    2Facultad de Odontologi ,Universidad Nacional de Co doba,5000 Co doba,阿根廷

    3Laboratorio Nacional Luz Sincrotron,加拿大新聞社6192,13084-971 Campinas,Campinas,巴西

    4BioCAT,伊芳利諾伊芳工學院,南方盒式錄音帶大街9700號,伊芳利諾伊芳,阿貢60439

    收到2005年2月4日; 2005年4月26日修正; 2005年5月4日接受

    在懷利InterScience(www.interscience.wiley.com)裡線上的2005年8月22日出版 . DOI︰ 10.1002 / jbm.a。 30484

    摘要︰ 這工作提出一項元素組成的研究

    以及人牙齒的微積分的佔優勢的架構,

    當他們在嘴成熟1年的時間時。

    同步加速器輻射X射線瑩光技術使用A

    白色的梁被用作一種分析的方法。 設備

    樣品中,從不同的牙齒的要素中抽提

    相同的主題,不需要任何其他臨床護理。

    透過分析Ca/P 摩爾分子量的比率估計

    主要晶體架構被取得,透過簡單

    有水晶幾的stoichiometric價值的比較

    組成微積分的架構。 結果

    顯示最初的緩慢進步的轉變

    晶體架構(bru * * * * * e) 進更穩定的架構

    (hydroxyapatite) ,透過octacalcium磷酸鹽

    以及whitlockite。 市長組成部分的集中

    (Ca和P) 因為一個時間函數跟隨一條sigmoid 曲線。

    微量元素concentratios 與時間的分析表明

    集中價值的空行或者小的相互關係

    由於結晶過程的動力學。 &-#169;2005懷利

    期刊股份有限公司 J Biomed母親調查75A︰ 623 28 , 2005

    關鍵字︰ 牙齒的微積分; 成熟; SRXRF

    ps.有的我不會

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