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INTRODUCTION
Dental calculus appearance and formation are not
well understood yet. A well-known theory of calculus
formation1 considers that precipitation of calcium salts
from supersaturated saliva is a result of an increased
pH caused by the loss of carbon dioxide from saliva.
The colloidal precipitation2 theory assumes that colloidal
substances in saliva become viscous and form
the matrix for the precipitation of calculus. Apparently,
the bacterial presence plays an important role
through chemical and enzymatic actions.3 Also, external
factors like dietary, salubrity, and hygienic habits,
among others, which vary from one individual to
other, act on calculus release. Probably a combination
of all these issues mediates in calculus appearance. In
addition, an individual dependence exists because
two different subjects with similar healthy status, in
the same environment, can have a very different
proneness to form calculus. Similar to the mechanisms
of calculus appearance, the structural phase changes
during calculus maturation are not well known. Understanding
these phase changes and the actions of
the agents that participate in them would contribute to
understand the mineralization processes and gather
the problem of calculus inhibition.
Dental calculus on teeth consists mainly of four
different calcium phosphate4 phases: hydroxyapatite
[Ca10(PO4)6 (OH)2], brushite (CaHPO4 2H2O), whitlockite
or tricalcium phosphate [(Ca,Mg)3 (PO4)2], and
octacalcium phosphate (Ca8H2(PO4)65H2O). From a
thermodynamics point of view, a system where several
phases coexist, as is the case of calculus, is a
complicated issue in physics. In addition, these crystals
can incorporate and exchange anions and cations
with the liquid media (saliva, plaque, and crevicular
fluids), which are rich in ions. Hydroxyapatite (HA)
allows the substitution of many ions (K, Na, Mg2,
F, Cl, CO3
2, HPO4
2, etc.),
1 Answer
- 2 decades agoFavorite Answer
是要翻國文嗎??
如果是要翻國文的話..↓
介紹
牙齒的微積分出現和形成不是
清楚地理解。 一個微積分的著名的理論
formation1 考慮鈣鹽的那降雨
從supersaturated中唾液是一個增加的結果
從唾液二氧化碳的損失引起的pH值。
膠狀的precipitation2 理論假裝那種膠體
以唾液的物質變得黏性和形式
微積分的降雨的基體。 顯然,
細菌的存在起重要作用
透過化學和 催行動。 3也,外部
象飲食,salubrity 和衛生的習慣一樣的原素,
及其他,這從一個人變化
其他,按照微積分釋放行動。 或許結合
所有這些問題中,在微積分出現方面調停。 在裡
增加,一個個別的表達式存在因為
兩不同主題與一起相似健康地位,在方面
相同環境,罐頭喝一不同
傾向形成微積分。 類似于機製
微積分出現,架構上的相位變化
在微積分期間成熟不眾所周知。 理解
這些種相位變化和行動
參加他們的代理人給投稿
理解礦化作用過程和收集
微積分抑制的問題。
在牙齒上的牙齒的微積分主要由4 組成
不同的鈣phosphate4 階段︰ hydroxyapatite
[Ca10(PO4)6(噢)2 ],bru *****e(CaHPO4 2H 2O),whitlockite
或者tricalcium磷酸鹽 [(Ca,毫克)3(PO4)2 ],並且
octacalcium磷酸鹽(Ca8H2(PO4)65H 2O)。 根據A
熱力學觀點,一系統在那裡幾個
階段共存,通常那樣是微積分的,是A
在物理學方面的錯綜複雜的問題。 另外,這些水晶
能合併並且交換陰離子和陽離子
由於液體媒介(唾液,飾板,和crevicular
流體),這富有離子。 Hydroxyapatite(哈)
允許很多離子的代替(K,鈉,Mg2,
F,Cl,CO3
2,HPO4
2,等等),