Effects of acid-etching on the tensile properties of demineralized dentin matrix.
Effects of acid-etching on the tensile properties of demineralized dentin matrix.
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酸蚀对脱矿牙本质基质拉伸性能的影响。
DOI：
10.1016/s0109-5641(98)00035-9
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
Pashley,D
中科院分区：
文献类型：
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作者：
Zhang,Y;Agee,K;Nör,J;Carvalho,R;Sachar,B;Russell,C;Pashley,D
研究目的：很少有研究评价常用的酸在粘接牙科中对脱矿牙本质基质的拉伸性能的影响。本研究的目的是评估一些酸性条件对人类冠状牙本质matrix.MethodsSmall沙漏形（用于UTS）或I-梁形（用于测定E）的极限拉伸强度（UTS）和弹性模量（E）的影响提取的人类第三磨牙的中冠状牙本质。在用清漆保护末端之后，将样品的中间在0.5M EDTA（pH 7）中完全脱矿质。UTS由拉伸应力至失效确定。根据应力应变曲线计算弹性模量。在95%的置信水平下，用方差分析和Student-Neuman-Keuls检验对结果进行分析。1- 2 min）对脱矿牙本质基质的拉伸性能没有可测量的影响。与磷酸盐缓冲盐水（PBS）暴露对照相比，暴露于2.5%和17.5%硝酸10分钟降低了UTS（p<0.05）。将脱钙牙本质暴露于含3%氯化铁的10%柠檬酸、10%柠檬酸、37%磷酸或含3%氯化铁的17.5%硝酸中10 min对UTS无影响。这些酸都没有一致降低stifficity.SignificanceThe结果表明，需要相对较长的暴露于酸，以改变脱矿牙本质的拉伸性能。短暂暴露于用于粘接牙科的酸不太可能严重削弱脱矿牙本质的物理性质。然而，应进行长期研究，以确定这种处理是否会增加基质对水解的敏感性。
ObjectivesLittle research has been done to evaluate the effects of acids commonly used in adhesive dentistry, on the tensile properties of the demineralized dentin matrix. The purpose of this study was to evaluate the effects of a number of acidic conditioners on the ultimate tensile strength (UTS) and modulus of elasticity (E) of human coronal dentin matrix.MethodsSmall hour-glass shaped (for UTS) or I-beam shaped (for determination of E) were prepared from mid-coronal dentin of extracted human third molars. After protecting the ends with varnish, the middle of the specimens was completely demineralized in 0.5M EDTA (pH7). UTS was determined by tensile stressing to failure. Modulus of elasticity was calculated from stress strain curves. The results were analyzed by ANOVA and Student–Neuman–Keuls test at the 95% confidence level.ResultsBrief (ca. 1–2min) exposure of demineralized dentin matrix to acids had no measurable effects on its tensile properties. Ten-minute exposures to 2.5% and 17.5% nitric acid lowered (p<0.05) the UTS compared to phosphate buffered saline (PBS)-exposed controls. Exposure of the decalcified dentin to 10% citric acid containing 3% ferric chloride, 10% citric acid, 37% phosphoric acid or 17.5% nitric acid containing 3% ferric chloride for 10min had no effect on UTS. None of these acids consistently lowered stiffness.SignificanceThe results indicate that relatively long exposures to acids are required to alter the tensile properties of demineralized dentin. It is unlikely that the brief exposures to acids that are used in adhesive dentistry would acutely weaken the physical properties of demineralized dentin. However, long-term studies should be done to determine if such treatment increases the susceptibility of the matrix to hydrolysis.