J Adhes Dent. 2017;19(2):177-183. doi: 10.3290/j.jad.a38140.
To investigate the buffering capacity of restorative materials during a simulated carious and intrinsic erosive attack.
Cavities with a volume of 130 μl were milled (Cerec MC XL) out of blocks of Ceram X Mono (CM), Quixfil (QX), Filtek Supreme (FS), Apa Fill 3 (AF), an experimental dual-curing composite containing a bioactive glass (EX), Dyract eXtra (DY), Beautifil (BE), Equia Fil (EQ), Telio CAD (TL) (negative control), TheraCal (TC; positive control), and extracted teeth (ED). 80 μl of lactic acid (pH 4.5) and hydrochloric acid (pH 2.6) were each pipetted into the cavities of two samples of each material. Change of pH in the solutions was measured continuously for 12 min using a calibrated pH electrode.
CM, AF, and FS (final pH 3.0-3.2) neutralized hydrochloric acid to a significantly lesser extent than did BE, EQ, DY and QX (final pH 5.0-5.6) (p < 0.05, ANOVA Scheffé). The lactic-acid buffering capacity of CM, BE, and AF was equivalent (final pH 6.3-7.4) to that of ED (7.5), but was surpassed by FS (pH 8.0). pH values for EX and TC (final pH 9.2-11.3) increased significantly (p < 0.05) in response to both acids.
Conventional restorative materials do not buffer better than human teeth. However, the experimental composite demonstrates that buffering against carious and intrinsic erosive acid attacks is technically feasible.
研究修复材料在模拟龋齿和内源性酸蚀攻击下的缓冲能力。
用 Cerec MC XL 从 Ceram X Mono (CM)、Quixfil (QX)、Filtek Supreme (FS)、Apa Fill 3 (AF)、一种含有生物活性玻璃的实验性双固化复合树脂 (EX)、Dyract eXtra (DY)、Beautifil (BE)、Equia Fil (EQ)、Telio CAD (TL)（阴性对照）、TheraCal (TC；阳性对照）和离体牙 (ED) 块中铣出体积为 130 μl 的腔。将 80 μl 的乳酸（pH 4.5）和盐酸（pH 2.6）分别吸入每种材料的两个样本的腔中。使用校准的 pH 电极连续 12 分钟测量溶液的 pH 值变化。
CM、AF 和 FS（最终 pH 值 3.0-3.2）中和盐酸的程度明显低于 BE、EQ、DY 和 QX（最终 pH 值 5.0-5.6）（p<0.05，ANOVA Scheffé）。CM、BE 和 AF 的乳酸缓冲能力相当（最终 pH 值 6.3-7.4）与 ED（7.5）相当，但 FS（pH 值 8.0）则更高。EX 和 TC（最终 pH 值 9.2-11.3）的 pH 值因两种酸的作用而显著升高（p<0.05）。
传统的修复材料的缓冲能力并不优于人牙。然而，实验性复合材料表明，针对龋齿和内源性酸蚀攻击的缓冲在技术上是可行的。
