Attin T, Buchalla W, Trett A, Hellwig E
Department of Operative Dentistry and Periodontology, University of Freiburg, Germany.
J Prosthet Dent. 1998 Aug;80(2):148-50. doi: 10.1016/s0022-3913(98)70102-7.
Polyacid-modified composites are recommended for use in lesions that are subjected to toothbrushing abrasion and acidic challenges, such as cervical lesions. There is little information whether these materials are able to withstand degradation due to erosive attacks and toothbrushing abrasion.
This study evaluated the resistance of polyacid-modified composites against toothbrushing abrasion under acidic and neutral conditions.
Forty specimens fabricated of each of two polyacid-modified composites (Dyract, Compoglass) were investigated. For each composite group, 20 specimens were placed in a neutral solution (pH: 6.8) and 20 specimens were placed in an acidic solution (pH: 3.0) for 24 hours. All specimens were brushed in an automatic toothbrushing machine, then subjected to storage in the respective buffer solution (8 hours), followed by brushing three times. Abrasion was determined profilometrically.
For both materials, abrasion in the acidic environment was significantly higher compared with neutral conditions. Thus, Compoglass composite demonstrated a lower abrasion resistance than Dyract composite.
The abrasion resistance of the investigated materials was reduced under acidic conditions.
聚酸改性复合材料被推荐用于易受刷牙磨损和酸性侵蚀的病变部位，如颈部病变。关于这些材料是否能够承受因侵蚀性攻击和刷牙磨损而导致的降解，目前几乎没有相关信息。
本研究评估了聚酸改性复合材料在酸性和中性条件下抵抗刷牙磨损的能力。
对两种聚酸改性复合材料（Dyract、Compoglass）各制作40个试件进行研究。对于每个复合材料组，将20个试件置于中性溶液（pH值：6.8）中，20个试件置于酸性溶液（pH值：3.0）中24小时。所有试件在自动刷牙机中刷牙，然后在各自的缓冲溶液中储存（8小时），接着再刷牙三次。通过轮廓仪测定磨损情况。
对于两种材料，酸性环境中的磨损均显著高于中性条件。因此，Compoglass复合材料的耐磨性低于Dyract复合材料。
在酸性条件下，所研究材料的耐磨性降低。
