Aref Neven S, Abdallah Reham M
Dental Biomaterials Department, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.
Basic Oral and Medical Sciences Department, College of Dentistry, Qassim University, Buraydah, Qassim, Saudi Arabia.
Int J Biomater. 2021 Apr 30;2021:9989747. doi: 10.1155/2021/9989747. eCollection 2021.
Patients with tooth sensitivity are frequently exposed to desensitizing agents on a regular basis. These agents might have an impact on the surface properties and color of existing oral restorations. Accordingly, this study aimed to investigate the color stability, surface microhardness, and surface roughness of resin-modified glass ionomer (RMGIC), amalgomer CR, nanohybrid, and bulk-fill resin composites restorative materials after frequent exposure to a desensitizing agent. Materials and Methods. One hundred and twenty specimens were prepared; 10 specimens for each restorative material were equally subdivided into control and desensitizing-agent-exposed groups in each test. Surface microhardness and surface roughness were evaluated using the Vickers microhardness tester and surface profilometer, respectively. The color change was measured by using a spectrophotometer using the CIE formula. Surface topography was analyzed using a scanning electron microscope (SEM). The collected data were analyzed with Student's -test, one-way ANOVA, and Tukey post hoc tests for pairwise comparison at a level of significance of 0.05.
The frequent use of a desensitizing agent significantly decreased surface hardness of RMGIC, amalgomer, and bulk-fill composite materials. However, nanohybrid composite exhibited a significant surface hardness increase. The surface roughness of RMGIC, amalgomer, and nanohybrid composite increased significantly. Meanwhile, the bulk-fill resin composite showed a nonsignificant decrease. Both RMGIC and amalgomer exhibited significantly higher values of color change in comparison to those of nanohybrid and bulk-fill composites.
The bulk-fill composite seems to be more resistant to discoloration and surface topographical changes than other tested materials on frequent exposure to the desensitizing agent. However, this exposure may pose a negative impact on its surface hardness. Bulk-fill resin composite may be the most suitable esthetic restorative in patients who frequently use desensitizing agents.
牙齿敏感患者经常定期接触脱敏剂。这些试剂可能会对现有口腔修复体的表面性质和颜色产生影响。因此，本研究旨在调查树脂改性玻璃离子体（RMGIC）、聚合体CR、纳米混合材料和大块充填树脂复合材料修复材料在频繁接触脱敏剂后的颜色稳定性、表面显微硬度和表面粗糙度。材料与方法。制备了120个标本；每种修复材料的10个标本在每次测试中均被等分为对照组和暴露于脱敏剂组。分别使用维氏显微硬度计和表面轮廓仪评估表面显微硬度和表面粗糙度。使用分光光度计通过CIE公式测量颜色变化。使用扫描电子显微镜（SEM）分析表面形貌。收集的数据采用学生t检验、单因素方差分析和Tukey事后检验进行两两比较，显著性水平为0.05。
频繁使用脱敏剂显著降低了RMGIC、聚合体和大块充填复合材料的表面硬度。然而，纳米混合复合材料的表面硬度显著增加。RMGIC、聚合体和纳米混合复合材料的表面粗糙度显著增加。同时，大块充填树脂复合材料的表面粗糙度呈非显著性降低。与纳米混合复合材料和大块充填复合材料相比，RMGIC和聚合体的颜色变化值均显著更高。
在频繁接触脱敏剂的情况下，大块充填复合材料似乎比其他测试材料更耐变色和表面形貌变化。然而，这种接触可能会对其表面硬度产生负面影响。大块充填树脂复合材料可能是经常使用脱敏剂的患者最合适的美学修复材料。
