Zafar Muhammad Sohail, Ahmed Naseer
Department of Dental Biomaterials, College of Dentistry, Taibah University.
Dent Mater J. 2015;34(3):315-20. doi: 10.4012/dmj.2014-083. Epub 2015 Apr 23.
The objective of this study was to evaluate the effect of etching time on the surface properties of dental hard tissues including enamel and dentin. For this purpose, samples were prepared using extracted human teeth and treated with 37% phosphoric acid for various length of time using the set protocol. The effects of etching time on surface roughness were assessed using non-contact surface roughness profilometer and surface hardness was measured using nanoindentation technique. All results were analyzed statistically using SPSS computer software. Within the limitation of this study, it was concluded that etching time influences on the surface properties of dental hard tissues particularly the enamel. Enamel surface properties such as roughness and hardness can be altered remarkable as a matter of few seconds. Prolonged etching time than recommended is likely to increase the surface roughness and decrease surface hardness; compromising the bond strength of adhesive materials in clinical applications.
本研究的目的是评估蚀刻时间对包括牙釉质和牙本质在内的牙齿硬组织表面性能的影响。为此，使用拔除的人类牙齿制备样本，并按照既定方案用37%的磷酸处理不同时长。使用非接触式表面粗糙度轮廓仪评估蚀刻时间对表面粗糙度的影响，并使用纳米压痕技术测量表面硬度。所有结果均使用SPSS计算机软件进行统计分析。在本研究的局限性范围内，得出的结论是，蚀刻时间会影响牙齿硬组织的表面性能，尤其是牙釉质。牙釉质的表面性能，如粗糙度和硬度，可在短短几秒钟内发生显著变化。蚀刻时间超过推荐时长可能会增加表面粗糙度并降低表面硬度，从而在临床应用中损害粘结材料的粘结强度。
