Priya K Shanthi, Kumar M Praveen, Krishna V Pridhvi, Lakshmaiah P, Chalapathi Manasa, Devi Ganji
Department of Prosthodontics and Crown and Bridge, MNR Dental College and Hospital, Sangareddy, Telangana, India, Phone: +91 9949919751, e-mail:
Department of Prosthodontics and Crown and Bridge, MNR Dental College and Hospital, Sangareddy, Telangana, India.
J Contemp Dent Pract. 2019 Nov 1;20(11):1329-1334.
The aim of the present study was to evaluate the effect of acidic agents on microhardness and surface morphology of two metal ceramic materials at various intervals.
A total of 120 metal ceramic disks were prepared and divided into two categories with 60 each. Each category was divided into two groups, group I (Made of IPS d.SIGN) and group II (made of VITA VMK), containing 30 samples each, which was subdivided into three subgroups each containing 10 samples A(i) B(i) acting as control, A(ii) B(ii) immersed in 0.5% HCl, and A(iii) B(iii) immersed in soft cola drink. Group I was tested for microhardness with Vickers microhardness testing machine at an interval of 0 minute, 24 hours, and 168 hours after immersing in acidic agents. Group II was observed for surface morphology changes with scanning electron microscope before immersion, and at an interval of 24 hours and 168 hours after immersing in acidic agents. The results were analyzed statistically, tabulated, and compared.
Results revealed that there was a significant decrease in microhardness of IPS d.SIGN and VITA VMK when immersed in acidic agents at an interval of 0 minute, 24 hours, and 168 hours. There were significant surface morphological changes too of both the ceramics before and after immersing in acidic agents at 24 hours and 168 hours.
Acidic agents evaluated in the present study affected microhardness and surface morphology of both the ceramics, and IPS d.SIGN is the most suitable and would be recommended in people who consume acidic beverages.
Durability of dental ceramics is very good, but degradation occurs when exposed to acidic agents. All the properties of ceramics are to be known in depth as they are widely used to construct various types of prostheses, and this has to be considered especially in people who consume acidic foods and drinks. How to cite this article: Priya KS, Kumar MP, Krishna VP, Effect of Acidic Agents on Microhardness and Surface Morphology of Two Metal Ceramic Materials: An Study. J Contemp Dent Pract 2019;20(11):1329-1334.
本研究旨在评估酸性制剂在不同时间段对两种金属陶瓷材料显微硬度和表面形态的影响。
共制备120个金属陶瓷圆盘，分为两类，每类60个。每类再分为两组，第一组（由IPS d.SIGN制成）和第二组（由VITA VMK制成），每组含30个样本，每组又细分为三个亚组，每个亚组含10个样本，A(i)、B(i)作为对照，A(ii)、B(ii)浸入0.5%盐酸中，A(iii)、B(iii)浸入软可乐饮料中。第一组在浸入酸性制剂后0分钟、24小时和168小时，用维氏显微硬度测试机测试显微硬度。第二组在浸入酸性制剂前、浸入后24小时和168小时，用扫描电子显微镜观察表面形态变化。对结果进行统计学分析、列表并比较。
结果显示，IPS d.SIGN和VITA VMK在浸入酸性制剂后0分钟、24小时和168小时，显微硬度显著降低。在浸入酸性制剂24小时和168小时前后，两种陶瓷材料表面形态也有显著变化。
本研究中评估的酸性制剂影响了两种陶瓷材料的显微硬度和表面形态，IPS d.SIGN是最合适的，推荐给饮用酸性饮料的人群。
牙科陶瓷的耐久性非常好，但暴露于酸性制剂时会发生降解。由于陶瓷被广泛用于制作各种类型的假体，因此必须深入了解其所有性能，对于食用酸性食物和饮料的人群尤其如此。如何引用本文：Priya KS, Kumar MP, Krishna VP, 酸性制剂对两种金属陶瓷材料显微硬度和表面形态的影响：一项研究。《当代牙科实践杂志》2019；20(11):1329 - 1334。
