Singh Abhishek, Nagpal Abhishek, Pawah Salil, Pathak Chetan, Issar Gaurav, Sharma Pankaj
Department of Prosthodontics, Sudha Rustagi College of Dental Sciences and Research, Faridabad, Haryana, India, Phone: +919818613206 e-mail:
Department of Prosthodontics, ITS-CDSR Dental College and Hospital, Ghaziabad, Uttar Pradesh, India.
J Contemp Dent Pract. 2016 Sep 1;17(9):755-761. doi: 10.5005/jp-journals-10024-1925.
In an attempt to minimize wear damage to the enamel of antagonist teeth, new low and medium fusing ceramic materials have been developed. Manufacturers usually claim that these ceramics are wear-friendly because of their lower hardness, lower concentrations of crystal phase, and smaller crystal sizes. This study aimed to quantitatively analyze the wear strength of various commercially available dental porcelain with tooth enamel as well as the surface hardness of these dental porcelain.
The basic model was designed as a pin on plate arrangement. The tooth specimens were mounted on the stylus which was centered on the ceramic specimen in a wear testing machine. The dental ceramic specimen was centered in the metal die. A load of 40 N was applied at a rate of 80 cycles/minute for 15 minutes. In the current study, mean wear depth (Ra) value, volumetric loss, and surface hardness were obtained by standard quantification method and were statistically evaluated.
Ceramco-3 was reported to be most abrasive for enamel; however, Duceram love significantly more abraded itself than the other two, Ceramco-3 and Vita Alpha, and generated the lowest loss of enamel. Also, same abrasive type of wear was revealed for all three variants of tested ceramics.
Ceramco-3 was the most abrasive for enamel, while surface roughness (mean wear depth) of Duceram love was maximum and for Ceramco-3 it was minimum. The value of surface roughness for Vita Alpha was in between Duceram love and Ceramco-3. Nonetheless, the mean surface hardness of Duceram love was found to be least and maximum for Vita Alpha.
In situations of dental wear and wasting tooth disease (Attrition/Abrasion), Duceram can be applied in lieu of Ceramco-3 so as to prevent worsening of existing dentition. However, in younger patients Vita Alpha would offer maximum durability due to its greater surface hardness.
为尽量减少对拮抗牙牙釉质的磨损损害，已研发出新型的低熔和中熔陶瓷材料。制造商通常宣称，这些陶瓷因其较低的硬度、较低的晶相浓度和较小的晶体尺寸而对磨损具有友好性。本研究旨在定量分析各种市售牙科瓷器相对于牙釉质的耐磨强度以及这些牙科瓷器的表面硬度。
基本模型设计为销盘式装置。将牙齿标本安装在磨损试验机中位于陶瓷标本中心的探针上。牙科陶瓷标本位于金属模具的中心。以每分钟80次循环的速率施加40 N的载荷，持续15分钟。在本研究中，通过标准定量方法获得平均磨损深度（Ra）值、体积损失和表面硬度，并进行统计学评估。
据报道，Ceramco - 3对牙釉质的磨损性最强；然而，Duceram love自身的磨损明显比其他两种Ceramco - 3和Vita Alpha更严重，且导致牙釉质的损失最低。此外，所有三种测试陶瓷变体均呈现相同类型的磨料磨损。
Ceramco - 3对牙釉质的磨损性最强，而Duceram love的表面粗糙度（平均磨损深度）最大，Ceramco - 3的最小。Vita Alpha的表面粗糙度值介于Duceram love和Ceramco - 3之间。尽管如此，发现Duceram love的平均表面硬度最低，Vita Alpha的最高。
在牙齿磨损和耗蚀性牙病（磨耗/磨损）的情况下，可应用Duceram代替Ceramco - 3，以防止现有牙列状况恶化。然而，对于年轻患者，Vita Alpha因其更高的表面硬度将提供最大的耐用性。
