Ashtiani Alireza Hashemi, Azizian Mohammad, Rohani Ali
Departments of Prosthodontics, School of Dental Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
Department of Prosthodontics, School of Dental Medicine, Ilam University of Medical Sciences, Ilam, Iran.
Dent Res J (Isfahan). 2019 Mar-Apr;16(2):71-75.
The degree of tooth enamel wear is an important aspect of the clinical acceptability of all-ceramic restorations. The purpose of this study was to compare the degree of enamel wear by feldspathic porcelain and polymer-infiltrated ceramic.
In this study, 10 polymer-infiltrated ceramics were prepared by creating the sections of Vita Enamic blocks (18 mm × 14 mm × 4 mm). A total of 10 porcelain cylinders were built, and feldspathic porcelain (VMK 95, Vita) was used and fired over the metal discs. A total of 20 human maxillary premolars were assigned as antagonist. Then, 10 teeth were arranged and placed oppose to porcelain samples and 10 others were placed oppose to polymer-infiltrated-ceramic specimens in the chewing simulator. The samples were photographed before and after the chewing simulation. The difference between the two photograph was measured by stereomicroscope and Motic Image plus software 2.0 three times, and then, the mean of these three times was recorded as the amount of wear. Data were analyzed using independent samples -test and SPSS version 16. The level of significancy was 0.05.
The mean wear rate teeth oppose to the feldspathic porcelain group (377.294 μ) was significantly higher than that of the polymer-infiltrated ceramic group (101.755 μ) ( = 0.002).
In the present study, the amount of enamel wear of the natural teeth opposed to polymer-infiltrated ceramic was significantly lower than feldspathic porcelain.
牙釉质磨损程度是全瓷修复体临床可接受性的一个重要方面。本研究的目的是比较长石质瓷和聚合物渗透陶瓷导致的牙釉质磨损程度。
在本研究中，通过切割维他易美瓷块（18毫米×14毫米×4毫米）制备了10个聚合物渗透陶瓷样本。共制作了10个瓷柱体，使用长石质瓷（VMK 95，维他公司）并在金属盘上烧制。总共20颗人类上颌前磨牙被用作对抗牙。然后，将10颗牙齿排列并放置在与瓷样本相对的位置，另外10颗放置在与聚合物渗透陶瓷样本相对的位置，置于咀嚼模拟器中。在咀嚼模拟前后对样本进行拍照。通过体视显微镜和Motic Image plus软件2.0对两张照片的差异进行三次测量，然后将这三次测量的平均值记录为磨损量。使用独立样本t检验和SPSS 16版对数据进行分析。显著性水平为0.05。
与长石质瓷组相对的牙齿平均磨损率（377.294微米）显著高于聚合物渗透陶瓷组（101.755微米）（P = 0.002）。
在本研究中，与聚合物渗透陶瓷相对的天然牙的牙釉质磨损量显著低于长石质瓷。
