Postgraduate student, Department of Dental Materials and Prosthodontics, School of Dentistry, São Paulo State University (UNESP), Araraquara, Brazil.
Postdoctoral student, Department of Dental Materials and Prosthodontics, School of Dentistry, São Paulo State University (UNESP), Araraquara, Brazil.
J Prosthet Dent. 2018 Aug;120(2):318.e1-318.e8. doi: 10.1016/j.prosdent.2018.05.011.
Computer-aided design and computer-aided manufacturing (CAD-CAM) restorations are in contact with the antagonist tooth, either a natural tooth or a restoration. Therefore, clinicians should be aware of the wear resistance of CAD-CAM materials and the wear behavior of the antagonist.
The purpose of this in vitro study was to evaluate the wear resistance and abrasiveness of CAD-CAM materials.
In a 2-body wear test, the materials IPS e.max CAD (Ivoclar Vivadent AG), Vita Suprinity (Vita Zahnfabrik), Lava Ultimate (3M ESPE), Vita Enamic (Vita Zahnfabrik), and Lava Plus (3M ESPE) acted as abraders and, together with bovine enamel, also as antagonists. Each antagonist wheel ran against each abrader wheel for 200000 cycles, with a spring force of 15 N, and at a rotational speed of 1 Hz in distilled water. The wear rate was determined with a surface profilometer. The surfaces were observed with scanning electron microscopy, and their hardness, coefficient of friction, and roughness were evaluated.
Lava Plus and IPS e.max CAD exhibited the highest potential for wear of Lava Ultimate. These 2 materials, together with Vita Suprinity, provided the highest wear of enamel and Vita Enamic. Vita Suprinity and IPS e.max CAD had higher wear than Lava Plus, and the inverse was also true. Vita Enamic and Lava Ultimate were among the materials that caused the lowest wear of enamel and all other evaluated materials. Scanning electron microscopy images revealed that except for Lava Ultimate, all other materials damaged enamel, in which Vita Suprinity and IPS e.max CAD were more aggressive when sliding against the materials. Lava Plus had the greatest hardness, followed by Vita Suprinity and IPS e.max CAD, Vita Enamic, and then Lava Ultimate. The coefficient of friction varied from 0.42 to 0.53. The Vita Enamic and Lava Ultimate showed the highest surface roughness.
The nanofilled composite resin and polymer-infiltrated ceramic were more antagonist-friendly (whether enamel or CAD-CAM material) than glass-ceramics and zirconia. Care should be taken when selecting the material that will contact mainly with glass-ceramics. Hardness should also be considered when selecting a material.
计算机辅助设计和计算机辅助制造（CAD-CAM）修复体与对颌牙接触，无论是天然牙还是修复体。因此，临床医生应了解 CAD-CAM 材料的耐磨性和对颌牙的磨损行为。
本体外研究的目的是评估 CAD-CAM 材料的耐磨性和耐磨性。
在 2 体磨损试验中，Ivoclar Vivadent AG 的 IPS e.max CAD、Vita Suprinity、3M ESPE 的 Lava Ultimate、Vita Zahnfabrik 的 Vita Enamic 和 3M ESPE 的 Lava Plus 用作磨料，与牛牙釉质一起作为对颌牙。每个对颌牙轮与每个磨料轮在 15 N 的弹簧力和 1 Hz 的转速下在蒸馏水中运行 200000 个循环。用表面轮廓仪测定磨损率。用扫描电子显微镜观察表面，并评价其硬度、摩擦系数和粗糙度。
Lava Plus 和 IPS e.max CAD 对 Lava Ultimate 的磨损潜力最大。这两种材料与 Vita Suprinity 一起，对牙釉质的磨损最大，与 Vita Enamic 一起。Vita Suprinity 和 IPS e.max CAD 的磨损大于 Lava Plus，反之亦然。Vita Enamic 和 Lava Ultimate 是对牙釉质磨损最小的材料之一，也是所有其他评估材料之一。扫描电子显微镜图像显示，除了 Lava Ultimate 之外，所有其他材料都对牙釉质造成了损伤，其中 Vita Suprinity 和 IPS e.max CAD 在与材料滑动时更为激进。Lava Plus 的硬度最大，其次是 Vita Suprinity 和 IPS e.max CAD、Vita Enamic，然后是 Lava Ultimate。摩擦系数在 0.42 到 0.53 之间变化。Vita Enamic 和 Lava Ultimate 的表面粗糙度最高。
纳米复合树脂和聚合物渗透陶瓷比玻璃陶瓷和氧化锆对颌牙更友好（无论是牙釉质还是 CAD-CAM 材料）。在选择主要与玻璃陶瓷接触的材料时应谨慎。在选择材料时还应考虑硬度。
