Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Inonu University, Malatya, Turkey.
Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Inonu University, Malatya, Turkey.
J Prosthet Dent. 2017 Aug;118(2):200-207. doi: 10.1016/j.prosdent.2016.11.005. Epub 2017 Jan 12.
The accuracy of recently introduced chairside computer-aided design and computer-aided manufacturing (CAD-CAM) blocks is not well established, and marginal integrity and internal adaptation are not known.
The purpose of this in vitro study was to evaluate the marginal and internal adaptation of hybrid and nanoceramics using microcomputed tomography (μ-CT).
The marginal and internal adaptation of 3 polymer-infiltrated ceramic-network (PICN) materials (Vita Enamic [VE]; Lava Ultimate [LU]; Vita Suprinity [VS]) were compared with lithium disilicate (IPS e.max.CAD, IPS). Ninety-six specimens (48 dies and 48 crowns) were prepared (n=12 each group) using a chairside CAD-CAM system. The restorations were scanned with μ-CT, with 160 measurements made for each crown, and used in 2-dimensional (2D) analysis. The marginal adaptation of marginal discrepancy (MD), absolute marginal discrepancy (AMD), internal adaptation of shoulder area (SA), axial space (AS), and occlusal space (OS) were compared using appropriate statistical analysis methods (α=.05). Cement volumes were compared using 3D analysis.
The IPS blocks showed higher MD (130 μm), AMD (156 μm), SA (111 μm) (P<.05), AS (52 μm), and OS (192 μm) than the other blocks (P<.01). The adaptation values of VS were significantly lower than those of the IPS block (P<.05). The adaption values of the LU and VE blocks were significantly lower than those of others (P<.01) but were statistically similar to one another (P>.05). IPS had the largest cement space at 18 mm (P<.01).
The marginal and internal adaptation values were within a clinically acceptable range for all 3 hybrids and nanoceramics tested.
最近引入的椅旁计算机辅助设计和计算机辅助制造（CAD-CAM）块的准确性尚未得到很好的确立，并且边缘完整性和内部适应性尚不清楚。
本体外研究的目的是使用微计算机断层扫描（μ-CT）评估混合陶瓷和纳米陶瓷的边缘和内部适应性。
将 3 种聚合物渗透陶瓷网络（PICN）材料（Vita Enamic [VE]；Lava Ultimate [LU]；Vita Suprinity [VS]）的边缘和内部适应性与锂硅二酸盐（IPS e.max.CAD，IPS）进行比较。使用椅旁 CAD-CAM 系统制备了 96 个试件（48 个模具和 48 个牙冠）（每组 n=12）。使用 μ-CT 对修复体进行扫描，对每个牙冠进行 160 次测量，并在 2 维（2D）分析中使用。使用适当的统计分析方法（α=.05）比较边缘差异（MD）、绝对边缘差异（AMD）、肩区（SA）、轴向空间（AS）和牙合面空间（OS）的边缘适应性。使用 3D 分析比较水泥体积。
IPS 块的 MD（130μm）、AMD（156μm）、SA（111μm）（P<.05）、AS（52μm）和 OS（192μm）均高于其他块（P<.01）。VS 的适应值明显低于 IPS 块（P<.05）。LU 和 VE 块的适应值明显低于其他块（P<.01），但彼此之间统计学上相似（P>.05）。IPS 的水泥空间最大，为 18mm（P<.01）。
所有 3 种混合陶瓷和纳米陶瓷的边缘和内部适应性值均在临床可接受范围内。
