Gupta Sonam, Narayan Aparna Ichalangod, Balakrishnan Dhanasekar
Department of Prosthodontics and Crown & Bridge, Manipal College of Dental Sciences, Manipal University, Manipal, Karnataka, India.
Int J Dent. 2017;2017:6306530. doi: 10.1155/2017/6306530. Epub 2017 Feb 27.
. For a precise fit of multiple implant framework, having an accurate definitive cast is imperative. The present study evaluated dimensional accuracy of master casts obtained using different impression trays and materials with open tray impression technique. . A machined aluminum reference model with four parallel implant analogues was fabricated. Forty implant level impressions were made. Eight groups ( = 5) were tested using impression materials (polyether and vinylsiloxanether) and four types of impression trays, two being custom (self-cure acrylic and light cure acrylic) and two being stock (plastic and metal). The interimplant distances were measured on master casts using a coordinate measuring machine. The collected data was compared with a standard reference model and was statistically analyzed using two-way ANOVA. . Statistically significant difference ( < 0.05) was found between the two impression materials. However, the difference seen was small (36 m) irrespective of the tray type used. No significant difference ( > 0.05) was observed between varied stock and custom trays. . The polyether impression material proved to be more accurate than vinylsiloxanether impression material. The rigid nonperforated stock trays, both plastic and metal, could be an alternative for custom trays for multi-implant impressions when used with medium viscosity impression materials.
对于多个种植体框架的精确适配，拥有精确的终印模至关重要。本研究评估了使用不同印模托盘和材料并采用开放托盘印模技术获得的母模的尺寸精度。制作了一个带有四个平行种植体代型的加工铝制参考模型。制作了40个种植体水平印模。使用印模材料（聚醚和乙烯基硅氧烷醚）和四种类型的印模托盘进行八组（每组n = 5）测试，其中两种是定制托盘（自凝丙烯酸树脂和光固化丙烯酸树脂），两种是成品托盘（塑料和金属）。使用坐标测量机在母模上测量种植体间距离。将收集的数据与标准参考模型进行比较，并使用双向方差分析进行统计分析。在两种印模材料之间发现了具有统计学意义的差异（P < 0.05）。然而，无论使用何种托盘类型，观察到的差异都很小（36μm）。在不同的成品托盘和定制托盘之间未观察到显著差异（P > 0.05）。聚醚印模材料被证明比乙烯基硅氧烷醚印模材料更精确。刚性无孔成品托盘，无论是塑料的还是金属的，与中等粘度印模材料一起使用时，都可以作为多种植体印模定制托盘的替代品。
