Costa Heloisa Módena Ferreira da, Rodrigues Renata Cristina Silveira, Mattos Maria da Glória Chiarello de, Ribeiro Ricardo Faria
Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.
Braz Dent J. 2003;14(3):197-202. doi: 10.1590/s0103-64402003000300011. Epub 2004 Mar 29.
Several formulations of alternative alloys have been proposed for the substitution of gold-based alloys used in Dentistry. Recently, a Ni-Cr-Ti-based alloy has been introduced. The purpose of this work was to verify the marginal adaptation obtained with one-piece superstructures for implant-supported prostheses obtained in Ni-Cr-Ti alloy, compared to a semi-noble alloy Pd-Ag. Eight superstructures for each alloy were produced over 4 implants in the anterior region of the mandible. The superstructures were placed in a torquemeter and the fixation screw of implant #1 was tightened with a 20 Ncm load with the others loosened (Sheffield test). The unfitness (in mm) was measured using a three-dimensional optical measurer in each implant, in the buccal and lingual aspects. The obtained data were submitted to statistical analysis by the analysis of variance and Tukey's test at 5% level. Significant differences were found for the factors material (p< or =0.05), with Ni-Cr-Ti pieces better than Pd-Ag ones, and implants (p< or =0.01). There were no significant differences for the factor position and interactions among factors (p>0.05). Based on the analysis of the data, it is possible to conclude that the Ni-Cr-Ti alloy makes possible the obtainment of one-piece implant-supported superstructures with a smaller misfit compared to the one obtained in Pd-Ag alloy, traditionally indicated for this situation. Additional tests may verify the superiority of the Ni-Cr-Ti alloy.
人们已经提出了几种替代合金配方，用于替代牙科中使用的金基合金。最近，一种镍铬钛基合金被引入。这项工作的目的是验证与半贵金属合金钯银相比，用镍铬钛合金制成的种植体支持修复体的一体式上部结构的边缘适合性。在下颌前部区域的4颗种植体上，为每种合金制作了8个上部结构。将上部结构放置在扭矩计中，种植体#1的固定螺钉以20 Ncm的载荷拧紧，其他螺钉松开（谢菲尔德试验）。使用三维光学测量仪在每个种植体的颊侧和舌侧测量不适合度（以毫米为单位）。所获得的数据通过方差分析和5%水平的Tukey检验进行统计分析。发现材料因素（p≤0.05）存在显著差异，镍铬钛部件优于钯银部件，种植体因素（p≤0.01）也存在显著差异。因素位置和因素间相互作用没有显著差异（p>0.05）。基于数据分析，可以得出结论，与传统上适用于这种情况的钯银合金相比，镍铬钛合金能够获得不适合度更小的一体式种植体支持上部结构。进一步的测试可能会验证镍铬钛合金的优越性。
