Gehrke Sergio Alexandre, Dedavid Berenice Anina, de Oliveira Fernandes Gustavo Vicentis
Department of Biotechnology, Universidad Católica de Murcia, 30107, Murcia, Spain; Department of Research, Biotecnos - Technology and Science, 11100, Montevideo, Uruguay.
Department of Materials Engineering, Pontificia Universidade Católica do Rio Grande do Sul, 90619-900, Porto Alegre, Brazil.
J Mech Behav Biomed Mater. 2021 Apr;116:104347. doi: 10.1016/j.jmbbm.2021.104347. Epub 2021 Jan 22.
The objective of this study was to evaluate a new design of multifunctional abutment for Morse taper implant connections, relative to the retentive stability after the application of cyclic loads in cemented and screwed crowns. Multifunctional abutments with two different angulations in the seating portion of the crown were tested, forming 2 groups (n = 30 samples per group): Group Abut11, where Smart abutments with an angle of 11.42° were used; Group Abut5, where Ideale abutments with an angle of 5° were used. Fifteen samples from each group received cemented crowns (CC) and another fifteen screwed crowns (SC). All crown samples were subjected to the mechanical cycling test at 360,000 cycles at a frequency of 4 Hz and 150 N of the load. The samples with CC were subjected to the tensile test to remove the crowns, while in the samples with SC, the detorque value of the fastening crown screws was measured. The mean tensile strength value of CC in the Abut11 group was 131.9 ± 13.5 N and, in the Abut5 group was 230.9 ± 11.3 N; while the detorque mean value in samples with SC 5.8 ± 1.8 N for the Abut11 group and, 7.6 ± 1.1 N for Abut5 group. Significant statistical differences were found between the two groups in both situations tested (p < 0.05). The multifunctional abutments, presenting a lesser angulation of the crown-seating portion, showed higher values of retention of the CC and a lesser screw loosening of torque of the fixing screws in the SC after the application of cyclic loads when compared to the abutments with more angulation in the crown-seating portion.
本研究的目的是评估一种用于莫氏锥度种植体连接的新型多功能基台，相对于在粘结和螺丝固位冠施加循环载荷后的固位稳定性。测试了在冠就位部分具有两种不同角度的多功能基台，形成2组（每组n = 30个样本）：Abut11组，使用角度为11.42°的智能基台；Abut5组，使用角度为5°的理想基台。每组的15个样本接受粘结冠（CC），另外15个接受螺丝固位冠（SC）。所有冠样本在4 Hz频率和150 N载荷下进行360,000次循环的机械循环测试。带有CC的样本进行拉伸测试以去除冠，而对于带有SC的样本，测量固定冠螺丝的拧松扭矩值。Abut11组中CC的平均拉伸强度值为131.9±13.5 N，Abut5组中为230.9±11.3 N；而Abut11组中带有SC的样本的拧松扭矩平均值为5.8±1.8 N，Abut5组中为7.6±1.1 N。在两种测试情况下，两组之间均发现有显著统计学差异（p < 0.05）。与冠就位部分角度更大的基台相比，冠就位部分角度较小的多功能基台在施加循环载荷后，CC的固位值更高，SC中固定螺丝的扭矩拧松更少。
