Caballero Claudia, Rodriguez Fernando, Cortellari Guillermo Castro, Scarano Antonio, Prados-Frutos Juan Carlos, De Aza Piedad N, Fernandes Gustavo Vicentis Oliveira, Gehrke Sergio Alexandre
Department of Implantology, Bioface/Postgrados en Odontología/Universidad Catolica de Murcia, 11100 Montevideo, Uruguay.
Department of Innovative Technologies in Medicine & Dentistry, University of Chieti-Pescara, 66013 Chieti, Italy.
J Funct Biomater. 2024 Jun 28;15(7):177. doi: 10.3390/jfb15070177.
The present study evaluated the mechanical behavior of five designs of Morse taper (MT) connections with and without the application of loads. For this, the detorque of the fixing screw and the traction force required to disconnect the abutment from the implant were assessed. A total of 100 sets of implants/abutments (IAs) with MT-type connections were used, comprising five groups ( = 20/group): (1) Group Imp 11.5: IA sets with a cone angulation of 11.5°; (2) Group SIN 11.5: with a cone angulation of 11.5°; (3) Group SIN 16: with a cone angulation of 16°; (4) Group Neo 16: with a cone angulation of 16°; and (5) Group Str 15: with a cone angulation of 15°. All sets received the torque recommended by the manufacturer. After applying the torque, the counter torque of the fixing screws was measured in ten IA sets of each group without the application of cyclic loads (frequencies ≤ 2 Hz, 360,000 cycles, and force at 150 Ncm). The other ten sets of each group were subjected to cyclic loads, after which the detorque was measured. Afterwards, the force for disconnection between the implant and the abutment was measured by traction on all the samples. The untwisting of the abutment fixation screws showed a decrease in relation to the initial torque applied in all groups. In the unloaded samples, it was found to be -25.7% in Group 1, -30.4% in Group 2, -36.8% in Group 3, -29.6% in Group 4, and -25.7% in Group 5. After the applied loads, it was found to be -44% in Group 1, -43.5% in Group 2, -48.5% in Group 3, -47.2% in Group 4, and -49.8% in Group 5. The values for the IA sets were zero for SIN 16 (Group 3) and Neo16 (Group 4), both without and with loads. In the other three groups, without loads, the disconnection value was 56.3 ± 2.21 N (Group 1), 30.7 ± 2.00 N (Group 2), and 26.0 ± 2.52 N (Group 5). After applying loads, the values were 63.5 ± 3.06 N for Group 1, 34.2 ± 2.45 N in Group 2, and 23.1 ± 1.29 N in Group 5. It was concluded that in terms of the mechanical behavior of the five designs of MT IA sets, with and without the application of loads, the Imp 11.5, SIN 11.5, and Srt 15 groups showed better results compared to the SIN 16 and Neo 16 groups, showing that lower values of cone angulation increase the friction between the parts (IA), thus avoiding the need to maintain the torque of the fixing screw to maintain the union of the sets.
本研究评估了五种莫氏锥度（MT）连接设计在加载和未加载情况下的力学行为。为此，评估了固定螺钉的拧松扭矩以及将基台与种植体分离所需的牵引力。总共使用了100套具有MT型连接的种植体/基台（IA），分为五组（每组 = 20）：（1）Imp 11.5组：锥角为11.5°的IA套件；（2）SIN 11.5组：锥角为11.5°；（3）SIN 16组：锥角为16°；（4）Neo 16组：锥角为16°；（5）Str 15组：锥角为15°。所有套件均施加了制造商推荐的扭矩。施加扭矩后，在每组十个未施加循环载荷（频率≤2 Hz、360,000次循环、力为150 Ncm）的IA套件中测量固定螺钉的反扭矩。每组的另外十个套件承受循环载荷，之后测量拧松扭矩。然后，通过对所有样本进行牵引来测量种植体与基台之间的分离力。基台固定螺钉的拧松显示，与所有组中最初施加的扭矩相比有所降低。在未加载的样本中，第1组为-25.7%，第2组为-30.4%，第3组为-36.8%，第4组为-29.6%，第5组为-25.7%。施加载荷后，第1组为-44%，第2组为-43.5%，第3组为-48.5%，第4组为-47.2%，第5组为-49.8%。对于SIN 16（第3组）和Neo16（第4组）的IA套件，无论有无载荷，其值均为零。在其他三组中，无载荷时，分离值分别为第1组56.3±2.21 N、第2组30.7±2.00 N和第5组26.0±2.52 N。施加载荷后，第1组的值为63.5±3.06 N，第
