Evaluation of tensile strength after insertions andremovals of abutments on frictional Morse taper implants

• Published in: International journal of odontostomatology 2021-06, Vol.15 (2), p.356-362
• Main Authors: da-Silva, Jader Moreira, Sobral, Brenda Santos, Cabral, Carolina Takis, Souza, Cíntia de Melo Silva, Fonseca, Ricardo Roberto de Souza, Ramacciato, Juliana Cama
• Format: Article
• Language: English
• Subjects: DENTISTRY, ORAL SURGERY & MEDICINE
• ISSN: 0718-381X; 0718-381X
• DOI: 10.4067/S0718-381X2021000200356

This study aimed to evaluate possible changes in final retention after nine sequences of insertion and removal (SIR) of a frictional Morse taper implant/abutment system, evaluating the force required for dissociating this set between sequences, and verifying possible deformations in the implant heads. Ten implants, 13 mm long and 3.3 mm in diameter, were coupled to a universal mechanical testing machine. Ten anti-rotational abutments, 13 mm long and 3.5 mm in diameter, were connected to the implants parallel to the long axis, using an instrument called beat-connection, and subjected to tensile tests and SEM analysis. The results were analyzed using the Kruskal-Wallis test with Dunn’s post-test, and the significance level was set at 5 %. There was no statistically significant difference in final retention among the nine SIRs evaluated. The force needed to uncouple the abutment from the implant increased as SIRs were performed on all ten implants, and an increase of 29.03 % was observed in the ninth SIR compared to the first SIR. After SEM analysis, no significant deformations, fractures, or cracks were observed in the implant heads.