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Relation between implant/abutment vertical misfit and torque loss of abutment screws

2008; Fundação Odontológica de Ribeirão Preto; Volume: 19; Issue: 4 Linguagem: Inglês

10.1590/s0103-64402008000400013

1806-4760

Gustavo Augusto Seabra Barbosa, Sérgio Rocha Bernardes, Flávio Domingues das Neves, Alfredo Júlio Fernandes Neto, Maria da Glória Chiarello de Mattos, Ricardo Faria Ribeiro,

Dental materials and restorations

This study investigated whether there is a direct correlation between the level of vertical misfit at the abutment/implant interface and torque losses (detorque) in abutment screws. A work model was obtained from a metal matrix with five 3.75 x 9 mm external hex implants with standard platform (4.1 mm). Four frameworks were waxed using UCLA type abutments and one-piece cast in commercially pure titanium. The misfit was analyzed with a comparator microscope after 20 Ncm torque. The highest value of misfit observed per abutment was used. The torque required to loose the screw was evaluated using a digital torque meter. The torque loss values, measured by the torque meter, were assumed as percentage of initial torque (100%) given to abutment screws. Pearson's correlation (α=0.05) between the misfit values (29.08 ± 8.78 µm) and the percentage of detorque (50.71 ± 11.37%) showed no statistically significant correlation (p=0.295). Within the limitations of this study, it may be concluded that great vertical misfits dot not necessarily implies in higher detorque values.