Evaluation of screw loosening on new abutment screws and after successive tightening

Brazilian Dental Journal

Gustavo Seabra Barbosa¹  João Paulo Da Silva-neto²  Paulo Cezar Simamoto-júnior²  Flávio Domingues Das Neves²  Maria Da Gloria Chiarello De Mattos²  Ricardo Faria Ribeiro² 

[1] ,Federal University of Rio Grande do Norte Dental School Department of OcclusionNatal RN ,Brazil

关键词: dental implants;    screws loosening;    abutment;   

DOI  :  10.1590/S0103-64402011000100009

来源: SciELO

【 摘 要 】

This study evaluated the loss of the torque applied after use of new screws and after successive tightening. Four infrastructures (IE), using UCLA castable abutment type, were cast in cobalt-chromium alloy and new abutment screws (G1) were used in a first moment. Subsequently, the same abutment screws were used a second time (G2) and more than two times (G3). The values of the torques applied and detorques were measured with a digital torque wrench to obtain the values of initial tightening loss (%). Data were analyzed by ANOVA and Tukey's test (?=0.05). Significant differences were observed between the G1 (50.71% ± 11.36) and G2 (24.01% ± 3.33) (p=0.000) and between G1 (50.71% ± 11.36) and G3 (25.60% ± 4.64) (p=0.000). There was no significant difference between G2 and G3 (p=0.774). Within the limitations of the study, it may be concluded that the percentage of the initial torque loss is lower when screws that already suffered the application of an initial torque were used, remaining stable after application of successive torques.

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