Tightening techniques for the retaining screws of universal abutment
Técnicas de aperto para parafusos de retenção do pilar universal
Regalin, Alexandre Wittcinski; Alessandretti, Rodrigo; Federizzi, Leonardo; Gomes, Érica Alves; Bacchi, Atais; Spazzin, Aloísio Oro
Abstract
Purpose: This study evaluated the torque maintenance of universal abutment retaining screws using different tightening techniques, and coated or uncoated screws. Material and method: The screws were tightened to implants as following: Control – 32 Ncm torque; H20 – holding 32 Ncm torque for 20 s; R – 32 Ncm torque, repeated after 10 min (retorque); and H20+R – combining the two tightening techniques. Titanium and coated screws were also evaluated. Result: Statistical analysis showed higher maintained torque for titanium screws (p<0.001). The H20+R technique showed the highest maintained torque (p=0.003), but the H20 technique’s maintained torque was similar. Conclusion: Titanium screws associating the two tightening techniques can improve maintained torque.
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Resumo
Objetivo: Este estudo avaliou a manutenção do torque de parafusos de retenção do pilar universal utilizando diferentes técnicas de aperto e parafusos com ou sem revestimento. Material e método: Os parafusos foram apertados nos implantes da seguinte forma: Controle – 32 Ncm de torque; H20 – segurando os 32 Ncm de torque por 20 s; R – 32 Ncm de torque, repetido após 10 min (retorque); e H20+R – combinando as duas técnicas de aperto. Foram também avaliados parafusos de titânio com e sem revestimento da rosca. Resultado: A análise estatística mostrou maior manutenção do torque de parafusos de titânio (p<0,001). A técnica H20+R apresentou a maior manutenção do torque (p=0,003), semelhante a manutenção do torque da técnica H20. Conclusão: Parafusos de titânio combinando as duas técnicas de aperto pode melhorar a manutenção do torque.
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References
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