Avaliação mecânica da estabilidade de parafusos protéticos em diferentes sistemas de retenção pilar/implante / Mechanical evaluation of the prosthetic screw stability from different implant/abutment retention systems

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The preload screw variation for the first five minutes after each one of five torque/untorque sequences from different implant/abutment retention systems was evaluated. Strain gauges were attached over the cervical third of external hex, internal hex and Morse taper implants. A controlled torque/untorque procedure allowed the record from the preload and untorque values of the samples in each one of the sequences. Thirty implant/abutment samples, divided in eight groups were studied: external hex implants with Universal post and titanium screws (Neodent, Curitiba, Brazil) screwed to 32 N.cm (EH.Ti.32); external hex, Universal post, DLC covered screw, 32 N.cm (EH.dlc.32); internal hex, Universal post, titanium screw, 20 N.cm (IH.Ti.20); Morse taper, single piece Universal post, 20 N.cm (MT.OP.20); Morse taper, single piece Universal post, 32 N.cm (MT.OP.32); Morse taper, Universal post trespassing screw, 10 N.cm (MT.TS.10); the same samples from the MT.TS.10 group were used for the seventh group, screwed to 10 N.cm, but the untorque was performed by the abutment (MT.TS.10.A); the same samples used with the MT.TS.10 and the MT.TS.10.A were used for the last group, but the screws were tightened to 15 N.cm and the untorque remained by the abutment (MT.TS.15.A). The mean and the stardad deviation (DP) found for the preloss in all the five sequences were of: EH.Ti.32 (27.75; SD 7.70); EH.dlc.32 (40.17; SD 10.16); IH.Ti.20 (219.61; SD 75.47); MT.OP.20 (129.19; SD 116.71); MT.OP.32 (137.97; SD 47.53); MT.TS.10 (39.55; SD 13.96); MT.TS.10.A (126.72; SD 44.05); MT.TS.15.A (194.41; SD 68.48). For the retention systems studied, it could be concluded that: there are single relations between screw untorque and preload over the implant cervical third, these are directely influenced by the implant/abutment interface design, screw type and torque value; there were not found post screw preload loss, neither torque resistance at the anti-rotational direction from the screws after the first five minutes in five torque/untorque sequences.

ASSUNTO(S)

screw implante dentário implant/abutment interface parafuso interface pilar/implante torque dental implant pré-carga torque preload

ACESSO AO ARTIGO

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