Abstract
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 (alpha=0.05) between the misfit values (29.08 +/- 8.78 microm) 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.
Highlights
The implant/abutment interface has been referred to as a significant factor in stress transference, possible adverse biological response and complications on prosthetic rehabilitation [1]
The purpose of the present study was to investigate whether there is a direct correlation between the level of vertical misfit at the abutment/implant interface and torque losses in abutment screws
The present work evaluated the influence of vertical misfit in one-piece five-element frameworks at the percentage of torque losses applied
Summary
The implant/abutment interface has been referred to as a significant factor in stress transference, possible adverse biological response and complications on prosthetic rehabilitation [1]. The fabrication of implant components and the effects of clinical and laboratorial phases can contribute to misfit between implant and prosthesis [2,3]. Two possible complications emerge from this scenario: 1) biological - increase of the load transfer to the bone, and presence of mucosal inflammation due to the development of microflora in the micro-gap between the implant and the abutment with subsequent bone loss; and 2) prosthetic - loosening/ fracture of implant and/or prosthesis [4].
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