Abstract
Abstract Introduction Implant inclinations can be corrected using mini abutments at different angulations. Objective To analyze the influence of external hexagon implants in different inclinations (3 levels) on the microstrain distribution generated around three implants. Method A geometric bone model was created through Rhinoceros CAD software (version 5.0 SR8, Mcneel North America, Seattle, WA, USA). Three implants (4.1 × 13 mm) were modeled and inserted inside the substrate at three different inclinations: 0º, 17º and 30º. Next, all groups received mini conical abutments, fixation screws and a simplified prosthesis. The final geometry was exported in STEP format to analysis software and all materials were considered homogeneous, isotropic and linearly elastic. An axial load (300N) was applied on the center of the prosthesis. An in vitro study was conducted with same conditions and groups for validating the tridimentional model. Result Stress was concentrated on the external area of the implants, in contact with the cortical bone and external hexagon. For the bone simulator, the strain increased in the peri-implant region according to the increase in the implant’s inclination. The difference between groups was significant (p = 0.000). The 30º group presented higher stress and strain concentration. Conclusion The microstrain and stress increase around implants directly proportional to the increase of the installation angle.
Highlights
Implant inclinations can be corrected using mini abutments at different angulations
In clinical situations where dental implants are inclined inside bone tissue, the use of angulation-correcting abutments may be an alternative for prosthesis installation[1,2,3]
There are no reports in the literature of more extensive situations in which all implants were angled and their angulation was corrected by these prosthetic pieces
Summary
Implant inclinations can be corrected using mini abutments at different angulations. Objective: To analyze the influence of external hexagon implants in different inclinations (3 levels) on the microstrain distribution generated around three implants. In clinical situations where dental implants are inclined inside bone tissue, the use of angulation-correcting abutments may be an alternative for prosthesis installation[1,2,3]. The decision to install an inclined implant can be scientifically based on several articles that evaluated inclined implants in anterior regions, with reduced occlusal load and contact on the prosthetic crown’s palatine face[8,9,10]. These studies mostly express a common clinical situation and provide the dentist with an initial basis that inclined implants aggravate the strain generated around the supporting tissue, but the physiological limit is still maintained[9]. There are no reports in the literature of more extensive situations in which all implants were angled and their angulation was corrected by these prosthetic pieces
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