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Symmetry 2018, 10(12), 762; https://doi.org/10.3390/sym10120762

Evaluation of the Cortical Deformation Induced by Distal Cantilevers Supported by Extra-Short Implants: A Finite Elements Analysis Study

1
Department of Fixed Prosthodontics, Faculty of Dentistry, Universidad Nacional de Córdoba, Córdoba 5000, Argentine
2
Department of Oral Biology, Faculty of Dentistry, Universidad Nacional de Córdoba, Córdoba 5000, Argentine
3
Department of Prosthodontics, School of Dental Dental Medicine, Stony Brook, NY 1103, USA
4
Department of Dental Research in Universidad Federico Henríquez y Carvajal (UFHEC), Santo Domingo 10107, Dominicana Republic
5
Department of Oral and Implant Surgery, Faculty of Health Sciences, Universidad Católica San Antonio de Murcia (UCAM), Murcia 30002, Spain
*
Author to whom correspondence should be addressed.
Received: 10 November 2018 / Revised: 7 December 2018 / Accepted: 11 December 2018 / Published: 17 December 2018
(This article belongs to the Special Issue Dental Implant Macrogeometry and Biomaterials)
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Abstract

Background: The aim of the study was to analyze the distribution of stresses caused by an axial force in a three-dimensional model with the finite element method in the implant-supported fixed partial denture with distal overhang (PPFIVD) on short dental implants in the posterior edentulous maxilla. Methods: geometrical models of the maxilla with a bone remnant of 9 and 5 mm were created. Straumann SP® (Base, Switzerland) implants were placed in the premolar area. Two groups with subgroups were designed. Group A (GA): PPFIVD on two implants (GA1: 4.1 × 8 mm and GA2: 4.1 × 4 mm); Group B (GB): PPFIVD on the single implant (GB1: 4.1 × 8 mm and GB2: 4.1 × 4 mm). It was applied to a static force of 100 N to 30°. Results: PPFIVD on two implants reached the maximum tension in GA2 with respect to GA1; the difference was not significant in implants. In the maxilla GA2 was lower in relation to GA1; the difference was not significant. In PPFIVD over an implant, the stress was greater in GB2 with respect to GB1; the difference was significant in maxilla and implants. Peri-implant bone micro deformations and prosthesis-implant displacements were observed. Conclusions: PPFIVD over short splinted implants could be viable in the maxilla with reduced bone height, being an option when lifting the floor of the maxillary sinus. The rehabilitation with unitary implant (4 mm) did not provide adequate results. The dominant tensions evidenced bone micro-distortions with a displacement of the prosthesis-implant set. The real statement of this paper was to define that short splinted implants can be used in soft bone with high success rate in reducing bending forces. View Full-Text
Keywords: short dental implant; finite element analysis; distal cantilever; implant-supported partial fixed prosthesis; microdeformations; displacements; geometric model; maxilla short dental implant; finite element analysis; distal cantilever; implant-supported partial fixed prosthesis; microdeformations; displacements; geometric model; maxilla
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Fernández-Bodereau, E.; Flores, V.Y.; Delgado-Ruiz, R.A.; Aragoneses, J.M.; Calvo-Guirado, J.L. Evaluation of the Cortical Deformation Induced by Distal Cantilevers Supported by Extra-Short Implants: A Finite Elements Analysis Study. Symmetry 2018, 10, 762.

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