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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Mechanical Stress Analysis of Different Configurations of the All-on-4 Concept in Atrophic Mandible: A 3D Finite Element Study

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Author(s):
Santana, Luis Carlos L. [1] ; Guastaldi, Fernando Pozzi S. [1, 2] ; Idogava, Henrique T. [3] ; Noritomi, Pedro Y. [4] ; De Foggi, Camila C. [5, 6] ; Vaz, Luis G. [5]
Total Authors: 6
Affiliation:
[1] Sao Paulo State Univ Unesp, Sch Dent, Dept Diag & Surg, BR-1680 Araraquara, SP - Brazil
[2] Massachusetts Gen Hosp, Dept Oral & Maxillofacial Surg, Boston, MA 02114 - USA
[3] State Univ Campinas Unicamp, Fac Mech Engn, Dept Integrated Syst, Campinas, SP - Brazil
[4] Renato Archer Informat Technol Ctr, 3D Technol Core, Campinas, SP - Brazil
[5] Sao Paulo State Univ UNESP, Sch Dent, Dept Dent Mat & Prosthodont, Araraquara, SP - Brazil
[6] Fed Univ Sao Carlos UFSCar, Chem Dept, Sao Carlos, SP - Brazil
Total Affiliations: 6
Document type: Journal article
Source: INTERNATIONAL JOURNAL OF ORAL & MAXILLOFACIAL IMPLANTS; v. 36, n. 1, p. 75-85, JAN-FEB 2021.
Web of Science Citations: 0
Abstract

Purpose: This study evaluated the mechanical behavior of different configurations of the All-on-4 treatment concept designed with straight short (6-mm-length), straight standard (11-mm-length), or tilted standard (30-degree angled; 11-mm-length) posterior implants. Materials and Methods: The All-on-4 configurations were performed in atrophic mandible models and consisted of anterior straight standard and posterior tilted standard implants (H1 model), anterior straight standard and posterior straight short implants (H2 model), and anterior and posterior straight standard implants (H3 model). Three oblique forces of 100 N were simulated in the posterior region of the prosthetic bar. The values of stress were obtained for the ductile materials using the von Mises equivalent stress (sigma(vm)) criteria. The stress peaks in the peri-implant bone crest were measured by the maximum (sigma(max)) and minimum (sigma(min)) principal stresses. The two-way analysis of variance (two-way ANOVA) and Tukey post hoc tests determined significant differences (P < .01) of stress values among the ductile materials (implant and prosthetic components). Results: The use of tilted standard posterior implants (H1 model) showed the lowest values of sigma(max) and sigma(min) in the posterior region of the peri-implant bone area. On the other hand, the use of straight short (H2 model) or straight standard (H3 model) posterior implants significantly reduced the von Mises mean stresses in the bar screws, abutments, and abutment screws (P < .01). Conclusion: The higher odds of technical failures (screw fracture/loosening) may be expected when the All-on-4 configuration is performed with tilted standard posterior implants. Also, peri-implant bone overload may occur when the All-on-4 design is performed with straight short or straight standard posterior implants in atrophic mandibles. (AU)

FAPESP's process: 14/16688-4 - Development and biological evaluation of a new calcium phosphate with and without fibrin sealant: an in vivo study in rabbits and in vitro study
Grantee:Fernando Pozzi Semeghini Guastaldi
Support Opportunities: Scholarships in Brazil - Post-Doctoral