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Abstract
Introduction: For the complete rehabilitation of fully edentulous mandibles, the option of immediate loading determines the use of temporary prostheses that immobilize the installed implants. Although temporary prostheses with reinforcement provide rehabilitation with biomechanical benefits, the failure to adopt this recommendation coexists in different studies on immediate restorations.
Objective: This study evaluates a type of prosthesis to restore jaws using the all-on-four concept.
Material and method: The mechanical behavior of the prostheses with the modified structure was evaluated in vitro, under a unilateral mechanical flexion test in cantilever. Two representative groups were included in the all-on-four concept, with a G1 test group (n = 10) containing modified structures and a G2 control group (n = 10) that included complete acrylic prostheses. The samples were subjected to thermocycling with 500 cycles (5 ° ± 2 ° C for 30 s and 55 ° ± 2 ° for 30 s) and the mechanical flexion test on the cantilever.
Result: The Mann-Whitney test revealed a significant difference between G1 and G2 (p <0.001). In the descriptive evaluation, G1 showed an average of 830.50 N until the initial fracture of the resin, while the control group had an average of 403.58N. Maximum resistance to complete fracture was recorded in G1, with an average of 903.03N, while in G2, an average of 435.20N was recorded. The vertical linear component of flexion was 0.68 mm and 0.39 mm until the initial bar fracture, respectively for G1 and G2.
Conclusion: The modified structure for the all-on-four protocol determined better mechanical performance when compared to the same model of complete acrylic prosthesis
References
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Este artigo é uma cópia com adaptação para o português do Artigo Original "SILVA, Vanessa Araujo, et al. "Biomechanical development and evaluation of a new framework for all-on-four rehabilitation." Revista de Odontologia da UNESP 48 (2019)." Esta Cópia com adaptação para o Português segue os preceitos Creative Commons CC BY 4.0 ( https://creativecommons.org/licenses/by/4.0/deed.pt_BR ) disponibilizado pelo periódico responsável pela publicação original ( https://www.scielo.br/scielo.php?script=sci_arttext&pid=S1807-25772019000100412 ).
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Copyright (c) 2020 Vanessa Araujo SILVA , Allyson Henrique de Andrade FONSECA , Dimitri Ribas FONSECA , Paulo Isaías SERAIDARIAN