Finite Element Analysis of Stress in Anterior Prosthetic Rehabilitation with Zirconia Implants with and without Cantilever

Abstract

Objectives The aim of this study was to evaluate using finite element analysis (FEA), the stress distribution in prostheses (lithium disilicate crowns) on monotype zirconia implants with and without cantilever in the anterior region of the maxilla. Materials and Methods From a virtual reconstruction of bone model of the toothed maxilla from a computed tomography, three models (groups) were created: Zr (11–21)—implants placed in the area of 11 and 21 with cantilever; Zr (12–22)—implants placed in the area of 12 and 22 without cantilever; and Zr (11–22)—implants intercalated placed in the area of 11 and 22. In all models, monotype zirconia implant (4.1 × 12.0 mm) was used in single-body configuration. Lithium disilicate crowns were designed on the implants and pontics for all groups. A 150-N load was applied to the prostheses. The materials used were considered isotropic, homogeneous, and linearly elastic. FEA was performed to evaluate the maximum (tensile) and minimum (compressive) principal stresses in the implant, crowns, and bone tissue. Data were analyzed qualitatively and quantitatively. Results For all groups, the highest maximum principal stress occurred in the palatal cervical area of the implant, with the high values for the Zr (12–22) group and the low values for the Zr (11–21) group. The maximum principal stress was concentrated in the cervical palatal area of the crown, with the Zr (11–21) group presented the highest values and the Zr (12–22) group showed the lowest values. In the bone tissue all the groups presented similar values of maximum and minimal principal stress, with the palatal (maximum principal) and vestibular (minimum principal) close to the cervical of the implants the area with the highest concentration of stresses. Conclusions The position of monotype zirconia implant did not interfere in the bone tissue stress, and the implants placed in the 11–21 present lower stress in implants and higher in the crown. The cantilever does not increase the stress in the implants, crown, and bone tissue.

Análise computacional da distribuição de sobrecargas oclusais exercidas sobre implantes de zircônia

“…A metodologia da análise por elementos finitos foi realizada em três etapas: pré-processamento (criação do modelo computacional), processamento (cálculo matemático da simulação de elementos finitos) e pós-processamento (coleta e análise dos resultados) (Henrique et al, 2021;Tsumanuma et al, 2021).…”

“…Para as construções dos modelos foi necessário configurar a simulação com informações representativas de todos os materiais analisados, como módulo de elasticidade, e definir as condições de contorno, com o objetivo de reproduzir as condições reais. As estruturas dos modelos foram divididas em um número finito de elementos, os quais foram interconectados por pontos nodais que se encontram no sistema de coordenadas tridimensional, sendo o conjunto resultante denominado malha (Henrique et al, 2021;Tsumanuma et al, 2021).…”

“…Imagens da mandíbula dentada artificial foram obtidas por meio de tomografia computadorizada (i-CAT Cone Beam 3D Dental Imaging System, Imaging Sciences International, Hatfield, PA, EUA) para a construção dos modelos ósseos. As imagens obtidas por meio da tomografia computadorizada foram utilizadas como base para a construção computacional da região posterior da mandíbula (25 mm altura x 15 mm largura mésio-distal x 15 mm profundidade buco-lingual), sendo construída por tecido ósseo do tipo três (fina camada de osso cortical -1,0mm -em torno de um osso trabecular) com relação a sua densidade (Henrique et al, 2021;Tsumanuma et al, 2021).…”

“…As imagens dos componentes protéticos foram obtidas por meio de banco de dados. Os modelos em elementos finitos foram construídos com auxílio do software elementos finitos (SolidWorks ANSYS Workbench 14.0; Swanson Analysis Inc) para a análise biomecânica (processamento) (Henrique et al, 2021;Tsumanuma et al, 2021).…”

Stress behavior of an anterior single implant restored with high‐performance polymer abutments under immediate and delayed loading: A 3D FEA study

“…[15][16][17][18] Previous studies have evaluated the stress accumulation on anteriorly placed implants and peripheral bone by using FEA. 4,9,[19][20][21][22] However, the data on the stress accumulation points when high-performance polymers are used as abutment materials are insufficient. 23 To the authors' knowledge only 1 study, which was in vitro, has ever compared PEEK and PEKK as hybrid implant abutments.…”