Implant-Abutment Misfit after Cyclic Loading: An In Vitro Experimental Study

Autor(es)

de Vasconcelos, John Eversong Lucena ; De Matos, Jefferson David Melo ; Queiroz, Daher Antonio ; Lopes, Guilherme da Rocha Scalzer ; De Lacerda, Bruna Caroline Goncalves Vasconcelos ; Bottino, Marco Antonio ; Turssi, Cecilia Pedroso ; Basting, Roberta Tarkany ; do Amaral, Flavia Lucisano Botelho ; Franca, Fabiana Mantovani Gomes

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS; v. 15, n. 15, p. 12-pg., 2022-08-01.

Resumo

This study aimed to evaluate the influence of thermomechanical cycling (TMC) and type of abutment on the misfit and compressive strength of the implant-abutment interface. Forty 3.75-mm external hexagon implants with 25 degrees angled abutments were divided into four groups (N = 10). Group A: overcast plus TMC; Group B: overcast without TMC; Group C: completely cast plus TMC; Group D: completely cast without TMC. Abutments were fixed to the implants with 32-Ncm torque, and groups A and C specimens were cyclically loaded at 80 N with 2 Hz for 1 million cycles. The misfit on the implant-abutment interface was evaluated by optical microscope (100x) and the compressive strength test was performed in a universal test machine. For statistical analysis, a two-way ANOVA and post hoc Tukey test were used. There was no difference in misfit presented by all the abutments in the absence of TMC (p > 0.05). When TMC was performed, the completely cast abutments showed greater misfit than overcast ones (p = 0.001). Regarding compressive strength, irrespective of TMC performed, the overcast abutments showed higher compressive strength values than completely cast abutments (p = 0.003). Moreover, disregarding the type of abutment used, the absence of TMC provided higher compressive strength values (p < 0.001). It was concluded that thermomechanical cyclic loading aggravated the misfit, especially in completely cast abutments, regardless of material or fabrication technique, and reduced the compressive strength of the two types of abutments tested. (AU)

• Processo FAPESP: 21/11499-2 - Comportamento biomecânico e sobrevivência em fadiga de implantes de titânio e zircônia suportados sobre coroas unitárias de zircônia
• Beneficiário: Jefferson David Melo de Matos
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 19/24903-6 - Análise comparativa entre implantes de titânio e cerâmica policristalina, na sobrevivência em fadiga e comportamento biomecânico
• Beneficiário: Jefferson David Melo de Matos
• Modalidade de apoio: Bolsas no Brasil - Doutorado