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

Author(s)

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

• Document type: Journal article
• Source: MATERIALS; v. 15, n. 15, p. 12-pg., 2022-08-01.

Abstract

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)

• FAPESP's process: 21/11499-2 - Biomechanical behavior and fatigue survival of two: piece titanium and zirconia implants supporting zirconia single crowns
• Grantee: Jefferson David Melo de Matos
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 19/24903-6 - Comparative analysis between titanium implants and polycrystalline ceramics in survival on fatigue and biomechanical behavior
• Grantee: Jefferson David Melo de Matos
• Support Opportunities: Scholarships in Brazil - Doctorate