Faculty, Staff and Student Publications
Publication Date
8-3-2022
Journal
Materials
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° 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 (100×) 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.
Keywords
implant-supported fixed dental prostheses, dental implants, biomechanics
DOI
10.3390/ma15155341
PMID
35955276
PMCID
PMC9369688
PubMedCentral® Posted Date
8-3-2022
PubMedCentral® Full Text Version
Post-print
Recommended Citation
de Vasconcelos, John Eversong Lucena; de Matos, Jefferson David Melo; Queiroz, Daher Antonio; Lopes, Guilherme da Rocha Scalzer; de Lacerda, Bruna Caroline Gonçalves Vasconcelos; Bottino, Marco Antonio; Turssi, Cecilia Pedroso; Basting, Roberta Tarkany; do Amaral, Flávia Lucisano Botelho; and França, Fabiana Mantovani Gomes, "Implant-Abutment Misfit after Cyclic Loading: An In Vitro Experimental Study" (2022). Faculty, Staff and Student Publications. 79.
https://digitalcommons.library.tmc.edu/uthdb_docs/79
Published Open-Access
yes
