Implant—Abutment Misfit after Cyclic Loading: An In Vitro Experimental Study
John Eversong Lucena de Vasconcelos,
Jefferson David Melo de Matos,
Daher Antonio Queiroz,
Guilherme da Rocha Scalzer Lopes,
Bruna Caroline Gonçalves Vasconcelos de Lacerda,
Marco Antonio Bottino,
Cecilia Pedroso Turssi,
Roberta Tarkany Basting,
Flávia Lucisano Botelho do Amaral,
Fabiana Mantovani Gomes França
Affiliations
John Eversong Lucena de Vasconcelos
Department of Implantology, College of Dentistry CECAPE, Juazeiro do Norte 63024-015, CE, Brazil
Jefferson David Melo de Matos
Department of Implantology, College of Dentistry CECAPE, Juazeiro do Norte 63024-015, CE, Brazil
Daher Antonio Queiroz
The University of Texas Health Science Center, Department of Restorative Dentistry & Prosthodontics, Houston (UTHealth) School of Dentistry, Houston, TX 77054, USA
Guilherme da Rocha Scalzer Lopes
Department of Biomaterials, Dental Materials, and Prosthodontics, Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos 05508-070, SP, Brazil
Bruna Caroline Gonçalves Vasconcelos de Lacerda
Department of Implantology, College of Dentistry CECAPE, Juazeiro do Norte 63024-015, CE, Brazil
Marco Antonio Bottino
Department of Biomaterials, Dental Materials, and Prosthodontics, Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos 05508-070, SP, Brazil
Cecilia Pedroso Turssi
Dental Research Center, São Leopoldo Mandic Institute, Campinas 13045-755, SP, Brazil
Roberta Tarkany Basting
Dental Research Center, São Leopoldo Mandic Institute, Campinas 13045-755, SP, Brazil
Flávia Lucisano Botelho do Amaral
Dental Research Center, São Leopoldo Mandic Institute, Campinas 13045-755, SP, Brazil
Fabiana Mantovani Gomes França
Dental Research Center, São Leopoldo Mandic Institute, Campinas 13045-755, SP, Brazil
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.
