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

Autor: de Vasconcelos JEL; Department of Implantology, College of Dentistry CECAPE, Juazeiro do Norte 63024-015, CE, Brazil.; Dental Research Center, São Leopoldo Mandic Institute, Campinas 13045-755, SP, Brazil., de Matos JDM; Department of Implantology, College of Dentistry CECAPE, Juazeiro do Norte 63024-015, CE, Brazil.; Center for Dental Biomaterials, Department of Restorative Dental Sciences, University of Florida (UF Health), Gainesville, FL 32611, USA.; 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., Queiroz DA; The University of Texas Health Science Center, Department of Restorative Dentistry & Prosthodontics, Houston (UTHealth) School of Dentistry, Houston, TX 77054, USA., Lopes GDRS; 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., de Lacerda BCGV; Department of Implantology, College of Dentistry CECAPE, Juazeiro do Norte 63024-015, CE, Brazil.; Dental Research Center, São Leopoldo Mandic Institute, Campinas 13045-755, SP, Brazil., Bottino MA; 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., Turssi CP; Dental Research Center, São Leopoldo Mandic Institute, Campinas 13045-755, SP, Brazil., Basting RT; Dental Research Center, São Leopoldo Mandic Institute, Campinas 13045-755, SP, Brazil., do Amaral FLB; Dental Research Center, São Leopoldo Mandic Institute, Campinas 13045-755, SP, Brazil., França FMG; Dental Research Center, São Leopoldo Mandic Institute, Campinas 13045-755, SP, Brazil.
Jazyk: angličtina
Zdroj: Materials (Basel, Switzerland) [Materials (Basel)] 2022 Aug 03; Vol. 15 (15). Date of Electronic Publication: 2022 Aug 03.
DOI: 10.3390/ma15155341
Abstrakt: 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.
Databáze: MEDLINE
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