Avaliação da confiabilidade mecânica de diferentes interfaces implante/componente para próteses unitárias de acordo com o protocolo de teste de fatiga ISO 14801
Aluno: André Felipe Torres Gomes
Orientador(a): Dr. Geninho Thomé
The aim of this in vitro study was to evaluate the mechanical behavior in cyclic fatigue of different implant/abutment connections, and the unitary indication of abutments for all regions of the mouth. This experimental study according to international standards (UNI EN ISO 14801:2007) was done using 5 types of implants and abutments: G1: External Hex Smart Implant and 17° universal abutment; G2: Cortical External Hex Implant and 17° universal abutment; G3: Internal Hex Implant and 30° universal abutment; G4: Morse taper Implant (11.5 degrees) and 17° universal abutment; G5: Morse taper Implant (16 degrees) and 30° universal abutment. A 15-Hz cyclic loading was applied to the specimens with the maximum number of cycles set to 5 x 106. It was defined success when three samples have supported 5 million cycles without failure. The maximum load supported from each group after dynamic loading was recorded. The Spearman correlation and the Lowess method were used to analyze the correlation between the number of cycles and the applied load and the Kruskal-Wallis and Nemenyi tests for comparison between the abutments when reaching 5 million cycles. There was a negative correlation (r <0.00) and significant (P <0.05) between the number of cycles and the load for each type of implant/abutment. The load values supported by each group after cyclic loading to achieve 5 million cycles were: G1 – 225 N; G2 – 215 N; G3 – 220 N; G4 – 210 N and G5 – 240 N. The GM implant/abutment assemblie (G5) presented a significantly higher load (p-value = 0.024) than the CM implant/abutment assemblie (G4). All implant/abutment connections investigated in this study resisted average bite force values reported as acceptable in the literature and may be indicated for any region of the mouth.