Custom Morse taper zirconia abutments: Influence on marginal fit and torque loss before and after thermomechanical cycling

Autor(es)

Mauricio Moris, Izabela Cristina ^[1] ; Lapria Faria, Adriana Claudia ^[1] ; Ribeiro, Ricardo Faria ^[1] ; Fok, Alex Sui-Lun ^[2] ; Silveira Rodrigues, Renata Cristina ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Dent Mat & Prosthodont, Dent Sch Ribeirao Preto, Av Cafe S-N, BR-14040904 Ribeirao Preto, SP - Brazil

^[2] Univ Minnesota, Sch Dent, Minnesota Dent Res Ctr Biomat & Biomech, 16-212 Moos Hlth Sci Tower 515 Delaware SE, Minneapolis, MN 55455 - USA

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS; v. 78, p. 241-245, FEB 2018.
• Citações Web of Science: 0

Resumo

The use of zirconia abutments has increased because of aesthetics, but sometimes customization is necessary and its effect is unclear. This study evaluated the marginal fit and torque loss of customized and non-customized aesthetic zirconia abutments associated with Morse taper implants before and after thermomechanical cycling. Twenty-four implant/abutment/crown sets were divided into three groups (N = 8): Zr - non-customized zirconia abutments, Zrc - customized zirconia abutments, and Ti - titanium abutments. The ceramic crowns of the upper canines were made. All of the abutments were tightened with 15-N.cm torque, and the crowns were cemented on the abutments. The misfits and torque loss were measured before and after thermomechanical cycling. The marginal fit was evaluated in two planes throughout 10 different slices, 30 measurements for each face (i.e., buccal, palatal, mesial and distal) and 120 measurements for each sample. A load of 100 N, a frequency of 2 Hz and 1000,000 cycles with temperature variation of 5 degrees 55 degrees C were used for thermomechanical cycling. Thermomechanical cycling significantly decreased the marginal misfit only with the Zrc (p = 0.002), and the Ti was significantly different from the Zr and Zrc before and after thermomechanical cycling. Thermomechanical cycling did not affect the torque losses of the groups, but a significant difference between the Zr and Zrc (p = 0.0345) before cycling was noted. Customization of zirconia abutments does not significantly affect torque loss and marginal misfit after thermomechanical cycling suggesting that they can be safe for clinical utilization. (AU)

• Processo FAPESP: 12/00407-0 - Análise da adaptação e perda de torque após a ciclagem termomecânica e resistência à fratura de pilares de zircônia para implantes cone morse.
• Beneficiário: IZABELA CRISTINA MAURICIO MORIS RIVERA
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 10/20632-3 - Análise biomecânica in vitro de pilares estéticos de zircônia personalizados e não personalizados submetidos à ciclagem termo-mecânica
• Beneficiário: Renata Cristina Silveira Rodrigues Ferracioli
• Modalidade de apoio: Auxílio à Pesquisa - Regular