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

Author(s)

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

Affiliation

^[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

• Document type: Journal article
• Source: JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS; v. 78, p. 241-245, FEB 2018.
• Web of Science Citations: 0

Abstract

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)

• FAPESP's process: 12/00407-0 - Analysis of misfit and torque loss after thermomechanical cycling and fracture resistance of zirconia abutments for morse cone implants.
• Grantee: IZABELA CRISTINA MAURICIO MORIS RIVERA
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 10/20632-3 - In vitro biomechanical analysis of esthetical zirconia abutments, personalized and not-personalized, submitted to thermo-mechanical cycling
• Grantee: Renata Cristina Silveira Rodrigues Ferracioli
• Support Opportunities: Regular Research Grants