Fatigue Failure of External Hexagon Connections on Cemented Implant-Supported Crowns

Author(s)

Barbosa, Joao Malta ^{[1, 2]} ; da Rocha, Daniel Navarro ^[3] ; Hirata, Ronaldo ^[4] ; Freitas, Gileade ^[5] ; Bonfante, Estevam A. ^[6] ; Coelho, Paulo G. ^[7]

Affiliation

^[1] NYU, Dept Prosthodont, New York, NY - USA

^[2] NYU, Coll Dent, Dept Biomat & Biomimet, 433 1st Ave, Room 844, New York, NY 10010 - USA

^[3] Mil Inst Engn, Dept Mat Sci, Rio De Janeiro, RJ - Brazil

^[4] NYU, Dept Biomat & Biomimet, New York, NY - USA

^[5] Univ Sao Paulo, Ribeirao Preto Dent Sch, Dept Oral & Maxillofacial Surg, Ribeirao Preto, SP - Brazil

^[6] Univ Sao Paulo, Bauru Sch Dent, Dept Prosthodont & Periodontol, Bauru, SP - Brazil

^[7] NYU, Tandon Sch Engn, Hansjorg Wyss Dept Plast Surg, Mech & Aerosp Engn, Dept Biomat & Biomimet, Langone Med Ctr, New York, NY - USA

• Document type: Journal article
• Source: IMPLANT DENTISTRY; v. 27, n. 2, p. 165-170, APR 2018.
• Web of Science Citations: 1

Abstract

Purpose: To evaluate the probability of survival and failure modes of different external hexagon connection systems restored with anterior cement-retained single-unit crowns. The postulated null hypothesis was that there would be no differences under accelerated life testing. Materials and Methods: Fiftyfour external hexagon dental implants (similar to 4 mm diameter) were used for single cement-retained crown replacement and divided into 3 groups: (3i) Full OSSEOTITE, Biomet 3i (n = 18); (OL) OEX P4, Osseolife Implants (n = 18); and (IL) Unihex, Intra-Lock International (n = 18). Abutments were torqued to the implants, and maxillary central incisor crowns were cemented and subjected to step-stress-accelerated life testing in water. Use-level probability Weibull curves and probability of survival for a mission of 100,000 cycles at 200 N (95% 2-sided confidence intervals) were calculated. Stereo and scanning electron microscopes were used for failure inspection. Results: The beta values for 3i, OL, and IL (1.60, 1.69, and 1.23, respectively) indicated that fatigue accelerated the failure of the 3 groups. Reliability for the 3i and OL (41% and 68%, respectively) was not different between each other, but both were significantly lower than IL group (98%). Abutment screw fracture was the failure mode consistently observed in all groups. Conclusion: Because the reliability was significantly different between the 3 groups, our postulated null hypothesis was rejected. (AU)

• FAPESP's process: 16/18818-8 - Multi-User Equipment approved in grant 2012/19078-7: ElectroPuls E3000 Linear-Torsion All-Electric dynamic test instrument package
• Grantee: Estevam Augusto Bonfante
• Support Opportunities: Multi-user Equipment Program
• FAPESP's process: 12/19078-7 - Development and processing of Al2O3-ZrO2 translucent composite for CAD/CAM monolithic prostheses: the effect of aging on biaxial flexural strength
• Grantee: Estevam Augusto Bonfante
• Support Opportunities: Research Grants - Young Investigators Grants