Abstract
Step-stress accelerated life testing (SSALT) and fractographic analysis were performed to evaluate the reliability and failure modes of dental implant fabricated by machining (surface treated with alumina blasting/acid etching) or laser sintering for anterior single-unit replacements. Forty-two dental implants (3.75 × 10 mm) were divided in two groups (n = 21 each): laser sintered (LS) and alumina blasting/acid etching (AB/AE). The abutments were screwed to the implants and standardized maxillary central incisor metallic crowns were cemented and subjected to SSALT in water. Use-level probability Weibull curves and reliability for a mission of 50,000 cycles at 200 N were calculated. Polarized light and scanning electron microscopes were used for failure analyses. The Beta (β) value derived from use-level probability Weibull calculation of 1.48 for group AB/AE indicated that damage accumulation likely was an accelerating factor, whereas the β of 0.78 for group LS indicated that load alone likely dictated the failure mechanism for this group, and that fatigue damage did not appear to accumulate. The reliability was not significantly different (p > 0.9) between AB/AE (61 %) and LS (62 %). Fracture of the abutment and fixation screw was the chief failure mode. No implant fractures were observed. No differences in reliability and fracture mode were observed between LS and AB/AE implants used for anterior single-unit crowns.
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The authors are thankful to A.B. Dental Devices Ltd. (Ashdod, Israel) and Marotta Dental Studio (Farmingdale, NY, USA) for their support.
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Almeida, E.O., Júnior, A.C.F., Bonfante, E.A. et al. Reliability evaluation of alumina-blasted/acid-etched versus laser-sintered dental implants. Lasers Med Sci 28, 851–858 (2013). https://doi.org/10.1007/s10103-012-1170-8
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DOI: https://doi.org/10.1007/s10103-012-1170-8