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Reliability and failure modes of internal conical dental implant connections
Author(s) -
FreitasJúnior Amilcar C.,
Almeida Erika O.,
Bonfante Estevam A.,
Silva Nelson R.F.A.,
Coelho Paulo G.
Publication year - 2013
Publication title -
clinical oral implants research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.407
H-Index - 161
eISSN - 1600-0501
pISSN - 0905-7161
DOI - 10.1111/j.1600-0501.2012.02443.x
Subject(s) - abutment , implant , reliability (semiconductor) , conical surface , orthodontics , dentistry , implant failure , fatigue testing , materials science , dental abutments , post hoc , medicine , structural engineering , engineering , composite material , surgery , physics , power (physics) , quantum mechanics
Objective Biological and mechanical implant‐abutment connection complications and failures are still present in clinical practice, frequently compromising oral function. The purpose of this study was to evaluate the reliability and failure modes of anterior single‐unit restorations in internal conical interface ( ICI ) implants using step‐stress accelerated life testing ( SSALT ). Materials and methods Forty‐two ICI implants were distributed in two groups ( n = 21 each): group AT –OsseoSpeed ™ TX (Astra Tech, Waltham, MA, USA); group SV –Duocon System Line, Morse Taper (Signo Vinces Ltda., Campo Largo, PR, Brazil). The corresponding abutments were screwed to the implants and standardized maxillary central incisor metal crowns were cemented and subjected to SSALT in water. Use‐level probability W eibull curves and reliability for a mission of 50,000 cycles at 200 N were calculated. Differences between groups were assessed by K ruskal– W allis along with B onferroni's post‐hoc tests. Polarized‐light and scanning electron microscopes were used for failure analyses. Results The Beta (β) value derived from use level probability W eibull calculation was 1.62 (1.01–2.58) for group AT and 2.56 (1.76–3.74) for group SV , indicating that fatigue was an accelerating factor for failure of both groups. The reliability for group AT was 0.95 and for group SV was 0.88. K ruskal– W allis along with B onferroni's post‐hoc tests showed no significant difference between the groups tested ( P > 0.27). In all specimens of both groups, the chief failure mode was abutment fracture at the conical joint region and screw fracture at neck's region. Conclusions Reliability was not different between investigated ICI connections supporting maxillary incisor crowns. Failure modes were similar.