In vitro performance of implant-supported monolithic zirconia crowns: Influence of patient-specific tooth-coloured abutments with titanium adhesive bases. Issue 7 (July 2015)

• Record Type: Journal Article
• Authors: Rosentritt, Martin; Rembs, Andreas; Behr, Michael; Hahnel, Sebastian; Preis, Verena
• Is Part Of: Journal of dentistry. Volume 43:Issue 7(2015:Jul.)
• Page Start: 839
• Page End: 845
• Publication Date: 2015-07
• Subjects: Dentistry -- Periodicals; Dentistry -- Periodicals; Dentisterie -- Périodiques; Electronic journals; 617.6005
• DOI: 10.1016/j.jdent.2015.04.011
• Languages: English
• ISSNs: 0300-5712

Abstract

<abstract abstract-type="author" id="abs0005"> <title id="sect0005">Abstract</title> <sec> <title id="sect0010">Objective</title> <p id="spar0005">To investigate the influence of the combination of patient-specific abutments and titanium adhesive bases on the long-term in vitro performance of anterior crowns.</p> </sec> <sec> <title id="sect0015">Methods</title> <p id="spar0010">Ten systems of screw-retained implant and adhesive base combinations (<italic>n</italic> = 8/group) were restored with zirconia or polyetherketone (PEEK) abutments and identical full-anatomical zirconia crowns. For simulating clinical anterior loading, implants were fixed at an angle of 135° and submitted to prolonged thermal cycling and mechanical loading (TC: 6 × 3000 cycles, 5 °C/55 °C; ML: 100 N, 3.6 × 10<sup>6</sup> cycles) to cause and register fatigue failure. Failed restorations were examined by means of scanning electron microscopy. Surviving restorations were loaded to fracture. Data (mean ± standard deviation) were statistically analyzed (ANOVA; Bonferroni; Kaplan–Meier-Log-Rank; <italic>α</italic> = 0.05).</p> </sec> <sec> <title id="sect0020">Results</title> <p id="spar0015">Seven systems survived TCML without any failure. The other three systems showed loosening and fracturing of the screw (0.4–1.6 × 10<sup>6</sup> loadings) or debonding between base and abutment (0.002–3.4 × 10<sup>6</sup> loadings). None of the systems showed any fracture of the crown or failed bonding between abutment and crown. The Log-Rank test showed significant (<italic>p</italic> = 0.000) differences. Fracture data significantly varied (ANOVA <italic>p</italic> = 0.000) between the individual systems (minimum: 371 N; maximum: 763 N). Failures were mostly caused by bending or fracturing of the screw and in three cases by fracture of the abutment.</p> </sec> <sec> <title id="sect0025">Conclusions</title> <p id="spar0020">Anterior implant-supported zirconia crowns on titanium adhesive bases and bonded patient-specific zirconia abutments provided good in vitro performance and high fracture resistance. Sufficient high torque moments and early re-screwing may be advised.</p> </sec> <sec> <title id="sect0030">Clinical relevance</title> <p id="spar0025">Most adhesive base and abutment combinations may be appropriate for anterior application. Individual improvements may contribute to enduring success.</p> </sec> </abstract>