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Implant–abutment interface design affects fatigue and fracture strength of implants
Author(s) -
Steinebrunner Lars,
Wolfart Stefan,
Ludwig Klaus,
Kern Matthias
Publication year - 2008
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.1600-0501.2008.01581.x
Subject(s) - abutment , implant , materials science , fracture (geology) , tube (container) , orthodontics , dentistry , structural engineering , composite material , medicine , engineering , surgery
Objectives: Failures of implant–abutment connections are relatively frequent clinical problems. The aim of this study was to evaluate the influence of long‐term dynamic loading on the fracture strength of different implant–abutment connections. Material and methods: Six implant systems were tested: two systems with external connections (Brånemark, Compress) and four systems with internal connections (Frialit‐2, Replace‐Select, Camlog, Screw‐Vent). Fracture strength was tested in two subgroups for each system: one subgroup with ( dyn ) and the other without prior dynamic loading ( contr ). Each subgroup consisted of eight specimens with standard implant–abutment combinations for single molar crowns. Dynamic loading was performed in a two‐axis chewing simulator with 1,200,000 load cycles at 120 N. Results: Median fracture strengths in Newton (N) and 25th and 75th percentiles [in brackets] were: Brånemark: dyn =729 [0;802]/ contr =782 [771;811], Frialit‐2: dyn =0 [0;611]/ contr =887 [798;941], Replace‐Select: dyn =1439 [1403;1465]/ contr =1542 [1466;1623], Camlog: dyn =1482 [1394;1544]/ contr =1467 [1394;1598], Screw‐Vent: dyn =0 [0;526]/ contr =780 [762;847] and Compress: dyn =818[0;917]/ contr =1008 [983;1028]. In some dyn subgroups, failures of the implant–abutment connection occurred already during dynamic loading: three specimens of the Brånemark and Compress groups and six specimens of the Screw‐Vent and the Frialit‐2 groups failed during dynamic loading. Statistically significant differences ( P ≤0.05) in fracture strength could be found between groups with different connection designs. Conclusion: Implant systems with long internal tube‐in‐tube connections and cam–slot fixation showed advantages with regard to longevity and fracture strength compared with systems with shorter internal or external connection designs.