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Arnetzl, GV; Payer, M; Falkensammer, F; Arnetzl, G.
Effect of double conical abutment screw on implant preload.
Clin Oral Implants Res. 2016; 27(5):553-557
Web of Science PubMed FullText FullText_MUG


Autor/innen der Med Uni Graz:
Arnetzl Gerwin
Falkensammer Frank
Payer Michael

Dimensions Citations:

Plum Analytics:
This study compared the loosening torque of experimental double conical abutment screws to that of conventional conical abutment screws and flat-head screws in implants with internal connections before and after mechanical loading. Eighty implant-screw-abutment assemblies were divided into four groups: flat-head screw (Xive S), conical screw (Straumann), conical screw (Nobel Biocare), and double conical screw (RTB). Abutments were tightened to a torque of 30 Ncm. After 10 min, they were retightened and loosening torque was measured. The same abutments were then retightened with new screws to a torque of 30 Ncm and, again, retightened after 10 min. They were then mechanically loaded for 3 000 000 cycles, and loosening torque was again measured. Data were collected, and an exploratory analysis was performed. Comparisons before mechanical cycling showed significant differences between groups. After mechanical cycling, only the comparisons of Straumann and Nobel Biocare showed no significant differences. Considering the same group before and after mechanical cycling, all comparisons showed significant differences. The shape of the abutment screw head significantly influenced loosening torque: Double conical-head screws showed significantly higher loosening torque values than conical-head screws. Conical-head screws showed higher loosening torque values than conventional flat-head screws before and after loading. © 2015 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.
Find related publications in this database (using NLM MeSH Indexing)
Bone Screws -
Dental Abutments -
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Dental Stress Analysis -
Humans -
Torque -

Find related publications in this database (Keywords)
abutment screw design
implant abutments
implant preload
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