Abstracts (08)
Evaluation of The Retention of Endodontic Implants
C. Maniatopoulos, R.M. Pilliar, and D.C. Smith
Faculty of Dentistry, University of Toronto
J Prosthet Dent 1988;59:438-446
Studies evaluating the retention of endodontic implants have revealed that threaded surfaces lead to superior strength. Judy et al. and Zmener reported substantially stronger retention for threaded endodontic implants compared with smooth-tapered implants in vitro for single-rooted human teeth. Similar results for threaded endodontic dowels compared with smooth-tapered dowels were also reported. These studies also were performed in vitro and tensile tests were used to evaluate retention.
In addition, the effect of the cement on retention has been studied. Standlee et al. reported greater retention for smooth-tapered dowels with zinc phosphate compared with polycarboxylate and epoxy cements. Conversely, Young et al. reported superior retention for smooth-tapered cast dowels with polycarboxylate cement compared with zinc phosphate. Finally, Hanson and Caputo reported improved retention for serrated dowels with cyanoacrylate compared with zinc phosphate and polycarboxylate cements. However, other studies did not indicate the effects of different cements on the retention of implants or dowels.
This study investigated the retentive strength of endodontic implants measured by forced removal (pull-out or push-out) as a function of implant design and cement. A smooth-tapered implant, a threaded implant, and a new porous-surfaced endodontic implant were evaluated. Porous-surfaced implants have been examined for orthopaedics and dentistry to improve fixation at the implant-bone interface by direct bone ingrowth or by an interlock with an intermediary grout or bone cement. Our study also explored the potential advantages of this design in endodontics.
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