Effects of implant morphology on rotational stability during immediate implant placement in the esthetic zone
AUTHOR
-- By Kan JY, Roe P,
Rungcharassaeng K.
Purpose: Primary implant
stability is critical to achieving implant success, especially in a situation
with immediate implant placement and provisionalization (IIPP) when bone
quality and quantity are compromised. The purpose of this study was to examine
the effects of implant morphology (tapered vs cylindric) and the final
drill-implant diameter discrepancy (FD-IDD) of six implant systems on the
incidence of rotational instability during IIPP in the esthetic zone.
Materials and methods: One hundred seventy-one implants in 112 patients were evaluated.
Implants that exhibited inadequate resistance to the torque generated by the
surgeon's hand during implant placement were classified as rotationally
unstable.
Results: The
overall incidence of rotational instability for the tapered implants (1.1%) was
significantly lower than that exhibited by the cylindric (nontapered) implants
(20.5%). Among the cylindric implants, those with < 0.5 mm FD-IDD
experienced a significantly higher incidence of rotational instability (36.6%)
than groups with ≥ 0.5 mm FD-IDD. The incidence of rotational instability of
cylindric implants with ≥ 0.5 mm FD-IDD was significantly greater than that of
the tapered implants with a comparable FD-IDD.
Conclusion: Within the confines of this study, the use
of a tapered implant with an FD-IDD of ≥ 0.5 mm minimized the incidence of
rotational implant instability for the IIPP procedure.
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