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Updated: May 15, 2026
An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
Published on: February 10, 2014
Fracture resistance of soft tissue level implants after cyclic loading and external modification
Louis DiPede1, Abdulmohsin Alhashim, T K Vaidyanathan
1Department of Restorative Dentistry, New Jersey Dental School, University of Medicine and Dentistry of New Jersey, Newark, NJ, USA.
Statement Of Problem:
The exposure of the implant collar in the esthetic zone is a challenging complication of implant dentistry. The preparation of the exposed implant collar to create room for restorative material may decrease the strength of the abutment/implant assembly.
Purpose:
The purpose of this in vitro study was to evaluate the effect on the failure load of preparing a 0.5-mm chamfer finish line on an implant collar at various apical depths.
Material And Methods:
Thirty solid abutments and 30 implants were screwed into a customized metal mold at a 30-degree angle to the vertical axis. An intact group (IN) (control) (n=10) had no preparation, experimental group P1 had a 0.5-mm chamfer margin placed 1 mm apical to the implant/abutment interface, and experimental group P2 had the margin placed 2 mm apical. The specimens were subjected to a fatigue loading of 200 N for 1 000 000 cycles. Unfractured specimens were then loaded until failure. Mean fracture load (MFL) values were compared with 1-way ANOVA, and the Tukey test was used to identify differences among groups (α=.05).
Results:
One specimen from both the IN and P1 groups and 2 specimens from the P2 group failed after fatigue loading. Significant differences in the MFL values were found between the IN group (3825) and P1 group (2944), P<.001 and between the IN group and the P2 group (2553), P<.001.
Conclusions:
The mean load required to fracture the abutment/implant assembly decreased significantly after various amounts of implant collar preparation.
