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Updated: Dec 24, 2025
An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
Published on: February 10, 2014
Primary stability of narrow-diameter dental implants with a multiple condensing thread design placed in bone with and
Georgios E Romanos1,2, Jessica Lau1, Rafael Delgado-Ruiz3
1Department of Periodontology, Laboratory for Periodontal-, Implant-, Phototherapy (LA-PIP), School of Dental Medicine, Stony Brook University, Stony Brook, New York, USA.
Background:
The authors hypothesized that there is no difference in the primary stability (PS) of multiple condensing thread design (MCTD) implants placed in simulated type-IV bone with and without using osteotomes.
Purpose:
This in vitro study assessed the PS of narrow-diameter dental implants with MCTD placed in simulated soft (type-IV) bone with and without using osteotomes.
Materials And Methods:
Sixty MCT-designed implants (diameter: 3.0 mm; length: 11.5 mm) were placed using 800 rpm drilling speed in cellular rigid polyurethane foam bone-blocks that simulated type-IV bone. Prior to placement, the implants were divided into three groups (20 implants per group) depending upon the protocol used for osteotomy preparation-Group-1: Conventional drilling (CD); Group-2: CD followed by osseous condensation using a chisel-shaped tapered osteotome with maximum diameter of 3 mm; and Group-3: CD followed by osseous condensation using a cylindrical osteotome with maximum diameter of 3 mm. Abutments were connected to all implants and PS was recorded using resonance frequency analysis (RFA) and the periotest (PTV). Group comparisons were performed using analysis and Bonferroni post-hoc adjustment tests. Level of significance was set at P < .05.
Results:
There was no statistically significant difference in the RFA values for the MCT-designed implants placed in groups 1, 2, and 3 (59.85 ± 0.72, 59.67 ± 0.76 and 59.42 ± 0.92, respectively). There was no statistically significant difference in the PTV values for MCT-designed implants in groups 1, 2, and 3 (1.655 ± 0.82, 1.405 ± 0.57, and 1.078 ± 0.63, respectively).
Conclusion:
The MCTD implants with narrow diameters have a high PS in artificial soft bone in vitro. Due to the condensation effect of the thread design, there is no need for additional condensation of the peri-osteotomy bone in order to improve implant stability.
