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Comparison of Stability between Cylindrical and Conical TypeMini-Implants Mechanical and Histologic Properties

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Authors
Kim, Jong-Wan; Baek, Seung-Hak; Kim, Tae-Woo; Chang, Young-Il
Issue Date
2008-07
Publisher
H Angle Education and Research Foundation
Citation
Angle Orthod. 2008;78(4):692-698
Keywords
Mini-implantCylindricalConicalStabilityMechanicalHistomorphometric
Abstract
Objective: To investigate the mechanical and histologic properties of conical compared with cylindrical
shaped mini-implants in terms of the success rate.
Materials and Methods: The samples consisted of cylindrical and conical groups, and commonly
had 1.6 mm diameter and 6.0 mm length (Jeil Medical Corporation, Seoul, Korea) placed in beagle
dogs. The mechanical study for analyzing maximum insertion torque (MIT), maximum removal
torque (MRT), and torque ratio (TR; MRT/MIT) in Sawbones (Pacific Research Laboratories Inc,
Vashon, Wash), and the animal study for resonance frequency analysis (RFA) and histomorphometric
analysis (bone-to-implant contact and bone area) in two beagle dogs were done. All measurements
were statistically evaluated using independent t-tests to determine any difference in
MIT, MRT, TR, RFA, bone-to-implant contact (BIC), and bone area (BA) between the cylindrical
group and conical group. A P value less than 0.05 was considered significant.
Results: The conical group showed significantly higher MIT and MRT than the cylindrical group
in the mechanical study. However, there was no significant difference in RFA, BIC, and BA between
the two groups in the animal and histomorphometric studies.
Conclusions: Although the conical shaped mini-implant could induce tight contact to the adjacent
bone tissue and might produce good primary stability, the conical shape may need modification
of the thread structure and insertion technique to reduce the excessive insertion torque while
maintaining the high resistance to removal.
ISSN
0003-3219
Language
English
URI
https://hdl.handle.net/10371/66613
DOI
https://doi.org/10.2319/060407-266.1
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College of Dentistry/School of Dentistry (치과대학/치의학대학원)Dept. of Dentistry (치의학과)Journal Papers (저널논문_치의학과)
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