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Published on: February 23, 2024
Cone-beam computed tomography evaluation of mini-implants after placement: Is root proximity a major risk factor for
Seong-Hun Kim1, Seok-Man Kang, Yong-Suk Choi
1Department of Orthodontics, Kyung Hee University, Seoul, Korea. bravortho@khu.ac.kr
Introduction:
The purposes of this study were to determine factors favoring successful mini-implant placement and to evaluate root proximity as a possible risk factor for failure of osseointegration-based mini-implants during orthodontic treatment.
Methods:
Three-dimensional cone-beam computed tomography images were used to examine 50 sandblasted, large-grit, and acid-etched surface-treated mini-implants (C-implant, Seoul, Korea) placed in 25 patients. The images were analyzed for 3-dimensional position of the mini-implant (placement angle and depth) and any contact with root surfaces or maxillary sinuses.
Results:
There were no remarkable differences in horizontal placement angles in the axial plane and placement depths of the mini-implants, but the vertical placement angle was significantly higher on the left side (24.5 degrees +/- 11.0 degrees ) compared with the right side (11.8 degrees +/- 11.6 degrees ). The horizontal mini-implant placement angle had a greater inclination tendency toward the maxillary first molar, and 11 mini-implants with root proximity showed mesiobuccal contact with the maxillary first molar root. Only 1 failure in 15 mini-implants with root proximity and 1 failure in 35 without root proximity were observed on the images.
Conclusions:
Root proximity alone was not considered a major risk factor for osseointegration-based mini-implant failure.
