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Assessment of mini-implant displacement using cone beam computed tomography
Matheus Alves1, Carolina Baratieri1, Lincoln Issamu Nojima1
1Department of Orthodontics, Faculty of Dentistry, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
Objectives:
To assess, through cone beam computed tomography (CBCT), the mini-implants' stability and behaviour when submitted to orthodontic force during upper molars' intrusion.
Material And Methods:
Forty-one mini-implants were divided into two groups: 30 in the buccal and palatal mini-implants group (BPMI), inserted into buccal and palatal sides, and 11 in the midpalatal mini-implants group (MPMI), inserted into midpalatal suture. One day after insertion, a 200 gf was applied on the mini-implants during a 5-month period. CBCT was performed twice: before force application (CBCT 1) and 5 months later (CBCT 2). For mini-implant displacement assessment, the distance of mini-implants' head (HMI) and tail (TMI) to coronal, sagittal and axial planes was measured at CBCT 1 and 2.
Results:
For the BPMI group, the displacement rate was statistically significant (P<0.05) in all three dimensions for both the head and the tail. For the MPMI group, the displacement rate was statistically significant (P<0.05) only in the antero-posterior (head and tail) and vertical (head) dimensions.
Conclusions:
Buccal, palatal and midpalatal mini-implants showed some displacement (mean value ≤0.78) when submitted to force, although they are aimed to provide stable skeletal anchorage.
