Utilisation raisonnée des mini-implants d’ancrage dans la correction des classes II subdivisions pour une approche globale

2021 ◽  
Vol 55 (2) ◽  
pp. 223-259
Author(s):  
Caroline Cazenave
Keyword(s):  
Cone Beam ◽  
Mini Implants ◽  
Approche Globale

La classe II subdivision est une malocclusion complexe d’origine multifactorielle, beaucoup mieux définie depuis quelques années avec l’imagerie 3D. Moins de la moitié des classes II subdivision prend son origine dans une déviation d’une des deux arcades, maxillaire ou mandibulaire, le restant mettant en jeu des mécanismes de mise en place fonctionnels beaucoup plus complexes. Les mécaniques de distalisation sur ancrage squelettique ont apporté une réponse évidente aux besoins de symétrisation des arcades. Mais les mini-implants d’ancrage ont également largement démontré leur intérêt dans le contrôle tridimensionnel des arcades. Ainsi, par le biais du plan d’occlusion, la croissance peut être réorientée, la mandibule repositionnée. Le cone-beam permet désormais de cibler notre action en nous offrant une meilleure lecture des phénomènes de bascule et de torsion d’arcade rencontrés. Cet article a pour objectif de proposer une approche globale des classes II subdivision, mécano-occluso-fonctionnaliste.

scholarly journals A comparative study between currently used methods and Small Volume-Cone Beam Tomography for surgical placement of mini implants

2014 ◽  
Vol 85 (3) ◽  
pp. 446-453 ◽  
Author(s):  
Melissa Landin ◽  
Aniket Jadhav ◽  
Sumit Yadav ◽  
Aditya Tadinada
Keyword(s):  
Small Volume ◽  
Preoperative Evaluation ◽  
Three Dimensional ◽  
Panoramic Radiograph ◽  
Imaging Modalities ◽  
Cone Beam ◽  
Root Structure ◽  
Mini Implants ◽  
Area Of Interest ◽  
Human Skulls

ABSTRACT Objective:  To compare the outcome of mini implant placement by four different methods: blind placement, a single periapical radiograph (PA), a single panoramic radiograph, and a small-volume cone-beam computed tomography (SV-CBCT). Our hypothesis was that SV-CBCT, with its high resolution, low radiation dose, and three-dimensional depiction of area of interest would yield superior diagnostic information in assessing the potential anchorage site compared to currently used methods that often result in undesired root perforations. Materials and Methods:  Potential mini implant sites of 20 dentate or partially dentate human skulls were imaged using three different imaging modalities: PA, panoramic radiograph, and SV-CBCT. Mini implants were placed in 10 maxillary and 10 mandibular randomized sites blindly and using each of the three imaging modalities. Large-volume CBCT scans done postoperatively were used to detect root perforation. Two oral radiologists analyzed the images for perforation of root structures at each site. Results:  There was significantly (P < .05) less root perforation with SV-CBCT when compared with other imaging modalities. Fifty-five percent of mini implants placed blindly, 60% of mini implants placed using PA, and 50% of mini implants placed using a panoramic radiograph perforated a root structure, whereas only 5% of mini implants placed using SV-CBCT perforated a root structure. Conclusions:  Preoperative evaluation of potential mini implant insertion sites using SV-CBCT aids in predictable placement and results in the least amount of root perforation.

scholarly journals Quantitative evaluation of palatal bone thickness to guide miniscrews insertion: a CBCT assessment

HU Revista ◽  
2020 ◽  
Vol 46 ◽  
pp. 1-8
Author(s):  
Rodrigo César Santiago ◽  
Carolina De Sá Werneck ◽  
Fernanda Ramos de Faria ◽  
Robert Willer Farinazzo Vitral ◽  
Marcio José Da Silva Campos
Keyword(s):  
Anterior Part ◽  
Regions Of Interest ◽  
Cone Beam ◽  
Bone Thickness ◽  
Computed Tomographic ◽  
Mini Implants ◽  
Incisive Foramen ◽  
The Mean ◽  
Palatal Bone ◽  
A Site

Introduction: The use of mini-implants has become common in orthodontic practice as it has increased the possibility of skeletal anchorage. The palate constitutes a site of choice for the insertion of miniscrews purposes because it is a site with relatively safety with appropriate bone thickness and less suitability for inflammation. Aim: To quantitatively evaluate the thickness of the palatal bone for miniscrews insertion. Material and Methods: Forty-seven sets of cone beam computed tomographic (CBCT) images were selected. The sample consisted of cone beam computed tomography from 47 patients (20 male, 27 female; mean age 22.4 years old/± 3.01 years). Palatal bone thickness (PBT) was measured in millimeters (mm) with 5 regions of interest (ROIs) which were determined used the coronal reconstructions of the patatal area: 4, 6, 8 and 10 mm posterior to the incisive foramen were evaluated. A total of 940 ROIs were evaluated. RESULTS: Significant differences were observed for PBT between various palatal sections (p<.01). The thickest area (6.31-7.03 mm) was found in the anterior part of the palate. The mean bone thicknesses in the 6, 8 and 10 mm sections were significantly less than those observed at 4 mm from the incisive foramen. Conclusions: The thickness of the palatal bone is progressively thinner from the palatine foramen to the posterior region. Transversally, the bone was thicker in the palatine suture than in paramedian areas, mainly in the coronal reconstructions located more laterally.

Vertical Measurements for Planning Palatal Mini-Implants in Lateral Radiography and Cone Beam Computed Tomography

2014 ◽  
pp. 1 ◽  
Author(s):  
Gabriella Lopes de Rezende Barbosa ◽  
Laura Ricardina Ramírez-Sotelo ◽  
Débora de Melo Távora ◽  
Solange Maria de Almeida
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Cone Beam ◽  
Mini Implants
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