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Morphometric evaluation of changes in the alveolar bone and roots of the maxillary anterior teeth before and after en masse retraction using cone-beam computed tomography
ارتودنسی
Orthodontics
پژوهشي
Research
<p> <strong>Objective:</strong> </p><p> To evaluate the morphometric changes in the alveolar bone and roots of the maxillary anterior teeth (MXAT) after en masse retraction with maximum anchorage (EMR-MA). </p><p> <strong>Materials and Methods:</strong></p><p> The samples consisted of 37 female adult patients who had Class I dentoalveolar protrusion (CI-DAP) and were treated by extraction of the first premolars and EMR-MA. Using three-dimensional cone-beam computed tomography taken before treatment and after space closure, the maxillary central incisors (MXCI, N = 66), lateral incisors (MXLI, N = 69), and canines (MXC, N = 69) were superimposed using individual reference planes. After alveolar bone area (ABA), vertical bone level (VBL), root length (RL), root area (RA), and prevalence of dehiscence (PD) were measured at the cervical, middle, and apical levels, statistical analyses were performed. </p><p> <strong>Results:</strong> </p><p> On the palatal side, ABA significantly decreased in all levels of MXAT (P < .001 middle of MXC, P < .01). MXCI and MXLI exhibited a greater decrease in the ratio of change in palatal ABA than did MXC (cervical, P < .01 middle and apical, P < .05 total, P < .001). Palatal/labial ABA ratios decreased in MXCI (cervical, middle, total, P < .001 apical, P < .05) and MXLI (cervical, P < .001 apical, P < .05). They showed greater amounts and ratios of change in VBL on the palatal side compared to the labial side (all P < .001). The palatal side showed more PD in the cervical area than did the labial side (MXCI and MXLI, P < .001 MXC, P < .01). Significant root resorption occurred in MXAT (RL and RA, all P < .001). </p><p> <strong>Conclusions:</strong></p><p> During EMR-MA in cases with CI-DAP, ABA and VBL on the palatal side and RL and RA of MXCI and MXLI were significantly decreased. </p><hr><p></p><p> <strong>Source: </strong>The Angel Orthodontists</p><p> <a href="http://www.angle.org/doi/abs/10.2319/041812-325.1" target="_blank"><font color="#0000ff">Full Text</font></a></p>
Alveolar bone, Root, Maxillary anterior teeth, En masse retraction, Extraction space closure, 3D-CBCT
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http://idai.ir/browse.php?a_code=A-10-32-1935&slc_lang=fa&sid=1
Hyo-Won
Ahn
10031947532846009080
10031947532846009080
No
Department of Orthodontics, School of Dentistry, Seoul National University, Seoul, South Korea
Sung Chul
Moon
10031947532846009081
10031947532846009081
No
Department of Orthodontics, School of Dentistry, Seoul National University, Seoul, South Korea
Seung-Hak
Baek
drwhite@unitel.co.kr
10031947532846009082
10031947532846009082
Yes
Department of Orthodontics, School of Dentistry, Dental Research Institute, Seoul National University, Seoul, South Korea