Evaluation of the changes of orbital cavity volume and shape after tooth-borne and bone-borne rapid maxillary expansion (RME)

Abstract

Objective To assess and compare volumetric and shape changes of the orbital cavity in patients treated with tooth-borne (TB) and bone-borne (BB) rapid maxillary expansion (RME). Study design Forty adolescents with bilateral maxillary cross-bite received tooth-borne (TB group = 20; mean age 14.27 ± 1.36 years) or bone-borne (BB group = 20; mean age of 14.62 ± 1.45 years) maxillary expander. Cone-beam computed tomography (CBCT) were taken before treatment (T1) and 6-month after the expander activation (T2). Volumetric and shape changes of orbital cavities were detected by referring to a specific 3D digital technology involving deviation analysis of T1/T2 CBCT-derived models of pulp chamber. Student’s t tests were used to 1) compare T1 and T2 volumes of orbital cavities in TB and BB groups, 2) compare volumetric changes and the percentage of matching of 3D orbital models (T1-T2) between the two groups. Results Both TB and BB groups showed a slight increase of the orbital volume (0.64 cm3 and 0.77 cm3) (p < 0.0001). This increment were significant between the two groups (p < 0.05) while no differences were found in the percentage of matching of T1/T2 orbital 3D models (p > 0.05). The areas of greater changes were detected in the proximity of the frontozygomatic and frontomaxillary sutures. Conclusion TB-RME and BB-RME would not seem to considerably affect the anatomy or the volume of the orbital cavity in adolescents.

Etiological Factors of the Midline Diastema in Children: A Systematic Review

“…Management of midline diastema includes observation and follow-up, orthodontic treatment, frenectomy, space closure, restorative treatment, and removal of the supernumerary tooth. 24 , 25 Clinical assessment of effective maxillary expansion may also result in midline diastema, 25 and this diastema is not considered true diastema. Hence, it is essential to have a history of the maxillary expansion in the child prior to diagnosis.…”

Comparison between Additive and Subtractive CAD-CAM Technique to Produce Orthognathic Surgical Splints: A Personalized Approach

“…In this regard, with the continuous advancements in 3D imaging, is it possible to comparatively estimate morphological and dimensional aspects of anatomic-based objects? In the present study, we used a precise technology involving the surface-to-surface matching technique [ 24 , 25 , 26 , 27 , 28 ] that allows the superimposition of 3D objects and the evaluation of point-to-point surface distances between the registered models. The analysis was enriched by the 3D color-coded map showing the morphological differences between the registered structures in a color-based scale by setting specific levels of tolerance.…”

External root resorption (ERR) and rapid maxillary expansion (RME) at post-retention stage: a comparison between tooth-borne and bone-borne RME

“…The present study is the continuation of previously published studies involving the comparative analysis of skeletal and dento-alveolar effects between TB and BB expanders. Data were retrieved from the same sample of adolescents diagnosed with transverse skeletal deficiency and underwent CBCT examinations before treatment and after 6 months of retention [14][15][16]. The study was approved by the Health Research Ethics Board of Alberta University-Canada (protocol number: 00075765).…”

“…Exclusion criteria: apical lesions and/ or root canal treatment of the upper first molars and the first and second premolars, presence of any already diagnosed oral or systemic disease, prescribed medication, previous orthodontic treatment, maxillofacial surgery, or facial trauma. Information about the characteristics of the RME appliances, clinical protocol, and CBCT acquisitions have been previously reported [14][15][16].…”