Three-Dimensional Cephalometric Analysis of Skeletal and Dental Effects in Patients Undergoing Transpalatal Distraction

Applied Sciences

Jowita Halupczok-Żyła¹  Beata Kawala²  Rafał Nowak³  Maciej Kawala⁴  Tomasz Żyła⁵ 

[1] Department of Endocrinology, Diabetes and Isotope Therapy, Wroclaw Medical University, 50-367 Wrocław, Poland;Department of Maxillofacial Orthopaedics and Orthodontics, Wroclaw Medical University, 50-425 Wrocław, Poland;Department of Otolaryngology and Maxillofacial Surgery, University of Zielona Góra, 65-046 Zielona Góra, Poland;Department of Prosthetic Dentistry, Wroclaw Medical University, 50-425 Wrocław, Poland;Private Orthodontic Practice, 55-200 Oława, Poland;

关键词: transpalatal distraction;    surgically assisted rapid maxillary expansion;    3D cephalometry;   

DOI  :  10.3390/app12094273

来源: DOAJ

【 摘 要 】

The present study aimed to assess dental and skeletal effects after transpalatal distraction using 3D cephalometry methodology. The study group comprised 34 patients (mean age 27.7 years) who were diagnosed with transverse skeletal maxillary deficiency of at least 7 mm. Computed tomography scans were obtained before surgical procedure (T1), after completion of expansion (T2) and at 6-month follow-up (T3). Computed tomography scans were imported into Dolphin Imaging software version 11.7 (Chatsworth, CA, USA). Three-dimensional skull models were oriented according to the Frankfurt horizontal plane, midsagittal plane (passing through the skeletal nasion) and frontal plane (passing through the right and left porion). Cephalometric landmarks related to skeletal, and dental structures were traced and linear and angular measurements were calculated. Following transpalatal distraction N-ANS and S-PNS distances increased by 1.27 mm and 0.54 mm, respectively. Skeletal expansion at the canine region (ARCR-ARCL) was 8.43 mm at T2 and 6.39 mm at T3. Expansion at the distal part of the maxilla (ARMR-ARML) was 5.95 mm at T2 and 4.81 mm after retention. The highest increase in maxillary arch width at T2 was observed at canines (8.74 mm), lower at premolars (8.33 mm) and the lowest at molars (6.76 mm). There is no anteroposterior movement of maxilla following transpalatal distraction; however, the maxilla shifts downward which is particularly marked anteriorly. Skeletal and dental expansion in the transversal plane occurs in a V-shaped manner, with more expansion at the anterior part of the maxilla.

【 授权许可】

Unknown