A RETROSPECTIVE COMPARATIVE CROSS-SECTIONAL CBCT STUDY OF THE MAXILLARY SINUS DIMENSIONS AND PNEUMATIZATION IN ADULTS WITH CLASS II SKELETAL ANTERIOR OPEN BITE
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Objectives: To assess maxillary sinus dimensions and pneumatization in adults presenting with skeletal Class II malocclusion with anterior open bite (AOB) compared to those with skeletal Class II and Class I malocclusions without AOB. Materials and Methods: This retrospective cross-sectional cone beam computed tomography (CBCT) study was conducted on 43 adults (Class II AOB group= 11; Class II controls=16; and Class I controls= 16). Subjects were obtained from one private practice in Rochester, NY. The inclusion criteria was adult (ages 18 and above) females and males with good overall health condition, and full permanent dentitions (excluding third molars). Skeletal Class II malocclusion defined as having ANB angle of 3.2 or more, hyperdivergent growth pattern with mandibular plane angle (sella–nasion line to mandibular plane angle [SN-MP]) greater than 38 Dentoalveolar AOB greater than 1 mm, measured from canine to canine. No history of Orthodontic treatment, and Presence of pre-treatment CBCT records of adequate quality, showing a complete maxillary sinus, including the osteomeatal complex and entire maxillary floor. Dolphin imaging software was used to measure maxillary sinus craniocaudal, anteroposterior, and mediolateral heights, alveolar and basal bone heights, and 3D volume. All maxillary sinus dimensions and volume were compared between the three groups using One way ANOVA followed by Tukey Honestly Significant Difference (HSD). Results: The mean age of the sample was 41.2 13. The AOB group exhibited a significantly greater maxillary posterior alveolar bone height (P <0.05) compared to the control groups. The basal bone height in the region between the first molar and the second premolar was significantly greater in the AOB group than in the two control groups (P <0.05). There were no statically significant differences among the groups in the craniocaudal height, anteroposterior, and mediolateral dimensions and volume of maxillary sinus. Conclusion: There were statistically significant differences among the groups in the basal bone height in the region between first molar and second premolar, where AOB group showed higher means compared to the control groups. There were no statically significant differences among the groups in the craniocaudal height, anteroposterior, and mediolateral dimensions and volume of maxillary sinus. Key words: Maxillary sinus; cone-beam computed tomography; anterior open bite; skeletal Class II malocclusion.