Cone-Beam Computed Tomography Analysis of Mental and Genial Spinal Foramina in a Thai Population

Objective: To investigate frequency, anatomic location, and morphology of mental and genial spinal foramina in a group of Thai population. Materials and Methods: A total of 107 maxillofacial cone-beam computed tomography scans were collected and analyzed for frequency, anatomic location and morphology of mental and genial spinal foramina. Data were analyzed using Chi-Square test, one-way ANOVA and independent t-test. P values less than 0.05 were accepted as statistically significant. Results: The mental foramen was located at the apex of second premolar in 46%and between apices of premolars 35.8%. Round and oval mental foramina were found in 65% and 21% of patients, respectively. The superior and inferior genial spinal foramina were encountered in 80.3% and 32.7% of patients, respectively. The accessory mental foramen was identified in 6.6% of patients. The average distance from the center of mental foramen to the alveolar and basal borders of mandibular body was 11.70 ± 2.13 and 16.34 ± 3.79mm, respectively. Conclusion: This study indicates that horizontal position of mental foramen in Thai population is remarkably variable. Cone beam computerized tomography is optimal for delineating diminutive anatomical structures in the anterior mandible. High prevalence rates of superior and inferior genial spinal foramina necessitate comprehensive CBCT screening before surgery in the interforaminal region of the mandible.published_or_final_versio

3D vs. 2D cephalometric analysis comparisons with repeated measurements from 20 Thai males and 20 Thai females

This paper presented 3D cephalometric analysis on DICOM data from I-CAT CT cone-beam machine consisted of averages and standard deviations from 20 Thai males from 19 to 70 year (average 33.53 ± 14.08 year) and 20 Thai females from 16 to 70 year (average 32.60 ± 15.37 year). The angular measurements consisted of 49 lateral angular measurements and 9 frontal angular measurements while linear measurements consisted of 29 lateral linear measurements, 3 frontal linear measurements, and 8 perpendicular measurements. Results in 3D were compared with the corresponding 2D results showing that most midline-to-midline linear measurements and some midline-to-midline angular measurements were not different, while other types of measurements were significantly different. The 3D results will be used in the clinical Ceph3D services as requested by those with interests on cephalometric analysis and anthropology with focus on Thai subjects while the 2D results will be used for comparison with cephalometric analyses from other orthodontists.ts reserved

International Journal of Dentistry and Oral Science (IJDOS)

Objective: To investigate frequency, anatomic location, and morphology of mental and genial spinal foramina in a group of Thai population. Materials and Methods: A total of 107 maxillofacial cone-beam computed tomography scans were collected and analyzed for frequency, anatomic location and morphology of mental and genial spinal foramina. Data were analyzed using Chi-Square test, one-way ANOVA and independent t-test. P values less than 0.05 were accepted as statistically significant. Results: The mental foramen was located at the apex of second premolar in 46% and between apices of premolars 35.8%. Round and oval mental foramina were found in 65% and 21% of patients, respectively. The superior and inferior genial spinal foramina were encountered in 80.3% and 32.7% of patients, respectively. The accessory mental foramen was identified in 6.6% of patients. The average distance from the center of mental foramen to the alveolar and basal borders of mandibular body was 11.70 ± 2.13 and 16.34 ± 3.79mm, respectively. Conclusion: This study indicates that horizontal position of mental foramen in Thai population is remarkably variable. Cone beam computerized tomography is optimal for delineating diminutive anatomical structures in the anterior mandible. High prevalence rates of superior and inferior genial spinal foramina necessitate comprehensive CBCT screening before surgery in the interforaminal region of the mandible

Hybrid fixation in the bilateral sagittal split osteotomy for lower jaw advancement

Miniplate and screw fixation has been widely used in bilateral sagittal split osteotomy, but some issues remain unclear concerning its lack of rigidity when compared to Spiessl's bicortical technique. This paper demonstrates the hybrid fixation technique in a case report. A 34-year-old female patient underwent a double jaw surgery with counter-clockwise rotation of the mandible fixed using the hybrid fixation technique. The patient evolved well in the postoperative period and is still under follow up after 14 months, reporting satisfaction with the results and no significant deviation from the treatment plan up to now. No damage to tooth roots was done, maxillomandibular range of motion was within normality and regression of the inferior alveolar nerve paresthesia was observed bilaterally. The hybrid mandibular fixation is clearly visible in the panoramic and cephalometric control radiographs. It seems that the hybrid fixation can sum the advantages of both monocortical and bicortical techniques in lower jaw advancement, increasing fixation stability without significant damage to the mandibular articulation and the inferior alveolar nerve. A statistical investigation seems necessary to prove its efficacy