Application of multislice helical computed tomography in maxillofacial distraction osteogenesis / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To develop the method and investigate the value of the application of multislice helical computed tomography (CT) in the maxillofacial distraction osteogenesis.</p><p><b>METHODS</b>Twelve cases of maxillofacial distraction osteogenesis (3 in zygoma, 2 in maxilla, and 7 in mandible) were scanned by the multislice helical CT, then the reconstruction of three dimensional and fault image and the relative measurement were carried out to study the effect of distraction and osteogenesis.</p><p><b>RESULTS</b>The three dimensional image provided clear and high resolution stereoscopic view that the effect of distraction osteogenesis could be evaluated easily and exactly. The fault image could be set up in private computer by Mimics and the measurements, such as distance, thickness and density, could be performed as expected. The effect of 12 cases was satisfied, and the average distracted distance was 16.73 mm.</p><p><b>CONCLUSION</b>Basing on multislice helical CT scanning, the high resolution image reconstruction and relative measurement data could be obtained which could meet the need of clear and direct observation. Its application in the maxillofacial distraction osteogenesis is expecting and promising.</p>

Segmental reconstruction of maxillary defects by arced distraction osteogenesis of zygoma / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To study the possibility of segmental maxillary regeneration by arced distraction osteogenesis of zygoma.</p><p><b>METHODS</b>The distraction of zygoma with the internal arced devices was performed in 2 dogs to simulate the reconstruction of maxillary defect. The zygoma was distracted about 12 mm, and the process of new bone formation was studied by histology and scanning electron microscopy.</p><p><b>RESULTS</b>The transport disk was distracted about 12 mm around the arc. After 8 weeks of consolidation, the density of new bone was close to that of normal bone.</p><p><b>CONCLUSIONS</b>The segmental maxillary regeneration by arced distraction osteogenesis of zygoma is possible.</p>

Applied anatomy study related to implants in the temporal bone region / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To study the bone anatomic structure of the temporal bone region and provide reference in implant surgery in this region.</p><p><b>METHODS</b>Manual quantitative measurements of the bone structure were performed in 73 skull specimens (38 from male and 35 from female).</p><p><b>RESULTS</b>In the area of 8:00-11:00 (right ear) and 16-22 mm from center of the external auditory canal in the temporal bone region, the minimum bone thickness is as follows: 11:00: 6.77 mm in male, 5.18 mm in female; 10:00: 8.60 mm in male, 6.77 mm in female; 9:00: 9.85 mm in male, 7.30 mm in female; 8:00: 14.50 mm in male, 10.80 mm in female.</p><p><b>CONCLUSION</b>(1) In the temporal bone region, the area of 8:00-11:00 (right ear) and 16-22 mm from center of the external auditory canal offers sufficient bone for implants. The length of implants should be as follows: 11:00: 4-5 mm in male, 3-4 mm in female; 10:00: 4-7 mm in male, 4-5 mm in female; 9:00: 4-8 mm in male, 4-6 mm in female; 8:00: 4-12 mm in male, 4-8 mm in female. (2) Towards the external auditory canal and from 12:00 to 11:00, 10:00 to 8:00, the bone became thicker, so, if no ample bone is available in the initial site, the location should be shifted anti-clockwise in right side (clockwise in left side) and closer to the external auditory canal. (3) The differences between male and female are statistically significant in the temporal bone region, so they should be treated distinguishingly during the clinical practices.</p>