Scientific Publications on CBCT - June 2010

New Bone Formation in the Maxillary Sinus Using Only Absorbable Gelatin Sponge.

Sohn D.-S., Moon J.-W., Moon K.-N., Cho S.-C., Kang P.-S.

Journal of Oral and Maxillofacial Surgery. 68(6)(pp 1327-1333), 2010. Date of Publication: June 2010.

AB Purpose: The purpose of the present study was to evaluate the predictability of new bone formation in the maxillary sinus using only absorbable gelatin as the graft material. Patients and Methods: Seven patients (9 sinus augmentations) were consecutively treated with sinus floor elevation by the lateral window approach. The lateral bony window was created using a piezoelectric device and the schneiderian membrane was elevated to make a new compartment. After 18 resorbable blast media surfaced dental implants were simultaneously placed, absorbable gelatin sponges were loosely inserted to support the sinus membrane over the implant apex and the bony portion of lateral window was repositioned to seal the lateral window. Results: After uncovering the implants an average of 6 months after placement, new bone consolidation in the maxillary sinus was observed on radiographs without bone graft. Two implants were removed due to failed osseointegration on uncovering. Failures were caused by insufficient initial stability. Conclusion: This study suggests that placement of a dental implant in the maxillary sinus with a gelatin sponge can be a predictable procedure for sinus augmentation. copyright 2010 American Association of Oral and Maxillofacial Surgeons.

Automatic extraction of mandibular nerve and bone from cone-beam CT data..

Kainmueller D., Lamecker H., Seim H., Zinser M., Zachow S.

Medical image computing and computer-assisted intervention : MICCAI ... International Conference on Medical Image Computing and Computer-Assisted Intervention. 12(Pt 2)(pp 76-83), 2009. Date of Publication: 2009.

AB The exact localization of the mandibular nerve with respect to the bone is important for applications in dental implantology and maxillofacial surgery. Cone beam computed tomography (CBCT), often also called digital volume tomography (DVT), is increasingly utilized in maxillofacial or dental imaging. Compared to conventional CT, however, soft tissue discrimination is worse due to a reduced dose. Thus, small structures like the alveolar nerves are even harder recognizable within the image data. We show that it is nonetheless possible to accurately reconstruct the 3D bone surface and the course of the nerve in a fully automatic fashion, with a method that is based on a combined statistical shape model of the nerve and the bone and a Dijkstra-based optimization procedure. Our method has been validated on 106 clinical datasets: the average reconstruction error for the bone is 0.5 +/- 0.1 mm, and the nerve can be detected with an average error of 1.0 +/- 0.6 mm.

Evaluation of Root and Canal Systems of Mandibular First Molars in Taiwanese Individuals Using Cone-beam Computed Tomography.

Huang C.-C., Chang Y.-C., Chuang M.-C., Lai T.-M., Lai J.-Y., Lee B.-S., Lin C.-P.

Journal of the Formosan Medical Association. 109(4)(pp 303-308), 2010. Date of Publication: April 2010.

AB Background/Purpose: Cone-beam computed tomography (CBCT) can provide valuable data for root canal systems of human teeth. This study used CBCT to evaluate the number of roots and canals in mandibular first molars in Taiwanese individuals. Methods: We screened 151 patients (76 male and 75 female) scheduled for CBCT scan prior to implantation, or orthodontic, endodontic, or periodontic treatment between June 2006 and March 2009 at the Department of Dentistry, Cardinal Tien Hospital, Taipei, Taiwan. A total of 237 image samples of mandibular first molars were obtained and analyzed for their number of roots and canals. Results: We found that 177 (74.7%) mandibular first molars had two roots and 60 (25.3%) had three roots. Of the 237 teeth, 133 (56.1%) had three canals, 96 (40.5%) had four, and eight (3.4%) had two canals. Of the 86 patients (43 male and 43 female) with bilateral mandibular first molars, 22 (25.6%, 15 male and 7 female) had bilateral three-rooted mandibular first molars, and six (7.0%, 4 male and 2 female) had unilateral three-rooted mandibular first molars. The chi2 test showed a significantly higher incidence of three-rooted mandibular first molars in male (44.2%, 19/43) than in female (20.9%, 9/43, p = 0.038) subjects. Conclusion: Our results showed a high overall incidence (32.6%) of three-rooted mandibular first molars in Taiwanese individuals. CBCT could be a valuable tool for identifying an extra distolingual root in mandibular first molars. copyright 2010 Formosan Medical Association & Elsevier.

Virtual occlusion in planning orthognathic surgical procedures.

Nadjmi N., Mollemans W., Daelemans A., Van Hemelen G., Schutyser F., Berge S.

International Journal of Oral and Maxillofacial Surgery. 39(5)(pp 457-462), 2010. Date of Publication: May 2010.

AB Accurate preoperative planning is mandatory for orthognathic surgery. One of the most important aims of this planning process is obtaining good postoperative dental occlusion. Recently, 3D image-based planning systems have been introduced that enable a surgeon to define different osteotomy planes preoperatively and to assess the result of moving different bone fragments in a 3D virtual environment, even for soft tissue simulation of the face. Although the use of these systems is becoming more accepted in orthognathic surgery, few solutions have been proposed for determining optimal occlusion in the 3D planning process. In this study, a 3D virtual occlusion tool is presented that calculates a realistic interaction between upper and lower dentitions. It enables the surgeon to obtain an optimal and physically possible occlusion easily. A validation study, including 11 patient data sets, demonstrates that the differences between manually and virtually defined occlusions are small, therefore the presented system can be used in clinical practice. copyright 2010 International Association of Oral and Maxillofacial Surgeons.

Temporomandibular Joint Condylar Abnormality: Evaluation, Treatment Planning, and Surgical Approach.

Venturin J.S., Shintaku W.H., Shigeta Y., Ogawa T., Le B., Clark G.T.

Journal of Oral and Maxillofacial Surgery. 68(5)(pp 1189-1196), 2010. Date of Publication: May 2010.