A Study for Dental Implantation Canal Localization before Surgery by Multislice Spiral Computer Tomography.
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Objective To investigate clinical application of post-image process with multislico spiral computed tomography
(MSCT) in localization of the dental implantation canal. Methods The distance and angles in the imaging guide with three ra-
diopaque indicators were measured and analysed in the models and images at each implant site with the indicatore and were achie-
ved by Multislice Spiral Computer Tomography(MSCT). Results The findings show no statistically significance between imaging
and physical measurements. Conclusion MSCT imagings can evaluate the effect of the residual bone and can accurately lacalize
the dental implantation canal.Keywords:
Spiral computed tomography
Multislice
Multislice computed tomography
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Objective To evaluate the shape and texture of the alveolar bones before dental implantation using three-dimension reconstruction techniques by multi-slice spiral CT ( MSCT). Methods Seventeen patients,whose alveolar condition was not clear enough to receive dental implantation,were screened out using conventional dental periapical and panoramic X-ray examination. The occlusion cast was made and a radiological guide template with titanium tube was prepared in the implantation area. The mandibular and maxillary bone was scanned with MSCT. The height,width and density of the alveolar were measured through three-dimensional reconstruction,so as to determine whether the alveolar was suitable for dental implant surgery. Implantation using ITI dental implant system was performed in patients whose alveolar condition met the implantation criteria. Results Pre-operation MSCT examination indicated that two cases were not suitable for the surgery due to a width of alveolar bone less than 5. 3 mm and a height of the residual bone under the maxillary sinus less than 3 mm. Fifteen patients suitable for the surgery underwent successful implantation. Conclusion The three-dimensional reconstruction of MSCT images of the jaws can provide more comprehensive and reliable information of the non-security areas and mandibular or maxillofacial alveolar bone defects before implantation.
Alveolar ridge
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OBJECTIVES To validate measurement accuracy in proximity to the incisive canal from two-dimensional (2D) reformatted spiral computed tomography (CT). MATERIALS AND METHODS Eight cadaver heads were examined with spiral CT with 1 mm thick axial slices and 1 mm.s-1 table feed. The data was transferred to a networked computer workstation to generate 2D orthoradially reformatted images. The length of the incisive canal and width of the alveolar crest were measured independently by two oral and maxillofacial radiologists. The soft tissues in the region of the incisive foramen were removed and physical measurements made using an electromagnetic digitizer. RESULTS There was no statistically significant difference between measurements on orthoradial 2DCT images and physical measurements (P > 0.05). CONCLUSIONS Accurate measurements for dental implant placement in proximity to the incisive canal can be made from reformatted spiral CT images.
Spiral computed tomography
Anterior maxilla
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Preoperative evaluation for the dental implanting normally starts with a thorough physical examination of the oral cavity and dental arches to determine the potential sites for the implant placement. Spiral dental CT plays a very important role in preoperative evaluation and postoperative follow up. It provides both 2 and 3-dimensional images, showing soft tissues and alveolar bone in each area, and it can be used to select the sites of implantation and to evaluate the angulations, the density and the contour of the alveolar bone, as well as the width and depth of the edentulous ridge.
Alveolar ridge
Dental arch
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Objective:To evaluate multislice spiral CT(MSCT) and curved reconstruction(CR) in the diagnosis of maxillary disease.Methods:24 cases were performed thin slice (1.25mm/i) MSCT scanning from the temporomandibular joint to the mandible.All source axial images were reconstructed into the curved tomogram images parallel to the maxillary arch and the lateral tomogram images perpendicular to the maxillary arch by means of CR software (Panorex display).Results:12 cases of maxillary fracture were well demonstrated the location and types of fracture,the relationship of the fracture with the maxillary sinus,alveolar bone,and the dislocation of the temporomandibular joint.The location,size of the lesion and its invasion to the maxillary sinus and alveolar bone were well demonstrated in cases of dentigerous cyst,dental caries,periapical abscess etc.Conclusion:MSCT can reduce the motion artifacts and improve the image quality.CR image could clearly show the panorama of maxillary disease,and the relations of each tooth with alveolar bone,maxillary sinus,bottom of nasal cavity etc.as well as the measurement of lesions.MSCT and CR are much helpful for the dental treatment, operation and plantation.
Mandible (arthropod mouthpart)
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Objective To evaluate the value of spiral CT in preoperative assessment in patients for dental implantation.Methods Jaws of 25 patients for dental implantation were scanned by spiral CT,including the location of template in 5-patients.Multiplanar reconstruction (MPR) of data after scanning was made.Results The density、shape、width、 height and defect of the local alveolar were demonstrated in the images in MPR. It's convenient to assess and plan the embedding operation.Conclusion Spiral CT was a effective aid in preoperative assessment of dental implantation.
Spiral computed tomography
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Spiral computed tomography
Mandibular canal
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Objective:To investigate the application of MSCT in preoperative assessment of panoramic structures of jaw for dental implantation by lamella scans technique.Methods:MSCT with dentascan software had generated multiplanar reconstructions on coronal, sagittal and axial sections. The lamella scans technique included 1.25mm slice continuous scanning and the location of template beforehand. These techniques could demonstrate jaw shape, structure and bone quality, integration of dental implant with bone, and relation of dental implant with important structures in jaw. Results:Dentascan software and the three dimensional techniques can clearly display the appearance and internal important constructions of jaw in implantation area, and measure the height and width of the jaws. Conclusion:MSCT scan designs can provide important informations for the dentists who will operate dental implantation.
Lamella (surface anatomy)
Jaw bone
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Objective Two multiplanar reconstruction (MPR) techniques of spiral CT were applied to examine the jaws, and their clinical effects of these CT images were evaluated in dental implantation. Methods Spiral CT scans to jaws of dental implantation cases were made. The scan data were processed by two software: dental multiple area MPR software and routine single area MPR software. Results Multiple area MPR can at the same time show several jaw panoramas and tens of cross section images of whole jaw arch,which can be separated at any intervals. Single area MPR can at the same time show any section image and any curve section images of single portion of jaws. Conclusions Two MPR images can be applied to examine jaws for preoperative designs of dental implantation, and to examine postoperative implant in jaws. Combined application of these two techniques can investigate jaw shape, structure and bone quality, integration of dental implant with bone, and relation of dental implant with important structures in jaw.
Jaw bone
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