A Study Of Three-dimensional Reconstruction And Measurement Of Edentulous Jaws

Objective: To study the intramandibular course of the mandibular canal in the edentulous jaw and its clinical significance on the basis of three-dimensional reconstruction and measurement by spiral CT scans. The data can provide an objective basis for an exact preoperative layout and the selection of dental implants for the edentulous jaw patients.Method: 24 edentulous jaw volunteers (48 sides) were selected and three-dimensional models to the edentulous jaws were reconstructed on the basis of spiral volume scans. Collimation and reconstruction interval was 1mm..The slices vertical to the compensating curve were made in mental Forman and the point 5mm,10mm,15mm,20mm behind mental Forman .Position and collected the data of the mandible and mandible canal on the mimics8.1.Then the data were analyzed. The same were done on both sides.Results: 1.All three-dimensional models of edentulous jaws were constructed.2.The data of edentulous jaws was got.3.The wideness of the alveoli increased from mesial to distal position. It was the same of the alveoli from the top to the bottom. The mandibular canal lied in the inner side of the mandibular body.4.The distance between the mandibular canal and the cranial and caudal borders of the body of the mandible partly changes to a statistically highly-significant extent, the distance between the canal and the atrophic alveolar ridge being affected more strongly than between the canal and the base of the mandible. These changes were most clearly pronounced in the point 10mm behind mental forman.Conclusion: Different types of dental implant should be chosen according to the anatomic characteristics of the edentulous jaws before the operation to avoided complications. The data on the basis of spiral CT scans can lead to reliable, precise planning.