| Objective: The purpose of this study is to set up a series of data of the maxilla and maxillary sinus for the adults 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. Precise planning resulted in good success and decreased complications.Method:17 healthy adult volunteers(34 sides) were selected, and three-dimensional models to the maxilla were reconstructed on the basis of spiral volume scans. Collimation was 3 mm, Reconstruction interval was 1 mm. The slices vertical to the compensating curve were made in every dental position and collected the data of alveoli and maxillary sinus on the advantage workstation (AW 4. 0-3). Then the data were analyzed. The same works were done on both sides.Results: 1.All three-dimensional models of maxilla were constructed. 2. The normal data of maxila was got.. 3. There is no significant difference between the data of the left and right maxilla. 4. The alveolar ridge and the place of it up 10mm were more and more wider from mesial to distal except for lateral incisor. 5. The distance between the alveolar ridge of posterior teeth to the floor of maxillary sinus: the first molar is the nearest, then the second molar, the second bicuspid and the first bicuspid. There is no significant difference among the front there teeth .But it has significant difference with the first bicuspid. 6. The angle between the labial teeth long axis and alveoli long axis: There is no significant difference between maxillary canine and maxillary incisors. Conclusion: Different types of dental implant should be chosenaccording to the anatomic characteristic of the maxillary bone in every dental position before the operation to avoid complications. The data on the basis of spiral CT scans can lead to reliable, precise planning.Postgraduate Yanhui Wang(Oral & Maxillofacial Surgery) Directed by Ningyi Li...
|
PDF Full Text Request