The purpose of this study is to improve the availabilities of radiographic technics as dkgnostic methods to evaluate maxillary sinus in dental clinic.
For the morphologic study of maxillary sinus, 20 dry maxillas were used and intraoral gandard views, orthopantomograms, and skull P-A views were taken.
For measuring the vertical image magnification rates, 5 sites in maxillary molar regions 4 5 dry mandibles were selected randomly and 25 wires of the determined sizes for selected Ortions were attached to the sites, after then, intraoral radiograms with bisecting technic and orthopantomograms were taken.
The acquired results were as follows:
1. The anterior extension of the maxillary sinus on orthopantomogram was the distal side of the canine in 45.45% of subjects, the mesial side of the canine in 27.27%, the lateral incisor in 9.09%, the mesial side of the 1st premolar in 9.09%, and the mesial side of the 2nd premolar in 9.09%.
2. The positional relationship between the floor of maxillary sinus and the apex of alveolar socket revealed superimposed type in 58.3% of subjects, approached type in 33.3%, and separated type in 8.4%.
3. The morphology of inferior border of maxillary sinus was simple V or U shape in edentulous stage and V or wide U shape in alveolar socket stage.
4. The vertical image length on intraoral film taken by bisecting technic was magnified by 27.23% on the average and the length on orthopantomogram by 12.35%.
5. The inferior borders of maxillary sinus coinciding with each of the areas bearing the anterior and the posterior teeth on skull P A view were determined.
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