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A Radiologic Study of the Relationship of the Maxillary Sinus Floor and Apex of the Maxillary Molar

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Abstract

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#ÃÊ·Ï#
In this study, radiographic evaluation was made using panoramic radiography and
cross-sectional tomography of SCANORAR in male and female adults in
their 20's on the relationship between the maxillary sinus floor and the apex of the
maxillary molar, to test the accuracy and effectiveness of the cross-sectional
tomography, and to use this information in the assessment of preop. and postop. root
canal treatment, apical surgery, extraction and implantology.
Forty-one adults with an average age of 24.4 years were studied using panoramic
radiography and cross-sectional tomography. In panoramic view and cross-sectional
view, the position of the apices of maxillary molars were classified as separated,
contacted, or protruded type; the general shape of the maxillary sinus floor was
evaluated horizontally and vertically from cross-sectional tomography.
The accuracy of each radiography was tested using maxilla from 5 fresh cadavers
from the Anatomy Lab at Yonsei University Dental College, and panoramic view and
cross-sectional topography were taken in the same condition as with the patients.
The results were as follows :
1. Panoramic view and cross-sectional view were taken in the maxilla specimen, and
the actual distance between the maxillary sinus floor and the tooth apices were
measured in the specimen : the median values of the distance from the tooth apices to
the maxillary sinus floor in the panoramic view, cross-sectional view and in the actual
maxilla specimen were 2.83§®, 4.5§®, and 4.15§®, respectively. In the crosssectional view,
the measured distance was close to the actual distance but in the panoramic view, the
measured distance was far from the actual distance.
2. When the results of the panoramic view and cross-sectional view were compared,
40.5% of the results agreed with each other in the two radiographic
methods and buccal roots of the 2nd molar were the closest to the maxillary sinus
floor in the crosssectional tomography.
3. In cross-sectional view, when the vertical relationship of the maxillary sinus floor
and maxillary roots was assessed, in 1st molars, type ¥± (the sinus floor that extends
down to the buccolingual furcation area)was predominant. while in 2nd molars, type I
(the sinus floor located above the level connecting the buccal and lingual apices) was
predominant.
In the horizontal relationship, in 1st molars, type ¥±(the lowest floor of the maxillary
sinus located in between the buccal and lingual roots) was predominant, in 2nd molars,
type ¥° (the lowest floor of the maxillary sinus located on the buccal side of the buccal
roots) and type ¥± appeared in similar frequency.
In conclusion, the SCANORAR cross-sectional topography was more
effective than the frequently used panoramic view, in that the relationship of the
maxillary molars and maxillary sinus floor can be evaluated more accurately and the
buccolingual cross-sectional view can also be observed. And maxillary sinus floor that
was close to maxillary 2nd molar had tendency to be located on buccal side than that
close to 1st molar. Therefore, cross-sectional topography is an effective and accurate
method to evaluate the position of the teeth in relation to the sinus floor preoperative
and can be easily used to diagnose localized periapical lesions. Also, the image quality
obtained was quite satisfactory.

floor of the maxillary sinus; maxillary molar; panoramic radiography; SCANORAR cross-sectional tomography; relationship;

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