A Scanning Electron Microscopic Investigation of Accessory Foramina on the Bifurcation area of Human Primary Molars (Part 2)
1993 Volume 31 Issue 3 Pages 496-509
Details
1993 Volume 31 Issue 3 Pages 496-509
The bifurcation area (external furcation area) of 39 primary first and second molars of 10 mandibulars of Indian sculls was investigated with a scanning electron microscope for the presence of accessory formaina. Accessory foramina were also studied with respect to size, form, location and frequency. The results were compared with our previous study of accessory foramina on the pulp chamber floor (internal furcation area).
The following conclusions were obtained.
1) The accessory foramina on the bifurcation area were observed in 9 mandibulars (90%) out of 10 and in 33 teeth (84.6%) out of 39 teeth. These values were higher than those values of the accessory foramina on the pulp chamber floor. There was a significant difference between the values of the two areas.
2) The maximum 20 and minimum one accessory foraina were found with an average of 5.5 per tooth on the bifurcation area. This average value was 2.8times of the value on the pulp chamber floor.
3) Accessory foramina were observed with high frequency in the central portion of the bifurcation area. It seemed to show the same tendency as that obtained on the pulp chamber floor.
4) The diameter of the opening of the accessory foramina on the bifurcation area of mandibular first primary molars was 76.1 μm on the average, while 96.1μm in the mandibular second primary molars. These averages values were higher than those average values on the pulp chamber floor. There were significant differences between the average values of the two areas.
5) The round shape accessory foramina was found most commonly on the bifurcation area in 95 cases (52.2%). This result was the same as that obtained on the pulp chamber floor.
6) Accessory foramina on the bifurcation area tended to be present bilaterally in the same individual. It seemed that there was an individual difference in the presence or absence of accessory foramen. This tendency was the same as our previous study of the accessory foramina on the pulp chamber floor.
