Extracted human teeth were used in a study to determine the affect of an apical resection on the elimination of accessory canals and apical ramifications. The apices of 60 roots were resected 2 to 3 mm, an undercut slot preparation was fashioned and retrofillings of Cavit, zinc oxide and eugenol, and amalgam were placed. The identical procedure was carried out on another group of roots, except the apices were slightly beveled to the labial without any significant resection.
The apical portion of all the roots were immersed to the midroot level in methylene blue dye and subsequently dried. An examination of the apical 5 mm of all the roots was made with a dissecting microscope at 20X to determine the number of accessory foramina present and the number of accessory canals penetrating to the internal surface of the tooth and to what point they penetrated.
The investigator reported that a 2 to 3 mm apical resection, prior to retrofilling, reduces the percentage of roots containing accessory canals penetrating coronal to the retrofilling from 12 percent to 0 percent. A decrease was also seen in dye penetration into the main root canal implying an increase in the effectiveness of the periapical seal.
Edwin B. Nutting
Ronald E. Buell
Raymond W. Dolph
Elmer E. Kelln
Master of Science (MS)
Year Degree Awarded
Date (Title Page)
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Loma Linda University Libraries
This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights.
Cummings, Raleigh R., "The Rationale of Apical Resection in Retrofilling Procedures" (1970). Loma Linda University Electronic Theses, Dissertations & Projects. 1575.
Loma Linda University Electronic Theses and Dissertations
Loma Linda University. Del E. Webb Memorial Library. University Archives