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Biomedical subjects

D M Mazzocco

Publications and source records attributed to D M Mazzocco.

4 recordsLinked to original sources
PubMed1978

Quantitation of retention of endosseous dental blade implants in dogs.

This research was initiated in order to study the extraction forces associated with solid, single-vented and multi-vented blade dental implants placed in mandibles of dog for 2 months. An extraction device was used to measure the extraction forces on five of the implants and a histological study was carried out around the sixth multi-vented implant. The main finding was that the extraction forces for the multi-vented blade implants were 6 to 12 times those of the single-vented and solid blades. Other findings in this study were: none of the implants exhibited mobility; sulci ranged from 2 to 3 mm at the implant neck; bone covered the implant shoulder. There was gross and histologic evidence of bone growth in the vents of the multi-vented blade; close adaptation of the bone, connective tissue capsule and implant; and no gross, histologic, clinical or radiographic evidence of bone pathology.

Animals↗
PubMedDate not supplied

Quasimonochromatic radiation for dental radiography.

Because of the greater sensitivity of commonly used dental films near 40 kv and the inherently greater contrast between bone and other oral tissues that is achieved at lower energies than those conventionally used, a considerable reduction of radiation exposure can be obtained by the use of those quasimonochromatic photons whose energy lies between 30 and 40 kv. The simplest and clinically most efficacious and econimical method of obtaining this quasimonochromatic radiation using fixed-anode tubes involves the use of Ce, 0.008 inch in thickness, as a band-pass filter, with reduction of skin exposure by a third to a half. The considerable dose reduction achieved at an increased exposure time of only 1.2 seconds is significant in view of the fact that both a greater percentage as well as a greater number of people are receiving radiation for oral diagnosis every year. Since the quasimonochromatic rays produced are less energetic than much of the radiation in the unfiltered beam, the radiation doses from scattered radiation to skull, bone marrow, and gonads also are reduced. In addition, the softer photons result in less Compton scattering, reducing the fog and improving the diagnostic quality of the film. Quasimonochromatic radiation may also be used to enhance the contrast wherever iodine contrast medium is needed since iodine absorbs very strongly above its absorption edge near 33 kev, suggesting another use of this technique in the area of oral diagnosis.

Filtration↗