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Biomedical subjects

J K Avery

Publications and source records attributed to J K Avery.

6 recordsLinked to original sources
PubMed1979

Histopathologic and bacterial evaluation of conventional and new copper amalgams.

In vivo pulpal responses in monkeys and in vitro bacterial inhibition studies were completed on new copper amalgams, Sybraloy, Dispersalloy, Tytin and a conventional Spheraloy amalgam. Amalgams were placed in cavities lined with ZOE and in unlined cavities. Silicate and ZOE were used as controls. A total of 165 adult monkey teeth were evaluated at 3 days, 5 and 8 weeks. At 3 days the pulpal responses elicited by the copper amalgams appeared similar to conventional Spheraloy, all showing a slight to moderate response. At 5 weeks the majority of amalgams exhibited a slight pulpar response with a tubular reparative dentin under each restoration. The 8 week pulpal response showed a reduction of the inflammatory response characterized by a tubular reparative dentin with a uniform zone of predentin. Lined ZOE controls exhibited a slight response while silicate showed a moderate response with some persistent chronic inflammation. In vitro bacterial tests revealed that the various amalgams had little to no inhibitory effect on the three serotypes of S. mutans that are most prominent in humans.

Animals↗
PubMed1979

Light and ultrastructural relationship between oxytalan fibers in the periodontal ligament of the guinea pig.

The interfaces and the relationships between collagen and oxytalan fibers were observed under light and electron microscopy. Guinea pig periodontal ligament was prepared for light and electron microscopy with perfusion using Peter's buffered formalin for light microscopy and GTA-S-collidine and OSO4 for electron microscopic studies. The tissue for light microscopy was stained with a modified Gomori's aldehyde fuchsin technique, in which pre-oxidization with potassium monopersulfate was carried out before staining so as to demonstrate the oxytalan fibers. EM tissues were routinely stained with lead citrate and uranyl acetate. Two different structural relationships were observed. First, the subcomponents of the collagen and oxytalan fiber types interweave with each other; and, second, some of these two-fiber subcomponents appear attached to each other. These relationships and the known orientation of oxytalan fibers as seen in the periodontal ligament provide insight as to the function of oxytalan fibers. The oxytalan fibers may provide increased structural integrity and increased distribution of forces over a wider area of the periodontal ligament. Because of their close relationship to blood and lymph vessels in the periodontal ligament, they may also help to stabilize these elements by the same structural relationships to collagen fibers.

Animals↗
PubMed1977

The histological effects of composite resin materials on the pulps of monkey teeth.

Pulpal response of three bis glycol methacrylate composite resins, Smile, Simulate and Experimental Composite no. 2 were tested on primary and permanent monkey teeth using zinc oxide eugenol (ZOE) and silicate as controls. All materials were placed in Class V cavity preparations in Rhesus monkey teeth and evaluated at 3 days and 5 and 8 weeks. The materials were randomly placed in anterior and posterior teeth utilizing 75 primary and 75 permanent teeth. Following perfusion the teeth were prepared by routine histological procedures. The 3 day response of the composite resins was moderate, characterized by disruption of the odontoblasts, vacuolization and mild inflammatory response underlying the cavity. At 5 weeks the formation of reparative dentin and a decrease in the inflammatory response was similar for all resins observed. At 8 weeks a slight increase in reparative dentin and continued decrease in inflammation was noted when compared to the 5 weeks responses. At all time intervals ZOE produced the least pulpal response while silicate produced the most severe response.

Animals↗
PubMed1977

Histopathologic evaluation of three ultraviolet-activated composite resins on monkey pulps.

The pulpal responses of three ultraviolet-activated composite resins, Nuva-Fil, Experimental UV No. 1 and Experimental UV No. 2, were tested on adult monkey teeth using silicate and zinc oxide eugenol (ZOE) as positive and negative controls. All materials were placed in Class V cavity preparations in Rhesus monkey teeth using approximately 48 anterior and 63 posterior teeth of both the maxillary and mandibular arches. A total of 111 teeth were utilized and all materials were evaluated at 3 days, 5 and 8 weeks. Following left ventricular perfusion, the teeth were prepared for microscopic evaluation using routine histological procedures. The 3-day pulpal response of all the ultraviolet-activated composites was slight with some disruption and vacuolization in the odontoblastic layer and a slight inflammatory response. At 5 weeks there was a reduction of the inflammatory response and the formation of reparative dentin was noted for all ultraviolet composites. The 8-week pulp response was slight, characterized by a minimal inflammatory response adjacent to the zone of reparative dentin. Generally, ZOE produced the mildest response while silicate produced the most severe response at the three time intervals.

Animals↗
PubMed1977

Prenatal mandibulofacial dysostosis (Treacher Collins syndrome).

The clinical, radiographic, and histologic aspects of Mandibulofacial Dysostosis (Treacher Collins Syndrome)--MFD--are described as observed in a human fetus of approximately 15 weeks gestation age. Findings in the present study do not differ significantly from those previously reported, as the abnormal fetus exhibited the peculiar ocular, otic, and mandibular defects common in descriptions of postnatal survivors. Although exhibiting the major signs and symptoms of MFD even at this early developmental stage, previously unreported relationships dealing with the ossification of the mandible and salivary gland hyperplasia are noted. Contrary to expectation, vascularization appears excessive. The pathogenesis of the events leading to the deformities of the first and second branchial arches is extrapolated to seven weeks in utero.

Arteries↗