Biomedical subjects
Publications and source records attributed to R F Carr.
Fragments recovered from the burned wreckage of a gasoline truck and thought to be parts of teeth were confirmed as such after they were examined with a scanning electron microscope. The appearance of the fragments was compared with previously published descriptions of teeth which had been incinerated under laboratory conditions and also examined by scanning electron microscopy.
Sclerosing stromal tumor is an uncommon ovarian neoplasm that has only recently been defined and distinguished from fibrothecoma. This case report describes a 17-year-old patient who presented with a large sclerosing stromal tumor and a smaller mature teratoma in the left ovary. Eighteen months later, an immature teratoma was discovered in the contralateral ovary and microscopic spread outside the ovary was documented at staging laparotomy. Mature and immature teratomas have been observed in opposite ovaries in a small number of patients. However, sclerosing stromal tumor, in over 60 published cases, has not been associated with other forms of ovarian neoplasia. Gonadal stromal differentiation, in fact, has not been convincingly demonstrated in teratomas. The observations in this case, therefore, appear to be unique.
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In this study slightly more than two out of every 100 biopsy specimens from the set population of 10,414 specimens showed malignant oral lesions. The most common sites for oral malignancy were the floor of the mouth and the alveolar ridge, respectively. Lesions were most common during the fifth decade of life, followed by the sixth. Eighty-eight percent of the malignant lesions occurred in whites and 12% inn blacks. This does not deviate significantly from the percentage in the total biopsies reported. Of the categories of neoplasms, surface ectodermal neoplasms predominated, followed by salivary and mesenchymal lesions, respectively. There did not appear to be a significant difference in sex incidence.
Pan American Flight 759 crashed on takeoff from New Orleans International Airport on 9 July 1982. One-hundred-and-fifty-four persons lost their lives making this the second worst air crash in the United States. A dental identification team was assembled and began working the next morning. Ninety-three victims were positively identified by dental means and twenty-three other victims had strong supporting dental evidence as to their identities. The organization, method used, planning, and problem resolution concerning the dental team for this crash are presented.
An uncommon case of squamous cell carcinoma of the tongue in a young adult is presented. The lesion was physically related to a metallurgically flawed gold crown that was in place for 15 years. Detailed recording of findings and reporting of nontypical cases of oral cancer is suggested with a view to identification of etiologic factors.
A case of osteochondroma of the mandibular condyle has been presented, along with a review of the features of this lesion. A consideration of immediate condylar replacement after benign tumor surgery of the condyle is discussed.
A case of giant cell tumor of the mandible is presented, with treatment and follow-up for two and a half years. Although the lesion had characteristics of giant cell granuloma described by Jaffe, its aggressive clinical behavior influenced the diagnosis and treatment. Prosthetic rehabilitation was accomplished with a mandibular staple bone plate placed through a bone graft.
Fifteen beagle dogs seven to 15 months of age had 0.5 g of hydroxylapatite in the form of sharp-edged particles (HA-1) or rounded particles (HA-2) implanted in buccal soft tissue pouches. Tissue specimens from each site were obtained at two weeks, six weeks, three months, and six months. A mild inflammatory response was seen at the implant sites with both particle shapes; however, inflammation resolved at a faster rate in the sites implanted with round hydroxylapatite particles.
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THIS STUDY investigated the relationship between the degree of periodontal destruction present in advanced periodontal lesions and consistently associated infiltrates of lymphocytes and/or plasma cells. A total of 385 biopsy specimens were obtained from the depths of pockets during routine periodontal surgery. The selected lesions were in "established" or "advanced" stages and were classified according to pocket depth as Class I (4-6 mm) or Class II (7-10 mm). The infiltrates attached to the cementum, bone, or lining the pocket soft tissue wall were classified in five types according to the distribution of lymphocytes, plasmocytes, and neutrophils. Statistical evaluation of the findings demonstrates a strong, significant relationship (P less than 0.001) between the degree of destruction of supporting periodontal tissues (Class II) and the predominance of plasma cells in the infiltrate (Type a). A weaker significant correlation (P less than 0.02) was found between predominant lymphocytic populations (Type b) and Class I lesions. The assumption was made that local, specific, cellular infiltrates reflecting immunologic mechanisms are associated with the degree of periodontal destruction in humans.
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This case graphically illustrates the dental clinician's role in the diagnosis of Gardner's syndrome. Findings in the head and neck in this case led to discovery of the disease. Because of the high incidence of malignant transformation, surgery of the lower intestinal tract is done to remove any polypoid lesions. Normal-appearing tissue from which carcinoma might arise is also removed. Because of the usual occurrence of head and neck lesions in Gardner's syndrome, the clinician can make a major contribution in the diagnosis of this uncommon, but important, disease.
A rare instance of a primary clear cell renal carcinoma metastasizing to the left mandible has been presented. Metastatic tumors to the jaws are relatively uncommon and involve the mandible more frequently than the maxilla. When they occur, the primary tumor is most likely to be an adenocarcinoma from the breast, lung, or kidney. A pulsatile mandibular lesion, found not to be an arteriovenous fistula, suggests a metastatic renal carcinoma until it is disproved.
The 11th case of squamous odontogenic tumor is presented, along with a review of the literature concerning this lesion. Possible origin from gingival rests of Serres is postulated.
A foreign object, presumably swallowed during a dental appointment, was recovered by using an esophagoscope and thought to be a piece of dental impression material, probably alginate. It was identified as being of nondental origin by means of visible light and scanning electron microscopy (SEM), the latter coupled to an energy dispersive X-ray analyzer. Histologic examination revealed some amorphous crystalline material surrounded by parakeratin and exfoliated squamous cells. The material was essentially radiolucent. A known dental alginate impression material contained diatomaceous earth filler (siliceous shells of diatoms), but no microscopic symmetrical figures were seen in the foreign body. After dehydration, both materials were carbon-coated and observed in an SEM at 20 kV at magnifications up to 2000 X. The spectrum of secondary X-rays produced by the scanning electron beam revealed only magnesium in the foreign body and mostly silicon in the dental alginate. There are no known dental products that contain magnesium as the only inorganic ingredient and so the foreign body is believed to be not of dental origin. The patient may have had an antacid or laxative having magnesium as a major ingredient in the stomach, and this may have been refluxed from the stomach after stimulation of the normal gag reflex during the dental procedure.
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