Peter J. Tsaknis

Effects of a warm gutta-percha technique on the lateral periodontium☆

The microanatomy of lateral periodontal tissues was examined after root canal obturation by a warm gutta-percha technique had been accomplished. Inflammatory responses were slight and of shot duration. The use of hot instruments for the condensation of the filling material did not appear to endanger the integrity of the lateral periodontium.

Light microscopy, scanning electron microscopy, and microprobe analysis of bone response to zinc and nonzinc amalgam implants

Freshly mixed, unset zinc-free and zinc-containing analgam was implanted in the right tibia of 32 rats. Half of the specimens were examined by the light microscope and the other half by the scanning electron microscope and x-ray microprobe analysis. It was found that amalgam is well tolerated by the rat osseous tissue, and there were no histologic reaction differences between zinc and zinc free amalgam. The surfaces of the implants were covered by an organic film at 3 weeks and with bone at later intervals. Very little corrosion products containing sulfur were observed on the amalgam surface at all intervals. Bone adjacent to the amalgam contained tin and sulfur irrespective of the presence of zinc in the alloy, indicating outward migration of specific components of the alloy.

The effects of partially filled polyethylene tube intraosseous implants in rats.

Polyethylene tubes obturated flush at one end and 1 mm. short at the opposite end with gutta percha and Grossmans cement as the cementing media were implanted in rat tibias. The gutta-percha, the set Grossmans cement, and the polyethylene implant were well tolerated by the rat intraosseous tissues. There was no significant inflammatory response at either the flush end or the short end of the polyethylene implant.

The Effects of Overfilled Polyethylene Tube Intraosseous Implants in Rats.

Polyethylene tubes obturated flush at one end overfilled 2 mm. at the opposite end with unset Grossmans cement and gutta-percha were implanted in rat tibias. Microscopic evaluation of the specimens revealed that (1) the gutta-percha, Grossmans sealer, and polyethylene tubing are well tolerated by rat intraosseous tissue and (2) a canal overextended 2 mm. beyond the apex with Grossmans cement and gutta-percha produces an early mild to moderate inflammatory response which resolves by the end of 30 days. The overfillings did not significantly compromise the healing of rat intraosseous tissue.

Clear-cell sarcoma of tendons and aponeuroses

The natural history and histologic characteristics of a rare malignant neoplasm of tendons and aponeuroses are described, and a case is presented which originated in the right foot of a 19-year-old Caucasian woman who succumbed to the disease after 4 years. This case represents the first known example of metastasis to the oral cavity of this particular neoplasm.

An evaluation of the rinse technique for oral cytologic diagnosis

Abstract The rinse-gargle technique was evaluated in twenty pretreatment patients with oral or pharyngeal carcinomas. Although adequate cell samples were obtained, the rinse-gargle technique was not found to be an accurate method for the diagnosis of oral pharyngeal carcinomas.