Anthropometric measurements were performed on the teeth, dental arch and mandible. Parameters for these three categories were compared by means of canonical analysis in order to understand the morphological relationships existing among them. The sagittally projected length of the mandible had a significant role in the correlation between the size of the teeth and the length of the dental arch, which had not previously been noted to date. The dental arch width was not significantly related to the size of the teeth. The lengths of the alveolar portion and the post-alveolar portion of the mandible were independent of each other. This fact might indicate that the reduction in the size of the mandible in human microevolution occurs mainly in the post-alveolar portion.
Jaw and orofacial motor areas of the cat cerebral cortex were determined by intracortical microstimulation (ICMS). These body parts were represented in two separate areas : one located in the anterior part of the coronal and lateral sigmoid gyri (area C), the other in the anterior part of the orbital gyrus (area O). Retrograde transport of HRP showed that areas C and O were reciprocally connected. The projection from area O to area C was found to be stronger than that existing in the opposite direction. Ablation of area C abolished the movements of the jaw and orofacial regions produced by ICMS of area O, while ablation of area O produced few changes in the patterns of movement in area C.
The effects of 5-hydroxytryptophan (5-HTP) and paroxetine on cortical extraneuronal 5-hydroxytryptamine (5-HT) in phenelzine-treated rats were studied using in vivo differential pulse voltammetry. Two injections of phenelzine (46.8 mg/kg 18 h and 11.7 mg/kg 90 min previously) reduced the indole oxidation current by approximately 20%, whereas a single injection (46.8 mg/kg 90 min previously) did not. Injections of 5-HTP, but not paroxetine, in phenelzine-treated rats caused an increase (71 %) in the indole oxidation current.
Sixty samples of extirpated pulp were studied to make a comparison of clinical and pathological diagnosis in order to understand the pathomorphological changes occurring in the pulp. All normal pulp samples, and those showing chronic hyperplastic pulpitis and pulp necrosis, were in accord with each respective diagnosis. Clinical diagnoses of C2 and C2 + hypersensitivity often revealed chronic pulpitis and degenerative pulp pathologically. It was thought that these conditions might suggest the existence of pulpal morphological change. Acute pulpitis and chronic ulcerative pulpitis were not consistent with each diagnosis in some cases because of extirpation of the true pulpal lesion. Calcification was identified in 60% of all cases.
A case of lymphoepithelial cyst occurring on the ventral surface of the tongue is presented, together with immunohistochemical findings of lymphoid cell immunoglobulins. The results obtained showed that the predominant immunoglobulin-producing cell was IgG isotype, followed by IgA and IgM. The genesis of the cyst was also discussed.
A relatively rare case of venous hemangioma in the buccinator muscle with phleboliths in a 41-year-old woman is reported. The hemangioma was studied using immunohistochemical techniques such as the PAP method with factor VIII-related antigen and the ABC method with seven kinds of lectins, and the endothelial cells of this tumor demonstrated the existence of factor VIII-related antigen, L-fucose and N-acetyl-D-galactosamine. By scanning electron microscopy, the inner surfaces of the involved blood vessels appeared irregular in their sizes, shapes and arrangement in comparison with those of normal blood vessels. The cut surfaces of the phleboliths revealed a lamellar structure. Aggregations of microcrystals corresponding to apatite were found on the surface and inside the phleboliths by SEM. The x-ray micro-diffraction pattern of the phleboliths indicated immature hydroxyapatite crystals. The genesis of the phleboliths was discussed.
The authors have conducted a series of basic studies on the clinical application of visible light-curing denture base resin manufactured by Dentsply Co. The results obtained confirmed that the fundamental physical properties of this resin almost matched those of heat-curing resin. Dentsply has recently marketed a relining material of this type, which has a viscosity coefficient a little lower than that of Dentsply-made denture base resin. We consider that further efforts should be made to lower the coefficient of viscosity if the material is to have better usability and relining maneuverability. Also, this resin has drawbacks such as bitterness or an amine-like smell before curing. The authors therefore tried to make a relining material free from these faults, using cyclophosphazene monomer (4 PN- (TF) 2- (EMA) 6). In this trial, it was shown to be possible to make a relining material well suited for clinical use, being tasteless and odorless with a lower viscosity coefficient and greater liquidity.