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At least 1,099 records · Page 61Linked to original sources
PubMed1983

Continuous monitoring of the position of the ferret mandibular canine tooth to enable comparisons with the continuously-growing rabbit incisor.

A variable capacitance displacement transducer, previously employed for continuously monitoring movements of the rabbit mandibular incisor, was modified for use with the ferret mandibular canine. Comparing this tooth of limited growth with the tooth of continuous growth, similarities were seen in the reactions to extrusive loads and the responses at death. For the tooth of limited growth, however, less creep was seen with extrusive loading and hexamethonium did not produce changes in tooth position.

Animals↗
PubMed1983

Effects of sympathetic nerve activity on changes in the position of the rabbit incisor tooth evoked by acute alterations in arterial blood pressure.

The influence of the sympathetic innervation of periodontal blood vessels on the responses of the upper incisor tooth to sudden changes in mean arterial pressure was studied in 15 anaesthetized rabbits. Changes in axial position of the tooth were measured by ultrasonic transit time technique. With intact sympathetic nerves, the tooth showed small, if any, intrusive movements in response to 6-42 mm Hg reductions in arterial pressure evoked by stimulation of the aortic baroreceptor nerve. When exposed to similar periods of hypovolaemic hypotension, the intrusions were, on an average, 1 micron larger (p less than 0.01). After bilateral sectioning of the cervical sympathetic nerves, tooth intrusions in response to both types of pressure reduction became more marked, as did the extrusive movements evoked by abrupt increases in aortic pressure (produced by inflation of intra-aortic balloon). After sympathectomy, a 19 +/- 6 mm Hg rise in pressure caused extrusions of 6 +/- 3 microns, or 2 microns more than before the sympathectomy (p less than 0.01). The results suggest that the activity in sympathetic nerves to periodontal blood vessels may be inhibited by central nervous mechanisms and that the sympathetic innervation of the periodontal vasculature serves to minimize changes in tooth position brought on by sudden alterations in arterial pressure.

Animals↗
PubMed1984

Short-term extrusion of isolated teeth of adult monkey (Macaca fascicularis).

By means of a variable capacitance device, the occlusal movements of 12 fully-developed teeth were recorded in 6 adult monkeys. Sustained extrusion was seen, with rhythmic pulsations due to the heart beat and to breathing. Extrusion varied from 10 to 138 micrometers over periods of 40-360 min, and became progressively slower with time. Because of the protracted nature of the extrusion, it is probable that these tooth movements were caused by forces generated in the periodontal ligament resulting from biochemical changes in the periodontium rather than by vascular alterations, and occurred as a result of the removal of intrusive loads from the opposing teeth.

Animals↗
PubMed1985

Macrophage chemotaxis in experimental tooth movement in the rat.

Extracts from tissue surrounding teeth being moved contained chemotactic activity for peritoneal exudate cells (PEC). The tissue was homogenized, extracted and diafiltered using a 100,000 mol. wt cut-off filter. The filtrate contained statistically-significant chemotactic activity, whereas the retentate did not. Further fractionation of the filtrate using an isoelectric focusing column produced a filtrate fraction in the pH range between 5.0 and 6.8 which was chemotactically active. This sample was analysed for purity and mol. wt using sodium dodecylsulphate polyacrylamide-gradient gel electrophoresis (SDS-PAGE). Gels of the active fraction stained with Coomassie blue showed two distinct bands with molecular weights of 69,000 and 60,000.

Animals↗
PubMed1988

Continuous monitoring of the movements of erupting and newly erupted teeth of limited growth (ferret mandibular canines) and their responses to hexamethonium.

The rates of these eruption-like movements were high and were consistent with reports that eruption is fastest at the time of emergence into the mouth. Once the tooth had attained its initial functional position, there was a significant reduction in the rates. Following administration of the hypotensive agent, hexamethonium, the emerging tooth showed a significant decrease in eruption rates. However, no change was observed for the tooth which had attained its initial functional position. These findings support the view that there are physiological differences at the eruptive and initial functional stages of eruption. The effects of hexamethonium on the erupting ferret canine differ from those reported for the erupting rabbit incisor. This may reflect differences in the eruptive processes for teeth of limited and continuous growth, although other evidence suggests similarities between these.

Animals↗
PubMed1991

Responses of calcitonin gene-related peptide-immunopositive nerve fibres in the periodontal ligament of rat molars to experimental tooth movement.

Nerve fibres showing CGRP-immunoreactivity were exclusively distributed around blood vessels in the periodontal ligament of normal teeth. The CGRP-positive nerves as well as the vessels were more dense during tooth movement and reached a maximum density and intensity of immunoreaction after 3 days. After that, the immunoreactive nerves gradually disappeared, and returned to the control level by the 7th day. Some of the CGRP-nerves were adjacent to bone resorptive lacunae at 3 days when active remodelling of alveolar bone was taking place. These findings suggest that the distribution of CGRP-positive nerves is dynamically changed around the blood vessels in the periodontal ligament during tooth movement, and that CGRP might affect the regulation of blood flow in the ligament. CGRP is possibly involved in the tissue remodelling, directly or indirectly, in addition to its function as a neurotransmitter.

Animals↗
PubMed1975

The indications for the transplantation of maxillary canines in the light of 100 cases.

One hundred cases of autogenous transplantation of maxillary canines are reviewed and the results assessed. They were divided into Group A, 50 cases 3 to 10 years out of retention, and Froup B, 50 consecutive cases 1 to 3 years out of retention. If the criteria for success depended on a normal response to vitality test, 62 per cent of Group A and 24 per cent of Group B were successful. If a prognosis rating was used, 68 per cent of Group A and 72 per cent of Group B had a good prognosis.

Alveolar Process↗