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Biomedical subjects

H Trowbridge

Publications and source records attributed to H Trowbridge.

13 recordsLinked to original sources
PubMed1995

Ability of bacterial endotoxin to diffuse through human dentin.

An in vitro system was developed to determine whether bacterial endotoxin is capable of diffusing through dentin without the use of filtration pressure. Cavities were prepared in five third molar teeth in order to produce a split chamber device consisting of occlusal and pulpal chambers with 0.5 mm of intervening dentin. Endotoxin was introduced into the occlusal chamber and the effluent in the pulpal chamber was sampled every 30 min for 5 h and at 24 h using the limulus lysate assay. In four specimens the initial appearance of endotoxin in the effluent ranged from 15 min to 4 1/2 h. In two specimens the concentration of endotoxin in the effluent leveled off in 4 1/2 and 5 h, respectively, whereas in another two the concentration continued to increase throughout the experiment. In one specimen no endotoxin was detected. The results indicate that endotoxin is capable of passing through 0.5 mm of dentin.

Aggregatibacter actinomycetemcomitans↗
PubMed1990

Vascular network in papillae of dog oral mucosa using corrosive resin casts with scanning electron microscopy.

The purpose of this study was to undertake a three-dimensional analysis of the vascular network of the lamina propria in the gingiva, alveolar mucosa, buccal mucosa, palate, and lingual mucosa of the dog. Using the corrosive resin casting technique, casts of the vascular network were prepared and examined by scanning electron microscopy. In the oral mucosa, larger arteries in the submucosa divide into smaller branches that enter the lamina propria. These branches form one or more layers of vessels at the base of the papillae of the lamina propria, the so-called subpapillary vascular network. Here the vessels divide again and enter the papillae to form a subepithelial capillary network. The configuration of the capillary loops within each papilla of the lamina propria is determined by the shape of the papilla. The characteristic shape of the loops resembles a hairpin. The capillary loops in the lingual papillae are larger and more complex than capillary loops found elsewhere in the oral mucosa. The mucosa of the posterior portion of the hard palate, the soft palate, and the tongue contain many venous valves.

Animals↗
PubMed1984

Effects of local anesthetics on pulpal blood flow in dogs.

Effects of 2% lidocaine with epinephrine (1:100,000) administered by the various local anesthetic techniques--i.e., infiltration, mandibular block, and intraseptal injection--on pulpal blood flow in dogs were determined using the 15 microns radioisotope-labeled microsphere injection method. The pulpal blood flow decreased significantly with all three techniques; however, the most drastic reduction occurred in the molar teeth with the intraseptal injection. When 2% lidocaine without epinephrine was used in the intraseptal injection, pulpal blood flow increased significantly.

Anesthesia, Dental↗
PubMed1977

Abnormal immune response to infection of the dental pulp. Report of a case.

The following case illustrates an unusual response by the dental pulp to caries in an immunodeficient patient. The patient, a 14-year-old boy, suffered from thymic dysplasia and IgA deficiency. Deep dentinal caries produced relatively little destruction of the pulp and only a mild inflammatory response, in spite of the presence of a large number of bacteria in the pulp chamber. The patient's immunologic disorder was diagnosed as hereditary combined immunodeficiency of unknown type. However, it may have been a variant of Nezelof's syndrome.

Adolescent↗
PubMedDate not supplied

Microleakage of castings cemented with glass-ionomer cements.

When metal copings were luted to prepared, extracted teeth with KetacCem, ChemBond, TempBond, and zinc-oxide-eugenol (ZOE), only thermocycled ZOE exhibited severe leakage. It appears unlikely that postcementation microleakage is the cause of tooth sensitivity associated with the use of glass-ionomer cements.

Dental Cements↗