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The article investigates the respiration of pulp tissue obtained from the incisors of New Zealand rabbits and white rats. An experiment is described and findings are discussed. Among results presented are figures for the mean endogenous oxygen consumption of rat and rabbit incisor pulp, and the respiratory quotients for both.

The article discusses the composition of human calcified tooth tissue. Procedures for collecting and analyzing sample canines, incisors, and molars are described, and results are discussed. Findings are presented for nitrogen content, components labile to heat at 900 degrees centigrade, and KOH-ethylene glycol extractable fractions.

The article investigates the moisture content of tissue in calcified teeth. An experiment is described and findings are discussed. Among results presented are those for the maximum moisture content of whole teeth and dentin, and the maximum moisture content of whole teeth, powdered enamel, and dentin that were previously conditioned at certain temperatures and humidity levels.

The article reports on the results of research which was conducted in an effort to examine the composition of Syrian hamster enamel and dentin tissues that had been extracted with or without the use of KOH-ethylene glycol. Researchers found that the protein content of the tissues was usually less than in tissues removed by KOH and that some calcium, phosphorus and magnesium was removed during the extraction process.

The article discusses a study on the effect of fluorides on the dissolution of dentin. Researchers subjected dentin to various conditions and studied the rate at which it decalcified in a Morse solution of phosphorus, calcium, carbon dioxide, and magnesium. It was found that dentin treated with fluoride dissolved slower than dentin without fluoride.

The article discusses a study on the reduction abilities of homo and heterofermentative lactobacilli in the mouth. Researchers subjected 2, 3, 5-triphenyltetrazolium chloride (TTC) to cultures of lactobacilli. It was discovered that homofermentative lactobacilli reduced TTC more effectively than heterofermentative bacteria.

The article presents research on the variations in the amino acid composition of dentin and enamel. Tooth tissues were separated and decalcified by Battistone's and Burnett's methods. The tissues of powdered teeth were separated by a modified flotation technique or the enamel was separated from the dentin by chipping. The test results are also provided.

The article presents quantitative research of the amino acid composition of dentin decalcified by a chelating agent near neutrality and of a water soluble extract of powdered dentin. The analyzed dentin belonged to caries-free, permanent human teeth from men above the age of 18. A chart is also presented which details the amino acids in human dentinal protein.

The article discusses a study that looked at the physical makeup of the calcified tooth tissue. A synopsis of the study is presented. Results of the study are discussed, including that half of the teeth studied were covered with enamel and the other half of the teeth were covered in dentin. Elements that were found to be on the teeth are mentioned, including calcium and phosphorus.

The article discusses a study on the impact of protein coagulants on the composition of dentin. Researchers exposed organic and inorganic components of dentin to various protein coagulants including zinc chloride, potassium ferrocyanide, and silver nitrate. They found that these coagulants did not affect the organic dentinal matrix, and their effects on solubility varied depending on which decalcifying acids were used.

The article discusses a study on the impact of fluorides on the composition of dentin. Researchers tested numerous fluorides including sodium fluoride, lead fluoride, and calcium fluoride. They found that sodium fluoride was the most effective at reducing solubility. Lead fluoride and calcium fluoride had varying effects on solubility.

The article presents a chemical analysis of the teeth of Syrian hamsters. The analysis of the principal organic constituents of the enamel and dentin of the teeth is described. A history of the usage of the Syrian hamster in laboratory research is also provided, noting that the results of the study will aid in determining the future usage of Syrian hamsters in dental caries studies.

The article presents a study which examines the respiration of human salivary microbial flora. The species of microorganisms describes as being active within dental caries are mentioned, including lactobacilli, streptococci, and proteolytic bacteria. The action of carbohydrates and inhibitors on the metabolism of salivary microorganisms is also studied.

The article reports on the effect of proteolytic and acidogenic bacteria from dental caries on dentin. Dental caries can be caused by proteolysis of food on the teeth, acidogenic bacteria which decalcifies the teeth, as well as other organisms which lyse dentin's organic matrix. Research included 17 strains of lactobacilli which were isolated from carious lesions. It was found that these digested decalcified dentin proteins while there was no discernable action from the cocci bacteria.

The article investigates the accessibility of the organic dentinal matrix. An experiment is described and results discussed. The authors demonstrate that the organic matrix of dentin is liberated by the decalcification of certain organic and inorganic acids, commensurate with the extent of decalcification.

The article discusses a study on the bacteria present in dentinal lesions. Researchers obtained freshly removed teeth that had deep dentinal caries. These teeth were placed in Petri dishes and periodically examined. It was discovered that cocci, actinomyces, and lactobacilli bacteria were the only bacteria that consistently appeared in the caries.

In this article the authors used paper chromatography to analyze the amino acid content of enamel protein. Ethylenediamine tetraacetic acid (EDTA) was used to prepare the enamel protein for analysis. The results of the tests were that the amino acids accounted for 99.21 percent of the total nitrogen of enamel.