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PubMed2000

Effect of a fifth-generation bonding agent on vascular responses in rats.

In the last years, several single-bottle dental adhesives have been developed. They are supposed to chemically adhere to dentin, and a liner to protect pulp is not thought to be necessary. In the case of direct pulp capping, hemorrhage control is an important step in success, but little is known about the effect of these new bonding agents on pulpal bleeding. The aim of this study was to evaluate the effect of a new one-step single-bottle adhesive on the smooth muscle contraction of rat uterine muscle and carotid arteries. Efficacy of the bonding agent was compared with that of epinephrine (control), and the contraction forces induced were recorded using a force displacement transducer. Statistical analysis of data revealed that the bonding material produced epinephrine-like concentration-dependent contractions of the smooth muscle, suggesting that one-step bonding agents may act as candidates for hemorrhage control without the use of an additional agent in direct pulp capping procedures.

Analysis of Variance↗
PubMed1987

Bacterial contamination as a factor influencing the toxicity of materials to the exposed dental pulp.

Three materials, which had been previously found to be toxic when applied as pulp-capping agents in conventional rat molar pulps, were retested in germ-free rats. All produced much more favorable responses in the pulp, with a lack of inflammation and the presence of dentine bridges in the majority of teeth. It appears that much of the pulp damage previously attributed to the chemical toxicity of materials may be caused by the presence of bacteria. The design of studies intended to evaluate the response of the pulp to materials should include staining techniques that will detect the presence of bacteria on the floors of test cavities.

Aluminum Hydroxide↗