Cyanoacrylate glue in socket repair: a comparative study.

This study aimed to compare socket repair with Nylon 5-0 suture and closure using cyanoacrylate biological glue after tooth extraction. Twenty male Wistar rats, each weighing approximately 200 g were submitted to the extraction of the right and left first molar teeth. On the right side, the alveolus was closed with 2 ethyl-cyanoacrylate glue, whereas on the left side closure was with a single interrupted Nylon 5-0 suture (Ethilon). The animals were sacrificed after 3, 7, 15, and 30 postoperative days, and images of histological sections of the alveolus were captured for analysis. Histomorphometry was performed using Image J software to quantify bone neoformation in the alveolus. The results showed that on the seventh postoperative day the side treated with 2-ethyl-cyanoacrylate presented a delay in relation to the sutured side. However, on days 15 and 30, the difference in bone neoformation between gradually decreased until the thirtieth postoperative day, with no significant difference in bone neoformation in the last period of analysis. There was no difference between neoformation in the two sides (p = 0.902) after statistical analysis of the histomorphometric results. In conclusion, socket repair after alveolus closure with 2-ethyl-cyanoacrylate allows complete bone neoformation after tooth extraction, and there is no significant difference when compared with closure with Nylon 5-0.

Expirical relationships among heat stress indices in 14 hot industries.

This study develops empirical relationships between several indices of heat stress derived from a series of studies in 14 representative, hot industries. With particular emphasis on Wet Bulb-Globe Temperature, the analysis verifies and supplements certain relationships between heat stress indices developed by other investigators. Because of its large industrial data base, the study also provides a reliable basis for interrelating heat stress indices in future standard-setting procedures.

An improved method for monitoring heat stress levels in the workplace.

Studies in 15 industries revealed characteristic empirical relationships between workplace environmental conditions and outside weather conditions. These relationships, expressed in the form of predictive models for Wet Bulb Globe Temperature, can be used to estimate WBGT from weather forecasts, weather reports, or current meterorological measurements.