RESUMO
The orthodontic tooth movement is a biological response to orthodontic force. The biological response is very strongly-related to local bone metabolism. There is a strong evidence in the literature that bone metabolism can be altered by drugs. There are various studies published in dental journals on administration of drugs for the purpose of affecting orthodontic tooth movement both for augmentation of anchorage and to increase the rate of tooth movement. Most of these studies are animal studies. The aim of this article is to give insight to how to convert drug dose from animal studies to human trails. Dose per kilogram of body weight for one species is not the same for another species, it has to be converted first based on body surface area (BSA)normalization method. BSA correlates well across several mammalian species with several parameters of biology, including oxygen utilization, caloric expenditure, basal metabolism, blood volume, circulating plasma proteins, and renal function.