Sample size calculation is part of the early stages of conducting an epidemiological,
clinical or lab study. In preparing a scientific paper, there are ethical and
methodological indications for its use. Two investigations conducted with the same
methodology and achieving equivalent results, but different only in terms of sample
size, may point the researcher in different directions when it comes to making
clinical decisions. Therefore, ideally, samples should not be small and, contrary to
what one might think, should not be excessive. The aim of this paper is to discuss in
clinical language the main implications of the sample size when interpreting a
study.
INTRODUCTION: An orthodontic or diagnostic setup consists in cutting and realigning the teeth in plaster models, making it an important resource in orthodontic treatment planning. OBJECTIVE: The aim of this article is to provide a detailed description of a technique to build an orthodontic setup model and a method to evaluate it. CONCLUSIONS: Although laborious, orthodontic setup procedure and analysis can provide important information such as the need for dental extractions, interproximal stripping, anchorage system, among others
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