PubMed · 5253038
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B S Margolis. 1969. Preformed bases for study models.. https://pubmed.ncbi.nlm.nih.gov/5253038/
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During the last century orthodontic treatment philosophies changed continuously. The necessity to extract teeth in order to correct a lack of space has many times been the subject of discussion. In fact there exists several techniques which make it possible to avoid extractions in many cases. A number of criteria which influence the decision to extract or not, as well as some techniques to regain space in upper and lower arch are discussed.
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