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Abstracts presented at the 44th general meeting of the International Association for Dental Research are presented, including "Functional Interpretation of Molar Evolution," by Percy M. Butler, "The Recording Microdensitometer As a Research Tool in the Study of Oral-Facial Development," by Harry Israel, Stanley M. Garn, and Charles Colbert, and "Cellular Differentiation in Palatal Processes Prior to Fusion, as Demonstrated by Organ Culture Methods," by Michael Pourtois.

The article focuses on the radiographic density of dental enamel and dentin. It states that a microdensitometer was used to examine premolars and canines to determine the absolute and relative values of tissue density. It mentions that mathematical equations describing the attenuation of x-rays through homogeneous materials make it possible to ascertain the total tissue present in a tooth specimen.