title: A method to evaluate and compare roentgenograms.
abstract: A simple and practical method is suggested to evaluate and compare roentgenograms concerning optical density and contrast. The method is specifically indicated for research in which a metallic stepwedge penetrometer and a photodensitometer are used. A PC computer may be optionally employed for the mathematical and statistical processing of the data.
authors.affiliation: Faculdade de Odontologia de Ribeirão Preto, Universidade de São Paulo, Brasil.
authors.forename: G C
authors.initials: GC
authors.lastname: Campos
authors.forename: J R
authors.initials: JR
authors.lastname: Tamburús
mesh_terms: D003287:Contrast Media; D003720:Densitometry; D005069:Evaluation Studies as Topic; D006801:Humans; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D011861:Radiography, Dental / Q000592:standards*; D012044:Regression Analysis
chemical_list: D003287:Contrast Media