<prompt> Which of the following is a feature of Class I type 3malocclusion?Posterior crossbiteAnterior crossbiteMesial drifting of molarsProtrusion of mandibular incisors  <response>: Dewey 1915 divided Angles class I into five types and Angles class III into three types. There were no modifications for class II. He considered the same molar relationship as in Angles classification.Modifications of class I malocclusionType I - Crowded anterior teethType II - Maxillary incisors in labioversionType III - Anterior cross-biteType IV - Posterior cross-biteType V - Molars are in mesioversion due to shifting following loss of a tooth anterior to the first molars; all other teeth are in a normal relationship.Reference: Orthodontics: Diagnosis and Management of Malocclusion and Dentofacial Deformities 3rd O P Kharbanda, pdf no 333 