Preliminary Histological Evaluation of the Application of Ozone in the First Days of Orthodontic Force Induction in Animal Model.

Objectives:  The aim of the study was to histologically evaluate the effect of ozone therapy on orthodontic force induction in an animal model.

Materials And Methods:  Twenty-four Wistar rats were divided into three groups ( = 8). A NiTi coil spring was installed from the maxillary first molar to the maxillary central incisor.

Skeletal maturation in individuals with Down's syndrome: comparison between PGS curve, cervical vertebrae and bones of the hand and wrist.

Introduction: This study was conducted with the aim of adapting the methods developed by Martins and Sakima to assess skeletal maturation by cervical vertebrae in the pubertal growth spurt (PGS) curve. It also aimed to test the reliability and agreement between those methods and the method of hand and wrist radiograph when compared two by two and all together. 

Methods: The sample comprised 72 radiographs, with 36 lateral radiographs of the head and 36 hand-wrist radiographs of 36 subjects with Down's syndrome (DS), 13 female and 23 male, aged between 8 years and 6 months and 18 years and 7 months, with an average age of 13 years and 10 months.