Orthodontic treatment protocol in young adults with maxillary endognathia using the rapid palatal expander anchored in a mini-implant

Introduction: Maxillary endognathia is a skeletal malocclusion that, if left untreated, can evolve into a complex malocclusion, which hinders facial development and creates breathing problems due to nasal constriction. In 2010, Lee and collaborators created a mini-implant-assisted rapid maxillary expansion (MARPE) technique. Objectives: To describe the MARPE protocol and its clinical effects. Materials and methods: A bibliographic search was carried out in the Pubmed, Science Direct, Scielo and Google Scholar databases referring to the last 10 years. Results: The search strategies described enabled 150 articles to be obtained which went through various selection stages. In the end, 15 articles were evaluated and selected for this review. Discussion: The MARPE technique has reduced the skeletal, dento-alveolar and periodontal side effects caused by conventional appliances, optimizing the potential for skeletal expansion in individuals with advanced stages of skeletal maturation. Conclusion: The MARPE appliance has bone and dental anchorage. The clinical effects include the opening of the maxilla in the frontal plane, an increase in the volume of the nasal cavity after expansion, an increase in the interzygomatic distance, an increase in the average width of the face and the width of the alar base and widening of the nose. There was also a decrease in buccal bone thickness and alveolar crest height and a buccal inclination in the premolars and molars. In carrying out this research, we found that there are few or practically no studies on the effect on the pulp cavity, root resorption and orbital volume.