Background: Third molar influence on anterior crowding is controversial, However, it is assumed that they play a major role in compromising dental arch space. Aim: To review the literature to clarify the role of third molars in anterior crowding and relapse after orthodontic treatment by means of a systematic review. Material and methods: A systematic search was conducted based on an electronic search of several databases (Pub Med, ScienceDirect, Cochrane Library) covering publications from 2010 to January 2022. The search was performed using the acronym PICOS, limited to the following keywords in English and French: «wisdom tooth» OR« third molar »AND «anterior teeth crowding». Results: On the basis of the keywords, 549 bibliographical references were initially identified. After the elimination of duplicate references and studies, the number of articles was reduced to 315. A review of titles and abstracts resulted in the selection of 23 articles. After reading the full text, 6 articles were included in this systematic review. Conclusion: No relationship between the incisors crowding and the presence of third molars was identified. Therefore, the indication for prophylactic removal of third molars to avoid incisor crowding is not justified.

Background: Surgically assisted maxillary expansion has been used for the treatment of transverse maxillary deficiency in adult patients. The aim of this study is to evaluate, through a systematic review, the effect of this therapy on the dimensions of the aeropharyngeal dimensions and on the improvement of nasal ventilation. Materiel and method: 5 databases have been explored from 2010 (Pubmed, Scopus, Embase, Cochrane and Web of Science) using keywords expansion AND airway AND volum. After evaluating title, abstract and full text of articles found from databases, only 11 matching the inclusion criteria were included in the systematic review. Results: All the studies have shown that, in addition to its action on the maxillary bone, surgically-assisted maxillary expansion induces also an enlargement of the nasal floor and a reduction in airflow resistance, which promotes an improvement in nasal breathing. Conclusion: this surgical approach may lead to a modification in upper airway’s dimension and improvement of nasal ventilation.

Background: Obstructive Sleep Apnea (OSA) is considered to be a real public health problem, often unrecognized or underdiagnosed, requiring multidisciplinary care including orthodontics that plays an essential role in the screening and the management of ventilation. Objective: The aim of our study is to explain the important place of orthodontic therapies, whether orthopedic or surgical, in the multidisciplinary management of OSA and in the improvement of nasal breathing through a systematic review. Material and methods: A search of the literature was performed in the following databases: PubMed, ScienceDirect, Cochrane Library . The search was limited to publications written in English and French from 2010 to January 2022. Results: On the basis of the keywords, eighty-three references were initially identified. After the elimination of duplicates, the number of articles was reduced to seventy-nine. The study of the titles and abstracts made it possible to select fifty articles. After reading the full text, sixteen publications were included in this systematic review. Eight studies have investigated rapid maxillary expansion (RME), five studies have evaluated the effect of mandibular advancement (MA) and three studies have investigated the effect of genioplasty in children with OSA. Conclusion: Orthodontic arsenal, whether orthopedic, orthodontic, or surgical correction of jaws, is well suited and extremely beneficial for OSA treatment.

Objective: Skeletal openbite's control, is an effective challenge in orthodontics. In adults, treatment of severe skeletal open bite consists mainly of surgically repositioning the maxilla or the mandible. Recently, molar intrusion by using skeletal anchorage has been developed as a new strategy for open-bite treatment. The aim of this research is to compare the effectiveness of 2 approaches: Molar intrusion Vs surgical impaction in skeletal open bite's control through a systematic review. Material and Methods: A search of the literature was performed in the following data bases: PubMed, Science Direct, Cochrane library. The search was limited to publications written in english and french from 2010 to 2021 Results: Out of 83 references initially identified, 12 corresponded to our inclusion criteria. These studies have looked at molar intrusion using skeletal anchorage or surgical impaction of the maxillary with or without mandibular osteotomy in the treatment of skeletal open bite. These studies have reported an increased incisal coverage, decreased lower facial height, counterclockwise rotation of the mandible, and a satisfactory stability of results. Conclusion:The intrusion of molars using implant anchorage seems to be the most rational therapeutic procedure for skeletal open bite patients offering satisfactory skeletal and dento-alveolar results.