Effects induced after the use of maxillary protraction appliances: a literature review

Abstract

OBJECTIVE: The present literature review, examined the effects of maxillary protraction in patients treated with different types of facial masks. METHODS: The review searched for relevant articles, including randomized controlled trials, controlled clinical trials and uncontrolled trials. Comparisons were made between eight different types of facial masks: Delaire; Grummons; Petit; Turley; Batista; "Sky Hook"; Nanda and Türbinger. Following aspects were evaluated: a) the type of anchorage; the origin, direction and magnitude of forces and b) the relevant results of following skeletal and dental measurements: angular (SNA and SNB), linear (AFAI); vertical angles (SN.GoGn, FMA); dental (IMPA) and linear (1-NA, 1-NB). CONCLUSION: The results showed that there was no uniformity in the choice of anchorage type and form of application of forces between the facial masks examined, but there were similarities in skeletal and dental aspects: Anterior displacement of the maxillary complex (increase in SNA) ; anterior displacement of the upper anterior teeth (increase of 1-NA), the lingual inclination of mandibular incisors (decrease of 1-NB), down and back rotation of the mandible (increase AFAI, SN.GoGn, FMA, decrease in SNB).

Efeitos da tração reversa nas vias aéreas superiores

“…Quanto às divergências vistas nos resultados obtidos, podem ser explicadas na medida em que diversos fatores como: a gravidade da má oclusão de Classe III, a escolha do dispositivo de expansão, idade, duração do tratamento e a cooperação do paciente podem isolada ou conjuntamente influenciar no resultado do tratamento [1][2][3][4][5][6][7][8][9][10][11][12][13] .…”

“…Os resultados favoráveis se deram independente da aparatologia utilizada, sendo constatadas modificações que promoveram o aumento entre as suturas zigomáticas, distância intermolares nos arcos superior e inferior, e distância intercaninos superior, mostrando conformidade com outros estudos [5][6][11][12][13] .…”

Analysis of orthopedic treatment of skeletal Class III malocclusion with Rapid Palatal Expansion and Face Mask therapy

“…The early treatment of Class III malocclusion due to maxillary atresia is directly related to the level of patient cooperation, which is a decisive factor for success, and it is usually difficult for them to adapt to the use of the facial mask [13,14]. In addition, this malocclusion affects dentofacial appearance and harmony, causing psychological problems for children, and may develop negative attitudes of self-depreciation and low selfesteem [15][16][17][18].…”

“…The expansion mechanics opposes the tendency of maxillary contraction during protraction. However, this therapeutic approach has a precise indication for those patients who are deficient in the development of the middle third of the face, with or without Class III malocclusion [1][2][3][4][5][6][7][14][15][16]18].…”

“…The magnitude, vector direction of the force applied, and the number of hours per day are extremely important for the success of RMT therapy. The direction of the force vector is forward and down, varying the degree of inclination, between 20° to 45° with respect to the occlusal plane, with 80gf to 800gf for 10 hours per day or for full time [1][2][3][4][5][6][7][14][15][16]18].…”