© 2017 Dental Press Journal of Orthodontics Dental Press J Orthod. 2017 Sept-Oct;22(5):30-8 30 original article Cephalometric evaluation of adult anterior open bite non-extraction treatment with Invisalign Shuka Moshiri 1 , Eustáquio A. Araújo 1 , Julie F. McCray 1 , Guilherme Thiesen 1 , Ki Beom Kim 1 Objective: The purpose of this study was to evaluate, by means of cephalometric appraisal, the vertical effects of non-extraction treat- ment of adult anterior open bite with clear aligners (Invisalign system, Align Technology, Santa Clara, CA, USA). Methods: Lateral cephalograms of 30 adult patients with anterior open bite treated using Invisalign (22 females, 8 males; mean age at start of treat- ment: 28 years and 10 months; mean anterior open bite at start of treatment: 1.8 mm) were analyzed. Pre- and post-treatment cephalograms were traced to compare the following vertical measurements: SN to maxillary occlusal plane (SN-MxOP), SN to mandibular occlusal plane (SN-MnOP), mandibular plane to mandibular occlusal plane (MP-MnOP), SN to mandibular plane (SN-MP), SN to palatal plane (SN-PP), SN to gonion-gnathion plane (SN-GoGn), upper 1 tip to palatal plane (U1-PP), lower 1 tip to mandibular plane (L1-MP), mesiobuccal cusp of upper 6 to palatal plane (U6-PP), mesiobuccal cusp of lower 6 to mandibular plane (L6-MP), lower anterior facial height (LAFH), and overbite (OB). Paired t-tests and descriptive statistics were utilized to analyze the data and assess any significant changes resulting from treatment. Results: Statistically significant differences were found in overall treatment changes for SN-MxOP, SN-MnOP, MP-MnOP, SN-MP, SN-GoGn, L1-MP, L6- MP, LAFH, and OB. Conclusions: The Invisalign system is a viable therapeutic modality for non-extraction treatment of adult anterior mild open bites. Bite closure was mainly achieved by a combination of counterclockwise rotation of the mandibular plane, lower molar intrusion and lower incisor extrusion. Keywords: Open bite. Orthodontics. Orthodontic appliances. 1 Saint Louis University, Department of Orthodontics (Saint Louis, USA). Contact address: Ki Beom Kim Department of Orthodontics, Saint Louis University, 3320 Rutger Street Saint Louis, MO, 63104 – E-mail: kkim8@slu.edu Submitted: October 26, 2016 - Revised and accepted: April 18, 2017 DOI: https://doi.org/10.1590/2177-6709.22.5.030-038.oar How to cite: Moshiri S, Araújo EA, McCray JF, Thiesen G, Kim KB. Cephalo- metric evaluation of adult anterior open bite non-extraction treatment with Invis- align. Dental Press J Orthod. 2017 Sept-Oct;22(5):30-8. DOI: https://doi.org/10.1590/2177-6709.22.5.030-038.oar » The authors report no commercial, proprietary or financial interest in the products or companies described in this article. Objetivo: o objetivo desse estudo foi realizar uma avaliação cefalométrica dos efeitos verticais do tratamento sem extração de mor- didas abertas anteriores em adultos com o uso de alinhadores (sistema Invisalign, Align Technology, Santa Clara, CA, EUA). Méto- dos: foram analisados cefalogramas laterais de 30 pacientes adultos com mordida aberta anterior, tratados com o sistema Invisalign (22 do sexo feminino, 8 do sexo masculino, com idade média ao início do tratamento de 28 anos e 10 meses, e mordida aberta anterior média igual a 1,8mm). Os cefalogramas pré- e pós-tratamento foram traçados e as seguintes medidas verticais foram avaliadas: SN ao plano oclusal maxilar (SN-MxOP), SN ao plano oclusal mandibular (SN-MnOP), plano mandibular ao plano oclusal mandibular (MP-MnOP), SN ao plano mandibular (SN-MP), SN ao plano palatino (SN-PP), SN ao plano gônio-gnátio (SN-GoGn), incisivo central superior ao plano palatino (U1-PP), incisivo central inferior ao plano mandibular (L1-MP), cúspide mesiovestibular do molar superior ao plano palatino (U6-PP), cúspide mesiovestibular do molar inferior ao plano mandibular (L6-MP), altura facial anterior inferior (AFAI) e sobremordida (OB). Testes t pareados e estatística descritiva foram utilizados para analisar os dados e as alterações significativas resultantes do tratamento. Resultados: foram encontradas diferenças estatisticamente significativas durante o tratamento para SN-MxOP, SN-MnOP, MP-MnOP, SN-MP, SN-GoGn, L1-MP, L6-MP, AFAI e OB. Conclusões: o sistema Invisalign é uma modalidade terapêutica viável para o tratamento sem extração de mordidas abertas anteriores em pacientes adultos. O fechamento da mordida foi obtido principalmente por uma combinação de rotação do plano mandibular no sentido anti-horário, intrusão molar inferior e extrusão do incisivo inferior. Palavras-chave: Mordida aberta anterior. Ortodontia. Aparelhos ortodônticos.