Citation Information :
Behnaz M, Dalaie K, Seyedsalehi S, Shekarian S. Cephalometric Assessment of Changes in Vertical Facial Height Following Extraction of Mandibular Second Premolars in Adult Long-face Patients with Skeletal Open Bite: A Case Series. J Contemp Dent 2019; 9 (2):95-100.
Aim: Anterior open bite has a multifactorial etiology and high tendency to relapse. Thus, treatment of this malocclusion is challenging. Tooth extraction has been proposed by some researchers for correction of skeletal anterior open bite. This study aimed to assess cephalometric changes of vertical facial height in patients with skeletal open bite following extraction of mandibular second premolars. Materials and methods: Thirteen adult patients with a mean age of 24.08 years underwent extraction of second premolars and fixed orthodontic treatment for correction of skeletal anterior open bite. Lateral cephalograms of patients were evaluated at baseline, immediately after treatment and 1 year after treatment. Some cephalometric parameters such as the sum of posterior angles, sella-nasion-mandibular plane (SN-MP), lower anterior facial height (LAFH), upper 1-sella-nasion (U1-SN), incisor mandibular plane angle (IMPA), and overbite were measured and compared at different time points. Cephalometric data were analyzed using SPSS via the repeated measures ANOVA. Results: Treatment resulted in positive overbite, which remained stable at 2 years after treatment. The sum of posterior angles, the Jarabak index, SN-MP, LAFH, sella-nasion-B point (SNB), A point-nasion-B point (ANB), U1-SN, and IMPA also showed statistically significant changes (p < 0.05). Conclusion: Open bite closure in patients was mainly due to relative extrusion and retrusion of anterior teeth in both jaws. The results at the 24-month follow-up showed stability of treatment, although longer follow-ups are required to reach a definite judgment. Clinical significance: This treatment can help long-face patients who are not candidate of orthognathic surgery because of complicated systemic conditions or those patients who do not want to have any surgery.
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