Stability of anterior open bite treatment with bonded spurs in the mixed dentition: a longitudinal follow-up

• Ano de defesa: 2025
• Autor(a) principal: Carneiro, Gabriela Utrago
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Biblioteca Digitais de Teses e Dissertações da USP
• Palavras-chave em Português: Aparelhos ortodônticos; Interceptive; Mordida aberta; Open bite; Orthodontic appliance; Ortodontia interceptora
• Link de acesso: https://www.teses.usp.br/teses/disponiveis/25/25144/tde-12052025-170920/

Objective: This study aimed to evaluate the long-term stability of anterior open bite (AOB) treatment using bonded spurs (BS) in the mixed dentition after a four-year follow-up period. Methods: Longitudinal data from a randomized clinical trial (RCT) (NCT03702881), approved by Ethics Committee of the Bauru Dental School (FOB-USP), were analyzed. This previous study included 49 patients aged 7 to 11 years who were treated with BS between 2017 and 2019. After 4-year of follow-up, 45 patients were contacted and 36 returned for assessment. In the original RCT, patients were evaluated before treatment (T1) and after 12 months of treatment with BS (T2). For the present study, new orthodontic records were taken in the young permanent dentition (T3), approximately 4-year after T2 in order to evaluate the long-term stability. This study included cephalometric and digital model analysis at T1, T2 and T3 with overbite changes as the primary outcome. Interphase comparisons were performed using repeated-measures Analysis of Variance (ANOVA) followed by Tukey test or Friedman test (P<0.05). The influence of initial AOB severity, facial growth pattern and post-treatment myofunctional therapy on overbite changes from T2 to T3 was evaluated using multiple linear regression analysis. Results: The stability rate of AOB treatment with BS in the mixed dentition ranged from 84.62% to 91.2%. Overbite increased progressively throughout treatment and follow-up, with significant changes in incisor inclination and extrusion, clockwise mandibular plane rotation and increased lower anterior facial height. Only four patients (15.38%) demonstrated a decrease in overbite, but two of four (7.69%) still maintained positive overbite. Mandibular and maxillary arch dimensions decreased during treatment and remained stable or showed a slight reduction during follow-up. No statistically significant influence was found for initial AOB severity, facial growth pattern or myofunctional therapy history on long-term overbite changes. Conclusion: Bonded spurs are a clinical alternative to treat the anterior open bite in the mixed dentition providing a high rate of long-term stability.