EFFECT OF OCCLUSAL ADJUSTMENT ON POSTORTHODONTIC　RELAPSE IN EXTRACTION CASES: A　RANDOMIZED CLINICAL TRIAL

• Autores: Jahanbin, Arezoo, Omidkhoda, Maryam, Zia, Farnaz, Madani, Azam Sadat, Koohrokhi, Ali, Kazemi, Mona, kazemi, mona
• Formato: artículo
• Fecha de Publicación: 2026
• Institución: Universidad Científica del Sur
• Repositorio: Revistas - Universidad Científica del Sur
• Lenguaje: inglés
• OAI Identifier: oai:revistas.cientifica.edu.pe:article/2963
• Enlace del recurso: https://revistas.cientifica.edu.pe/index.php/odontologica/article/view/2963
• Nivel de acceso: acceso abierto
• Materia: orthodontics; occlusal adjustment; orthodontic relapse; ortodoncia; recidiva ortodóncica; ajuste oclusal

Objectives: Maintaining post-treatment occlusal stability remains a major challenge in　orthodontics. Premature occlusal contacts may contribute to relapse. This study aimed to evaluate　the effect of selective occlusal adjustment on relapse six months after debonding. Materials and　Methods: Thirty Class I patients (17–28 years) with severe crowding, treated with fixed appliances　and extraction of first premolars, were randomly assigned to an intervention group (occlusal　adjustment one month after debonding) and a control group (no adjustment). Relapse was assessed　on dental casts immediately post-debonding and six months later, measuring inter-canine width,　intermolar width, arch length, and Modified Little’s Irregularity Index. Data were analyzed using　independent and paired t-tests, Mann-Whitney, Wilcoxon, and chi-square tests (α = 0.05). Results:　This study demonstrated that after occlusal adjustment, the maxilla showed significant increases　in intermolar width, intercanine width, and arch Circumference compared with the controls after　six months post-debonding (p = 0.009, 0.011, 0.041). In the mandible, the changes in intermolar　width and arch Circumference were significantly greater than those in the control group (p = 0.037　and p = 0.010, respectively), and the irregularity index in the intervention group decreased in the　maxilla and increased in the mandible compared to the control group; however, these changes were　not significant in either arch. Conclusion: Selective occlusal adjustment may enhance transverse　arch stability after orthodontic treatment; however, its isolated effect on anterior alignment relapse　remains inconclusive.