Do Clinical Outcomes Differ With Single Vs Two Implant- Supported Mandibular Overdentures? A Meta-Analysis of Randomized Controlled Trials

doi:10.11607/jomi.11358

AutoresMingfu Ye, Wenjun Liu, Javier Calatrava, Hom‐Lay Wang, Wenxia Huang

Por qué importa

Un metaanálisis de ensayos controlados aleatorizados ha comparado los resultados clínicos de sobredentaduras mandibulares soportadas por uno o dos implantes. La investigación buscó determinar si existían diferencias significativas en la supervivencia de los implantes, la pérdida ósea marginal y las complicaciones protésicas. Aunque la evidencia preliminar sugiere una posible menor tasa de fracaso de implantes en el grupo de un solo implante a corto y medio plazo (particularmente entre 2 y 3 años de seguimiento), los resultados globales a 1 y 5 años no alcanzaron significación estadística. Respecto a la pérdida ósea y las complicaciones protésicas como fracturas o desprendimientos de componentes, el estudio no encontró diferencias notables entre ambas configuraciones. Estos hallazgos, basados en un número limitado de estudios y con muestras pequeñas, aportan información relevante para la toma de decisiones clínicas en casos de edentulismo mandibular.

Abstract original

PURPOSE: To examine whether mandibular overdentures supported by a single implant vs two implants have similar clinical outcomes, especially pertaining to implant survival, marginal bone loss (MBL), and prosthetic complications. MATERIALS AND METHODS: A systematic review and meta-analysis of randomized controlled trials (RCTs) was conducted. Scientific databases (PubMed, Embase, Scopus, Web of Science, and Cochrane Library) were searched from inception until October 2024. These databases were searched for RCTs comparing single- implant- and two- implant-supported mandibular overdentures that reported implant failures, MBL, and prosthetic complications. RESULTS: Eleven RCTs were included. The meta-analysis showed reduced implant failure rates with single implants at 1 year (OR: 0.33; 95% CI: 0.10, 1.15; I2 = 0%) and 5 years (OR: 0.11; 95% CI: 0.01, 2.16), but the results were not statistically significant. However, pooled subgroup analyses of studies with a follow-up period of 2 to 3 years indicated a significantly reduced implant failure rate with a single implant compared to two implants (OR: 0.12; 95% CI: 0.03, 0.54; I2 = 0%). No significant differences between the implant failure rates were observed between the two groups based on implant loading protocols. Meta-analysis also showed that there were no significant differences in the risk of MBL between single- and two-implant groups (MD: -0.15; 95% CI: -0.31, 0.01; I2 = 43%). The pooled analysis also showed that the risk of overdenture fracture, relining, and metal housing reattachment did not differ significantly between single- and two-implant groups. CONCLUSIONS: Evidence from a limited number of RCTs, mainly with small sample sizes, indicates that single- implant-supported mandibular overdentures may have a tendency to cause implant failures at a lower rate than two- implant-supported mandibular overdentures. The risk of MBL and prosthetic complications may not differ between the treatment modalities.

Leer texto completo ↗DOI · 10.11607/jomi.11358

Autor Doctor&Cols

Javier Calatrava Serrano de Haro
Cirugía Oral e Implantología

Cómo citar

Ye M, Liu W, Calatrava J, Wang H, Huang W. Do Clinical Outcomes Differ With Single Vs Two Implant- Supported Mandibular Overdentures? A Meta-Analysis of Randomized Controlled Trials. The International Journal of Oral & Maxillofacial Implants. 2025. doi:10.11607/jomi.11358