Sobrevida e desfechos periimplantares de overdentures mandibulares retidas por quatro mini implantes de titânio-zircônia: ensaio clínico randomizado de um ano de acompanhamento
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Data
2023-02-15
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Universidade Federal de Goiás
Resumo
Mandibular overdenture is considered the standard treatment for completely edentulous
patients, with excellent cost-effectiveness and high success rates. The traditional technique
consists of installing two implants of conventional diameter, its use being limited in very
resorbed ridges with reduced thickness. Mini-implants are small-diameter implants that have
recently been used to retain overdentures with satisfactory success rates. The aim of this study
is to evaluate the survival and peri-implant outcomes of a mini-implant system for overdenture
retention and the influence of surgical and loading protocols performed. The present study
consists of a 2x2 factorial randomized clinical trial where 74 total edentulous participants
underwent the installation of four mini-implants for overdenture retention in the mandibular
interforaminal region, totaling 296 mini-implants. They were randomized into four groups
according to the surgical protocol and prosthesis loading: Immediate/Flapless = 17 (23.0%);
Immediate/Flapped = 18 (24.3%); Delayed/Flapless = 20 (27.0%); and Delayed/Flapped = 19
(25.7%). Most participants (64.9%) were female and the mean age at surgery was 64.1 ± 8
years. The survival rate during the 1-year follow-up was 100%. No major biological
complications were observed, such as abnormal marginal bone loss or sulcus depth. The plaque
index remained stable at the follow-ups (3, 6 and 12 months after capture) while the bleeding
index significantly reduced at the 6 and 12 months follow-ups compared to the baseline index
(3 months). Probing depth and gingival margin height remained stable over the follow-up
periods. The mean overall marginal bone loss was 0.68 (±0.68) mm after three months and
0.89 (±0.75) mm after one year. The flapless protocol showed better results in stability and
soft tissue health and a slightly higher risk of marginal bone loss. The findings suggest that the
mandibular overdenture retained by this new mini-implant system is a safe and predictable
treatment option with regard to implant survival and peri-implant outcomes, even when flapless
surgery and immediate loading are adopted.
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CURADO, T. F. F. Sobrevida e desfechos periimplantares de overdentures mandibulares retidas por quatro mini implantes de titânio-zircônia: ensaio clínico randomizado de um ano de acompanhamento. 2023. 61 f. Dissertação (Mestrado em Odontologia) - Universidade Federal de Goiás, Goiânia, 2023.