Changes in masticatory performance and bite force after treatment with mandibular overdentures retained by four titanium-zirconium mini implants: One-year randomised clinical trial.

Autor: Leles CR; School of Dentistry, Federal University of Goias, Goiania, Brazil.; Division of Gerodontology, Department of Reconstructive Dentistry, School of Dental Medicine of the University of Bern, Bern, Switzerland., Curado TFF; School of Dentistry, Federal University of Goias, Goiania, Brazil., Nascimento LN; School of Dentistry, Federal University of Goias, Goiania, Brazil., Silva JR; School of Dentistry, Federal University of Goias, Goiania, Brazil., de Paula MS; School of Dentistry, Federal University of Goias, Goiania, Brazil., McKenna G; Centre for Public Health, Queen's University Belfast, Belfast, UK., Schimmel M; Division of Gerodontology, Department of Reconstructive Dentistry, School of Dental Medicine of the University of Bern, Bern, Switzerland.; Division of Gerodontology and Removable Prosthodontics, University Clinics of Dental Medicine, University of Geneva, Geneva, Switzerland.
Jazyk: angličtina
Zdroj: Journal of oral rehabilitation [J Oral Rehabil] 2024 Aug; Vol. 51 (8), pp. 1459-1467. Date of Electronic Publication: 2024 Apr 29.
DOI: 10.1111/joor.13722
Abstrakt: Objective: This prospective study is part of a randomised clinical trial and reports the changes in masticatory performance (MP) and bite force, and explores their influential factors, 1 year after the provision of mandibular overdentures retained by four titanium-zirconium mini implants.
Methods: Edentulous patients received conventional complete dentures, followed by placement of four mini implants (Straumann® Mini Implant System) in the anterior mandible and converting the conventional prosthesis into a mandibular overdenture. Treatment protocols were randomised using a 2×2 factorial design combining different surgical (flapped vs. flapless) and loading (immediate vs. delayed) protocols. MP was assessed using a two-colour mixing ability test and a colorimetric analysis to measure the level of colour mixing (Variance of Hue-VoH). Maximum voluntary bite force (MBF) was measured by a digital gnathodynamometer in the posterior and anterior regions. Sex, age, surgical and loading protocols and ridge morphology were tested as independent variables. MP and MBF tests were performed at baseline (pre-treatment) and the 3-, 6- and 12-month after implant loading. Descriptive statistics, independent t-test, and linear mixed-effect model (LMM) regression were used for data analysis.
Results: Seventy-four participants were assessed and 73 completed the 1-year follow-up. Statistically significant improvements in functional parameters were observed in all follow-up periods compared to baseline (p < .001). The flapless protocol was associated with higher improvement in MP at the 3-month follow-up (p = .004), while less resorbed ridges were associated with better MP (p = .038) and higher MBF (p < .001).
Conclusion: The mandibular overdenture protocol using four titanium-zirconium mini implants was effective in improving MP and MBF of edentulous patients, compared to pre-treatment values. The findings also suggest that improvements in chewing function and bite force are impacted by clinical factors since better outcomes were observed for flapless surgeries and less resorbed edentulous ridges.
Clinical Trial Registration: ClinicalTrials.Gov ID NCT04760457.
(© 2024 The Authors. Journal of Oral Rehabilitation published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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