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

Cláudio Rodrigues Leles, Thalita Fernandes Fleury Curado, Lays Noleto Nascimento, Jesio Rodrigues Silva, Marcella Silva de Paula, Gerald McKenna, Martin Schimmel

Research output: Contribution to journalArticlepeer-review

13 Downloads (Pure)

Abstract

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.
Original languageEnglish
JournalJournal of Oral Rehabilitation
Early online date29 Apr 2024
DOIs
Publication statusEarly online date - 29 Apr 2024

Fingerprint

Dive into the research topics of 'Changes in masticatory performance and bite force after treatment with mandibular overdentures retained by four titanium–zirconium mini implants: One‐year randomised clinical trial'. Together they form a unique fingerprint.

Cite this