Title: 0971 - Are One-Implant Overdentures Superior to Complete Dentures in Masticatory Function?


Thuy Vo (Presenter)
Tokyo Medical and Dental University

Manabu Kanazawa, Tokyo Medical and Dental University
Khaing Thu, Tokyo Medical and Dental University
Mari Asami, Tokyo Medical and Dental University
Anna Miyayasu, Tokyo Medical and Dental University
Ryo Shimada, Tokyo Medical and Dental University
Daisuke Sato, Showa University Dental Hospital
Shohei Kasugai, Tokyo Medical and Dental University
Shunsuke Minakuchi, Tokyo Medical and Dental University


Objectives: The aim of this study was to clarify the superiority in masticatory function of single implant overdentures to conventional complete dentures through a randomized crossover control trial.

Methods: New complete dentures were fabricated for 22 patients participating in this study. One implant was inserted in the middle of the symphyseal region of each patient. After implant operation, the participants were randomly allocated into 2 groups: Group IC experienced one-implant overdenture (IOD) period, and group CI underwent complete denture (CD) period for the first 2 months and vice versa for the next 2 months. Mixing ability with colour changeble chewing gum and comminuting ability with test gummy jelly were measured to evaluate masticatory function. The assessments were performed at baseline (the old CD), the end of CD period (the new CD) and the end of IOD period (the IOD). The differences between 3 prostheses were analyzed using Friedman and Wilcoxon signed-rank test (α=0.05).

Results: One patient in group IC dropped out in the 3-month healing period because of a premature implant failure, resulting in 21 patients for data analyses. Both the new CD and the IOD improved the mixing ability significantly (p<0.05), but the mixing ability of the IOD was significantly better than that of the new CD (p<0.01). IOD also showed significanly superior in comminuting ability to both old and new CD (p<0.001), with no substantial differences between two these prostheses (p>0.05).

Conclusions: New CD might minimize pain and provide a better fitness, resulting in improved mixing ability. However, the single implant therapy with better stability and retention can restore masticatory function of edentulous patients to a better level than the new and clinically acceptable conventional dentures.

This abstract is based on research that was funded entirely or partially by an outside source:
ITI Foundation, Switzerland (1025_2014)

Disclosure Statement:
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE