Statement of problem

How the masticatory function of complete denture wearers is influenced by the positioning and occlusion of posterior teeth or by the presence of a single mandibular implant is unclear.

Purpose

The purpose of this randomized crossover clinical trial was to evaluate the masticatory efficiency of wearers of bimaxillary complete dentures and of wearers of maxillary complete denture and single implant-retained mandibular overdentures, both with bilateral balanced occlusion and lingualized occlusion.

Material and methods

Participants received 2 sets of complete dentures with interchangeable teeth in the mandibular prosthesis to allow a change in the occlusion scheme. Subsequently, 1 implant was placed in the mandibular symphysis region, and the mandibular complete dentures were converted to overdentures. The masticatory efficiency was measured by the sieve method for both occlusal schemes.

Results

Repeated measures ANOVA showed no statistically significant difference in the masticatory efficiency with the 2 occlusal schemes for conventional complete dentures (P=.707) or overdentures (P=.407). When comparing the type of prosthesis, statistical differences were found for masticatory efficiency (P=.012), with improved mastication for the overdentures.

Conclusions

A mandibular single implant improved the masticatory efficiency of patients with complete dentures, but the occlusal scheme did not influence this factor.

中文翻译：

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不同咬合方案的全口义齿和单种植体固位下颌覆盖义齿佩戴者的咀嚼效率：一项随机临床试验

问题陈述

全口义齿佩戴者的咀嚼功能如何受到后牙的定位和咬合或单个下颌种植体的影响尚不清楚。

目的

本随机交叉临床试验的目的是评估双颌全口义齿佩戴者以及上颌全口义齿和单种植体固位下颌覆盖义齿佩戴者的咀嚼效率，均采用双侧平衡咬合和舌化咬合。

材料与方法

参与者接受了 2 套全口义齿，下颌假体中的牙齿可互换，以允许改变咬合方案。随后，在下颌联合区域植入 1 个种植体，并将下颌全口义齿转换为覆盖义齿。两种咬合方案均通过筛法测量咀嚼效率。

结果

重复测量方差分析显示，传统全口义齿 ( P =.707) 或覆盖义齿 ( P =.407)的 2 种咬合方案在咀嚼效率方面没有统计学上的显着差异。比较修复体的类型时，发现咀嚼效率存在统计学差异 ( P =.012)，覆盖义齿的咀嚼能力得到改善。

结论

下颌单颗种植体提高了全口义齿患者的咀嚼效率，但咬合方案并未影响该因素。