Statement of problem

Whether treatment with an implant-supported fixed partial prosthesis (ISFPP) affects the masticatory rhythm in patients with unilateral posterior missing teeth is unclear.

Purpose

The purpose of this prospective clinical study was to determine the change in masticatory rhythm in participants with unilateral posterior missing teeth 3 months after treatment with an ISFPP and to assess whether treatment influenced the stability of the masticatory rhythm.

Material and methods

Thirty participants (mean age 59 years; 17 women) with unilateral posterior missing teeth were treated with 1-, 2-, or 3-unit ISFPPs. Ten healthy individuals (mean age 36 years; 8 women) with a complete natural dentition were included in a control group. In this prospective study, each participant performed 3 masticatory assays (freestyle, unilateral right, and unilateral left) at baseline and at the 3-month follow-up. Each assay comprised 5 trials of 20 cycles masticating pieces of silicone placed in a latex bag. The time needed to complete the 20 masticatory cycles per trial was measured, and the mean masticatory frequency was calculated for each assay. Coefficients of variation were then calculated from the 5 mean values of the masticatory trials. Differences in the data at 3 months and baseline were analyzed by using the Wilcoxon or paired t tests. The control and treated groups were compared by analysis of variance or Mann–Whitney U tests (α=.05).

Results

After 3 months, participants treated with ISFPPs showed an increase of 8.7% in masticatory frequency during freestyle mastication (P<.001) and an 8.0% increase during unilateral mastication on the treated side (P<.01). At baseline, the coefficient of variation of masticatory frequency on the treated side was higher in the ISFPP group than in the control group during unilateral mastication (P=.033). Three months after treatment, there was a significant reduction in the coefficient of variation during unilateral mastication on the treated side of the ISFPP group (P<.001). The treatment group also reached a masticatory frequency similar to that of the control group (75 and 78 cycles per minute, respectively).

Conclusions

Treatment with ISFPPs accelerated the masticatory rhythm of individuals with unilateral posterior missing teeth, who achieve similar rhythms to those with complete natural dentitions. The stability of the masticatory rhythm was also restored, indicating an improvement in masticatory function.

中文翻译：

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单侧种植体支持固定部分假体治疗后 3 个月的咀嚼节律：一项临床研究

问题陈述

种植体支持的固定部分修复体 (ISFPP) 治疗是否会影响单侧后牙缺失患者的咀嚼节律尚不清楚。

目的

这项前瞻性临床研究的目的是确定单侧后牙缺失患者在接受 ISFPP 治疗 3 个月后咀嚼节律的变化，并评估治疗是否影响咀嚼节律的稳定性。

材料与方法

30 名单侧后牙缺失的参与者（平均年龄 59 岁；17 名女性）接受了 1、2 或 3 个单位的 ISFPP 治疗。10 名具有完整自然牙列的健康个体（平均年龄 36 岁；8 名女性）被纳入对照组。在这项前瞻性研究中，每位参与者在基线和 3 个月的随访中进行了 3 次咀嚼试验（自由式、单侧右侧和单侧左侧）。每次试验包括 5 次 20 次循环咀嚼置于乳胶袋中的硅树脂片的试验。测量每次试验完成 20 个咀嚼周期所需的时间，并计算每次试验的平均咀嚼频率。然后根据咀嚼试验的 5 个平均值计算变异系数。使用 Wilcoxon 或配对分析 3 个月和基线数据的差异t测试。通过方差分析或 Mann-Whitney U检验 (α=.05)比较对照组和治疗组。

结果

3 个月后，接受 ISFPP 治疗的参与者在自由式咀嚼期间的咀嚼频率增加了 8.7% ( P <.001)，在治疗侧的单侧咀嚼期间增加了 8.0% ( P <.01)。在基线时，在单侧咀嚼期间，ISFPP 组的治疗侧咀嚼频率的变异系数高于对照组（P = .033）。治疗后三个月，ISFPP 组治疗侧单侧咀嚼时变异系数显着降低（P <.001）。治疗组也达到了与对照组相似的咀嚼频率（分别为每分钟 75 和 78 个循环）。

结论

ISFPPs 治疗加速了单侧后牙缺失患者的咀嚼节律，他们的节律与具有完整自然牙列的人相似。咀嚼节律的稳定性也得到恢复，表明咀嚼功能有所改善。