涉及 1 至 3 枚种植体的下颌义齿抗移位阻力的体外变异测量。

In vitro variation measurement of mandibular denture displacement resistance involving 1 to 3 implants.

机构信息

Graduate student, Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.

Assistant Professor, Gerodontology and Oral Rehabilitation, Tokyo Medical and Dental University, Tokyo, Japan.

出版信息

J Prosthet Dent. 2019 Mar;121(3):492-497. doi: 10.1016/j.prosdent.2018.03.036. Epub 2018 Oct 31.

DOI:10.1016/j.prosdent.2018.03.036

PMID:30391057

Abstract

STATEMENT OF PROBLEM

Single-implant-retained mandibular overdentures (1-IODs) may be an alternative to 2-IOD for maladaptive denture patients giving comparable satisfaction, lower cost, and shorter treatment times. However, studies evaluating the effect of the number of implants on the strain exerted around the implants of IODs using strain-gauge analysis are lacking.

PURPOSE

The purpose of this in vitro study was to evaluate the effect of the number of implants on the strain in an IOD under various loading and dislodging conditions.

MATERIAL AND METHODS

A mandibular IOD with the Locator attachment system (pink nylon inserts) was fabricated on artificial mucosa. Three implant positions recorded the loading: 1-IOD (mid-anterior), 2-IOD (bilateral lateral incisor), and 3-IOD (mid-anterior and bilateral canine) were prepared. Strain gauges attached to the mid-anterior implant replica for the 1-IOD, the left lateral incisor replica for the 2-IOD, and the anterior and left canine replicas for the 3-IOD. Vertical loads of 50 N were applied to the experimental overdenture in the mid-anterior and right molar and left molar regions. Three dislodging tests were performed in 3 different areas: mid-anterior, posterior, and mid-anterior and bilateral molar. Six measurements were made under each loading and dislodging condition for each IOD (N=6). During the calibration test, the resultant strain measured by strain gauge was converted into a lateral force (F) value by using linear regression: F(N)=1.08×strain (με), F(N)=0.192×strain (με), F(N)=0.590×strain (με), F(N)=0.560×strain (με). Statistical analysis was performed by using 1-way ANOVA and the Tukey honestly significant difference test (α=.05).

RESULTS

The 3-IOD demonstrated the significantly highest strain under loading and dislodging conditions (P<.05). The 1-IOD demonstrated the significantly highest strain during right-side loading (P<.05). Upon anterior and left-side loading, no significant difference was noted in strain between the 1-IOD and 2-IOD (P=.413, P=.272). Under dislodging conditions, the 1-IOD exhibited the significantly lowest strain (P<.05).

CONCLUSIONS

Within the limitations of this study, the 3-IOD demonstrated the highest lateral resistance force during load and dislodge testing, whereas the 1-IOD exhibited the lowest.

摘要

问题陈述

对于不适应义齿的患者，单种植体固位下颌覆盖义齿（1-IOD）可能是 2-IOD 的替代方案，可提供相当的满意度、更低的成本和更短的治疗时间。然而，目前缺乏使用应变计分析评估义齿中种植体数量对种植体周围应变影响的研究。

目的

本体外研究的目的是评估在不同加载和脱位条件下，种植体数量对 IOD 中应变的影响。

材料和方法

在人造黏膜上制作带有Locator 附着体系统（粉色尼龙嵌体）的下颌 IOD。记录三种种植体位置的加载情况：1-IOD（中前）、2-IOD（双侧侧切牙）和 3-IOD（中前和双侧尖牙）。将应变计附着到 1-IOD 的中前种植体复制体、2-IOD 的左侧侧切牙复制体和 3-IOD 的前牙和左侧尖牙复制体上。在实验性覆盖义齿的中前和右侧磨牙以及左侧磨牙区域施加 50 N 的垂直载荷。在中前、后和中前及双侧磨牙三个不同区域进行三次脱位测试。每个 IOD 在每种加载和脱位条件下进行 6 次测量（N=6）。在校准测试中，通过线性回归将应变计测量的应变转换为侧向力（F）值：F（N）=1.08×应变（με），F（N）=0.192×应变（με），F（N）=0.590×应变（με），F（N）=0.560×应变（με）。使用单因素方差分析和 Tukey Honestly Significant Difference 检验（α=.05）进行统计分析。