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首页> 外文期刊>The Journal of Prosthetic Dentistry >Effect of subgingival depth of implant placement on the dimensional accuracy of the implant impression: an in vitro study.
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Effect of subgingival depth of implant placement on the dimensional accuracy of the implant impression: an in vitro study.

机译：种植体龈下深度对种植体印象尺寸精度的影响：一项体外研究。

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STATEMENT OF PROBLEM: In some instances, an implant needs to be placed deep subgingivally, which may result in a less accurate impression of the implant. PURPOSE.: The purpose of this study was to evaluate the effect of subgingival depth of implant placement on the accuracy of implant impressions. MATERIAL AND METHODS: A stone master model was fabricated with 5 implant analogs (RN synOcta analog), embedded parallel to each other, at the center (E) and the 4 corners (A, B, C, and D). The vertical position of the shoulders of the implants was intentionally different among the implants: A and E were flush with the top surface of the model; B was 2 mm below, and C and D were 4 mm below the surface. The horizontal distances of implants A, B, C, and D from E were measured with a measuring microscope. A cross-shaped metal measuring bar was then fabricated and connected to E, with the arms of the casting designed to be 2 mm above the top surface of the model and incorporating a reference mark. With the measuring bar connected to E, the vertical distances from the apical surface of A, B, C, and D to the measuring reference marks were measured with a digital micrometer. The body of the impression coping for implant D was modified by adding 4 mm of additional impression coping, while standard impression copings were used for all other implants. Open tray impressions were made using medium-body polyether material (Impregum Penta) or a combination of putty and light-body vinyl polysiloxane (VPS) material (Elite HD+) (n=15). Then casts were poured with type IV dental stone. The vertical and horizontal distances of the casts were measured with the methods outlined above for the master model. The distortion values that were determined as differences between the measurements of the master model and those of the casts were collected for statistical analysis. Two-way and 1-way repeated measures ANOVA followed by Tukey's HSD test were performed to compare the distortion values (alpha=.05). RESULTS: For vertical measurements, 2-way repeated measures ANOVA showed no significant depth (P=.36), material (P=.24), or interaction effects (P=.06). However, it showed significant depth effect for horizontal measurements (P=.01). Within the polyether group, 1-way repeated measures ANOVA showed significant differences in horizontal measurements among the implants with different depths (P=.03). The post hoc Tukey's test showed that the impression of 4-mm-deep implants with normal impression copings (C) was significantly less accurate than impressions of 0-mm-deep implants (A) (P=.02). Within the VPS group, there was no significant difference among the implants with different depths (P=.09). CONCLUSIONS: There was no effect of implant depth on the accuracy of the VPS group. However, for the polyether group, the impression of an implant placed 4 mm subgingivally showed a greater horizontal distortion compared to an implant placed more coronally. Adding a 4-mm extension to the retentive part of the impression coping eliminated thisdifference.
机译：问题陈述：在某些情况下，需要将植入物放置在龈下深处，这可能导致植入物的印象较不准确。目的：本研究的目的是评估种植体龈下深度对种植体印模精度的影响。材料和方法：制作了一个石头主模型，在中心（E）和四个角（A，B，C和D）彼此平行地嵌入了5个植入物类似物（RN synOcta类似物）。植入物的肩部垂直位置故意在植入物中有所不同：A和E与模型的顶面齐平; B在表面以下2毫米，C和D在表面以下4毫米。用测量显微镜测量植入物A，B，C和D与E的水平距离。然后，制作了一个十字形的金属测量杆，并将其连接到E，并将铸件的臂设计为在模型顶部表面上方2 mm处并带有参考标记。在将测量杆连接到E的情况下，使用数字千分尺测量从A，B，C和D的根尖表面到测量参考标记的垂直距离。植入物D的压痕顶盖的主体通过增加4 mm的附加压痕顶盖进行了修改，而所有其他植入物均使用了标准的压痕顶盖。使用中型聚醚材料（Impregum Penta）或腻子和轻型乙烯基聚硅氧烷（VPS）材料（Elite HD +）（n = 15）的组合制成开放式托盘印模。然后将铸模倒入IV型牙石。铸件的垂直和水平距离是使用上面针对主模型概述的方法测量的。收集确定为主模型测量值与铸件测量值之间的差异的变形值以进行统计分析。进行了两次和一次重复测量方差分析，然后进行了Tukey的HSD测试，以比较失真值（alpha = .05）。结果：对于垂直测量，两次重复测量方差分析显示没有明显的深度（P = .36），材料（P = .24）或交互作用（P = .06）。但是，它对水平测量显示出明显的深度影响（P = .01）。在聚醚组中，1次重复测量方差分析显示不同深度的植入物之间的水平测量存在显着差异（P = .03）。事后Tukey的测试表明，具有正常压痕顶盖（C）的4毫米深植入物的压印准确度比0毫米深植入物（A）的压印准确度低（P = .02）。在VPS组内，不同深度的植入物之间无显着差异（P = .09）。结论：植入深度对VPS组的准确性没有影响。然而，对于聚醚组，与更冠状放置的植入物相比，龈下放置4mm的植入物的印象显示出更大的水平变形。在压印顶盖的保持部分增加一个4毫米的延伸，可以消除这种差异。

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