Effects of liquid scanning-aid material and four variables on the scanning trueness of post space with intraoral scanning

IF 5.6 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of Prosthetic Dentistry Pub Date : 2026-10-01 Epub Date: 2026-08-15 DOI:10.1016/j.prosdent.2026.07.028

Junbin Zou MS, Ke Huang MS, Jinliang Chen MS, Lu Yin PhD

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The combined impact of these variables on scanning trueness remains unclear.</div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to investigate the effect of liquid scanning-aid material and 4 variables on post space scanning trueness with the TRIOS 5 intraoral scanner.</div></div><div>The purpose of this in vitro study was to investigate the effect of liquid scanning-aid material and 4 variables on post space scanning trueness with the TRIOS 5 intraoral scanner.</div><div><h3>Material and methods</h3><div>A standard maxillary dentition model was scanned to obtain data. The right maxillary central incisor was virtually prepared into a residual root post space using a software program, and 4 parameters were set: 2 groups each for post space opening diameter (2.0 mm and 2.5 mm), depth (8.0 mm and 10.0 mm), adjacent tooth status (bilateral adjacent teeth present and absent), and taper (0.04 and 0.08 mm/mm), totaling 16 models. Resin models were fabricated using a high-precision printer. Before and after applying the liquid scanning-aid material, the models were scanned in vitro using the TRIOS 5 scanner (<em>n</em>=10). Trueness was obtained by calculating the average root mean square error (RMSE) through fitting. Two-dimensional cross-sections were constructed to assess the deviation at the bottom of the post space. The Kruskal–Wallis H test was used for univariate analysis, and a mixed-effects model for multifactorial interactions; post hoc pairwise comparisons were performed with the Mann–Whitney <em>U</em> test with Bonferroni correction (α=.05).</div></div><div>A standard maxillary dentition model was scanned to obtain data. The right maxillary central incisor was virtually prepared into a residual root post space using a software program, and 4 parameters were set: 2 groups each for post space opening diameter (2.0 mm and 2.5 mm), depth (8.0 mm and 10.0 mm), adjacent tooth status (bilateral adjacent teeth present and absent), and taper (0.04 and 0.08 mm/mm), totaling 16 models. Resin models were fabricated using a high-precision printer. Before and after applying the liquid scanning-aid material, the models were scanned in vitro using the TRIOS 5 scanner (<em>n</em>=10). Trueness was obtained by calculating the average root mean square error (RMSE) through fitting. Two-dimensional cross-sections were constructed to assess the deviation at the bottom of the post space. The Kruskal–Wallis H test was used for univariate analysis, and a mixed-effects model for multifactorial interactions; post hoc pairwise comparisons were performed with the Mann–Whitney <em>U</em> test with Bonferroni correction (α=.05).</div><div><h3>Results</h3><div>Without the application of liquid scanning-aid material, the median RMSE ranged from 50.0 to 804.5 μm, and the median bottom deviation values ranged from 0.02 to 4.88 mm; after application, the RMSE ranged from 46.0 to 360.0 μm, and the median bottom deviation values ranged from 0.02 to 3.22 mm. Both the liquid scanning-aid material and the 4 post space parameters significantly affected scanning trueness (<em>P</em><.05).</div></div><div>Without the application of liquid scanning-aid material, the median RMSE ranged from 50.0 to 804.5 μm, and the median bottom deviation values ranged from 0.02 to 4.88 mm; after application, the RMSE ranged from 46.0 to 360.0 μm, and the median bottom deviation values ranged from 0.02 to 3.22 mm. Both the liquid scanning-aid material and the 4 post space parameters significantly affected scanning trueness (<em>P</em><.05).</div><div><h3>Conclusions</h3><div>With the obstruction of adjacent teeth, the TRIOS 5 scanner could successfully recognize models with a post space opening diameter of 2.5 mm and depth ≤10 mm. In the absence of the obstruction of adjacent teeth, it could additionally successfully identify models with an opening diameter of 2.0 mm and depth ≤8 mm. Liquid scanning-aid material improved the trueness for narrow and deep post spaces.</div></div><div>With the obstruction of adjacent teeth, the TRIOS 5 scanner could successfully recognize models with a post space opening diameter of 2.5 mm and depth ≤10 mm. In the absence of the obstruction of adjacent teeth, it could additionally successfully identify models with an opening diameter of 2.0 mm and depth ≤8 mm. 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引用次数: 0

Abstract

Statement of problem

Current evidence for post space scanning indications is limited. Past studies have focused primarily on opening diameter and depth, overlooking key clinical factors such as adjacent teeth and taper, as well as potential enhancements like scanning-aid material. The combined impact of these variables on scanning trueness remains unclear.

Purpose

The purpose of this in vitro study was to investigate the effect of liquid scanning-aid material and 4 variables on post space scanning trueness with the TRIOS 5 intraoral scanner.

Material and methods

A standard maxillary dentition model was scanned to obtain data. The right maxillary central incisor was virtually prepared into a residual root post space using a software program, and 4 parameters were set: 2 groups each for post space opening diameter (2.0 mm and 2.5 mm), depth (8.0 mm and 10.0 mm), adjacent tooth status (bilateral adjacent teeth present and absent), and taper (0.04 and 0.08 mm/mm), totaling 16 models. Resin models were fabricated using a high-precision printer. Before and after applying the liquid scanning-aid material, the models were scanned in vitro using the TRIOS 5 scanner (n=10). Trueness was obtained by calculating the average root mean square error (RMSE) through fitting. Two-dimensional cross-sections were constructed to assess the deviation at the bottom of the post space. The Kruskal–Wallis H test was used for univariate analysis, and a mixed-effects model for multifactorial interactions; post hoc pairwise comparisons were performed with the Mann–Whitney U test with Bonferroni correction (α=.05).

Results

Without the application of liquid scanning-aid material, the median RMSE ranged from 50.0 to 804.5 μm, and the median bottom deviation values ranged from 0.02 to 4.88 mm; after application, the RMSE ranged from 46.0 to 360.0 μm, and the median bottom deviation values ranged from 0.02 to 3.22 mm. Both the liquid scanning-aid material and the 4 post space parameters significantly affected scanning trueness (P<.05).

Conclusions

With the obstruction of adjacent teeth, the TRIOS 5 scanner could successfully recognize models with a post space opening diameter of 2.5 mm and depth ≤10 mm. In the absence of the obstruction of adjacent teeth, it could additionally successfully identify models with an opening diameter of 2.0 mm and depth ≤8 mm. Liquid scanning-aid material improved the trueness for narrow and deep post spaces.

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液体助扫材料及四个变量对口腔内扫描柱位扫描正确率的影响。

问题说明：目前空间扫描后适应症的证据有限。过去的研究主要集中在开口直径和深度上，忽视了关键的临床因素，如邻近牙齿和锥度，以及潜在的增强功能，如扫描辅助材料。这些变量对扫描正确率的综合影响尚不清楚。目的：探讨液体助扫材料及4个变量对TRIOS 5口腔内扫描仪后空间扫描正确率的影响。材料和方法：扫描标准上颌牙列模型获取数据。采用软件程序将右上颌中切牙虚拟制备成残根桩空间，设置4个参数：桩空间开口直径（2.0 mm和2.5 mm）、深度（8.0 mm和10.0 mm）、邻牙状态（双侧邻牙有无）和锥度（0.04和0.08 mm/mm）各2组，共16个模型。树脂模型是用高精度打印机制造的。应用液体扫描辅助材料前后，用TRIOS 5扫描仪对模型进行体外扫描（n=10）。通过拟合计算平均均方根误差（RMSE）获得真度。构建了二维截面来评估柱空间底部的偏差。单因素分析采用Kruskal-Wallis H检验，多因素相互作用采用混合效应模型；事后两两比较采用经Bonferroni校正的Mann-Whitney U检验（α= 0.05）。结果：未应用液体助扫材料时，RMSE中位数范围为50.0 ~ 804.5 μm，底部偏差中位数范围为0.02 ~ 4.88 mm；应用后，RMSE范围为46.0 ~ 360.0 μm，中位底偏差值范围为0.02 ~ 3.22 mm。结论：在邻牙阻塞的情况下，TRIOS 5扫描仪可以成功识别柱位开口直径为2.5 mm、深度≤10 mm的模型。在不存在邻牙阻塞的情况下，还能成功识别出开口直径2.0 mm、深度≤8 mm的模型。液体辅助扫描材料提高了窄深柱空间的扫描真实感。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Prosthetic Dentistry 医学-牙科与口腔外科

CiteScore

7.00

自引率

13.00%

发文量

599

审稿时长

69 days

期刊介绍： The Journal of Prosthetic Dentistry is the leading professional journal devoted exclusively to prosthetic and restorative dentistry. The Journal is the official publication for 24 leading U.S. international prosthodontic organizations. The monthly publication features timely, original peer-reviewed articles on the newest techniques, dental materials, and research findings. The Journal serves prosthodontists and dentists in advanced practice, and features color photos that illustrate many step-by-step procedures. The Journal of Prosthetic Dentistry is included in Index Medicus and CINAHL.