剩余牙体高度和桩道空间深度对上颌切牙桩道空间扫描中无线口内扫描仪准确性的影响。

Effects of remaining tooth height and post space depth on the accuracy of a wireless intraoral scanner in post space scanning for maxillary incisor.

作者信息

Zhu Jiakang, Deng Xianfeng, Fu Chunyan, Li Zhongtian, Wang Yake, Huang Cui

机构信息

State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan, 430079, China.

出版信息

J Dent. 2025 Aug 19;162:106050. doi: 10.1016/j.jdent.2025.106050.

DOI:10.1016/j.jdent.2025.106050

PMID:40840779

Abstract

OBJECTIVES

To assess the accuracy of a wireless intraoral scanner (IOS) in obtaining digital impressions of post spaces with different remaining tooth heights (RTHs) and post space depths (PSDs).

METHODS

Sixty standard resin teeth of the right maxillary central incisor were endodontically treated and prepared after being fixed on a maxillary model. The teeth were divided into 2 groups based on the RTH, including 2 and 4 mm. Then each group was divided into 3 subgroups based on the prepared PSD, including 6, 8, and 10 mm (n = 10). All specimens were scanned using Trios 5 and used as test data. Additionally, conventional impressions were taken and subsequently scanned using a laboratory scanner to serve as reference data. The test and reference data were fitted, generating a deviation distribution map of post space. Root mean square (RMS) for 3D and 2D comparisons, along with the proportion of green region (defined as areas within 100 μm deviation in 3D discrepancy), were recorded for accuracy evaluation. 3D RMS values were analyzed using two-way analysis of variance (ANOVA), while one-way ANOVA was applied to the proportions of green regions and 2D RMS values (α = 0.05).

RESULTS

As PSD increased or RTH decreased, the 3D RMS values increased, while the proportion of green region decreased. The 2D RMS values gradually decreased from the cervical to the apical regions in all subgroups. All 3D and 2D RMS values remained below 100 μm, except for the apical region in the RTH-2 mm/PDS-10 mm subgroup. In addition, only the RTH-2 mm/PDS-10 mm subgroup had a proportion of green region below 85 %.

CONCLUSIONS

The accuracy of wireless IOS in scanning post space is significantly influenced by PSD and RTH, with accuracy declining as PSD increases or RTH decreases. Furthermore, all results were within clinically acceptable error values, except for the apical region in the RTH-2 mm/PDS-10 mm subgroup.

CLINICAL SIGNIFICANCE

Trios 5 is effectively suitable for post space scanning when RTH is ≥ 4 mm and PSD is ≤ 10 mm, or when RTH is ≥ 2 mm and PSD is ≤ 8 mm.

摘要

目的

评估无线口内扫描仪（IOS）获取不同剩余牙高度（RTH）和桩道深度（PSD）的桩道数字印模的准确性。

方法

选取60颗右上颌中切牙标准树脂牙，根管治疗后固定于上颌模型上并进行预备。根据RTH将牙齿分为2组，分别为2 mm和4 mm。然后每组根据预备后的PSD分为3个亚组，分别为6、8和10 mm（n = 10）。所有标本均使用Trios 5进行扫描，并用作测试数据。此外，制取传统印模，随后使用实验室扫描仪进行扫描，用作参考数据。将测试数据和参考数据进行拟合，生成桩道偏差分布图。记录三维（3D）和二维（2D）比较的均方根（RMS）以及绿色区域比例（定义为3D差异中偏差在100μm以内的区域），用于准确性评估。3D RMS值采用双向方差分析进行分析，而绿色区域比例和2D RMS值采用单向方差分析（α = 0.05）。

结果

随着PSD增加或RTH减小，3D RMS值增加，而绿色区域比例降低。所有亚组中，2D RMS值从颈部到根尖区域逐渐降低。除RTH为2 mm/PSD为10 mm亚组的根尖区域外，所有3D和2D RMS值均保持在100μm以下。此外，只有RTH为2 mm/PSD为10 mm亚组的绿色区域比例低于85%。