Identification of optimal gingival displacement widths, finish line depths, and preparation designs for digitally scanned single crowns: An in vitro study.

IF 4.3 2区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Journal of Prosthetic Dentistry Pub Date : 2024-10-16 DOI:10.1016/j.prosdent.2024.08.024
Wei-Jyun Ciou, Wei-Hung He
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Abstract

Statement of problem: Digital scans for single crowns have been reported to achieve accuracy similar to that of traditional impressions in certain patients, but criteria for acquiring high-quality scans are lacking.

Purpose: The purpose of this in vitro study was to determine the optimal gingival displacement widths, finish line depths, and preparation designs for single crowns when using intraoral scanners (IOSs) to achieve clinically acceptable and high-quality recordings.

Material and methods: Three different preparation designs of computer-aided design and computer-aided manufacturing (CAD-CAM) polymethyl methacrylate (PMMA) abutments (round shoulder, shoulder, and sloped shoulder) were fitted with titanium sleeves of 4 different thicknesses (0.2 mm, 0.3 mm, 0.4 mm, and 0.5 mm) and magnetically attracted onto the spindle of an electronic spiral micrometer. Occlusal registration material was injected around the abutment to simulate gingival tissue. After setting, the titanium sleeves were removed to create gaps as different gingival displacement widths. The spiral micrometer was rotated to create 5 different finish line depths (supragingival 0.5 mm, equal gingiva, subgingival 0.5 mm, subgingival 1.0 mm, and subgingival 1.5 mm). Two IOSs (CEREC Primescan [PS] and TRIOS 3 [TS]) were used to scan 3 preparation designs with a combination of 4 gingival displacement widths and 5 finish line depths 5 times each (N=600). The files were imported into an engineering software program and superimposed with the corresponding reference scanned files of the original abutments. Tangent distances (TD) and marginal angle differences (MAD) between the testing groups and references were measured and analyzed using the Kolmogorov-Smirnov, Kruskal-Wallis, and Jonckheere-Terpstra tests (α=.05).

Results: A significant linear trend of decreasing TD and MAD with increasing gingival displacement widths and shallower finish line depths was found. Statistically significant differences (P<.05) were found in TD and MAD between different preparation designs at finish line depths that were equigingival and 0.5-mm subgingival.

Conclusions: Clinically acceptable scans generally required a gingival displacement width of at least 0.3 mm and a finish line depth within subgingival 1.0 mm. Both IOSs produced high-quality scans for supragingival finish lines. Both IOSs required at least 0.4-mm gingival displacement width to achieve high-quality scans under equal gingival conditions. Only PS with at least 0.4-mm gingival displacement width was able to achieve high-quality scans for subgingival margins. The accuracy ranking of preparation designs was round shoulder (highest), shoulder, and sloped shoulder (lowest).

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确定数字化扫描单冠的最佳牙龈移位宽度、完成线深度和预备设计:体外研究
目的:本体外研究的目的是确定使用口内扫描仪(IOS)时单冠的最佳牙龈移位宽度、完成线深度和预备设计,以获得临床上可接受的高质量记录:计算机辅助设计和计算机辅助制造(CAD-CAM)聚甲基丙烯酸甲酯(PMMA)基台的三种不同预备设计(圆肩、肩和斜肩)与 4 种不同厚度(0.2 毫米、0.3 毫米、0.4 毫米和 0.5 毫米)的钛套筒相配合,并用磁力吸引到电子螺旋测微计的主轴上。在基台周围注入咬合定位材料以模拟牙龈组织。固位后,取下钛套筒,形成不同牙龈移位宽度的间隙。旋转螺旋测微计以创建 5 种不同的完成线深度(龈上 0.5 毫米、等龈、龈下 0.5 毫米、龈下 1.0 毫米和龈下 1.5 毫米)。使用两种 IOS(CEREC Primescan [PS] 和 TRIOS 3 [TS])扫描 4 种龈位移宽度和 5 种完成线深度组合的 3 种预备设计,每种扫描 5 次(N=600)。这些文件被导入到一个工程软件程序中,并与原始基台的相应参考扫描文件叠加。使用 Kolmogorov-Smirnov、Kruskal-Wallis 和 Jonckheere-Terpstra 检验法(α=.05)测量并分析了测试组和参照物之间的切线距离(TD)和边缘角差异(MAD):随着牙龈移位宽度的增加和终点线深度的变浅,TD 和 MAD 呈明显的线性下降趋势。差异具有统计学意义(PC结论:临床上可接受的扫描一般要求牙龈移位宽度至少为 0.3 毫米,终点线深度在龈下 1.0 毫米以内。两种 IOS 都能获得高质量的龈上完成线扫描。在同等牙龈条件下,两种 IOS 都需要至少 0.4 mm 的牙龈移位宽度才能获得高质量的扫描。只有龈移位宽度至少为 0.4 毫米的 PS 能够实现龈下边缘的高质量扫描。制备设计的准确性排序为圆肩(最高)、肩和斜肩(最低)。
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
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.
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