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腭侧金属边缘高度对单金属烤瓷冠抗折性能的影响

"Effect of Palatal Metal Collar's Height on Fracture Resistance of Single Metal-Ceramic Crowns".

作者信息

Aburaisi Nour, Elbishari Haitham

机构信息

Restorative Dentist, Dr. Sulaiman Al Habib Hospital, Khobar, Saudi Arabia.

Department of Prosthodontics, Hamdan Bin Mohammed College of Dental Medicine (HBMCDM), Mohammed Bin Rashid University of Medicine and Health Sciences (MBRU), Dubai, UAE.

出版信息

Int J Dent. 2022 Oct 7;2022:8290538. doi: 10.1155/2022/8290538. eCollection 2022.

DOI:10.1155/2022/8290538
PMID:36249729
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9568289/
Abstract

OBJECTIVES

The purpose of this study is to evaluate the effect of the palatal metal collar height on the fracture resistance of metal-ceramic crowns.

MATERIALS AND METHODS

A maxillary premolar typodont tooth was prepared and scanned to fabricate 48 metal analogs. The analogs were then scanned to fabricate metal copings divided into 4 groups according to palatal metal collar height as follows; (C0): 0 mm, (C1): 1.0 mm, (C2): 1.5 mm, and (C3): 2.0 mm. After a standard application of pressed ceramic, each crown was cemented onto its corresponding metal tooth analog. The crown-analog assembly was subjected to a sequence of thermal stressing for 5,000 cycles. A universal testing machine applied controlled loads to the crowns until fracture. Examination under a stereomicroscope determined the failure mode. A scanning electron microscope (SEM) was used to examine fracture. Load to failure data was analyzed using ANOVA followed by Tukey HSD ( ≤ 0.05).

RESULTS

ANOVA statistics revealed that groups with a palatal metal collar presented significantly higher failure loads when compared to the collarless group ( < 0.0001). Difference in failure loads between 1.5-mm and 2.0-mm palatal metal collar height were not statistically significant ( = 0.935). There were no significant differences detected among the groups in terms of failure mode.

CONCLUSIONS

The height of the palatal metal collar has an effect on the fracture resistance of the metal-ceramic crowns. . The incorporation of a palatal collar with a predetermined height is essential to reduce the mechanical failure of metal-ceramic crowns.

摘要

目的

本研究旨在评估腭侧金属颈缘高度对金属烤瓷冠抗折性能的影响。

材料与方法

选取一颗上颌前磨牙模型牙进行预备并扫描，制作48个金属代型。然后对代型进行扫描，制作金属基底冠，根据腭侧金属颈缘高度分为4组，如下：（C0）：0毫米，（C1）：1.0毫米，（C2）：1.5毫米，（C3）：2.0毫米。在标准施加压铸陶瓷后，将每个冠粘结到其相应的金属牙代型上。对冠 - 代型组件进行一系列热循环加载5000次。使用万能试验机对冠施加可控载荷直至断裂。在体视显微镜下检查确定失效模式。使用扫描电子显微镜（SEM）检查断裂情况。使用方差分析（ANOVA），然后进行Tukey HSD检验（≤0.05）分析失效载荷数据。

结果

方差分析统计显示，与无颈缘组相比，有腭侧金属颈缘的组具有显著更高的失效载荷（<0.0001）。1.5毫米和2.0毫米腭侧金属颈缘高度之间的失效载荷差异无统计学意义（=0.935）。各组之间在失效模式方面未检测到显著差异。

结论

腭侧金属颈缘高度对金属烤瓷冠的抗折性能有影响。纳入具有预定高度的腭侧颈缘对于减少金属烤瓷冠的机械失效至关重要。

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