全结晶玻璃基CAD/CAM陶瓷的疲劳性能。

IF 5.5 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of dentistry Pub Date : 2025-09-19 DOI:10.1016/j.jdent.2025.106118

Shujiang Chen , Chun Yin Kam , Yun Hong Lee , Xuedong Bai , Yanning Chen , James Kit Hon Tsoi

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引用次数: 0

摘要

目的：本研究旨在研究新型全结晶二硅酸锂CAD/CAM陶瓷与玻璃基CAD/CAM材料的疲劳行为。方法：研究了完全结晶的二硅酸锂（Initial LiSi Block; LiSi），以及完全烧结的氧化锆增强硅酸锂（ZLS）（Celtra DUO； DUO）和白晶石基玻璃陶瓷（Empress CAD； EMP）。通过三点弯曲测试抗弯强度和抗弯模量（n = 15）。在粘连到牙本质模拟基台（30%玻璃纤维增强聚酰胺-尼龙6,6；RPN）后，CAD/ cam制造的解剖上颌前磨牙冠进行湿循环阶应力加载直到断裂（初始载荷500 N，步长100 N，每步10万次，20 Hz频率；N = 12）。经数据正态性和方差齐性检验后，采用单因素方差分析、Kruskal-Wallis检验和中位秩威布尔分析进行统计学分析，生存率采用Mantel-Cox Log-Rank检验（α = 0.05,95% CI）。结果：三种玻璃基陶瓷的抗弯强度差异有统计学意义（p < 0.001），而抗弯模量差异无统计学意义（p = 0.630）。各组疲劳失效载荷（FFL）和失效循环次数（NCF）差异无统计学意义（p = 0.106和0.061），但LISI的NCF显著高于EMP （p = 0.049）。尽管存活概率相似（p = 0.165），LISI的FFL和结构可靠性最高，相对标准偏差（RSD）最低。意义：三种椅子边玻璃基CAD/CAM材料在单单元修复中表现出令人满意的疲劳性能，其中LISI在疲劳载荷下表现出更高的可靠性。

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Fatigue behaviour of fully crystallised glass-based CAD/CAM ceramics

Objective

This study aimed to investigate the fatigue behaviour of a novel fully crystallised lithium disilicate CAD/CAM ceramic in comparison to glass-based CAD/CAM materials.

Methods

The fully crystallised lithium disilicate (Initial LiSi Block; LISI), along with a fully sintered zirconia-containing lithium silicate (ZLS) (Celtra DUO; DUO) and a leucite-based glass ceramic (Empress CAD; EMP), were investigated. Flexural strength and flexural modulus (n = 15) were tested via three-point bending. After adhesively luting to dentine analogue abutments (30 % glass fibre reinforced polyamide-nylon 6,6; RPN), CAD/CAM-fabricated anatomic maxillary premolar crowns were subjected to wet cyclic step-stress loading until fracture (500 N initial load, 100 N step size, 100,000 cycles per step, 20 Hz frequency; n = 12). After testing the data normality and homogeneity of variance, statistical analysis was performed using one-way ANOVA, Kruskal-Wallis test, and median-rank Weibull analysis, with survival probability assessed by Mantel-Cox Log-Rank test (α = 0.05, 95 % CI).

Results

Significant difference in flexural strength was detected among three glass-based ceramics (p < 0.001), while no significant difference was observed in flexural modulus (p = 0.630). No significant difference was found in the fatigue failure load (FFL) and number of cycles until failure (NCF) among groups (p = 0.106 and 0.061, respectively), except for the significantly higher NCF of LISI than EMP (p = 0.049). Despite similar survival probabilities (p = 0.165), LISI showed the highest FFL and structural reliability, and the lowest relative standard deviation (RSD).

Significance

Three chairside glass-based CAD/CAM materials presented satisfactory fatigue properties for single-unit restorations, with LISI showing higher reliability under fatigue loading.

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来源期刊

Journal of dentistry 医学-牙科与口腔外科

CiteScore

7.30

自引率

11.40%

发文量

349

审稿时长

35 days

期刊介绍： The Journal of Dentistry has an open access mirror journal The Journal of Dentistry: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The Journal of Dentistry is the leading international dental journal within the field of Restorative Dentistry. Placing an emphasis on publishing novel and high-quality research papers, the Journal aims to influence the practice of dentistry at clinician, research, industry and policy-maker level on an international basis. Topics covered include the management of dental disease, periodontology, endodontology, operative dentistry, fixed and removable prosthodontics, dental biomaterials science, long-term clinical trials including epidemiology and oral health, technology transfer of new scientific instrumentation or procedures, as well as clinically relevant oral biology and translational research. The Journal of Dentistry will publish original scientific research papers including short communications. It is also interested in publishing review articles and leaders in themed areas which will be linked to new scientific research. Conference proceedings are also welcome and expressions of interest should be communicated to the Editor.