Dankkoub Alireza, Shooshtari Zahra, Namdar Seyedeh Fatemeh, Sadeghnezhad Pegah, Soltaninezhad Pouria, Majidinia Sara
Department of Prosthodontics, School of Dentistry,Mashhad University of Medical Sciences, Mashhad, Iran.
Dental Research Center, Mashhad Dental School, Mashhad University of Medical Sciences, Mashhad, Iran.
J Dent Res Dent Clin Dent Prospects. 2025 Jun 30;19(2):104-109. doi: 10.34172/joddd.025.41878. eCollection 2025 Jun.
This in vitro study compared the wear response of natural enamel when opposed to hybrid and conventional dental ceramic materials under both abrasive and erosive conditions.
Eighty enamel specimens were prepared from bovine central incisors and divided into five groups based on the antagonist material used. Each group consisted of 16 specimens, with antagonists fabricated from four different aesthetic CAD/CAM block materials: VITA Enamic (VE), Lava Ultimate (LU), Lava Plus (LP), and VITA Mark II (VM), alongside natural enamel as a control. The specimens underwent 100000 wear cycles (49 N/2 Hz) under non-erosive and erosive conditions, simulating clinical scenarios. Enamel wear was quantified through weight loss measurements. Statistical analysis was conducted using two-way ANOVA and post hoc Games-Howell test, with a significance level set at α=0.05.
The study demonstrated significant variations in enamel wear when opposed to different dental ceramic materials under both erosive and non-erosive conditions (<0.001 for both). The VM group exhibited the highest mean enamel wear across varying pH conditions (=0.0104 and =0.0900). Statistically significant differences in enamel weight loss were observed among all five groups under non-erosive conditions. However, erosive wear rates differed significantly between nearly all groups, except for comparisons between LU and VE (=0.271) and LP and VM (=0.180). Notably, mean enamel wear values were higher when specimens were exposed to acetic acid compared to non-erosive conditions (<0.001 for all groups).
Despite advancements in hybrid ceramic manufacturing, natural enamel wear remains significantly lower when opposed to these materials compared to conventional ceramics. Hybrid ceramics exhibited reduced wear potential compared to feldspathic and zirconia ceramics, underscoring their clinical relevance.
本体外研究比较了天然牙釉质在磨损和侵蚀条件下与混合及传统牙科陶瓷材料相对时的磨损反应。
从牛的中切牙制备80个牙釉质标本，并根据所使用的对抗材料分为五组。每组由16个标本组成，对抗材料由四种不同的美学CAD/CAM块状材料制成：维他灵瓷（VE）、Lava Ultimate（LU）、Lava Plus（LP）和维他瓷Ⅱ型（VM），同时以天然牙釉质作为对照。标本在非侵蚀性和侵蚀性条件下进行100000次磨损循环（49 N/2 Hz），模拟临床情况。通过失重测量来量化牙釉质磨损。使用双向方差分析和事后Games-Howell检验进行统计分析，显著性水平设定为α=0.05。
该研究表明，在侵蚀性和非侵蚀性条件下，牙釉质与不同牙科陶瓷材料相对时的磨损存在显著差异（两者均<0.001）。VM组在不同pH条件下的平均牙釉质磨损最高（分别为0.0104和0.0900）。在非侵蚀性条件下，所有五组之间的牙釉质失重存在统计学显著差异。然而，除了LU和VE之间（P=0.271）以及LP和VM之间（P=0.180）的比较外，几乎所有组之间侵蚀性磨损率的差异均具有统计学意义。值得注意的是，与非侵蚀性条件相比，当标本暴露于乙酸时，平均牙釉质磨损值更高（所有组均<0.001）。
尽管混合陶瓷制造有了进步，但与传统陶瓷相比，天然牙釉质与这些材料相对时的磨损仍然显著更低。与长石质和氧化锆陶瓷相比，混合陶瓷的磨损潜力降低，凸显了它们的临床相关性。
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