R V Monteiro, E Brown, J Itani, V S Bona, C Oliveira-Santos, D Donatelli, G M De Souza
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引用次数: 0
Abstract
Bond strength tests are used as predictors of the clinical longevity of dental restorations. However, the aging of bond strength specimens is often simulated with static water storage, even though the saliva flows over teeth and restorations in the mouth. This study investigated the effect of water under static and flow conditions on the bond strength between zirconia and tooth structure using different test designs. Ninety human molars with prepared flat dentin surfaces were randomly divided into three groups according to the test design: Tensile, Shear, and Crown pull-off. The Crown pull-off group received additional standard full crown preparations. Zirconia specimens milled according to the shape of each test design (n=30) were bonded to the tooth structure using resin cement. There were three subgroups (n=10) according to the artificial aging procedure: NA - no aging (24 hours); SW - static water (30 days); FW - water flow (30 days). Bond strength was assessed using a universal testing machine, and the load at failure was recorded. Data were analyzed using two-way ANOVA and Tukey post hoc tests (α=0.05), and the mode of failure was also classified. Two-way ANOVA revealed a significant effect of the test design (p<0.001). However, no effect was observed for the aging procedure (p=0.166). The interaction aging*test design was significant (p=0.019). FW significantly decreased the retention of zirconia crowns to tooth structure (p<0.05) but did not affect the other test design specimens. The mode of failure was adhesive (100%) at the zirconia/cement interface for all specimens and aging conditions, except for Crown pull-off / FW, which were predominantly mixed (60%). FW negatively affected the retention of Y-PSZ crowns to the tooth structure.
粘结强度试验被用作牙科修复体临床寿命的预测指标。然而，即使唾液在口腔中流过牙齿和修复体，也经常用静态水储存来模拟粘结强度样品的老化。本研究采用不同的试验设计，考察了静、流动条件下水对氧化锆与牙齿结构结合强度的影响。90颗牙本质表面平整的人磨牙按试验设计随机分为拉伸组、剪切组和脱冠组。拔冠组接受额外的标准全冠准备。根据每个试验设计的形状（n=30）铣削的氧化锆试件使用树脂水泥与牙齿结构结合。按人工老化程序分为3个亚组（n=10）： NA -未老化（24小时）；SW -静水（30天）；FW -水流（30天）。使用万能试验机评估粘结强度，并记录失效时的载荷。采用双因素方差分析和Tukey事后检验（α=0.05）对数据进行分析，并对失败模式进行分类。双向方差分析显示试验设计的显著影响(p
期刊介绍：
Operative Dentistry is a refereed, international journal published bi-monthly and distributed to subscribers in over 50 countries. In 2012, we printed 84 articles (672 pages). Papers were submitted by authors from 45 countries, in the categories of Clinical Research, Laboratory Research, Clinical Techniques/Case Presentations and Invited Papers, as well as Editorials and Abstracts.
One of the strong points of our journal is that our current publication time for accepted manuscripts is 4 to 6 months from the date of submission. Clinical Techniques/Case Presentations have a very quick turnaround time, which allows for very rapid publication of clinical based concepts. We also provide color for those papers that would benefit from its use.
The journal does not accept any advertising but you will find postings for faculty positions. Additionally, the journal also does not rent, sell or otherwise allow its subscriber list to be used by any other entity
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