正畸托槽粘结到牙科玻璃陶瓷的临界粘结强度。,Clinical Oral Investigations

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正畸托槽粘结到牙科玻璃陶瓷的临界粘结强度。
Clinical Oral Investigations ( IF 3.1 ) Pub Date : 2019-04-05 , DOI: 10.1007/s00784-019-02881-5
Luís Antônio Di Guida ₁ , Paula Benetti ₁ , Pedro Henrique Corazza ₁ , Alvaro Della Bona ₁

Affiliation

目的评估陶瓷支架和金属支架与二硅酸锂基玻璃陶瓷的临界结合强度（σ）。材料与方法240个陶瓷样品（IPS e-max CAD）随机分布在12个实验组中（n = 20）。在进行以下表面处理之一后，将两个陶瓷托架（单晶BCm；多晶BCp）和金属托架（BM）粘结到玻璃陶瓷样品上：施加HF-氢氟酸60 s; 施加S-硅烷3分钟；HFS-HF后接S；含有磷酸酯单体（MDP）的粘合剂的MDP涂布。使用树脂胶粘剂将所有托槽粘结到处理过的玻璃陶瓷上，然后在剪切粘结强度测试之前将其存储在37°C的水中48小时。光学（OM）和扫描电子（SEM）显微镜检查用于分形分析。使用Kruskal-Wallis和Student-Newman-Keuls（α= 0.05）对数据进行统计分析。结果用HFS或HF处理的结合到玻璃陶瓷上的BCm分别显示最高中值σ值，分别为10.5 MPa和8.5 MPa。相反，结合到用MDP处理的玻璃陶瓷上的BCp表现出最低的中值σ值（0.8 MPa），与其他MDP处理组在统计学上没有差异。结论失效模式是由玻璃陶瓷表面处理决定的，而不是由托架类型决定的。定量（σ值）和定性（断裂模式）数据表明，粘结至玻璃陶瓷的托槽的最小应力为5 MPa，这是全面正畸治疗的下临界粘结强度。临床相关性将托架粘合到玻璃陶瓷上需要微机械固定。

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The critical bond strength of orthodontic brackets bonded to dental glass-ceramics.

OBJECTIVES To evaluate the critical bond strength (σ) of ceramic and metal brackets to a lithium disilicate-based glass-ceramic. MATERIALS AND METHODS Two hundred and forty ceramic specimens (IPS e-max CAD) were randomly distributed in 12 experimental groups (n = 20). Two ceramic brackets (monocrystalline, BCm; and polycrystalline, BCp) and a metal bracket (BM) were bonded to glass-ceramic specimens after one of the following surface treatments: HF-hydrofluoric acid applied for 60 s; S-silane applied for 3 min; HFS-HF followed by S; and MDP-application of an adhesive containing a phosphate monomer (MDP). All brackets were bonded to the treated glass-ceramic using a resin cement, stored in 37 °C water for 48 h before shear bond strength testing. Optical (OM) and scanning electron (SEM) microscopies were used for fractographic analysis. Data was statistically analyzed using Kruskal-Wallis and Student-Newman-Keuls (α = 0.05). RESULTS BCm bonded to glass-ceramic treated with either HFS or HF showed the highest median σ values, respectively, 10.5 MPa and 8.5 MPa. In contrast, the BCp bonded to glass-ceramic treated with MDP showed the lowest median σ value (0.8 MPa), which was not statistically different from other MDP-treated groups. CONCLUSIONS The failure mode was governed by the glass-ceramic surface treatment, not by the bracket type. Quantitative (σ values) and qualitative (fracture mode) data suggested a minimum of 5 MPa for brackets bonded to glass-ceramic, which is the lower critical limit bond strength for a comprehensive orthodontic treatment. CLINICAL RELEVANCE Bonding brackets to glass-ceramic requires micromechanical retention.

更新日期：2019-04-05

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