氧化锆修复体的部分固位体设计考量

Aboushelib Moustafa Nabil, Feilzer Albert J, Kleverlaan Corneliss J, Salameh Ziad

Dental Biomaterials Department, Faculty of Dentistry, Alexandria University, Egypt.

Quintessence Int. 2010 Jan;41(1):41-8.

OBJECTIVE

Bond strength limitations of adhesive zirconia restorations have stood as a barrier against their widespread use. Selective infiltration etching is a new surface treatment that enhances bonding to zirconia-based materials. Beside bond strength, the performance of adhesive zirconia restorations could be affected by other variables. The aim of this study was to evaluate the influence of partial-retainer design on the failure load of selective infiltration-etched zirconia restorations.

METHOD AND MATERIALS

Cantilever selective infiltration-etched zirconia restorations consisting of a pontic, a connector, and a single partial retainer were bonded to resin teeth (Filtek Z250, 3M ESPE). Four designs were tested: lingual, mesiolingual, buccal, and inlay retainers. A full-crown retainer was used as a control. The inner surface of each retainer received selective infiltration-etching surface treatment, and the specimens were bonded using a resin cement (Panavia F 2.0, Kuraray). Half of the cemented restorations were subjected to an artificial aging program (n = 10). The failure load and type of the bonded restorations were evaluated by applying axial load to the pontic. Two-way ANOVA and Tukey S post hoc tests were used to analyze the data (alpha = 0.05).

RESULTS

The partial-retainer design had a significant influence on the failure load of the tested restorations (F = 19.24, P < .001), with the lingual design being the weakest. No significant difference was found between the full-crown, inlay, and buccal retainers. Artificial aging did not influence failure load of the tested restorations. SEM examination revealed that all specimens failed cohesively by fracture of the supporting tooth. The lingual design and the full-crown restorations were associated with complete coronal fracture of the supporting tooth, while minor coronal fractures were observed for the other three partial-retainer designs.

CONCLUSIONS

The design of the partial retainer significantly influences the failure load and type of selective infiltration-etched zirconia restorations. The design of the partial retainer could affect the clinical performance of these restorations.

目的

粘结氧化锆修复体的粘结强度限制一直是其广泛应用的障碍。选择性渗透蚀刻是一种新的表面处理方法，可增强与氧化锆基材料的粘结。除粘结强度外，粘结氧化锆修复体的性能还可能受其他变量影响。本研究的目的是评估部分固位体设计对选择性渗透蚀刻氧化锆修复体破坏载荷的影响。

方法与材料

由桥体、连接体和单个部分固位体组成的悬臂式选择性渗透蚀刻氧化锆修复体粘结到树脂牙（Filtek Z250，3M ESPE）上。测试了四种设计：舌侧、近中舌侧、颊侧和嵌体固位体。使用全冠固位体作为对照。每个固位体的内表面接受选择性渗透蚀刻表面处理，试件使用树脂粘结剂（Panavia F 2.0，可乐丽）粘结。一半粘结修复体进行人工老化程序（n = 10）。通过对桥体施加轴向载荷来评估粘结修复体的破坏载荷和类型。使用双向方差分析和Tukey S事后检验分析数据（α = 0.05）。

结果

部分固位体设计对测试修复体的破坏载荷有显著影响（F = 19.24，P < .001），舌侧设计最弱。全冠、嵌体和颊侧固位体之间未发现显著差异。人工老化未影响测试修复体的破坏载荷。扫描电子显微镜检查显示，所有试件均因支持牙骨折而发生内聚性破坏。舌侧设计和全冠修复体与支持牙的完全冠折相关，而其他三种部分固位体设计观察到轻微冠折。