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首页> 外文期刊>Journal of Clinical and Diagnostic Research >Influence of Full Veneer Restoration on Fracture Resistance of Three Different Core Materials: An Invitro Study
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Influence of Full Veneer Restoration on Fracture Resistance of Three Different Core Materials: An Invitro Study

机译：完全贴面修复对三种不同芯材抗断裂性的影响：体外研究

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Aims and Objectives: One of the factor which affects the strength of the tooth restored with core material is the property of the material. In clinical situation all such restored teeth are protected by crowns. This study evaluated the strength of different core materials on a compromised tooth structure after restoration with a crown. Materials and Methods: Seventy extracted intact human premolars were collected and mounted within a mould using auto-polymerizing resin. The teeth were divided in-to four groups - A, B, C and D. Each group contained 20 teeth except group A with 10 teeth. All the teeth were prepared for full veneer cast crown. Except for the teeth in group: A) extensive class-I cavities were prepared in the teeth of all the groups and restored with; B) composite resin, 3M EPSE Filtek P60; C) Silver reinforced glass ionomer, SHOFU Hi Dense XP and; (D) Resin reinforced glass ionomer, GC Gold Label light cure GIC. All the teeth were restored with cast-metal alloy and exposed to 1.2 million cycles of cyclic loading in a chewing simulator. Subsequently, the teeth that survived were loaded till fracture in the universal testing machine. Fracture loads and type of fractures were recorded. Results: All the specimens survived cyclic loading. The mean fracture strength of the silver reinforced glass ionomer was greater with and without crown (p<0.001). Statistical analysis for the mean fracture load of each specimen showed significant difference between the groups. Conclusion: Under the condition of this study, core materials when restored with artificial crown had a significant increase in fracture resistance.
机译：目的和目标：影响芯材料修复的牙齿强度的因素之一是材料的性能。在临床情况下，所有这些修复后的牙齿均受冠保护。这项研究评估了用冠修复后受损牙齿结构上不同核心材料的强度。材料和方法：收集七十个完整的人类前磨牙，并使用自动聚合树脂将其安装在模具中。将牙齿分为四组-A，B，C和D。除A组有10颗牙齿外，每组均包含20颗牙齿。所有牙齿均已准备好用于全饰面铸冠。除组中的牙齿外：A）在所有组的牙齿中均准备了广泛的I级蛀牙并进行了修复; B）复合树脂，3M EPSE Filtek P60; C）银增强玻璃离聚物，SHOFU Hi Dense XP和; （D）树脂增强玻璃离聚物，GC金标光固化GIC。所有牙齿均用铸造金属合金修复，并在咀嚼模拟器中承受了120万次循环载荷。随后，在万能试验机中将幸存的牙齿加载直至骨折。记录骨折负荷和骨折类型。结果：所有标本均幸免于循环载荷。有和没有冠的情况下，银增强玻璃离聚物的平均断裂强度更高（p <0.001）。对每个样品的平均断裂载荷进行统计分析表明，两组之间存在显着差异。结论：在本研究的条件下，用人工冠修复的核心材料的抗断裂性显着提高。

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