Fracture Resistance of Endocrowns Manufactured with Different Preparation Designs and Different CAD/CAM Materials

Abdulghafor M. Naji, Manal Abo-madina, Mahy Hassouna
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Abstract

Statement of problem: Different preparation designs and materials used for endocrown manufacturing are important factors for the success of the restoration, but the studies that evaluated the effect of the designs and materials on the fracture resistance are inadequate. Purpose: This study evaluated the fracture resistance of endocrowns with two preparation designs and manufactured with two CAD/CAM ceramic materials. Materials and Methods: Forty endodontically treated maxillary 1 molar teeth were prepared to receive endocrown restorations and divided into two main groups according to the preparation designs: Group B (n=20) endocrowns with butt joint design; Group F (n=20) endocrowns with ferrule design. The main groups were subdivided into two subgroups according to the CAD/CAM material used: Subgroup E (n=20) endocrowns manufactured from lithium disilicate glass ceramic (LD) (IPS e.max CAD, Ivoclar-Vivadent, Liechtenstein); Subgroup C (n=20) endocrowns manufactured from hybrid nano-ceramic (HN) (Cerasmart 270, GC, Japan). The endocrown restoration were cemented to the prepared teeth using dual cured self-adhesive resin cement. The specimens were subjected to thermal aging up to 10.000 cycles in a thermocycling paths with 5C and 55C. All specimens were subjected to a compressive force until fracture occur by using universal testing machine. The maximum compressive force was recorded for all specimen; then the failure modes were examined using scanning electron microscope SEM. Results: The mean value of fracture resistance of BC group was statistically and significantly higher than the other tested groups; (BC group, 4361.01±554.32 N) and the lowest mean value was recorded with FE group (2693.04±638.69 N). B Group showed significant higher fracture resistance than F Group (B group, 3707.09±1156.06 N; F group, 2724.34±601.96 N). C subgroup showed significant higher fracture resistance compared to that of E subgroup (C subgroups, 3558.33±995.92 N; E subgroups, 2873.10±983.95 N). All groups showed a high rate of catastrophic failures but at loads greater than normal maximum masticatory forces. Conclusions: Butt joint design endocrowns exhibited significantly higher fracture resistance than ferrule design endocrowns. Hybrid nano-ceramic endocrowns showed higher fracture resistance than lithium disilicate endocrowns. Endocrown showed a high percent of irreparable failure mode but at loads larger than normal masticatory function.
不同制备设计及不同CAD/CAM材料的内冠抗断裂性能研究
问题陈述:内冠制造的不同制备设计和材料是修复成功的重要因素,但评估设计和材料对抗断裂性影响的研究不足。目的:研究两种制备方案和两种CAD/CAM陶瓷材料制备的内冠抗折性能。材料与方法:制备40颗经根管治疗的上颌1磨牙进行内冠修复,根据制备设计分为两组:B组(n=20)采用对接设计的内冠;F组(n=20)采用卡箍设计。根据所使用的CAD/CAM材料将主要组细分为两个亚组:E亚组(n=20)由二硅酸锂玻璃陶瓷(LD)制成的内冠(IPS e.max CAD, Ivoclar-Vivadent,列支敦士登);亚组C (n=20)由混合纳米陶瓷(HN)制成的内冠(Cerasmart 270, GC, Japan)。采用双固化自粘树脂胶粘剂将内冠修复体粘接在预备牙体上。试样在5C和55℃的热循环路径下进行了高达10000次的热老化。在万能试验机上,所有试样均承受压缩力直至断裂。记录所有试件的最大压缩力;然后用扫描电子显微镜(SEM)观察其失效模式。结果:BC组骨折阻力平均值高于其他各组,差异有统计学意义;(BC组,4361.01±554.32 N), FE组最低(2693.04±638.69 N), B组抗骨折能力显著高于F组(B组,3707.09±1156.06 N;F组,2724.34±601.96 N)。C亚组抗骨折能力显著高于E亚组(C亚组,3558.33±995.92 N;E亚组,2873.10±983.95 N)。所有组均表现出较高的灾难性失效率,但在负载大于正常最大咀嚼力时。结论:对接设计的内冠比卡箍设计的内冠具有更高的抗骨折性。复合纳米陶瓷内冠的抗断裂性能优于二硅酸锂内冠。在负荷大于正常咀嚼功能的情况下,内冠出现不可修复性损伤的比例较高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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