Fracture resistance of implant-supported screw-retained zirconia-based molar restorations
Fracture resistance of implant-supported screw-retained zirconia-based molar restorations
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DOI：
10.1111/clr.12926
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发表时间：
2017-09-01
影响因子：
4.3
通讯作者：
Matsumura, Hideo
中科院分区：
文献类型：
--
作者：
Honda, Junichi;Komine, Futoshi;Matsumura, Hideo
目的：本研究的目的是探讨螺钉固位氧化锆基磨牙修复体的断裂载荷材料和方法在牙种植体上制作44个螺钉固位氧化锆基磨牙修复体，并分为4组（n=11）：陶瓷层状氧化锆基陶瓷（PLZ）、间接复合层状氧化锆基陶瓷（ILZ）、金属-陶瓷（MC）和整体氧化锆陶瓷（MONO）。PLZ、ILZ和MONO组中的氧化锆基牙用双聚合树脂材料粘接在种植体基台上。用钛螺钉将所有的骨固定在种植体上，并进行抗断裂试验。结果MONO组的平均抗折强度（7.54 kN）显著高于其他组，PLZ组（1.96 kN）、ILZ组（1.80 kN）和MC组（1.45 kN）之间无显著性差异（P>0.05）。对于PLZ、ILZ和MC组，所有样本均在分层材料内断裂。与此相反，骨折模式为MONO组是完全骨折的prefications.ConclusionsAll prefications经受住了咀嚼力。螺钉固位种植体支持的整体氧化锆冠的断裂载荷明显高于螺钉固位双层冠。对于螺钉固定的双层氧化锆基复合材料，ILZ复合材料的抗断裂性与PLZ复合材料和MC复合材料相当。
ObjectivesThe objective of this invitro study was to investigate fracture loads of screw-retained zirconia-based molar restorations (hybrid abutment crown) fabricated with different restorative materials and designs.Material and methodsForty-four screw-retained zirconia-based molar restorations were fabricated on dental implants and divided into four groups (n=11): porcelain-layered zirconia-based restorations (PLZ), indirect composite-layered zirconia-based restorations (ILZ), metal-ceramic restorations (MC), and monolithic zirconia restorations (MONO). The zirconia-based restorations in the PLZ, ILZ, and MONO groups were adhesively bonded on implant abutments with a dual-polymerized resin material. All restorations were tightened on implant bodies with titanium screws and were tested for fracture resistance. The Kruskal-Wallis test and Steel-Dwass test were used to evaluate differences in fracture loads (=0.05).ResultsAs compared with the other groups, the MONO specimens had a significantly higher mean fracture resistance (7.54 kN); no significant differences were found among the PLZ (1.96 kN), ILZ (1.80 kN), and MC (1.45 kN) groups (P>0.05). For the PLZ, ILZ, and MC groups, all specimens fractured within the layering materials. In contrast, the fracture mode for the MONO group was complete fracture of the restorations.ConclusionsAll restorations withstood the masticatory forces. Fracture loads were significantly higher for screw-retained implant-supported monolithic zirconia restorations than for screw-retained bilayered restorations. For the screw-retained bilayered zirconia-based restorations, the fracture resistance of ILZ restorations was comparable to that of PLZ restorations and MC restorations.