背景:纤维桩是具有卓越的机械性能、生物相容性和美学效果的非金属牙科修复材料,对于大范围牙齿结构缺损的根管治疗牙具有良好的修复效果。目的:综述纤维桩的分类特性及其在临床修复中的应用进展。方法:应用计算机在中国知网和PubMed数...背景:纤维桩是具有卓越的机械性能、生物相容性和美学效果的非金属牙科修复材料,对于大范围牙齿结构缺损的根管治疗牙具有良好的修复效果。目的:综述纤维桩的分类特性及其在临床修复中的应用进展。方法:应用计算机在中国知网和PubMed数据库中检索有关纤维桩的文献,中文检索词为“纤维桩,分类,牙本质肩领,修复失效,纤维桩拆除,CAD/CAM”,英文检索词为“dental fiber post,classification,ferrule,failure of repair,dental fiber post removal,CAD/CAM”,最终纳入82篇文献进行分析。结果与结论:根据纤维成分的不同,纤维桩可分为碳纤维桩、玻璃纤维桩和石英纤维桩等类型,其中玻璃纤维桩在临床实践中应用最为广泛。纤维桩的固位力和抗力与剩余牙本质肩领紧密相关,而剩余牙本质肩领的数量、高度和厚度通常决定了纤维桩修复适应证的选择。纤维桩的粘接过程具有一定的技术要求,因此,遵循规范化的操作流程显得尤为重要。尽管纤维桩具备良好的机械性能,但在临床使用过程中仍可能出现与根管不密合、松动、脱落、折断或修复失败后的拆除等问题。通过定制个性化纤维桩、选择适当的表面处理方法以及探索新材料和新技术,有望提升纤维桩的临床应用效果。展开更多
Background For esthetic consideration, dentin color post core materials were normally used for all-ceramic crown restorations. However, in some cases, clinicians have to consider combining a full ceramic crown with a ...Background For esthetic consideration, dentin color post core materials were normally used for all-ceramic crown restorations. However, in some cases, clinicians have to consider combining a full ceramic crown with a metal post core. Therefore, this experiment was conducted to test the esthetical possibility of applying cast metal post core in a full ceramic crown restoration.Methods The color of full ceramic crowns on gold and Nickel-Chrome post cores was compared with the color of the same crowns on tooth colored post cores. Different try-in pastes were used to imitate the influence of a composite cementation on the color of different restorative combinations. The majority of patients could not detect any color difference less than △E 1.8 between the two ceramic samples. So, △E 1.8 was taken as the objective evaluative criterion for the evaluation of color matching and patients＇ satisfaction. Results When the Empress 2 crown was combined with the gold alloy post core, the color of the resulting material was similar to that of a glass fiber reinforced resin post core （△E = 0.3）. The gold alloy post core and the try-in paste did not show a perceptible color change in the full ceramic crowns, which indicated that the color of the crowns might not be susceptible to change between lab and clinic as well as during the process of composite cementation. Without an opaque covering the Ni-Cr post core would cause an unacceptable color effect on the crown （△E = 2.0）, but with opaque covering, the color effect became more clinically satisfactory （△E = 1.8）. Conclusions It may be possible to apply a gold alloy post core in the Empress 2 full ceramic crown restoration when necessary. If a non-extractible Ni-Cr post core exists in the root canal, it might be possible to restore the tooth with an Empress 2 crown after covering the labial surface of the core with one layer of opaque resin cement.展开更多
文摘背景:纤维桩是具有卓越的机械性能、生物相容性和美学效果的非金属牙科修复材料,对于大范围牙齿结构缺损的根管治疗牙具有良好的修复效果。目的:综述纤维桩的分类特性及其在临床修复中的应用进展。方法:应用计算机在中国知网和PubMed数据库中检索有关纤维桩的文献,中文检索词为“纤维桩,分类,牙本质肩领,修复失效,纤维桩拆除,CAD/CAM”,英文检索词为“dental fiber post,classification,ferrule,failure of repair,dental fiber post removal,CAD/CAM”,最终纳入82篇文献进行分析。结果与结论:根据纤维成分的不同,纤维桩可分为碳纤维桩、玻璃纤维桩和石英纤维桩等类型,其中玻璃纤维桩在临床实践中应用最为广泛。纤维桩的固位力和抗力与剩余牙本质肩领紧密相关,而剩余牙本质肩领的数量、高度和厚度通常决定了纤维桩修复适应证的选择。纤维桩的粘接过程具有一定的技术要求,因此,遵循规范化的操作流程显得尤为重要。尽管纤维桩具备良好的机械性能,但在临床使用过程中仍可能出现与根管不密合、松动、脱落、折断或修复失败后的拆除等问题。通过定制个性化纤维桩、选择适当的表面处理方法以及探索新材料和新技术,有望提升纤维桩的临床应用效果。
文摘Background For esthetic consideration, dentin color post core materials were normally used for all-ceramic crown restorations. However, in some cases, clinicians have to consider combining a full ceramic crown with a metal post core. Therefore, this experiment was conducted to test the esthetical possibility of applying cast metal post core in a full ceramic crown restoration.Methods The color of full ceramic crowns on gold and Nickel-Chrome post cores was compared with the color of the same crowns on tooth colored post cores. Different try-in pastes were used to imitate the influence of a composite cementation on the color of different restorative combinations. The majority of patients could not detect any color difference less than △E 1.8 between the two ceramic samples. So, △E 1.8 was taken as the objective evaluative criterion for the evaluation of color matching and patients＇ satisfaction. Results When the Empress 2 crown was combined with the gold alloy post core, the color of the resulting material was similar to that of a glass fiber reinforced resin post core （△E = 0.3）. The gold alloy post core and the try-in paste did not show a perceptible color change in the full ceramic crowns, which indicated that the color of the crowns might not be susceptible to change between lab and clinic as well as during the process of composite cementation. Without an opaque covering the Ni-Cr post core would cause an unacceptable color effect on the crown （△E = 2.0）, but with opaque covering, the color effect became more clinically satisfactory （△E = 1.8）. Conclusions It may be possible to apply a gold alloy post core in the Empress 2 full ceramic crown restoration when necessary. If a non-extractible Ni-Cr post core exists in the root canal, it might be possible to restore the tooth with an Empress 2 crown after covering the labial surface of the core with one layer of opaque resin cement.
文摘目的通过建立纯钛桩核冠及纤维桩核冠修复上颌中切牙薄壁残根的三维有限元模型,分析正常咬合情况下两种桩核系统修复上颌中切牙薄壁残根后的应力分布。方法使用Inveon Micro-CT断层扫描技术以21μm最小层间距扫描上颌中切牙切缘至牙根全长,获得横断面DICOM格式数据,利用Inveon Research Workplace图像分析软件进行上颌中切牙外形重建,结合医学逆向工程软件Mimics、Geomagic、Catia建立三维有限元模型。用Ansys Workbench软件对所建模型进行网格划分和模拟加载,利用有限元分析法比较两种桩核系统修复后牙根的应力分布。结果纤维桩核修复组牙根牙本质最大主应力、剪切应力、等效应力峰值均比纯钛桩核修复组减少60%左右,纯钛桩核修复组牙根各区域应力值均大于纤维桩核修复组。同时,两组应力集中区域均出现在牙根唇侧中上1/3,该区域纯钛桩核组应力值达到37.73MPa,为纤维桩核修复组的1.9倍。结论有限元分析提示,上颌中切牙薄壁残根的两种修复方式中,纤维桩树脂桩核冠能更好地避免牙根的应力集中,从而有效降低牙根折裂的概率,可为临床薄壁残根的修复设计提供参考。
