This study aimed to present a new method based on numeric calculus to provide data on the theoretical volume ratio of voids when using the cold lateral compaction technique in canals with various diameters and tapers....This study aimed to present a new method based on numeric calculus to provide data on the theoretical volume ratio of voids when using the cold lateral compaction technique in canals with various diameters and tapers. Twenty-one simulated mathematical root canal models were created with different tapers and sizes of apical diameter, and were filled with defined sizes of standardized accessory gutta-percha cones. The areas of each master and accessory gutta-percha cone as well as the depth of their insertion into the canals were determined mathematically in Microsoft Excel. When the first accessory gutta-percha cone had been positioned, the residual area of void was measured. The areas of the residual voids were then measured repeatedly upon insertion of additional accessary cones until no more could be inserted in the canal. The volume ratio of voids was calculated through measurement of the volume of the root canal and mass of gutta-percha cones. The theoretical volume ratio of voids was influenced by the taper of canal, the size of apical preparation and the size of accessory gutta-percha cones. Greater apical preparation size and larger taper together with the use of smaller accessory cones reduced the volume ratio of voids in the apical third. The mathematical model provided a precise method to determine the theoretical volume ratio of voids in root-filled canals when using cold lateral compaction.展开更多
目的:评价Guttaflow根管充填系统与热牙胶连续波技术对C型根管的充填效果。方法:将60枚具备C型根管的下颌后牙随机分为两组,每组30个样本。在对样本进行根管预备后,组1采用Gut-taflow根管充填系统充填,组2采用热牙胶连续波充填,分别对...目的:评价Guttaflow根管充填系统与热牙胶连续波技术对C型根管的充填效果。方法:将60枚具备C型根管的下颌后牙随机分为两组,每组30个样本。在对样本进行根管预备后,组1采用Gut-taflow根管充填系统充填,组2采用热牙胶连续波充填,分别对已经充填的离体牙在根方、根管中部、冠方进行水平方向切片,采用图像分析软件Image Plus Pro 6.0计算横截面中牙胶充填面积(GPFA),比较不同充填方式GPFA以及相同根管分类不同充填方法GPFA的差异。结果:Guttaflow组在冠、中、根方1/3的根管充填效果较热牙胶连续波技术好,差异均有统计学意义(P均<0.05);在Melton根管分类下,Guttaflow技术在C3、C4类型的C型根管中较热牙胶连续波技术具有更好的充填效果(P<0.05),但在C2类型根管中,Guttaflow与热牙胶连续波技术差异无统计学意义(P>0.05)。结论:Guttaflow根管充填系统对于C型根管具有良好的充填效果。展开更多
基金supported by the National Natural Science Foundation of China(No.81200781)
文摘This study aimed to present a new method based on numeric calculus to provide data on the theoretical volume ratio of voids when using the cold lateral compaction technique in canals with various diameters and tapers. Twenty-one simulated mathematical root canal models were created with different tapers and sizes of apical diameter, and were filled with defined sizes of standardized accessory gutta-percha cones. The areas of each master and accessory gutta-percha cone as well as the depth of their insertion into the canals were determined mathematically in Microsoft Excel. When the first accessory gutta-percha cone had been positioned, the residual area of void was measured. The areas of the residual voids were then measured repeatedly upon insertion of additional accessary cones until no more could be inserted in the canal. The volume ratio of voids was calculated through measurement of the volume of the root canal and mass of gutta-percha cones. The theoretical volume ratio of voids was influenced by the taper of canal, the size of apical preparation and the size of accessory gutta-percha cones. Greater apical preparation size and larger taper together with the use of smaller accessory cones reduced the volume ratio of voids in the apical third. The mathematical model provided a precise method to determine the theoretical volume ratio of voids in root-filled canals when using cold lateral compaction.
文摘目的:评价Guttaflow根管充填系统与热牙胶连续波技术对C型根管的充填效果。方法:将60枚具备C型根管的下颌后牙随机分为两组,每组30个样本。在对样本进行根管预备后,组1采用Gut-taflow根管充填系统充填,组2采用热牙胶连续波充填,分别对已经充填的离体牙在根方、根管中部、冠方进行水平方向切片,采用图像分析软件Image Plus Pro 6.0计算横截面中牙胶充填面积(GPFA),比较不同充填方式GPFA以及相同根管分类不同充填方法GPFA的差异。结果:Guttaflow组在冠、中、根方1/3的根管充填效果较热牙胶连续波技术好,差异均有统计学意义(P均<0.05);在Melton根管分类下,Guttaflow技术在C3、C4类型的C型根管中较热牙胶连续波技术具有更好的充填效果(P<0.05),但在C2类型根管中,Guttaflow与热牙胶连续波技术差异无统计学意义(P>0.05)。结论:Guttaflow根管充填系统对于C型根管具有良好的充填效果。
