SEM observations of nickel-titanium rotary endodontic instruments that fractured during clinical use

被引:170
作者
Alapati, SB
Brantley, WA
Svec, TA
Powers, JM
Nusstein, JM
Daehn, GS
机构
[1] Ohio State Univ, Coll Dent, Sect Restorat & Prosthet Dent, Columbus, OH 43218 USA
[2] Ohio State Univ, Coll Dent, Sect Oral Biol, Columbus, OH 43218 USA
[3] Ohio State Univ, Coll Dent, Sect Endodont, Columbus, OH 43218 USA
[4] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43218 USA
[5] Univ Texas, Dept Restorat Dent & Biomat, Dent Branch, Houston, TX 77225 USA
[6] Univ Texas, Div Endodont, Dent Branch, Houston, TX 77225 USA
关键词
D O I
10.1097/01.DON.0000132301.87637.4A
中图分类号
R78 [口腔科学];
学科分类号
1003 ;
摘要
Numerous discarded ProFile GT, ProFile, and ProTaper nickel-titanium rotary instruments obtained from two graduate endodontic clinics were examined by scanning electron microscopy. These instruments had an unknown history of clinical use and had fractured or experienced considerable permanent torsional deformation without complete separation. The failure processes generally exhibited substantial ductile character, evidenced by a dimpled rupture fracture surface. Crack propagation at grain boundaries and cleavage surfaces indicative of transgranular fracture were observed for some specimens. It appeared that oxide particles from the manufacturing process served as nucleating sites for the microvoids, leading to dimpled rupture. A previously unreported fracture mode also was observed, in which crack propagation, approximately parallel to the local flute orientation, connected pitted regions on the surface. Combining present and previous scanning electron microscopy observations of clinically failed instruments, suggestions are offered for improving their fracture resistance.
引用
收藏
页码:40 / 43
页数:4
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