Abstract:
INTRODUCTION:The introduction of nickel-titanium (NiTi) files into clinical practice has improved the quality of canal shaping, but increasing the curvature of the root canal (or the diameter of the master instrument that prepares the full working length) could result in more transportation, straightening, and aberration of the canal. Nickel-titanium instruments are significantly safer and have an extended cyclic fatigue life when used with a reciprocating movement. The purpose of this study was to compare the shaping ability of FlexMaster NiTi instruments when used in either continuous or reciprocating movements. METHODS:Thirty-two Endo Training Blocks ISO 15, 2% taper, 10-mm radius of curvature, and 70° angle of curvature were prepared, according to the group, with FlexMaster NiTi instruments either in continuous rotation or in reciprocating (60° clockwise, 40° counterclockwise) movement. Preoperative and postoperative images of the simulated canals were taken under standardized conditions. The preoperative and postoperative images were combined exactly. The amount of resin removed was determined both for the inner (convex) and the outer (concave) sides of the curvature at 10 different points. RESULTS:In the most apical third of the canal, the Continuous group produced the largest enlargement of the canal as compared with the Reciprocating group (P < .05). In the apical third, the Continuous group displayed significantly greater enlargement of the canal at the external side. CONCLUSIONS:The shaping of simulated canals is more centered by using a reciprocating motion when compared with continuous rotation, but the reciprocating motion could be more time-consuming.
journal_name
J Endodjournal_title
Journal of endodonticsauthors
Franco V,Fabiani C,Taschieri S,Malentacca A,Bortolin M,Del Fabbro Mdoi
10.1016/j.joen.2011.06.030subject
Has Abstractpub_date
2011-10-01 00:00:00pages
1398-401issue
10eissn
0099-2399issn
1878-3554pii
S0099-2399(11)00815-6journal_volume
37pub_type
杂志文章abstract::The aim of this study was to investigate fracture patterns occurring when a human upper central incisor is subjected to impact loadings at various angles. A two-dimensional finite element (FE) model of the maxillary incisor and surrounding tissues was established. The structural damping factor for the tooth was then c...
journal_title:Journal of endodontics
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journal_title:Journal of endodontics
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journal_title:Journal of endodontics
pub_type: 杂志文章,随机对照试验
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更新日期:2011-06-01 00:00:00