Abstract:
AIM:To evaluate the effect of rotational speed and the angle and radius of curvature of root canals on the fracture of two types of nickel-titanium rotary instruments: K3 and ProTaper. METHODOLOGY:A total of 240 root canals of extracted human maxillary and mandibular molars were divided into two groups of 120, according to the angle of the canal curvature (group A: <30 degrees, group B: >30 degrees). Each group was then divided into two subgroups of 60 canals in order to perform instrumentation using K3 and ProTaper rotary instruments at three different rotational speeds: 150, 250 and 350 r.p.m. (20 canals at each rotational speed). Each instrument was used a maximum of 20 times and at one rotational speed only. The angle and radius of canal curvature were measured in the only group in which fractures actually took place (group B). RESULTS:There were a total of 22 instrument fractures; all of these occurred in canals with curves >30 degree. In a multivariate analysis, it was demonstrated that the files used at a rotational speed of 350 r.p.m. were more likely to fracture than those used at 250 r.p.m. (OR: 1113.88; 95% CI: 2.36-526420.05) and than those used at 150 r.p.m. (OR: 13531.33; 95% CI: 5.37-34120254.00). A decrease in the angle of curvature of the canal also significantly reduced the likelihood of fracture (OR: 0.2083; 95% CI: 0.068-0.6502). These relationships remained significant after being adjusted for the potential interactions between the remaining variables. No significant differences were found between the files or the radii of the canals. CONCLUSIONS:Instrument fracture was associated with rotational speed and the angle of curvature of the canal.
journal_name
Int Endod Jjournal_title
International endodontic journalauthors
Martín B,Zelada G,Varela P,Bahillo JG,Magán F,Ahn S,Rodríguez Cdoi
10.1046/j.1365-2591.2003.00630.xkeywords:
subject
Has Abstractpub_date
2003-04-01 00:00:00pages
262-6issue
4eissn
0143-2885issn
1365-2591pii
630journal_volume
36pub_type
杂志文章abstract:AIM:The apical sealing ability of three different endodontic sealers was evaluated in extracted teeth using dye penetration. METHODOLOGY:The root canals of 99 extracted human maxillary central incisors were prepared sequentially 2 mm beyond the apical foramen with a size 55 Nitiflex file. The teeth were divided into t...
journal_title:International endodontic journal
pub_type: 临床试验,杂志文章,随机对照试验
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更新日期:2000-01-01 00:00:00
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journal_title:International endodontic journal
pub_type: 临床试验,杂志文章,随机对照试验
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更新日期:2019-11-01 00:00:00
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更新日期:2006-07-01 00:00:00
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doi:10.1111/j.1365-2591.1994.tb00280.x
更新日期:1994-11-01 00:00:00
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doi:10.1111/iej.13456
更新日期:2021-01-26 00:00:00
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pub_type: 杂志文章
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更新日期:1992-07-01 00:00:00
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journal_title:International endodontic journal
pub_type: 杂志文章,评审
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更新日期:2009-04-01 00:00:00
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pub_type: 杂志文章
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