Abstract:
INTRODUCTION:This study evaluated the influence of cervical preflaring on the incidence of root dentin defects after root canal preparation. METHODS:Extracted human maxillary central incisors were selected and allocated to 1 control group and 12 experimental groups (n = 15). Teeth in the control group were left unprepared, whereas the others were prepared using 2 reciprocating single-file systems (Reciproc and WaveOne [WO]), 3 full-sequence rotary systems (ProTaper Universal, ProTaper Next [PTN], and ProFile), and K-files driven by an oscillatory system, with and without cervical preflaring. Roots were then horizontally sectioned at 4, 8, and 12 mm from the apex, stained with 1% methylene blue, and viewed through a stereomicroscope at ×25 magnification. Slices were inspected and the absence/presence of defects (fractures, partial cracks, and craze lines) recorded. Data were analyzed using Kolmogorov-Smirnov and Levene tests followed by the Tukey post hoc test at a significance level of P < .05. RESULTS:No root dentin defects were observed in the control group. WO was associated with a significantly higher number of defects than K-files, ProFile, and PTN (P < .05), but was not significantly different from Reciproc or ProTaper Universal (P > .05). Cervical preflaring significantly reduced the incidence of fractures and other defects in the WO and PTN groups (P < .05). CONCLUSIONS:All instruments caused root dentin defects, regardless of the enlargement or not of the cervical portion. Cervical preflaring was associated with a lower incidence of defects, mainly in root canals prepared with WO and PTN.
journal_name
J Endodjournal_title
Journal of endodonticsauthors
Borges ÁH,Damião MS,Pereira TM,Filho GS,Miranda-Pedro FL,Luiz de Oliveira da Rosa W,Piva E,Guedes OAdoi
10.1016/j.joen.2017.09.021subject
Has Abstractpub_date
2018-02-01 00:00:00pages
286-291issue
2eissn
0099-2399issn
1878-3554pii
S0099-2399(17)31120-2journal_volume
44pub_type
杂志文章abstract:INTRODUCTION:The authors conducted a prospective, randomized, single-blind study to determine the degree of pulpal anesthesia obtained with a primary infiltration of 1 cartridge of articaine in the incisive/mental nerve region of the mandibular second premolar and to determine the anesthetic efficacy of a repeat artica...
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journal_title:Journal of endodontics
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doi:10.1016/j.joen.2008.05.005
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更新日期:2003-08-01 00:00:00
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更新日期:2012-08-01 00:00:00
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journal_title:Journal of endodontics
pub_type: 杂志文章
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更新日期:1997-10-01 00:00:00
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