Flexibility and Torsional Strength of ProTaper and ProTaper Universal Rotary Instruments Assessed by Mechanical Tests

被引：28
作者：
Camara, Alexandre Sandri [2 ]
Martins, Renata de Castro [1 ]
Diniz Viana, Ana Cecilia [3 ]
Leonardo, Renato de Toledo [2 ]
Lopes Buono, Vicente Tadeu [1 ]
de Azevedo Bahia, Maria Guiomar [3 ]
机构：
[1] Univ Fed Minas Gerais, Dept Met & Mat Engn, Sch Engn, BR-30160030 Belo Horizonte, MG, Brazil
[2] Univ State Sao Paulo UNESP, Sch Dent Araraquara, Dept Restorat Dent, Araraquara, SP, Brazil
[3] Univ Fed Minas Gerais, Dept Restorat Dent, Fac Dent, BR-30160030 Belo Horizonte, MG, Brazil
来源：
JOURNAL OF ENDODONTICS | 2009年 / 35卷 / 01期
关键词：
Flexibility; NiTi rotary instruments; ProTaper; ProTaper Universal; torsional resistance; TITANIUM ENDODONTIC INSTRUMENTS; BENDING PROPERTIES; EXTRACTED TEETH; CYCLIC FATIGUE; CURVED CANALS; CLINICAL-USE; IN-VITRO; TORQUE; BEHAVIOR; STRESSES;
D O I：
10.1016/j.joen.2008.10.006
中图分类号：
R78 [口腔科学];
学科分类号：
1003 ;
摘要：
The purpose of this study was to assess how the geometric and dimensional changes made on ProTaper Universal (PTU) instruments in comparison with ProTaper (PT) instruments affected their flexibility and torsional strength. Two groups (n = 12) of each type of shaping (S1 and S2) and finishing (F1, F2, and F3) for both PT and PTU instruments were employed. Tip angle, instrument diameter at each millimeter, and cross-sectional area at 3 mm from the tip were the dimensional parameters measured. Flexibility and torsional strength of each instrument (n = 12) were assessed according to specification ISO 3630-1. Data were analyzed using analysis of variance (alpha = 0.05). Flexibility increased for S1 and F1 PTU instruments and decreased for F2 and F3, whereas torsional resistance increased for S2, F2, and F3. Changes in tip angle were accompanied by variation of tip geometry in all instruments. (J Endod 2009;35:113-116)
引用
收藏
页码：113 / 116
页数：4
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