Relationship between flexibility and physical, chemical, and geometric characteristics of rotary nickel-titanium instruments

被引：41

作者：

Diniz Viana, Ana Cecilia ^{[3
]}

Craveiro de Melo, Marta Chaves ^{[2
]}

de Azevedo Bahia, Maria Guiomar ^{[3
]}

Lopes Buono, Vicente Tadeu ^{[1
]}

机构：

[1] Univ Fed Minas Gerais, Dept Met & Mat Engn, Sch Engn, BR-31270901 Belo Horizonte, MG, Brazil

[2] Univ Fed Minas Gerais, Dept Met & Mat Engn, Fac Dent, BR-31270901 Belo Horizonte, MG, Brazil

[3] Univ Fed Minas Gerais, Dept Restorat Dent, Fac Dent, BR-31270901 Belo Horizonte, MG, Brazil

来源：

ORAL SURGERY ORAL MEDICINE ORAL PATHOLOGY ORAL RADIOLOGY AND ENDODONTOLOGY | 2010年 / 110卷 / 04期

关键词：

ENDODONTIC HAND INSTRUMENTS; ROOT-CANAL PREPARATION; BENDING PROPERTIES; SHAPE-MEMORY; TRANSFORMATION BEHAVIOR; MECHANICAL-PROPERTIES; PHASE-TRANSFORMATION; THERMAL-TREATMENT; PART; PROTAPER;

D O I：

10.1016/j.tripleo.2010.05.006

中图分类号：

R78 [口腔科学];

学科分类号：

1003 ;

摘要：

Objective. The purpose of this study was to assess the influence of both the metallurgic and the geometric characteristics of nickel-titanium endodontic instruments on their flexibility. Study design. ProTaper Universal (PTU), K3, and EndoSequence (ES) instruments were evaluated. Their chemical composition and phase constitution were characterized by conventional analytical techniques. Instrument diameter and cross-sectional area were evaluated by image analysis. Flexibility was evaluated in bending tests according to the ISO 3630-1. Results. K3 presented the highest average bending moment (M-B), followed by PTU and ES. A linear relationship was found between M-B and the instrument's diameter and cross-sectional area at 3 mm from the tip. Alloy chemical compositions were similar among the files, but transformation temperatures were lower for K3 instruments, which presented only austenite as a constituent phase. Conclusion. Nickel-titanium instruments from different manufacturers have unequal behavior related to their flexibility properties. Manufacturing processes changed the phase constitution and transformation temperatures of the instruments investigated and may also have influenced their flexibility. (Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2010;110:527-533)

引用

页码：527 / 533

页数：7

共 31 条

[1] Physical and mechanical characterization and the influence of cyclic loading on the behaviour of nickel-titanium wires employed in the manufacture of rotary endodontic instruments [J].