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HOME > Restor Dent Endod > Volume 37(4); 2012 > Article
Research Article A survey of experience-based preference of Nickel-Titanium rotary files and incidence of fracture among general dentists
WooCheol Lee1, Minju Song2, Euiseong Kim2, Hyojin Lee3, Hyeon-Cheol Kim4
2012;37(4):-206.
DOI: https://doi.org/10.5395/rde.2012.37.4.201
Published online: November 21, 2012

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Correspondence to Hyeon-Cheol Kim, DDS, PhD. Associate Professor, Department of Conservative Dentistry, Pusan National University School of Dentistry, 49, Busandaehak-ro, Mulgeum-eup, Yangsan, Korea 626-870. TEL, +82-55-360-5222; FAX, +82-55-360-5214; golddent@pusan.ac.kr
• Received: June 1, 2012   • Revised: July 12, 2012   • Accepted: July 15, 2012

©Copyights 2012. The Korean Academy of Conservative Dentistry.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Objectives
    The purpose was to investigate the preference and usage technique of NiTi rotary instruments and to retrieve data on the frequency of re-use and the estimated incidence of file separation in the clinical practice among general dentists.
  • Materials and Methods
    A survey was disseminated via e-mail and on-site to 673 general dentists. The correlation between the operator's experience or preferred technique and frequency of re-use or incidence of file fracture was assessed.
  • Results
    A total of 348 dentists (51.7%) responded. The most frequently used NiTi instruments was ProFile (39.8%) followed by ProTaper. The most preferred preparation technique was crown-down (44.6%). 54.3% of the respondents re-used NiTi files more than 10 times. There was a significant correlation between experience with NiTi files and the number of reuses (p = 0.0025). 54.6% of the respondents estimated experiencing file separation less than 5 times per year. The frequency of separation was significantly correlated with the instrumentation technique (p = 0.0003).
  • Conclusions
    A large number of general dentists in Korea prefer to re-use NiTi rotary files. As their experience with NiTi files increased, the number of re-uses increased, while the frequency of breakage decreased. Operators who adopt the hybrid technique showed less tendency of separation even with the increased number of re-use.
  • Keywords: Crown-down technique; Fracture incidence; Hybrid technique; Nickel-titanium rotary file; Preference
In 1988, root canal instruments manufactured from nickel-titanium (NiTi) alloy were introduced to overcome the rigidity of stainless steel.1 Since then, various NiTi rotary systems have been constantly released. Continuous improvements have been made to the instruments' design and implementation in the hope of achieving shaping efficiency while reducing the risk of procedural accidents, such as transportation or file separation.2-5 Nevertheless, each NiTi system has different mechanical properties and clinical performance based on its geometrical characteristics and manufacturing methods.6-9
Since the crown-down technique was introduced for manual instrumentation in 1984, it has proved invaluable for rotary preparation systems using NiTi instruments and has become a fundamental part of rotary preparation.10 However, various file systems differ in shaping performance, and it has been suggested that the hybrid use of 2 or more systems may achieve better shaping efficacy and reduce file fracture.11 Some NiTi rotary file systems are thought to be effective with sequential use of the instrument for up to the total working length.12-14
The crown-down technique is the preferred instrumentation technique, and ProFile or ProTaper are the most frequently used NiTi rotary file systems among diplomats and/or active members of the American Board of Endodontists.15,16 For clinicians, it is of utmost importance to select proper instruments and techniques to obtain high cutting efficiency and predictable control over the entire instrumentation procedure without aberrations. The latest data on the use of NiTi files can be obtained from web-based publications reporting leaders' opinions and surveys of current trends.15-17 Many techniques for the use of NiTi rotary files have been recommended by manufacturers and researchers, who report preparation efficiency and cutting safety for reducing file fracture.
There is a general perception that NiTi rotary files have a considerable risk of fracture during use. Clinically, there is a potential for rotary NiTi instruments to separate in the canal, and even new instrument may unexpectedly break on its first use.18-21 According to the survey studies, operators recognize file fracture as one of the most prominent issues with NiTi rotary instruments.16 Further, they consider practitioner's experience, preparation technique, and overuse as factors related to file fracture.17,21 However, there is little available information on clinical experience, frequency of reuse, and incidence of file separation among the operators.
Therefore, the purpose of this survey was to investigate the preference and usage technique of the NiTi rotary instrument among general dentists on the basis of their clinical experience. This questionnaire also retrieved data on the frequency of NiTi file re-use and the estimated incidence of file separation in the clinical practice setting.
A survey was disseminated via e-mail and on site to 673 general dentists. The on-site questionnaire was distributed to 473 dentists who attended a dental conference in May 2010. An e-mail survey with the same questionnaire was sent during the same time period to 200 general dentists in South Korea who left their e-mail address during the registration period for the conference. The survey consisted of 7 questions regarding the file brands, usage techniques, frequency of re-use, and occurrence of file fracture during canal preparation with NiTi rotary instruments (Table 1). Some participants provided more than one reply to each question, and some did not respond to certain questions. Percentages were calculated based on the number of respondents or responses to each question. The correlation between the operator's experience (NiTi file experience) or preferred technique and frequency of re-use and the correlation between the experience or technique and the incidence of file fracture were assessed using a Pearson κ square test at a 5% significance level.
A total of 348 general dentists responded to the questionnaire either on site or by e-mail, representing a 51.7% response rate. More than 42% of the respondents were the dentists who graduated from dental school within the previous 5 years, 23.9% graduated within the previous 5 to 10 years, 16.7% graduated within the previous 11 to 20 years, and 16.7% graduated more than 21 years before. Most general dentists had been using the NiTi rotary files for more than 2 years (49.4%). Beginner users of NiTi rotary files were the second most common population (33.7%), and 16.9% reported they had been using NiTi rotary files for 6 to 24 months. The most frequently used NiTi instruments for root canal treatment was ProFile (39.8%) followed by ProTaper (32.6%) (Figure 1). ProFile was most commonly used among inexperienced operators (43.0%) as well as experienced operators (40.1%) (Table 2). The most preferred preparation technique among the respondents was crown-down (44.6%). However, sequential preparation (29.3%) and hybrid technique (26.0%) were also used (Table 3). The combinations of ProTaper/ProFile (33.6%) and gate-glidden drill/ProFile (29.6%) were the 2 most common combinations among the respondents who reported using a hybrid technique.
The data in Table 4 demonstrate that 54.3% of the respondents re-used NiTi files more than 10 times. Only 6 respondents (1.9%) reported discarding NiTi files after a single use. There was a significant correlation between experience with NiTi files and the number of re-uses. Experienced operators more commonly reported reusing files more than 10 times, while beginners reported discarding NiTi files after less than 5 uses (p = 0.0025). However, there was no significant correlation between experience with NiTi files and the frequency of file separation (p = 0.0583). There was a significant correlation between the preparation technique and the number of file re-uses (p = 0.0003). The operators who used the crown-down technique reported reusing NiTi files less than 5 times, while those using the hybrid technique tended to re-use files more than 10 times.
Regarding the incidence of file fracture, 54.6% of the respondents estimated experiencing NiTi file separation less than 5 times per year (Table 5). The frequency of file fracture was significantly correlated with the instrumentation technique (p = 0.0003). The operators who used the sequential total length technique showed a strong tendency toward increased file fractures (more than once per month). On the other hand, users of the hybrid technique commonly reported experiencing file fractures less than 5 times per year or not at all.
Proper root canal shaping without procedural accidents, such as transportation or file separation, is of the utmost importance for clinicians. To minimize these accidents, practitioners establish their techniques for proper usage of NiTi files based on information acquired from continuing education courses and/or articles reporting survey data.15-17,22 As a research tool, surveys provide information on opinions, attitudes, and behaviors of respondents. Surveys should be planned well and conducted to achieve a high response rate, so results will be representative.23 This study had an overall response rate of 51.7%, which was acceptable for dental surveys (50 - 70%) although it was not high enough.24
Our results revealed that the majority of participants (66.7%) graduated from dental school within the previous 10 years. This might have been because dentists with over 10 years of practical experience were hesitant to use NiTi file systems and adopt new armamentarium. This pattern of usage was confirmed by the survey of Parashos and Messer.22 Almost half of the respondents reported using NiTi files for more than 2 years (49.4%). They may have participated in this survey, because they wanted to achieve better outcomes from root canal treatments by learning and sharing new technical knowledge with the community. Continuing education courses in endodontics enable clinicians to update their knowledge and learn new instrumentation techniques.25 In Korea, NiTi rotary systems have not been made mandatory in the undergraduate curriculum. As such, further education courses might be necessary. ProFile and ProTaper were the two most frequently used NiTi rotary instruments among general dentists, which is consistent with results of a survey from 2009.15 In the present survey, 204 respondents (39.8%) choose ProFile as a primary rotary instrument. Among them, 99 respondents (48.5%) selected ProTaper as a second answer. It is presumed that ProFile and ProTaper might be alternatively used as a primary NiTi file by the same operator. This suggests that these two files are complementary by compensating for each other's drawbacks. The results of this survey confirmed that ProTaper/ProFile is the most frequently used combination among the hybrid technique.
It is recommended that NiTi rotary instruments be discarded after a single use.18 A single use is ideal for reducing the risk of file separation; however, the high operating cost of NiTi files has forced clinicians to re-use them. The incidence of rotary NiTi file separation after repeated clinical use has been reported to be between 1.68% and 2.4%.19,20 One in vitro study demonstrated that NiTi files can be used up to 10 times without significant reduction of fracture resistance.26 Wolcott et al.20 suggested that ProTaper may be re-used at least 4 times, because a greater number of instrument failures occurred during the fifth use. Even though manufacturers often recommend only a single use, it is not unusual for clinicians to use NiTi instruments more than 5 times.27 Previous surveys also revealed no consensus on the reusability of NiTi instruments.16,17 According to a UK survey, 32% of general dentists reported discarding their NiTi instruments after a single use, while 40% reported reusing them 2 - 5 times, and 27.2% reported reusing them more than 6 times.17 In a US study, Bird et al. reported that the majority of respondents used NiTi instruments on 2 - 4 patients before discarding them, whereas 21% used NiTi rotary instruments only a single time before discarding.16 The present survey results showed that only 1.9% of respondents discarded NiTi instruments after a single use, while 54.3% of the respondents re-used NiTi files more than 10 times. Therefore, multiple uses were more prominent than single uses among the respondents (Table 5). The frequency of reusing NiTi files differed according to experience with NiTi files (p = 0.0025). Experienced operators had a strong tendency of reusing NiTi files more than 10 times, while beginners showed a tendency of discarding NiTi files after less than 5 re-uses. This was due to the experience-based opinion that a file can be safely re-used more. It seems that experienced operators do not rush through a procedure or lose feeling for the instruments, so that it could decrease the chance of a torsional failure.14,28
The preparation technique was also correlated with the number of file re-uses. Specifically, the operators who use the crown-down technique re-used NiTi files less than 5 times, while respondents who adopted the hybrid technique showed a strong tendency to re-use files more than 10 times (p = 0.0003). Meanwhile, more than 54% of beginners used the crown-down technique, whereas the majority of operators who used the hybrid technique were experienced operators. This suggests that the preparation technique may reflect the NiTi file usage experience. Our survey revealed that beginners showed a higher tendency of file fracture (more than once per month), while experienced NiTi users reported fractures less than 5 times per year. However, we found no correlation between the experience of NiTi file users and the frequency of file separation (p = 0.0583). This result is consistent with that of Madarati et al., who did not identify a correlation between the frequency of file fracture and the length of experience with NiTi instruments.17 Meanwhile, the frequency of file fracture was positively correlated with the number of root canals prepared.
In contrast, the preparation technique was associated with the frequency of file separation (p = 0.0003). The majority of respondents reported NiTi file separation less than 5 times per year. However, operators who use the sequential total length technique tended to experience file fracture more than once per month. The crown-down technique for root canal preparation has been used for more effective cleaning and shaping, especially after the development of NiTi rotary files. It minimizes coronal interference, allows minimal engaging surface of each instrument, decreases the torque load of each instrument, and reduces procedural errors. The hybrid technique does not deviate from the principles of the crown-down preparation. Therefore, experienced operators combine instruments from different file systems and use different instrumentation techniques to achieve the best biomechanical cleaning and shaping results, resulting in the fewest procedural errors.11,29-31 The total length technique is designed for using NiTi files in a sequential manner to working length, shaping with progressively larger instruments. This instrumentation technique is also called step-back enlargement of NiTi file or the single length technique, because the full length of the canal is approached at the same time and shaped in a step-back manner.12,14,18 It was reported that this technique does not cause apical transportation or aberration in canal morphology.32 However, our survey demonstrated that the operators who use the sequential total length technique reported file fractures more than once per month. Many fractured instrument fragments are 1.5 mm or less in length. Therefore, clinicians may not even be aware of their stress and fracture.5 Considered the higher probability of apical contact than other preparation techniques, the sequential total length technique must be used with caution.
A large number of general dentists in Korea prefer to re-use NiTi rotary files. Moreover, as their experience with NiTi files increased, the number of re-uses increased, while the frequency of breakage decreased. Regarding preparation technique, operators who adopt the hybrid technique showed less tendency of NiTi file separation even with the increased number of re-use. Although this survey is not representative of all dentists in Korea, it will help our understanding of current performance and will provide direction for further education and training.
Dr. Lee and Dr. Song contributed equally to this work and share first authorship. The authors have no financial affiliations related to this study or its sponsors.

This work was supported by a 2-Year Research Grant of Pusan National University.

No potential conflict of interest relevant to this article was reported.

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Figure 1
Preference of NiTi rotary instruments.
rde-37-201-g001.jpg
Table 1
Questionnaire form
rde-37-201-i001.jpg
Table 2
Most frequently used NiTi instruments according to experience
rde-37-201-i002.jpg
Table 3
Preference of NiTi rotary file instrumentation technique according to experience
rde-37-201-i003.jpg
Table 4
Frequency of NiTi file re-use according to experience
rde-37-201-i004.jpg
Table 5
Estimated frequency of NiTi file breakage according to experience
rde-37-201-i005.jpg

Tables & Figures

REFERENCES

    Citations

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      A survey of experience-based preference of Nickel-Titanium rotary files and incidence of fracture among general dentists
      Restor Dent Endod. 2012;37(4):201-206.   Published online November 21, 2012
      DOI: https://doi.org/10.5395/rde.2012.37.4.201
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    A survey of experience-based preference of Nickel-Titanium rotary files and incidence of fracture among general dentists
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    Figure 1 Preference of NiTi rotary instruments.

    Figure 1

    A survey of experience-based preference of Nickel-Titanium rotary files and incidence of fracture among general dentists

    Questionnaire form

    Most frequently used NiTi instruments according to experience

    Preference of NiTi rotary file instrumentation technique according to experience

    Frequency of NiTi file re-use according to experience

    Estimated frequency of NiTi file breakage according to experience
    Table 1 Questionnaire form

    Table 2 Most frequently used NiTi instruments according to experience

    Table 3 Preference of NiTi rotary file instrumentation technique according to experience

    Table 4 Frequency of NiTi file re-use according to experience

    Table 5 Estimated frequency of NiTi file breakage according to experience

    Table 1

    Table 2

    Table 3

    Table 4

    Table 5

    Restor Dent Endod : Restorative Dentistry & Endodontics
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