A comparison of Profile, Hero 642, and K3 instrumentation systems in teeth using digital imaging analysis.

OBJECTIVE To evaluate the changes in cross-sectional area morphology of curved canals after instrumentation with Profile((R)), Hero 642((R)), and K3((R)) using digital imaging analysis. Study design Thirty mesial mandibular curved canals were used (25-40 degrees ). The molars were embedded in resin and the roots were sectioned transversely at three levels: apical, middle, and coronal. The canals were randomly distributed into 3 groups for instrumentation using Profile.04 and.06, Hero 642, and K3. The pre- and postinstrumentation sections were digitized and areas corresponding to the canals were measured with image-processing software. RESULTS Hero eliminated significantly more dentine than K3 and Profile in all 3 sections (P <.01, ANOVA test), with no differences observed between the latter 2 systems (P >.05, Student-Newman-Keuls test). All 3 systems yielded a rounded canal morphology in the coronal, middle, and apical thirds. CONCLUSION Hero rotary instruments produced more changes in cross-sectional area of the root canal.

[1]  S. W. Schneider,et al.  A comparison of canal preparations in straight and curved root canals. , 1971, Oral surgery, oral medicine, and oral pathology.

[2]  P J Liepins,et al.  A comparison of two nickel-titanium instrumentation techniques in teeth using microcomputed tomography. , 2000, International endodontic journal.

[3]  S. A. Thompson,et al.  Shaping ability of Hero 642 rotary nickel-titanium instruments in simulated root canals: Part 1. , 2000, International endodontic journal.

[4]  C Kobayashi,et al.  A new engine-driven canal preparation system with electronic canal measuring capability. , 1997, Journal of endodontics.

[5]  S A Thompson,et al.  Shaping ability of Profile rotary nickel-titanium instruments with ISO sized tips in simulated root canals: Part 1. , 2002, International endodontic journal.

[6]  J D Brilliant,et al.  The effect of serial preparation versus nonserial preparation on tissue removal in the root canals of extracted mandibular human molars. , 1975, Journal of endodontics.

[7]  H Schilder,et al.  Cleaning and shaping the root canal. , 1974, Dental clinics of North America.

[8]  F. Barbakow,et al.  Preparation of the apical part of the root canal by the Lightspeed and step-back techniques. , 1998, International endodontic journal.

[9]  J. George,et al.  A method of canal preparation to control apical extrusion of low-temperature thermoplasticized gutta-percha. , 1987, Journal of endodontics.

[10]  G. Glickman,et al.  Analysis of nickel-titanium versus stainless steel instrumentation by means of direct digital imaging. , 1996, Journal of endodontics.

[11]  L S Buchanan,et al.  The standardized-taper root canal preparation, Part 2: GT file selection and safe handpiece-driven file use. , 1999, Dentistry today.

[12]  O A Peters,et al.  Changes in root canal geometry after preparation assessed by high-resolution computed tomography. , 1999, Journal of endodontics.

[13]  K Gulabivala,et al.  An in vitro comparison of canal preparation using two automated rotary nickel-titanium instrumentation techniques. , 2000, International endodontic journal.

[14]  L S Buchanan,et al.  The standardized-taper root canal preparation, Part 1: Concepts for variably tapered shaping instruments. , 1999, Dentistry today.

[15]  J. Short,et al.  A comparison of canal centering ability of four instrumentation techniques. , 1997, Journal of endodontics.

[16]  C M Bramante,et al.  A methodology for evaluation of root canal instrumentation. , 1987, Journal of endodontics.

[17]  F. Barbakow,et al.  The 'Lightspeed' preparation technique evaluated by Swiss clinicians after attending continuing education courses. , 1997, International endodontic journal.

[18]  G. Yared,et al.  Influence of rotational speed, torque and operator's proficiency on ProFile failures. , 2001, International endodontic journal.

[19]  S B Dove,et al.  A comparison of root canal preparations using Ni-Ti hand, Ni-Ti engine-driven, and K-Flex endodontic instruments. , 1995, Journal of endodontics.