In vitro evaluation of root canal preparation using oscillatory and rotary systems in flattened root canals

Luis Cardoso Rasquin, Fabíola Bastos de Carvalho, Regina Karla de Pontes Lima, Luis Cardoso Rasquin, Fabíola Bastos de Carvalho, Regina Karla de Pontes Lima

Abstract

Objective: The aim of this study was to evaluate the biomechanical preparation of flattened root canals using the following systems: Endo-Eze AET stainless steel oscillatory instruments (Ultradent) and RaCe rotary NiTi instruments (FKG Dentaire).

Material and methods: Twenty extracted human mandibular incisors were randomly assigned to two groups: Group 1 - Instrumentation with oscillatory Endo-Eze AET files (oscillatory technique); Group 2 - Instrumentation with rotary NiTi RaCe files (rotary technique). The teeth were decoronated, had their apices and coronal openings sealed with sticky wax and were embedded in crystal-clear orthophtalic polyester resin. The roots were sectioned transversally with diamond discs at 10 mm (middle third) and 5 mm (apical third) from the apex and the segments were reassembled for instrumentation. The sections were photographed before and after root canal instrumentation and evaluated with respect to whether the original root canal shape was modified by instrumentation. To evaluate the differences in the root canal shape before and after biomechanical preparation, scores were given regarding the instruments touch on the intracanal walls.

Results: In middle third of the root canals instrumented with the rotary system, there was a change in the original canal anatomy (p<0.05), with formation of a protuberance in the mesiodistal direction. This protuberance did not occur when the oscillatory instrumentation was used. The oscillatory system had better results in the middle and apical thirds as evaluated by Dunn's multiple-comparison test (p>0.05).

Conclusion: Under the tested conditions, Endo-Eze oscillatory system yielded the instrumentation of all flattened root canal walls, maintaining the canal original shape throughout the biomechanical preparation, and was more effective than RaCe rotary system.

Figures

FIGURE 1. Frontal view of the PVC…
FIGURE 1. Frontal view of the PVC ring (a) and PVC with its base perforated (b)
FIGURE 2. Middle third before (a) and…
FIGURE 2. Middle third before (a) and after (b) preparation with RaCe system (Score 2)
FIGURE 3. Apical third before (a) and…
FIGURE 3. Apical third before (a) and after (b) preparation with RaCe system (Score 2)
FIGURE 4. Middle third before (a) and…
FIGURE 4. Middle third before (a) and after (b) preparation with Endo-Eze system (Score 4)
FIGURE 5. Apical third before (a) and…
FIGURE 5. Apical third before (a) and after (b) preparation with Endo-Eze system (Score 4)

References

    1. Barbizam JVB, Fariniuk LF, Marchesan MA, Pecora JD, Sousa-Neto MD. Effectiveness of manual and rotary instrumentation techniques for cleaning flattened root canals. J Endod. 2002;28(5):365–366.
    1. Bramante CM, Berbert A, Borges RPA. A methodology for evaluation of root canal instrumentation. J Endod. 1987;3(5):243–245.
    1. Calhoun G, Montgomery S. The effects of four instrumentation techniques on root canal shape. J Endod. 1998;14(6):273–277.
    1. Camargo JMP. Estudo comparativo do preparo do canal radicular de dentes artificiais utilizando diferentes técnicas automatizadas de instrumentação [tese] Araraquara (SP): Faculdade de Odontologia, Universidade Estadual Paulista; 2004.
    1. Iqbal MK, Karabucak B, Brown M, Menegazzo E. Effect of modified Hedström files on instrumentation area produced by ProFile instruments in oval canals. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2004;98(4):493–498.
    1. Leonardo ML, Leal JM. Endodontia: tratamento de canais radiculares. 3. ed. São Paulo: Panamericana; 1998.
    1. Limongi O, Ramos IFA, Troian CH, Vanni JR, Albuquerque DS, Barato-Filho F. In vitro analysis of the apical deviation, observed in the proximal sense, produced by two alternated rotation systems: Endo-Gripper and M4. JBE J Bras Endod. 2004;5(16):67–72.
    1. Lyon LA, Lopes HP, Lyon JP, Robazza CRC. NiTi and Inox instruments activated by na especial hand piece: apical displacement. Rev Bras Odontol. 2003;60(5):340–342.
    1. Marchesan MA, Arruda MP, Silva-Sousa YTC, Saquy PC, Pecora JD, Sousa-Neto MD. Morphometrical analysis of cleaning capacity using nickel-titanium rotary instrumentation associated with irrigating solution in mesiodistal flattened root canals. J Appl Oral Sci. 2003;11(1):55–59.
    1. Paqué F, Musch U, Hülsmann M. Comparison of root canal preparation using RaCe and ProTaper rotary Ni-Ti instruments. Int Endod J. 2005;38(1):8–16.
    1. Roane JB, Sabala CL, Duncanson MG., Junior The “Balanced force” concept for instrumentation of curved canals. J Endod. 1985;11(5):203–211.
    1. Rödig T, Hülsmann M, Mühge M, Schäfers F. Quality of preparation of oval distal root canals in mandibular molars using nickel-titanium instruments. Int Endod J. 2002;35(11):919–928.
    1. Royal J, Donnelly J. A comparison of maintenance of canal curvature using balanced forces instrumentation with three different file types. J Endod. 1995;21(6):300–304.
    1. Sydney GB, Batista A. MR Leonardo. Endodontia: tratamento de canais radiculares. São Paulo: Artes Médicas; 2005. Instrumentação não convencional de canais radiculares: sistemas de rotação alternada; pp. 767–785.
    1. Wu MK, Wesselink PRA. A primary observation on the preparation and obturation of oval canals. Int Endod J. 2001;34(3):137–141.
    1. Wu MK, R’oris A, Barkis D, Wesselink PR. Prevalence and extent of long oval canals in the apical third. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2000;89(6):739–743.

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