ORIGINAL RESEARCH. Abstract. Introduction
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1 bs_bs_banner Aust Endod J 2013; 39: ORIGINAL RESEARCH Effect of manual dynamic activation on smear layer removal efficacy of ethylenediaminetetraacetic acid and SmearClear: An in vitro scanning electron microscopic studyaej_ Syed Mukhtar-Un-Nisar Andrabi, MDS; Ashok Kumar, MDS; Surrendra Kumar Mishra, MDS; Rajendra Kumar Tewari, MDS; Sharique Alam, BDS; and Shiraz Siddiqui, BDS Department of Conservative Dentistry and Endodontics, Dr. Z.A. Dental College, Aligarh Muslim University, Aligarh, India Keywords activation, EDTA, endodontic irrigant, smear layer. Correspondence Dr Syed Mukhtar-Un-Nisar Andrabi, Department of Conservative Dentistry and Endodontics, Dr. Z.A. Dental College, Aligarh Muslim University, Aligarh , India. mukhtarandrabi@gmail.com doi: /j x Abstract The purpose of the present study was to evaluate the effect of manual dynamic activation (MDA) with a master gutta-percha point on the smear layer removal efficacy of 17% ethylenediaminetetraacetic acid (EDTA) and SmearClear. Fifty freshly extracted human single-rooted teeth were prepared using ProTaper rotary system up to F3 size. The prepared teeth were divided into five groups on the basis of final irrigation received. Group A: 3% NaOCl solution (negative control group). Group B: 5 ml of 17% EDTA. Group C: 1 ml of 17% EDTA + MDA for 2 min + 4 ml of 17% EDTA rinse. Group D: 5 ml of SmearClear. Group E: 1 ml of SmearClear + MDA for 2 min + 4 ml of SmearClear rinse. Prepared samples were decoronated and then longitudinally split into two halves and evaluated under scanning electron microscope. Representative images at coronal, middle and apical third level were taken and scored for the amount of smear layer present, using a three-score system. The data were analysed through Kruskal Wallis and Mann Whitney U-test. The root canal surfaces of samples of group C and group E (where MDA was done) were significantly cleaner in apical third regions than those of group B and group D (P < 0.05). Introduction The generation of a smear layer is almost inevitable during root canal instrumentation. Smear layer is a mixture of inorganic and organic substances that include dentinal shavings, tissue debris, odontoblastic processes, coagulated proteins and microbial elements (1 3). Smear layer prevents penetration of intracanal medicaments into the irregularities of the canal and dentinal tubules and also prevents complete adaptation of obturation materials to the prepared root canal surfaces (4 6). Smear layer, being a loosely adherent structure, should be completely removed from the surface of the root canal wall because it can harbour bacteria and provide an avenue for leakage (7 10). So far, the most commonly used method of smear layer removal has been the alternating irrigation with a combination of ethylenediaminetetraacetic acid (EDTA) and NaOCl. This combination removes the smear layer completely in the coronal and middle thirds but is less effective in the apical third owing to the inability of the irrigating solutions to reach the apical third of the root canals (11,12). In order to be effective, the solutions must come into contact with the entire surface of the root canal walls. But owing to the complex anatomy and the vapour lock effect in the apical third, conventional static irrigation will not be able to wet the entire surface of the root canal walls (13). Conventional syringe irrigation has been found to reach not mm beyond the tip of the needle, which in most of the cases is within coronal to middle third area (14). Therefore, intracanal agitation/activation of the irrigants is a necessary adjunct to mechanical instrumentation to remove debris and bacteria from the root canals (15,16). Several systems for intracanal 2012 The Authors 131
2 Manual Dynamic Activation S. M.-U.-N. Andrabi et al. agitation of the irrigants have been proposed, which might be categorised as manual agitation devices including the use of hand files, gutta-percha points, and canal brushes, and machine-assisted agitation devices like sonic and ultrasonic devices, rotary brushes and pressure alternation devices (17 22). Studies have shown that gentle up and down movement of a well-fitting gutta-percha master cone in short 2- to 3-mm strokes (manual dynamic activation (MDA)) within an instrumented canal can produce an effective hydrodynamic effect and significantly improve the displacement and exchange of any given reagent (17,23). This will result in better contact of the irrigating solution with the root canal walls, and thus enhance debridement. Studies evaluating the effect of MDA on the smear layer removal efficacy of irrigating solutions are lacking, and therefore the present study was taken. The aim of this study was to compare the smear layer removal efficacy of 17% EDTA (Canalarge; Ammdent, Chandigarh, India) and SmearClear (Sybron Endo, Orange, CA, USA) with and without manual dynamic agitation (MDA). Materials and methods The present study was done in the Department of Conservative Dentistry and Endodontics, Dr. Z.A. Dental College, Aligarh Muslim University, Aligarh, India. Sample selection Fifty freshly extracted human single-rooted maxillary and mandibular teeth consisting of incisors, canines and premolars were collected from the Department of Oral and Maxillofacial Surgery, Dr. Z.A. Dental College, Aligarh Muslim University, Aligarh. All the collected teeth were cleared of blood and saliva and stored in buffered isotonic saline solution. All teeth were radiographed to verify the presence of mature apex, absence of resorption or endodontic obturation. All teeth were stored in 10% formalin solution at 4 C until used. All specimen teeth were utilised for this study within 1 month of extraction. Experimental procedures Access preparations were made by round diamond burs and patency established by passing a #15 k-file (Dentsply Maillefer, Ballaigues, Switzerland) beyond the apex of all canals. Working lengths were determined by subtracting 1 mm from the length at which the tip of the file was visible at the apical foramen. Canals were prepared by ProTaper rotary system. Each canal was prepared up to an apical preparation of F3 size. Sodium hypochlorite 3% (NaOCl; Dentpro Ltd, Chandigarh, India) was used as an intracanal irrigant in between each file size. All prepared teeth were then randomly divided into five groups, four experimental groups and one control group. Each group consisted of 10 teeth. To determine the effect of final rinse on the surface of root canals after instrumentation, the canals in each group were treated with 5 ml of one of the irrigating solutions as follows: Group A: 3% NaOCl solution used as the sole irrigant. (negative control group) Group B: 5 ml of 17% EDTA as a continuous rinse for 3 min Group C: 1 ml of 17% EDTA manually activated with F3 Protaper GP point for 2 min (ª100 push-pull strokes per minute or 1.6 Hz) followed by 4 ml of 17% EDTA rinse for 1 min. Group D: 5 ml of SmearClear as a continuous rinse for 3 min. Group E: 1 ml of SmearClear manually activated with a F3 Protaper GP for 2 min (ª100 push-pull strokes per minute or 1.6 Hz) followed by 4 ml of SmearClear rinse for 1 min. The frequency of the push and pull activation movements with GP point was kept approximately 100 times per minute (ª1.6 Hz).On completion of the final rinse for each group the canals were then dried with paper points. The crowns of all teeth were sectioned at the level of cemento-enamel junction (CEJ) using slow speed diamond disc with water coolant system and a chisel. In the process of decoronation, first a non-penetrating groove was prepared around the CEJ of each tooth and then split with a chisel. The decoronated teeth were then prepared for sectioning. Two longitudinal grooves were prepared on the buccal and lingual root surfaces of the prepared teeth without penetrating into the canal, and teeth were finally divided into two halves with the help of a chisel. The half containing the most part of the apex was selected as the representative sample and coded. Coded samples were then scheduled for scanning electron microscopic (SEM) evaluation. Coded samples were dehydrated with ascending concentrations of ethyl alcohol (30% 100%), and placed in a desiccator for at least 24 h, mounted on metallic stubs, gold sputtered and viewed under scanning electron microscope (Inca-x 50; Oxford Instruments, England, UK, kv 5 to ). SEM evaluation The entire length of the sample was divided equally into cervical, middle and apical thirds in order to be evaluated separately. After a general survey scan of each third of the canal wall at a magnification of 250, representative The Authors
3 S. M.-U.-N. Andrabi et al. Manual Dynamic Activation Figure 1 (a) Score 1 = no smear layer: no smear layer was detected on the surface of root canal and all tubules were open. (b) Score 2 = moderate smear layer: no smear layer on root canal walls but tubules contained debris. (c) Score 3 = heavy smear layer: smear layer covered the root canal wall surface and the tubules. Figure 2 Scanning electron microscopic images of group A (control group): (a) coronal third image, (b) middle third image, (c) apical third image. images of each third were taken with 500, 1000 and The images of 1000 were then analyzed for the amount of smear layer present by two independent observers without knowing which group they were analyzing. Evaluation was repeated twice for the first 10 specimens to ensure intra-examiner consistency. The amount of smear layer remained on the surface of the root canal and dentinal tubules were scored according to the following criteria used by Torabinejad et al.: Score 1 = no smear layer: no smear layer was detected on the surface of root canal and all tubules were open (Fig. 1a) Score 2 = moderate smear layer: no smear layer on root canal walls but tubules contained debris (Fig. 1b) Score 3 = heavy smear layer: smear layer covered the root canal wall surface and the tubules (Fig. 1c) The data were analyzed through Kruskal Wallis and Mann Whitney U-test and comparisons were made as follows: 1. Pairwise comparison of all groups with the control group at coronal, middle and apical third level using Mann Whitney U-test. 2. Pairwise intergroup comparison of all experimental groups with each other at coronal, middle and apical third level using Mann Whitney U-test. 3. Intra-group comparison of each group within coronal, middle and apical third level using Kruskal Wallis test. Results The examination of the surface of root canal walls in group A (control group) showed the presence of a heavy smear layer throughout the entire length of the root canals (Fig. 2). The mean scores of the samples for all experimental groups at each third of the canal were less than those of the control group (Table 1). The comparison of all the five groups at coronal and middle thirds showed that the canal walls in the group B (Fig. 3), group C (Fig. 4), group D (Fig. 5) and group E (Fig. 6) were significantly cleaner than in group A (control group) (P < 0.01). Intergroup comparison of groups B, C, D and E showed no statistically significant difference at coronal and middle levels. Comparison of the apical third scores of all the experimental groups showed that the root canal surfaces were comparatively cleaner in apical thirds of groups C and E where manual activation was done than in groups B and D where no manual activation of the irrigating solution was done (P < 0.05). On intra-group comparison of three one-thirds of the canals in each group (using Kruskal Wallis test), there was no statistically significant difference seen (P > 0.05) in group C (EDTA with manual activation) and group E (SmearClear with manual activation). But in the groups B and D (where no manual activation was done), the 2012 The Authors 133
4 Manual Dynamic Activation S. M.-U.-N. Andrabi et al. Table 1 Mean smear scores ( SD) and intra-group comparison between coronal, middle and apical thirds of the canals in each group Coronal third scores Middle third scores Apical third scores Group Mean SD Mean SD Mean SD P value Group A (negative control group) Group B (17% EDTA continuous rinse) Group C (17% EDTA with MDA) Group D (SmearClear continuous rinse) Group E (SmearClear with MDA) (P > 0.05) (P < 0.01) (P > 0.05) (P < 0.01) (P > 0.05) EDTA, ethylenediaminetetraacetic acid; MDA, manual dynamic activation; SD, standard deviation. Figure 3 Scanning electron microscopic images of group B (ethylenediaminetetraacetic acid): (a) coronal third image, (b) middle third image, (c) apical third image. Figure 4 Scanning electron microscopic images of group C (ethylenediaminetetraacetic acid with manual dynamic activation): (a) coronal third image, (b) middle third image, (c) apical third image. efficacy of the agent was significantly less in the apical third of the samples compared with the coronal and middle thirds (P < 0.05) (Table 1). Discussion MDA involves repeated up and down motion of a welltapered gutta-percha master cone in short gentle strokes to hydrodynamically displace and agitate a solution by producing eddy currents. This results in displacement of the apical air bubble which is responsible for the vapor lock effect. The up and down motion of a well-fitting gutta-percha point in the canal generates higher intracanal pressure changes leading to more effective delivery of irrigant to the untouched canal surfaces and also results in better mixing of the fresh unreacted solution with the spent, reacted irrigant (23,24). MDA of the solution showed significantly cleaner root canal surfaces than those where no activation was done. This can be attributed to the fact that the vertical stroke pumping motion of a tapered gutta-percha cone produces an effective hydrodynamic activation of the solution and constant renewal of the spent irrigant. Whenever the gutta-percha tip moves towards working length, the The Authors
5 S. M.-U.-N. Andrabi et al. Manual Dynamic Activation Figure 5 Scanning electron microscopic images of group D (SmearClear): (a) coronal third image, (b) middle third image, (c) apical third image. Figure 6 Scanning electron microscopic images of group E (SmearClear with manual dynamic activation): (a) coronal third image, (b) middle third image, (c) apical third image. reagent is displaced, and whenever the tip is partially withdrawn, there is an effective exchange of solution into the apical one-third of the canal. This hydrodynamic circuit produces better reach of the solution into the apical third area and also neutralises the vapour lock effect resulting in enhanced smear layer removal and cleaner root canal surfaces. Manual activation with guttapercha points can be more effective because they are non-cutting and there is no risk of generation of a new smear layer on their contact with the canal walls. Furthermore, there will be no risks of generation of an internal ledge or external transportation of the foramen. The laborious nature of the MDA can be seen as a major disadvantage of this technique. This may become a limiting factor for some clinicians to adopt this technique in routine endodontic practice. However, its costeffectiveness, simplicity and efficacy to enhance root canal irrigation can outweigh the amount of labour involved in this technique. Furthermore, other contemporary machine-assisted irrigant activation systems are technique sensitive and require a specific equipment, and also there is no clinical study available to date supporting the supremacy of these devices over MDA in terms of improvements in treatment outcomes. Conclusion Within the experimental protocol of the present study, MDA of both EDTA and SmearClear improves their smear layer removing efficacy especially in the apical third area of the root canals. Thus, it can be used as an adjunct to routine chemo-mechanical debridement. Further studies evaluating its effectiveness in clinical conditions are needed. References 1. McComb D, Smith DC. A preliminary scanning electron microscopic study of root canals after endodontic procedures. J Endod 1975; 1: Moodnik RM, Dorn SO, Feldman MJ, Levey M, Borden BG. Efficacy of biomechanical instrumentation: a scanning electron microscopic study. J Endod 1976; 2: Mader CL, Baumgartner JC, Peters DD. Scanning electron microscopic investigation of the smeared layer on root canal walls. J Endod 1984; 10: Bystrom A, Sundqvist G. Bacteriologic evaluation of the efficacy of mechanical root canal instrumentation in endodontic therapy. Scand J Dent Res 1981; 89: Ørstavik D, Haapasalo M. Disinfection by endodontic irrigants and dressings of experimentally infected dentinal tubules. Endod Dent Traumatol 1990; 6: Baumgartner JC, Mader CL. A scanning electron microscopic evaluation of four root canal irrigation regimens. J Endod 1987; 13: Gettleman BH, Messer HH, ElDeeb ME. Adhesion of sealer cements to dentin with and without the smear layer. J Endod 1991; 17 (1): The Authors 135
6 Manual Dynamic Activation S. M.-U.-N. Andrabi et al. 8. Foster KH, Kulild JC, Weller RN. Effect of smear layer removal on the diffusion of calcium hydroxide through radicular dentin. J Endod 1993; 19 (3): Froes JA, Horta HG, da Silveira AB. Smear layer influence on the apical seal of four different obturation techniques. J Endod 2000; 26 (6): Shahravan A, Haghdoost AA, Adl A, Rahimi H, Shadifar F. Effect of smear layer on sealing ability of canal obturation: a systematic review and meta-analysis. J Endod 2007; 33 (2): Rome WJ, Doran JE, Walker WA 3rd. The effectiveness of Gly-Oxide and sodium hypochlorite in preventing smear layer formation. J Endod 1985; 11 (7): O Connell MS, Morgan LA, Beeler WJ, Baumgartner JC. A comparative study of smear layer removal using different salts of EDTA. J Endod 2000; 26: Chow TW. Mechanical effectiveness of root canal irrigation. J Endod 1983; 9: Boutsioukis C, Lambrianidis T, Kastrinakis E, Bekiaroglou P. Measurement of pressure and flow rates during irrigation of a root canal ex vivo with three endodontic needles. Int Endod J 2007; 40: McGill S, Gulabivala K, Mordan N, Ng YL. The efficacy of dynamic irrigation using a commercially available system (RinsEndo) determined by removal of a collagen bio-molecular film from an ex vivo model. Int Endod J 2008; 41: Huang TY, Gulabivala K, Ng Y-L. A bio-molecular film ex-vivo model to evaluate the influence of canal dimensions and irrigation variables on the efficacy of irrigation. Int Endod J 2008; 41: Gu LS, Kim JR, Ling J, Choi KK, Pashley DH, Tay FR. Review of contemporary irrigant agitation techniques and devices. J Endod 2009; 35: Gutarts R, Nusstein J, Reader A, Beck M. In vivo debridement efficacy of ultrasonic irrigation following handrotary instrumentation in human mandibular molars. J Endod 2005; 31: Kuah HG, Lui JN, Tseng PS, Chen NN. The effect of EDTA with and without ultrasonics on removal of the smear layer. J Endod 2009; 35: Jiang LM, Verhaagen B, Versluis M, van der Sluis LW. Evaluation of a sonic device designed to activate irrigant in the root canal. J Endod 2010; 36: Uroz-Torres D, Gonzalez-Rodriguez MP, Ferrer-Luque CM. Effectiveness of the Endo Activator System in removing the smear layer after root canal instrumentation. J Endod 2010; 36: Salman MI, Baumann MA, Hellmich M, Roggendorf MJ, Termaat S. SEM evaluation of root canal debridement with Sonicare CanalBrush irrigation. Int Endod J 2010; 43: Caron G, Nham K, Bronnec F, Machtou P. Effectiveness of different final irrigant activation protocols on smear layer removal in curved canals. J Endod 2010; 36: Saber S El-D, Hashem AA. Efficacy of different final irrigation activation techniques on smear layer removal. J Endod 2011; 37: The Authors
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