ENDODONTIC RETREATMENT OF A MANDIBULAR FIRST MOLAR WITH FIVE ROOT CANALS: A CASE REPORT
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1 CASE REPORTS ENDODONTIC RETREATMENT OF A MANDIBULAR FIRST MOLAR WITH FIVE ROOT CANALS: A CASE REPORT Camil Ioan Ianes 1, Luminita Maria Nica 1, Stefan-Ioan Stratul 2, Virgil Carligeriu 1 REZUMAT Cu toate că molarul prim mandibular este în general un dinte bi-radicular cu o anatomie endodontică necomplicată, variațiile morfologiei sale radiculare trebuie luate în considerare de fiecare dată când realizăm tratamentul endodontic al acestui dinte. Acest raport de caz descrie retratamentul endodontic efectuat pe un molar mandibular cu cinci canale radiculare, localizate două în rădăcina distală, și trei în rădăcina sa mezială. În recunoașterea anatomiei endodontice particulare, deosebit de utile sunt radiografiile periapicale pre-operatorii, efectuate din mai multe incidente. Instrumentele rotative din aliaje de nichel-titan ProTaper Universal (Dentsply Maillefer, Ballaigues, Switzerland) pentru tratament și retratament au fost utilizate în indepartarea materialului de obturație endodontică existent și în realizarea preparației endodontice, totul sub control vizual direct cu ajutorul microscopului operator endodontic (Opmi Pico, Carl Zeiss, Oberkochen, Germany). Obturarea spațiului endodontic corect curățit și preparat s-a realizat prin tehnica undei continue, centrate de obturare, utilizând gutaperca termoplasticizată (System B/Obtura II). Calitatea tratamentului endodontic efectuat a fost confirmată prin radiografiile de control post-operatorii. Cuvinte cheie: anatomie endodontică, retratament, molar, terapie endodontică REZUMAT Although the first lower molar is commonly a bi-rooted tooth with an uncomplicated endodontic anatomy, variations have to be considered every time endodontic therapy is performed. This case report describes the non-surgical endodontic retreatment performed on a mandibular first molar with five root canals, located two in the distal root, and three in the mesial root. Pre-operative periapical X-rays, taken in more than one incidence, were useful in recognizing the particular endodontic anatomy of the treated tooth. ProTaper Universal rotary nickel-titanium instruments (Dentsply Maillefer, Ballaigues, Switzerland) for retreatment & treatment were used to remove the old filling material and to clean and shape all root canals, under magnification using the dental operating microscope (Opmi Pico, Carl Zeiss, Oberkochen, Germany). The endodontic space was filled with thermoplasticized gutta-percha in the continuous wave of condensation technique using System B and Obtura II (Sybron Endo, Orange, CA). Postoperative control radiographs from different angles were taken to confirm the quality of the performed treatment. Key Words: endodontic anatomy, retreatment, molar, root canal therapy INTRODUCTION Good knowledge of the endodontic anatomy and its variations from normal are the first requirements when performing root canal therapy. An unshaped and unfilled root canal will lead to failure of the endodontic therapy in a very short time. 1 1 Department of Restorative Dentistry and Endodontics, 2 Department of Periodontology, Faculty of Dental Medicine, Victor Babes University of Medicine and Pharmacy, Timisoara Correspondence to: Luminita Maria Nica, Department of Endodontics, Faculty of Dental Medicine Timisoara, 9 Revolutiei 1989 Blvd., , Timisoara, Tel nical78@yahoo.com Received for publication: Oct. 25, Revised: Mar. 28, The mandibular first molar is the first permanent posterior tooth to erupt on the dental arch. Because of its high rate of caries is often involved in endodontic therapy. It usually has two roots but occasionally three, with two canals in the mesial root and one or two canals in the distal root. 2,3 Cleaning and shaping of this tooth can be complicated by the presence of the third root canal in the mesial or in the distal root. 4-6 Skidmore & Bjorndal reported in 1971 that approximately one third of the mandibular first molars studied had four root canals. 7 Molars with five root canals were also reported. In these cases, three mesial or three distal canals were described The third mesial canal in human lowers first molars, also known as the middle mesial canal (MM), has an incidence varying from 1% to 15% This supplementary canal is very hard to be detected without proper illumination and magnification, so the use of the dental operating microscope in exploring the pulp chamber floor is absolutely necessary. 18 When it s Camil-Ioan Ianes et al 125
2 present, the MM canal is found in the developmental groove between the mesiobuccal and the mesiolingual canals Ultrasonic tips are very useful in removing the dentin which overlays on this groove and limits the visibility and the access to this canal. This case report describes the orthograde endodontic retreatment performed on a first mandibular molar with five root canals, two distals and three mesials, situated in two roots, diagnosed with chronical apical periodontitis. This status resulted as a consequence of the failure of the first endodontic treatment performed, where the second distal and the third mesial (MM) canals were undetected and untreated. CASE REPORT A 30-years-old female patient was referred by a general practitioner (GP) for endodontic orthograde retreatment on tooth no. 46. Two preoperative angulated periapical radiographs were taken and examined before initiating any endodontic treatment. The X-Rays confirmed that the patient had a deficient previous root canal treatment on the first mandibular right molar, with incomplete root canal fillings on both mesial and distal roots, with chronic apical periodontitis, but with no clinical significant simptomatology. (Fig. 1) At a careful examination of the preoperative periapical X-rays, the distal root seemed to have two root canals. Also, the shape and size of the mesial root on the X-rays and that of the root canals fillings former performed, suggested that this root could also have a supplementary, untreated root canal. The patient was informed about the procedure to be done and an informed consent has been signed. Figure 1. Pre-operative X-ray of the tooth 46. Note the periapical resorbtion on both of the roots, the improper root canals fillings, and the interesting morphology of the mesial root. Figure 2. Clinical aspect of the tooth isolated with rubber dam. A massive composite restoration with infiltration and secondary caries was observed. First appointment - the retreatment After local anaesthesia (local nerve-block) with articaine (Ubistesin forte, 3M Espe, Seefeld, Germany) the tooth no. 46 was isolated with rubber dam and clamp (Hygenic, Coltene Whaledent, USA). (Fig. 2) The access cavity was initiated with a round high speed diamond bur no. 4 (Dentsply Maillefer, Ballaigues, Switzerland), under the DOM (Opmi Pico, Carl Zeiss, Oberkochen, Germany), at a lower magnification. An Endo Access bur number A0164 (Dentsply Maillefer, Switzerland) and ultrasonic tips (CPR, Dentsply Maillefer, Switzerland) were used to refine the access cavity and to remove all the caries and the former composite coronal restoration material. When exposing the pulp chamber floor, a lot of debris, sealer and gutta-percha were observed. The pulp chamber was thoroughly rinsed with heated sodium hypochlorite (Chloraxid 5.25%, Cerkamed, Poland) and the pulpal floor was carefully examined under higher magnification with DOM using an endodontic probe (DG16, Hu Friedy, US), and afterwards with size 010 Micro-Opener instruments (Dentsply Maillefer, Switzerland). In both roots, the canal fillings were former performed with gutta-percha and sealer, with the appearance of two master cones in the mesial root (one mesiobuccal and one mesiolingual), and one in the distal root. (Fig. 3) When exploring this area with a size 10 stainless steel K-files (VDW, Munich, Germany) attached to an apex locator (EIE/Analytic Technology, Orange, CA, USA), the presence of the second distal canal, the distolingual, was confirmed. This canal was undetected and unshaped by the GP. Gutta-percha from the distobuccal, mesiobuccal and mesiolingual canal was removed with ProTaper Universal System (Dentsply Maillefer, Ballaigues, Switzerland) rotary instruments for retreatment, 126 TMJ 2011, Vol. 61, No. 1-2
3 Figure 3. The aspect after removing the former coronal restoration and refining the access cavity. The pulp chamber and the root canals are full of filling materials and debris. without using solvents. These nickel-titanium rotary instruments were used in a crown-down manner in combination with a torque-controlled engine (X-Smart TM Endodontic Motor, Dentsply, UK) at 500 rpm, according to the manufacturer s instructions. The root-filling material was gradually removed using light apical pressure, until the working length was reached with D3 size 20 instrument, 7% taper. The D1 instrument (9% taper, size 30) was first used to create a pilot hole into the filling material; then the D2 instrument (8% taper, size 25) was used in the middle third of the root canal and the D3 in the apical part of it. The working length was confirmed by electronic measurement with an apex locator (EIE/ Analytic Technology, Orange, CA, USA) and stainlesssteel K-files. Apical enlargement was then performed with ProTaper Universal instruments F1-F4, until instrument F4 (size 40, 6% taper) nearly reached the working length in the distal canal and instrument F3 (size 30, 9% taper) in the mesiobuccal and mesiolingual canals. Preparation was deemed complete when there was no filling material covering the instruments. The distolingual canal was shaped to an F4, after negotiating it with size 08 stainless steel K-files (VDW, Munich, Germany) and enlarging it by hand, using stainless-steel K-files, untill instrument size 25 reached the entire working length. The preparation continued with ProTaper Universal rotary instruments S1-S2 and the finishing was made with F1-F4 according to manufacturer s instructions. One set of ProTaper Universal for retreatment and one set of ProTaper rotary for treatment were used for all four root canals. Root canals were intermittently and copiously irrigated with 5 ml of heated NaOCl 5.25% after each instrument change. Irrigation with NaOCl alternated with 17% EDTA solution during and after the Figure 4. After performing the endodontic retreatment on the distal and mesial canals, a careful examination of the groove between the mesiobuccal and the mesiolingual canal was performed. instrumentation, to remove the smear layer. Patency was assured on each of the root canals with the K-file no 10 (VDW, Munich, Germany). After completing cleaning and shaping of these four root canals, careful examination of the mesial root under higher magnification with the DOM was performed. (Fig. 4) A 08 K- file could be inserted on the isthmus between the mesiobuccal and mesiolingual canal, confirming the presence of the middle mesial (MM) canal in the mesial root. (Fig. 5) The dentin covering this root canal was removed using ultrasonic tips (CPR, Dentsply Maillefer, Switzerland) in order to insure straight line access. The negotiation started with a size 08 stainless steel K-file (VDW, Munich, Germany), in the presence of a viscous chelating agent placed on the file (Glyde File Prep, Dentsply Maillefer, Ballaigues, Switzerland) till it reached the working length, which was confirmed by electronic measurement with an apex locator (EIE/Analytic Technology). The middle mesial canal was shaped to a F2 ProTaper rotary (size 25, 8% taper). Figure. 5 The detection of the middle mesial canal, after removing the dentin that covers it, with a K-file size 08. Camil-Ioan Ianes et al 127
4 Final irrigation with sodium hypochlorite, sterile saline and chlorhexidine solution 2% for 10 min in each root canal was performed. The canals were dried with sterile paper points and an interim dressing of calcium hydroxide and 1% chlorhexidine was placed as medication in each root canal for 2 weeks. Second appointment - the root canals filling In the second appointment, the calcium hydroxide dressing was removed, the canals were rinsed, and each of the five canals was gauged using NiTi hand K-files attached to an apex locator in the presence of an irrigant (EDTA 17% solution). The diameters of the apical foramens (and respectively that of the master gutta-percha cones) were established at size 40 for the distal canals, 35 for the mesiobuccal and mesiolingual canals, and 25 for the middle mesial canal. Apical finishing of all root canals was obtained by using hand stainless steel K-files in a step-back sequence. (Fig. 6) The canals were irrigated again, dried with sterile paper points and the gutta-percha master cones (size 40, 10% taper for the distal canals, size 35, 6% taper for mesiobuccal and mesiolingual canals, and size 25, 6% taper for MM) were cut to fit at 0.5 mm of the working length for each root canal. Each selected master cone was then cemented into the corresponding root canal with AH Plus sealer (Dentsply Maillefer, Ballaigues, Switzerland). (Fig. 7) The master cones were shortened to the root canal orifice with the tip of a heated System B plugger (SybronEndo Corporation, Orange, CA, USA) attached to the System B heat source (SybronEndo) set at 200ºC and full power mode. The technique used for obturation was the continuous wave of condensation. 22 After down-packing the gutta-percha master points with System B pluggers (SybronEndo), the phase of back-packing was completed with thermo-plasticized gutta-percha using the Obtura II gun (Obtura Spartan, Figure 7. Fitting the gutta-percha master cones on each of the root canals. Fenton, MO, USA) (Fig. 8). The pulp chamber was temporary sealed with glass ionomer cement and angled radiographs were taken to evaluate the quality of the performed endodontic treatment. (Fig. 9) DISCUSSION Although with a lower frequency, this case report describes the retreatment performed on a first mandibular molar with five root canals, two in the distal root and three in the mesial one. Several studies investigated the anatomy of mandibular first molars, so today is not unusual to discuss about supplementary canals in the distal or mesial root of these teeth, or even about more than two roots. The middle mesial canal is considered to be present in the mesial root in up to 15% of the cases reported. 17 Rarely, three canals may be found in the distal root In the present case report, the endodontic retreatment was necessary because of the presence of apical periodontitis, as a consequence of an improper former root canal therapy performed several years ago. Cases of retreatment always begin with a careful examination Figure 6. Clinical aspect of the five detected root canals cleaned-shaped and ready to be filled. Figure 8. Clinical aspect of all five root canals after back-filling with thermoplasticized gutta-percha. 128 TMJ 2011, Vol. 61, No. 1-2
5 improper cleaning-shaping-obturation will lead to endodontic failure, which sooner or later will consist in an apical periodontitis. Good knowledge of the endodontic anatomy and of its variations, careful interpretation of preoperative periapical X-rays, magnification and illumination under the DOM, improve the predictability and the long term success of root canal treatment and retreatment. REFERENCES Figure. 9 Post-operative control radiograph of tooth 46. of the endodontic morphology of the involved tooth on preoperative radiographs, because many times the failure of the first performed therapy is caused by a missed and untreated root canal. The X-rays may reveal a special endodontic anatomy of the treated tooth. Endodontic retreatment is much more difficult than primary root canal treatment because of the presence in the root canal of filling materials, broken instruments or even ledges that sometimes make the renegotiation of the root canal impossible on its entire working length. 23,24 Although a lot of solvents can be used to remove the filling materials from the endodontic space, in this case only ProTaper Universal rotary instruments for retreatment were used, under copious irrigation with sodium hypochlorite and EDTA solution. Finishing of the root canals preparation was realised to the desired taper and apical diameter by using ProTaper rotaries and K-hand files. The retreatment was performed in this case in two appointments only because of the complexity of the endodontic anatomy, which necessitated more time for instrumentation of the five root canals, so the working time was prolonged beyond patient s tolerance. Between the two appointments, calcium hydroxide/ 1% chlorhexidine was placed as medication in the root canals for two weeks, in order to enable the life of microorganisms un-destroyed by the irrigation protocol 25. In teeth with uncomplicated root canal anatomy, when the diagnosis is chronic apical periodontitis and teeth have no clinical simptomatology endodontic retreatment can be performed in one appointment, as single visit endodontics. CONCLUSIONS Long term success of endodontic therapy depends on identifying, cleaning and shaping of all root canals, in order to ensure a tridimensional filling of the entire endodontic anatomy. Missing a supplementary canal, 1. Ingle IJ. Endodontics, pp Philadelphia: Lea & Febiger, Burns RC, Buchanan LS. Tooth morphology and access openings. In Cohen S, Burns RC (eds). Pathways of the pulp, 6 th Ed. pp St. Louis: Mosby, Gulabivala K, Aung TH, Alavi A, et al. Root and canal morphology of Burmese mandibular molars. I Endod J 2001;34: Vertucci FJ. Root canal anatomy of the human permanent teeth. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 1984;58: Vertucci FJ. Root canal morphology and its relationship to endodontic procedures. Endod Topics 2005;10: Peiris HRD, Pitakotuwage TN, Takahashi M, et al. Root canal morphology of mandibular permanent molars at different ages. Int Endod J 2008;41: Skidmore AE, Bjorndal AM. Root canal morphology of the human mandibular first molar. Oral Surg 1971;32: Goel NK, Gill S, Taneja JR. Study of root canals configuration in mandibular first permanent molar. J Ind Soc Pedod Prev Dent 1991;8: DeGrood ME, Cunningham CJ. Mandibular molar with 5 canals: report of a case. J Endod 1997;23: Kimura Y, Matsumoto K. Mandibular first molar with three distal root canals. Int Endod J 2000;33: Barletta FB, Dotto RS, de Sousa-Reis M, et al. Mandibular molar with five root canals. Aust Endod J 2008;34: Kottor J, Sudha R, Velmurugan N. Middle distal canal of the mandibular first molar: a case report and literature review. Int Endod J 2010;43: Jacobsen EL, Dick K, Bodell R. Mandibular first molars with multiple mesial canals. J Endod 1994;20: Holtzmann L. Root canal treatment of a mandibular molar with three mesial root canals. Int Endod J 1997;30: Baugh D, Wallace J. Middle mesial canal of the mandibular first molar: a case report and literature review. J Endod 2004;30: Navarro LF, Luzi A, Garcia AA, et al. Third canal in the mesial root of the permanent mandibular first molars: Review of the literature and presentation of 3 clinical reports and 2 in vitro studies. Med Oral Patol Oral Cir Buc 2007;12: Cohen S, Hargreaves MK (editors). Pathways of the pulp, 9 th ed. pp St. Louis: Mosby, Karapinar-Kazandag M, Basrani BR, Friedman S. The operating microscope enhances detection and negotiation of accessory mesial canals in mandibular molars. J Endod 2010;36: Teixera FB, Sano CL, Gomes BP, et al. A preliminary in vitro study of the incidence and position of the root canal isthmus in maxillary and mandibular first molars. Int Endod J 2003;36: Faramazi F, Fakri H, Javaheri HH. Endodontic treatment of a mandibular first molar with three mesial canals and broken instrument removal. Aust Endod J 2009;36: Camil-Ioan Ianes et al 129
6 21. Huang RY, Cheng WC, Chen CJ, et al. Three-dimensional analysis of the root morphology of mandibular first molars with distolingual roots. Int Endod J 2010;43: Buchanan LS. The continuous wave of condensation: centered condensation of gutta-percha in 12 seconds. Dent Today 1996;15: Stabholz A, Friedman S. Endodontic retreatment-case selection and technique. Part 2: treatment planning for retreatment. J Endod 1988;14: Friedman S, Stabholz A, Tamse A. Endodontic retreatmentcase selection and technique. Part 3: retreatment techniques. J Endod 1990;16: DeRossi A, Silva LA, Leonardo MR et al. Effect of rotary or manual instrumentation, with or without calcium hydroxide/1% chlorhexidine intracanal dressing, on the healing of experimentally induced chronic periapical lesions. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2005;99: TMJ 2011, Vol. 61, No. 1-2
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