Saudi Endodontic Journal

: 2019  |  Volume : 9  |  Issue : 2  |  Page : 140--143

Endodontic management of mandibular anterior teeth with two root canals

Mohammed S Alenazy1, Shatha Sulaiman Alrushoud2, Abdulrahman Almasoud3, Omar Al-Dayel4,  
1 Ministry of Health, King Khalid Hospital, Alkharj, Saudi Arabia
2 Prince Abdulrahman Advanced Dental Institute, Riyadh, Saudi Arabia
3 Prince Sultan Military Medical City, Riyadh, Saudi Arabia
4 Consultant in Restorative Dentistry, Prince Abdulrahman Advanced Dental Institute, Riyadh, Saudi Arabia

Correspondence Address:
Dr. Mohammed S Alenazy
Ministry of Health, King Khalid Hospital, P.O. Box 21437, Riyadh 11475
Saudi Arabia


Teeth with single root canals are considered to be the simplest for endodontic treatment. In the literature, the internal and external root canal anatomy of mandibular incisors and canines could present with a number of variations including extra canals. This case report illustrates the detection and successful nonsurgical endodontic retreatment of root canal systems in all mandibular incisors and canines in one patient.

How to cite this article:
Alenazy MS, Alrushoud SS, Almasoud A, Al-Dayel O. Endodontic management of mandibular anterior teeth with two root canals.Saudi Endod J 2019;9:140-143

How to cite this URL:
Alenazy MS, Alrushoud SS, Almasoud A, Al-Dayel O. Endodontic management of mandibular anterior teeth with two root canals. Saudi Endod J [serial online] 2019 [cited 2020 Jul 2 ];9:140-143
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Full Text


The main core of endodontic treatment is achieved by reaching an adequate chemomechanical debridement and filling the entire canal space in three-dimensional manner.[1] Failure to locate all root canals may lead to several complications such as posttreatment disease.[2] Therefore, a sound knowledge of root canal morphology is essential for the successful outcome of root canal therapy. Several studies had been conducted on the root canal internal anatomy mandibular anterior teeth. The incidence of two canals on mandibular incisors was 12%–41.4%,[3],[4],[5],[6],[7] while in mandibular canines, two canals range from 4.1% to 24%.[8],[9],[10],[11] The two canals may merge into one at the apical third or in rare cases split into two.

The purpose of this case report describes the clinical endodontic management of all mandibular incisors and canines, each with two canals of varied configurations in one patient.

 Case Report

A 34-year-old Saudi female with no history of any systemic diseases was referred to the Department of Endodontics of Prince Abdulrahman Advanced Dental Institute for endodontic treatment of her mandibular incisors and canines (#33–43). The patient was prepared for prosthetic rehabilitation and his dentist needs to evaluate the endodontic treatment of his mandibular anterior teeth. The patient had no symptoms, and the root canal treatment was done long time ago. The percussion and palpation testes were applied for all teeth and the response was negative, and mobility was normal. All radiographic images with different angulations had been evaluated and showed inadequate root canal filling and periapical radiolucency at teeth #33–43 [Figure 1]. Based on the clinical and radiographic examinations, the diagnosed teeth were previously treated with asymptomatic apical periodontitis. A plan of nonsurgical root canal retreatment was decided accordingly.{Figure 1}

All coronal restorations were removed. Then, the local anesthesia with 2% lidocaine and 1:100,000 epinephrine was established and the rubber dam was placed. A careful examination of the pulp chambers under dental operating microscope (Möller-Wedel International Microscopes, Germany) revealed two separated labial and lingual orifices in #33–43 teeth. The root canal filling was removed with chloroform and ProTaper retreatment rotary files (DENTSPLY Maillefer, Ballaigues, Switzerland), access cavity was closed, then rubber dam was removed, and a multiplanar reconstruction cone-beam computed tomography (CBCT) was taken to confirm the numbers and canal configuration of the mandibular incisors and canines' teeth (#33–43). The images of CBCT were obtained with Planmeca ProMax 3D Max CBCT (Planmeca OY, Helsinki, Finland) and showed the general configuration of the mandibular incisors and canines as follow: teeth #33, 32, 42, and 43 were Type III (1-2-1), tooth #41 Type IV (2-2), and tooth # 31 Type V (1-2) according to Vertucci's classification [Figure 2] and [Figure 3].[11] Rubber dam was placed, and the outline of access cavity was adjusted to establish straight-line access for all canals. The working length was re-established with Root ZX II (J. Morita, Tokyo, Japan) and confirmed radiographically.{Figure 2}{Figure 3}

The instrumentation was done with ProTaper universal files (DENTSPLY Maillefer, Ballaigues, Switzerland) to size F2 using copious irrigation with 5.25% sodium hypochlorite. Then, the canals were dried with sterile paper points and filled with gutta-percha and Endosequence BC sealer (Root Sealer Material, Brasseler, USA) in a lateral compaction manner. Finally, the access cavity was closed with Cavit (Dent-a-Cav, Barmstedt, Germany) and resin-modified glass ionomer filling (ChemFil, DENTSPLY DeTrey, Germany) [Figure 4]. The patient was referred back to the department of prosthodontics to fabricate for final restorations.{Figure 4}

The follow-up posttreatment radiographs after 12 months showed a complete reduction of the periapical radiolucency for all treated teeth [Figure 5] with no clinical signs and symptoms.{Figure 5}


An adequate root canal therapy requires sufficient biomechanical instrumentation and obturating the entire canal space in three-dimensional perspectives. The main reason of endodontic treatment failure is missed canals due to ignorance or neglect of the internal anatomy of the teeth.[1],[2] This case report described nonsurgical root canal retreatments of mandibular anterior teeth each with two canals which were missed during the previous treatment. Therefore, every effort should be made by the clinician to diagnose and treat such teeth through using appropriate available armamentaria.

Some investigators recommend exposing several angulated periapical radiographs for detecting teeth the morphological variation.[12],[13] Root sectioning, staining, and clearing techniques have been used. The use of CBCT images is very useful technology in detecting the dental morphological variation.[14] It was used in the current case to identify the potential suspected accessory canals of the treated teeth.

The proper preparation and design of teeth access cavity is the utmost importance to visualize and detect the whole pulp-chamber floors. Therefore, the access cavities of the affected teeth were modified under dental operating microscope. In this case, the outline was extended more lingually to manage the lingual missed canals. In addition, a detailed examination of the pulp-chamber floors under the proper magnification and illumination increased the possibility of detecting and treating the entire pulp and canal system.[15],[16]

The occurrence of two canals in mandibular incisor has been reported in a Saudi subpopulation by Al-Fouzan et al.[17] They found that 70% of the samples had one canal, while the reaming had two. The two canal configurations were of Type III, which is similar most of the teeth of this case.

Endodontic treatments of mandibular canine have been described in Saudi population as case reports.[18],[19],[20] This report showed the occurrence of two canals in both canines of the same patient in different configuration forms.

The new bioceramic endodontic materials are totally not sensitive to both moisture and blood contaminations and hence are not technique sensitive.[21],[22],[23] With their antimicrobial and the high sealability properties, endodontic premixed bioceramic materials could contribute a critical role in endodontic treatment success.[24] In addition, number of investigators noted that bioceramic sealers have a high potential for promoting bone regeneration in case of unintentionally extruded sealer materials apically.[22],[25]

The process of healing appears subsequently in periapical lesions in case of adequate biomechanical preparation and filling of the entire root canal space.[26] Several studies revealed that healing takes place within 12 months, while others found that this reaction may take several years.[27] However, in certain cases, periapical lesions could heal with scar tissue.[28] Although the outcome of nonsurgical retreatment success is lower than the treatment,[29] in the present case, a complete healing of periapical lesions was observed within the 1st year.


The clinician should always pay enough attention to all endodontic treated cases. Utilization of operation, dental microscope, CBCT, and additionally selected appropriate obturation materials will assure a successful outcome.

Declaration of patient consent

The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.

Financial support and sponsorship


Conflicts of interest

There are no conflicts of interest.


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