|Year : 2015 | Volume
| Issue : 3 | Page : 187-190
Root canal treatment of three-rooted mandibular second premolar using cone-beam computed tomography
Mohammad Ahmad Alenezi1, Mohammad Abdullah Tarish1, Deena J Alenezi2
1 Department of Restorative Dentistry, College of Dentistry, Riyadh Colleges of Dentistry and Pharmacy, Riyadh, Kingdom of Saudi Arabia
2 Diploma in Endodontics, Capital Heath Region, Ministry of Health, Kuwait
|Date of Web Publication||26-Aug-2015|
Mohammad Ahmad Alenezi
Department of Restorative Dentistry, College of Dentistry, Riyadh Colleges of Dentistry and Pharmacy, Postal box 84891 Riyadh-11681
Kingdom of Saudi Arabia
Source of Support: Nil., Conflict of Interest: None
A careful knowledge of root canals anatomy of different teeth is a corner stone for a successful outcome of root canal therapy. This reported case illustrates root canal therapy of a mandibular second premolar with three separated roots and root canals. An 18-year-old Saudi male presented for non-surgical endodontic treatment of mandibular right second premolar. Radiographic and clinical examinations revealed the presence of three roots and three root canals. The case was successfully managed with the help of cone-beam computed tomography (CBCT). In conclusion, the clinicians should always suspect the event of anatomical varieties and use all the available tools to diagnose and manage their cases.
Keywords: Anatomic variations, cone-beam computed tomography, mandibular second premolar, root canal treatment
|How to cite this article:|
Alenezi MA, Tarish MA, Alenezi DJ. Root canal treatment of three-rooted mandibular second premolar using cone-beam computed tomography. Saudi Endod J 2015;5:187-90
|How to cite this URL:|
Alenezi MA, Tarish MA, Alenezi DJ. Root canal treatment of three-rooted mandibular second premolar using cone-beam computed tomography. Saudi Endod J [serial online] 2015 [cited 2019 Nov 14];5:187-90. Available from: http://www.saudiendodj.com/text.asp?2015/5/3/187/163621
| Introduction|| |
The main aim of root canal therapy is to perform proper cleaning and shaping as well as filling the entire root canal system. Failure to do that may lead to post-treatment disease and complications., Therefore; the clinicians should have a sound knowledge of internal and external teeth morphology and their frequent variations to improve the predictability of root canal therapy.
Mandibular premolar is the most difficult tooth for endodontic therapy because of its complicated root canals morphology. Several studies have correlated gender and ethnicity with anatomic variations and complexity of the root canal system in mandibular second premolars. Serman and Hasselgren found that males have higher prevalence number of roots and root canals in mandibular premolars than females.
The root canals morphology of the mandibular second premolar has been studied by different ways.,, Premolars may show a variation in their roots numbers, the percentage of mandibular second premolars having three roots approximately 0.1%.
| Case Report|| |
An 18-years-old Saudi male with no history of any systemic diseases presented for endodontic treatment of his mandibular right second premolar tooth (#45). The patient was referred to the Department of Endodontics; Riyadh Colleges of Dentistry and Pharmacy, Riyadh, Saudi Arabia with a chief complaint of seeking continuation of treatment mandibular right second premolar tooth. (#45). Radiographic evaluation revealed normal periodontium and presence of more than one root [Figure 1]. Based on the clinical and radiographic examinations, the tooth was diagnosed as having a previously initiated pulp with normal periapical tissues.
|Figure 1: preoperative radiograph tooth #45 (white arrows denote three roots)|
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Cone-beam computed tomography (CBCT) was carried out for confirming numbers of roots and canals of mandibular right second premolar. The CBCT images were taken out using three-dimensional (3D) Accuitomo scanner (J. Morita, Kyoto, Japan), with Viewer Plus software (J. Morita), which produced a smallest field of view images, to reduce the radiation dosage. A three roots with three canals were found, two roots buccally and one root lingually [Figure 2]. A non-surgical root canal treatment was planned accordingly.
|Figure 2: The axil plane of CBCT of #45 showing three roots and three canals.|
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The patient received local anesthesia with 2% lidocaine and 1:100,000 epinephrine and the rubber dam placement. Following the removal of temporary filling, careful examination of the pulpal floor under dental operating microscope (Global Dental Microscopes, Global Surgical Corporation, U.S.A) revealed three separate mesiobuccal, distobuccal and lingual orifices. The access cavity outline was modified into triangular shape to establish straight-line access for all root canals. The working length was established using Root ZX II (J. Morita, Tokyo, Japan) and confirmed radiographically [Figure 3]. Instrumentation is achieved with ProTaper universal files (Dentsply, Maillefer, Ballaigues, Switzerland) to size F2, copious irrigation with 2.5% NaOCl and 17% EDTA was carried out during the instrumentation phase. All canals were dried with sterile paper points and then filling using matching gutta-percha cones and AH-plus sealer (Dentsply Maillefer, Ballaigues, Switzerland) until canal orifices and then the pulp chamber was filled using Obtura III (Max System, Obtura Spartan U.S.A). Finally, the access cavity was filled with Fuji resin-modified glass ionomer filling (ChemFil, Dentsply Detrey, Germany) [Figure 4] and the patient was referred to prosthodontic clinic to fabricate a full coverage crown.
| Discussion|| |
Proper endodontic therapy requires adequate biomechanical instrumentation and 3D filling of the entire root canal space. Missed canals are recognized as a main reason for failure of root canal therapy., Mandibular second premolar is one the most difficult teeth for endodontic therapy because its root canal morphology is complicated. Previous case reports of mandibular second premolars having three roots,,,,,,,, presented in [Table 1].
|Table 1: Previous case reports of mandibular second premolars having three roots|
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Careful interpretation of diagnostic periapical radiographs taken at more than one angle is important to detect teeth morphological variations., Advanced radiographic methods such as CBCT are very helpful to diagnose morphological variations if conventional radiographic techniques provide limited information and more details are required. CBCT is advanced practical tool for non-invasive and 3D reconstruction imaging and it is more accurate diagnostic tool for effective assessment of root canal morphology.
Furthermore, use of magnification with the help of a loupe or a microscope and visual enhancement with the use of fiber optics, sodium hypochlorite bubble technique and staining with 1% methylene blue dye might help to locate additional root canals.
| Conclusion|| |
Although the probability of having three roots in mandibular second premolars is rare, this variation should be considered while treating these teeth to improve root canal treatment outcome. A preoperative radiographs, correct access cavity outline and proper inspection of pulpal floor are important to diagnose and treat teeth of anatomical variations. In addition, CBCT the dental operating microscope are recommended to use to perform better endodontic treatment.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4]