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:: Volume 31, Issue 1 (winter 2013) ::
J Dent Sch GYEAR__, 31(1): 8-14 Back to browse issues page
Topographic Evaluation of Apex and Root Canal of Maxillary Premolars in an Iranian Population
Mandana Nasseri Dr., Mozhgan Momayyez Dr., Zohreh Ahangari Corresponding Author: Dr. *
Associate Professor Dept. of Endodontics , zohrehahangari@dent.sbmu.ac.ir
Abstract:   (3622 Views)

Objective: Knowledge about the internal anatomy of the root canal and apical foramen is a critical prerequisite for root canal therapy and is necessary for the success of endodontic treatment. This study aimed to determine the distance of apical foramen from the anatomical apex and apical constriction, evaluate the deviation of apical foramen from the anatomical apex and specify the most common canal types in maxillary premolar teeth using stereomicroscope.

Methods: In this laboratory experimental study, 100 extracted first and second maxillary premolars of patients presenting to dental clinics in Tehran were selected. After the disinfection of roots and access cavity preparation, apical foramen deviation and its distance from the anatomical apex were determined by introducing a #10 hand file into the canal and observation under stereomicroscope 2% methylene blue was then injected into the canals and demineralization and clearing process were carried out to measure the distance of apical foramen from the apical constriction and evaluate the canal type.

Results: The mean distance of apical foramen from the anatomical apex and apical constriction was 0.4-0.5 and 0.5-0.7 mm, respectively in maxillary first premolars and 0.3-0.7 and 0.6-1 mm, respectively in maxillary second premolars. In less than 17% of first premolars and 37% of second premolars, the canal followed a straight path to the anatomical apex without any deviation towards the mesiodistal or buccolingual directions. The most common canal type according to Vertucci’s classification was type IV in the first and type I in the second premolars. In general, 94% (n=47) of the first premolars and 46% (n=23) of the second premolars had 2 canals while the remaining teeth had a single canal.

Conclusion: This study showed that the apical foramen in premolar teeth is located at a 0.3-0.7 mm distance from the anatomical apex and 0.5-1 mm distance from the apical constriction. In more than 83% of first premolars and 63% of second premolars the apical foramen did not correspond to the anatomical apex. First and second premolars had 2 canals in 94% and 46% of cases, respectively.

Keywords: Anatomical apex, Canal deviation, Premolar, Apical constriction, Clearing process, Apical foramen, Canal type
Full-Text [PDF 278 kb]   (995 Downloads)    
Type of Study: Original Article | Subject: Special
Received: 2013/05/18 | Accepted: 2013/09/25 | Published: 2013/09/25
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Nasseri M, Momayyez M, Ahangari Z. Topographic Evaluation of Apex and Root Canal of Maxillary Premolars in an Iranian Population. J Dent Sch. 2013; 31 (1) :8-14
URL: http://jds.sbmu.ac.ir/article-1-1107-en.html
Volume 31, Issue 1 (winter 2013) Back to browse issues page
مجله دانشکده دندانپزشکی دانشگاه علوم پزشکی شهید بهشتی Shahid Beheshti University Dental Journal
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